+++ /dev/null
-/* vi: set sw=4 ts=4: */
-/*
- * lash -- the BusyBox Lame-Ass SHell
- *
- * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
- *
- * Based in part on ladsh.c by Michael K. Johnson and Erik W. Troan, which is
- * under the following liberal license: "We have placed this source code in the
- * public domain. Use it in any project, free or commercial."
- *
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
- */
-
-/* This shell's parsing engine is officially at a dead-end. Future
- * work shell work should be done using hush, msh, or ash. This is
- * still a very useful, small shell -- it just don't need any more
- * features beyond what it already has...
- */
-
-//For debugging/development on the shell only...
-//#define DEBUG_SHELL
-
-#include <getopt.h>
-#include <glob.h>
-
-#include "libbb.h"
-
-#define expand_t glob_t
-
-/* Always enable for the moment... */
-#define CONFIG_LASH_PIPE_N_REDIRECTS
-#define CONFIG_LASH_JOB_CONTROL
-#define ENABLE_LASH_PIPE_N_REDIRECTS 1
-#define ENABLE_LASH_JOB_CONTROL 1
-
-
-enum { MAX_READ = 128 }; /* size of input buffer for 'read' builtin */
-#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
-
-
-#if ENABLE_LASH_PIPE_N_REDIRECTS
-enum redir_type { REDIRECT_INPUT, REDIRECT_OVERWRITE,
- REDIRECT_APPEND
-};
-#endif
-
-enum {
- DEFAULT_CONTEXT = 0x1,
- IF_TRUE_CONTEXT = 0x2,
- IF_FALSE_CONTEXT = 0x4,
- THEN_EXP_CONTEXT = 0x8,
- ELSE_EXP_CONTEXT = 0x10
-};
-
-#define LASH_OPT_DONE (1)
-#define LASH_OPT_SAW_QUOTE (2)
-
-#if ENABLE_LASH_PIPE_N_REDIRECTS
-struct redir_struct {
- enum redir_type type; /* type of redirection */
- int fd; /* file descriptor being redirected */
- char *filename; /* file to redirect fd to */
-};
-#endif
-
-struct child_prog {
- pid_t pid; /* 0 if exited */
- char **argv; /* program name and arguments */
- int num_redirects; /* elements in redirection array */
- int is_stopped; /* is the program currently running? */
- struct job *family; /* pointer back to the child's parent job */
-#if ENABLE_LASH_PIPE_N_REDIRECTS
- struct redir_struct *redirects; /* I/O redirects */
-#endif
-};
-
-struct jobset {
- struct job *head; /* head of list of running jobs */
- struct job *fg; /* current foreground job */
-};
-
-struct job {
- int jobid; /* job number */
- int num_progs; /* total number of programs in job */
- int running_progs; /* number of programs running */
- char *text; /* name of job */
- char *cmdbuf; /* buffer various argv's point into */
- pid_t pgrp; /* process group ID for the job */
- struct child_prog *progs; /* array of programs in job */
- struct job *next; /* to track background commands */
- int stopped_progs; /* number of programs alive, but stopped */
- unsigned int job_context; /* bitmask defining current context */
- struct jobset *job_list;
-};
-
-struct built_in_command {
- const char *cmd; /* name */
- const char *descr; /* description */
- int (*function) (struct child_prog *); /* function ptr */
-};
-
-/* function prototypes for builtins */
-static int builtin_cd(struct child_prog *cmd);
-static int builtin_exec(struct child_prog *cmd);
-static int builtin_exit(struct child_prog *cmd);
-static int builtin_fg_bg(struct child_prog *cmd);
-static int builtin_help(struct child_prog *cmd);
-static int builtin_jobs(struct child_prog *dummy);
-static int builtin_pwd(struct child_prog *dummy);
-static int builtin_export(struct child_prog *cmd);
-static int builtin_source(struct child_prog *cmd);
-static int builtin_unset(struct child_prog *cmd);
-static int builtin_read(struct child_prog *cmd);
-
-
-/* function prototypes for shell stuff */
-static void checkjobs(struct jobset *job_list);
-static void remove_job(struct jobset *j_list, struct job *job);
-static int get_command_bufsiz(FILE *source, char *command);
-static int parse_command(char **command_ptr, struct job *job, int *inbg);
-static int run_command(struct job *newjob, int inbg, int outpipe[2]);
-static int pseudo_exec(struct child_prog *cmd) NORETURN;
-static int busy_loop(FILE *input);
-
-
-/* Table of built-in functions (these are non-forking builtins, meaning they
- * can change global variables in the parent shell process but they will not
- * work with pipes and redirects; 'unset foo | whatever' will not work) */
-static const struct built_in_command bltins[] = {
- {"bg" , "Resume a job in the background", builtin_fg_bg},
- {"cd" , "Change working directory", builtin_cd},
- {"exec" , "Exec command, replacing this shell with the exec'd process", builtin_exec},
- {"exit" , "Exit from shell()", builtin_exit},
- {"fg" , "Bring job into the foreground", builtin_fg_bg},
- {"jobs" , "Lists the active jobs", builtin_jobs},
- {"export", "Set environment variable", builtin_export},
- {"unset" , "Unset environment variable", builtin_unset},
- {"read" , "Input environment variable", builtin_read},
- {"." , "Source-in and run commands in a file", builtin_source},
- /* These were "forked applets", but distinction was nuked */
- /* Original comment retained: */
- /* Table of forking built-in functions (things that fork cannot change global
- * variables in the parent process, such as the current working directory) */
- {"pwd" , "Print current directory", builtin_pwd},
- {"help" , "List shell built-in commands", builtin_help},
- /* to do: add ulimit */
-};
-
-
-#define VEC_LAST(v) v[ARRAY_SIZE(v)-1]
-
-
-static int shell_context; /* Type prompt trigger (PS1 or PS2) */
-
-
-/* Globals that are static to this file */
-static char *cwd;
-static char *local_pending_command;
-static struct jobset job_list = { NULL, NULL };
-static int global_argc;
-static char **global_argv;
-static llist_t *close_me_list;
-static int last_return_code;
-static int last_bg_pid;
-static unsigned int last_jobid;
-static int shell_terminal;
-static const char *PS1;
-static const char *PS2 = "> ";
-
-
-#ifdef DEBUG_SHELL
-static inline void debug_printf(const char *format, ...)
-{
- va_list args;
- va_start(args, format);
- vfprintf(stderr, format, args);
- va_end(args);
-}
-#else
-static inline void debug_printf(const char UNUSED_PARAM *format, ...) { }
-#endif
-
-/*
- Most builtins need access to the struct child_prog that has
- their arguments, previously coded as cmd->progs[0]. That coding
- can exhibit a bug, if the builtin is not the first command in
- a pipeline: "echo foo | exec sort" will attempt to exec foo.
-
-builtin previous use notes
------- ----------------- ---------
-cd cmd->progs[0]
-exec cmd->progs[0] squashed bug: didn't look for applets or forking builtins
-exit cmd->progs[0]
-fg_bg cmd->progs[0], job_list->head, job_list->fg
-help 0
-jobs job_list->head
-pwd 0
-export cmd->progs[0]
-source cmd->progs[0]
-unset cmd->progs[0]
-read cmd->progs[0]
-
-I added "struct job *family;" to struct child_prog,
-and switched API to builtin_foo(struct child_prog *child);
-So cmd->text becomes child->family->text
- cmd->job_context becomes child->family->job_context
- cmd->progs[0] becomes *child
- job_list becomes child->family->job_list
- */
-
-
-static void update_cwd(void)
-{
- cwd = xrealloc_getcwd_or_warn(cwd);
- if (!cwd)
- cwd = xstrdup(bb_msg_unknown);
-}
-
-/* built-in 'cd <path>' handler */
-static int builtin_cd(struct child_prog *child)
-{
- char *newdir;
-
- if (child->argv[1] == NULL)
- newdir = getenv("HOME");
- else
- newdir = child->argv[1];
- if (chdir(newdir)) {
- bb_perror_msg("cd: %s", newdir);
- return EXIT_FAILURE;
- }
- update_cwd();
- return EXIT_SUCCESS;
-}
-
-/* built-in 'exec' handler */
-static int builtin_exec(struct child_prog *child)
-{
- if (child->argv[1] == NULL)
- return EXIT_SUCCESS; /* Really? */
- child->argv++;
- while (close_me_list)
- close((long)llist_pop(&close_me_list));
- pseudo_exec(child);
- /* never returns */
-}
-
-/* built-in 'exit' handler */
-static int builtin_exit(struct child_prog *child)
-{
- if (child->argv[1] == NULL)
- exit(EXIT_SUCCESS);
-
- exit(atoi(child->argv[1]));
-}
-
-/* built-in 'fg' and 'bg' handler */
-static int builtin_fg_bg(struct child_prog *child)
-{
- int i, jobnum;
- struct job *job;
-
- /* If they gave us no args, assume they want the last backgrounded task */
- if (!child->argv[1]) {
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->jobid == last_jobid) {
- goto found;
- }
- }
- bb_error_msg("%s: no current job", child->argv[0]);
- return EXIT_FAILURE;
- }
- if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
- bb_error_msg(bb_msg_invalid_arg, child->argv[1], child->argv[0]);
- return EXIT_FAILURE;
- }
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->jobid == jobnum) {
- goto found;
- }
- }
- bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
- return EXIT_FAILURE;
- found:
- if (*child->argv[0] == 'f') {
- /* Put the job into the foreground. */
- tcsetpgrp(shell_terminal, job->pgrp);
-
- child->family->job_list->fg = job;
- }
-
- /* Restart the processes in the job */
- for (i = 0; i < job->num_progs; i++)
- job->progs[i].is_stopped = 0;
-
- job->stopped_progs = 0;
-
- i = kill(- job->pgrp, SIGCONT);
- if (i < 0) {
- if (errno == ESRCH) {
- remove_job(&job_list, job);
- } else {
- bb_perror_msg("kill (SIGCONT)");
- }
- }
-
- return EXIT_SUCCESS;
-}
-
-/* built-in 'help' handler */
-static int builtin_help(struct child_prog UNUSED_PARAM *dummy)
-{
- const struct built_in_command *x;
-
- printf(
- "Built-in commands:\n"
- "------------------\n");
- for (x = bltins; x <= &VEC_LAST(bltins); x++) {
- if (x->descr == NULL)
- continue;
- printf("%s\t%s\n", x->cmd, x->descr);
- }
- bb_putchar('\n');
- return EXIT_SUCCESS;
-}
-
-/* built-in 'jobs' handler */
-static int builtin_jobs(struct child_prog *child)
-{
- struct job *job;
- const char *status_string;
-
- for (job = child->family->job_list->head; job; job = job->next) {
- if (job->running_progs == job->stopped_progs)
- status_string = "Stopped";
- else
- status_string = "Running";
-
- printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
- }
- return EXIT_SUCCESS;
-}
-
-
-/* built-in 'pwd' handler */
-static int builtin_pwd(struct child_prog UNUSED_PARAM *dummy)
-{
- update_cwd();
- puts(cwd);
- return EXIT_SUCCESS;
-}
-
-/* built-in 'export VAR=value' handler */
-static int builtin_export(struct child_prog *child)
-{
- int res;
- char *v = child->argv[1];
-
- if (v == NULL) {
- char **e;
- for (e = environ; *e; e++) {
- puts(*e);
- }
- return 0;
- }
- res = putenv(v);
- if (res)
- bb_perror_msg("export");
-#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
- if (strncmp(v, "PS1=", 4) == 0)
- PS1 = getenv("PS1");
-#endif
-
-#if ENABLE_LOCALE_SUPPORT
- // TODO: why getenv? "" would be just as good...
- if (strncmp(v, "LC_ALL=", 7) == 0)
- setlocale(LC_ALL, getenv("LC_ALL"));
- if (strncmp(v, "LC_CTYPE=", 9) == 0)
- setlocale(LC_CTYPE, getenv("LC_CTYPE"));
-#endif
-
- return res;
-}
-
-/* built-in 'read VAR' handler */
-static int builtin_read(struct child_prog *child)
-{
- int res = 0, len;
- char *s;
- char string[MAX_READ];
-
- if (child->argv[1]) {
- /* argument (VAR) given: put "VAR=" into buffer */
- safe_strncpy(string, child->argv[1], MAX_READ-1);
- len = strlen(string);
- string[len++] = '=';
- string[len] = '\0';
- fgets(&string[len], sizeof(string) - len, stdin); /* read string */
- res = strlen(string);
- if (res > len)
- string[--res] = '\0'; /* chomp trailing newline */
- /*
- ** string should now contain "VAR=<value>"
- ** copy it (putenv() won't do that, so we must make sure
- ** the string resides in a static buffer!)
- */
- res = -1;
- s = strdup(string);
- if (s)
- res = putenv(s);
- if (res)
- bb_perror_msg("read");
- } else
- fgets(string, sizeof(string), stdin);
-
- return res;
-}
-
-/* Built-in '.' handler (read-in and execute commands from file) */
-static int builtin_source(struct child_prog *child)
-{
- FILE *input;
- int status;
-
- input = fopen_or_warn(child->argv[1], "r");
- if (!input) {
- return EXIT_FAILURE;
- }
-
- llist_add_to(&close_me_list, (void *)(long)fileno(input));
- /* Now run the file */
- status = busy_loop(input);
- fclose(input);
- llist_pop(&close_me_list);
- return status;
-}
-
-/* built-in 'unset VAR' handler */
-static int builtin_unset(struct child_prog *child)
-{
- if (child->argv[1] == NULL) {
- printf(bb_msg_requires_arg, "unset");
- return EXIT_FAILURE;
- }
- unsetenv(child->argv[1]);
- return EXIT_SUCCESS;
-}
-
-#if ENABLE_LASH_JOB_CONTROL
-/* free up all memory from a job */
-static void free_job(struct job *cmd)
-{
- int i;
- struct jobset *keep;
-
- for (i = 0; i < cmd->num_progs; i++) {
- free(cmd->progs[i].argv);
-#if ENABLE_LASH_PIPE_N_REDIRECTS
- free(cmd->progs[i].redirects);
-#endif
- }
- free(cmd->progs);
- free(cmd->text);
- free(cmd->cmdbuf);
- keep = cmd->job_list;
- memset(cmd, 0, sizeof(struct job));
- cmd->job_list = keep;
-}
-
-/* remove a job from a jobset */
-static void remove_job(struct jobset *j_list, struct job *job)
-{
- struct job *prevjob;
-
- free_job(job);
- if (job == j_list->head) {
- j_list->head = job->next;
- } else {
- prevjob = j_list->head;
- while (prevjob->next != job)
- prevjob = prevjob->next;
- prevjob->next = job->next;
- }
-
- if (j_list->head)
- last_jobid = j_list->head->jobid;
- else
- last_jobid = 0;
-
- free(job);
-}
-
-/* Checks to see if any background processes have exited -- if they
- have, figure out why and see if a job has completed */
-static void checkjobs(struct jobset *j_list)
-{
- struct job *job;
- pid_t childpid;
- int status;
- int prognum = 0;
-
- while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
- for (job = j_list->head; job; job = job->next) {
- prognum = 0;
- while (prognum < job->num_progs &&
- job->progs[prognum].pid != childpid) prognum++;
- if (prognum < job->num_progs)
- break;
- }
-
- /* This happens on backticked commands */
- if (job == NULL)
- return;
-
- if (WIFEXITED(status) || WIFSIGNALED(status)) {
- /* child exited */
- job->running_progs--;
- job->progs[prognum].pid = 0;
-
- if (!job->running_progs) {
- printf(JOB_STATUS_FORMAT, job->jobid, "Done", job->text);
- last_jobid = 0;
- remove_job(j_list, job);
- }
- } else {
- /* child stopped */
- job->stopped_progs++;
- job->progs[prognum].is_stopped = 1;
- }
- }
-
- if (childpid == -1 && errno != ECHILD)
- bb_perror_msg("waitpid");
-}
-#else
-static void checkjobs(struct jobset *j_list)
-{
-}
-static void free_job(struct job *cmd)
-{
-}
-static void remove_job(struct jobset *j_list, struct job *job)
-{
-}
-#endif
-
-#if ENABLE_LASH_PIPE_N_REDIRECTS
-/* squirrel != NULL means we squirrel away copies of stdin, stdout,
- * and stderr if they are redirected. */
-static int setup_redirects(struct child_prog *prog, int squirrel[])
-{
- int i;
- int openfd;
- int mode = O_RDONLY;
- struct redir_struct *redir = prog->redirects;
-
- for (i = 0; i < prog->num_redirects; i++, redir++) {
- switch (redir->type) {
- case REDIRECT_INPUT:
- mode = O_RDONLY;
- break;
- case REDIRECT_OVERWRITE:
- mode = O_WRONLY | O_CREAT | O_TRUNC;
- break;
- case REDIRECT_APPEND:
- mode = O_WRONLY | O_CREAT | O_APPEND;
- break;
- }
-
- openfd = open_or_warn(redir->filename, mode);
- if (openfd < 0) {
- /* this could get lost if stderr has been redirected, but
- bash and ash both lose it as well (though zsh doesn't!) */
- return 1;
- }
-
- if (openfd != redir->fd) {
- if (squirrel && redir->fd < 3) {
- squirrel[redir->fd] = dup(redir->fd);
- close_on_exec_on(squirrel[redir->fd]);
- }
- dup2(openfd, redir->fd);
- close(openfd);
- }
- }
-
- return 0;
-}
-
-static void restore_redirects(int squirrel[])
-{
- int i, fd;
- for (i = 0; i < 3; i++) {
- fd = squirrel[i];
- if (fd != -1) {
- /* No error checking. I sure wouldn't know what
- * to do with an error if I found one! */
- dup2(fd, i);
- close(fd);
- }
- }
-}
-#else
-static inline int setup_redirects(struct child_prog *prog, int squirrel[])
-{
- return 0;
-}
-static inline void restore_redirects(int squirrel[])
-{
-}
-#endif
-
-static inline void cmdedit_set_initial_prompt(void)
-{
-#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- PS1 = NULL;
-#else
- PS1 = getenv("PS1");
- if (PS1 == 0)
- PS1 = "\\w \\$ ";
-#endif
-}
-
-static inline const char* setup_prompt_string(void)
-{
-#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- /* Set up the prompt */
- if (shell_context == 0) {
- char *ns;
- free((char*)PS1);
- ns = xmalloc(strlen(cwd)+4);
- sprintf(ns, "%s %c ", cwd, (geteuid() != 0) ? '$': '#');
- PS1 = ns;
- return ns;
- } else {
- return PS2;
- }
-#else
- return (shell_context == 0)? PS1 : PS2;
-#endif
-}
-
-#if ENABLE_FEATURE_EDITING
-static line_input_t *line_input_state;
-#endif
-
-static int get_command_bufsiz(FILE *source, char *command)
-{
- const char *prompt_str;
-
- if (source == NULL) {
- if (local_pending_command) {
- /* a command specified (-c option): return it & mark it done */
- strncpy(command, local_pending_command, BUFSIZ);
- local_pending_command = NULL;
- return 0;
- }
- return 1;
- }
-
- if (source == stdin) {
- prompt_str = setup_prompt_string();
-
-#if ENABLE_FEATURE_EDITING
- /*
- ** enable command line editing only while a command line
- ** is actually being read; otherwise, we'll end up bequeathing
- ** atexit() handlers and other unwanted stuff to our
- ** child processes (rob@sysgo.de)
- */
- read_line_input(prompt_str, command, BUFSIZ, line_input_state);
- return 0;
-#else
- fputs(prompt_str, stdout);
-#endif
- }
-
- if (!fgets(command, BUFSIZ - 2, source)) {
- if (source == stdin)
- bb_putchar('\n');
- return 1;
- }
-
- return 0;
-}
-
-static char * strsep_space(char *string, int * ix)
-{
- /* Short circuit the trivial case */
- if (!string || ! string[*ix])
- return NULL;
-
- /* Find the end of the token. */
- while (string[*ix] && !isspace(string[*ix]) ) {
- (*ix)++;
- }
-
- /* Find the end of any whitespace trailing behind
- * the token and let that be part of the token */
- while (string[*ix] && isspace(string[*ix])) {
- (*ix)++;
- }
-
- if (!*ix) {
- /* Nothing useful was found */
- return NULL;
- }
-
- return xstrndup(string, *ix);
-}
-
-static int expand_arguments(char *command)
-{
- static const char out_of_space[] ALIGN1 = "out of space during expansion";
-
- int total_length = 0, length, i, retval, ix = 0;
- expand_t expand_result;
- char *tmpcmd, *cmd, *cmd_copy;
- char *src, *dst, *var;
- int flags = GLOB_NOCHECK
-#ifdef GLOB_BRACE
- | GLOB_BRACE
-#endif
-#ifdef GLOB_TILDE
- | GLOB_TILDE
-#endif
- ;
-
- /* get rid of the terminating \n */
- chomp(command);
-
- /* Fix up escape sequences to be the Real Thing(tm) */
- while (command && command[ix]) {
- if (command[ix] == '\\') {
- const char *tmp = command+ix+1;
- command[ix] = bb_process_escape_sequence( &tmp );
- memmove(command+ix + 1, tmp, strlen(tmp)+1);
- }
- ix++;
- }
- /* Use glob and then fixup environment variables and such */
-
- /* It turns out that glob is very stupid. We have to feed it one word at a
- * time since it can't cope with a full string. Here we convert command
- * (char*) into cmd (char**, one word per string) */
-
- /* We need a clean copy, so strsep can mess up the copy while
- * we write stuff into the original (in a minute) */
- cmd = cmd_copy = xstrdup(command);
- *command = '\0';
- for (ix = 0, tmpcmd = cmd;
- (tmpcmd = strsep_space(cmd, &ix)) != NULL; cmd += ix, ix = 0) {
- if (*tmpcmd == '\0')
- break;
- /* we need to trim() the result for glob! */
- trim(tmpcmd);
- retval = glob(tmpcmd, flags, NULL, &expand_result);
- free(tmpcmd); /* Free mem allocated by strsep_space */
- if (retval == GLOB_NOSPACE) {
- /* Mem may have been allocated... */
- globfree(&expand_result);
- bb_error_msg(out_of_space);
- return FALSE;
- } else if (retval != 0) {
- /* Some other error. GLOB_NOMATCH shouldn't
- * happen because of the GLOB_NOCHECK flag in
- * the glob call. */
- bb_error_msg("syntax error");
- return FALSE;
- } else {
- /* Convert from char** (one word per string) to a simple char*,
- * but don't overflow command which is BUFSIZ in length */
- for (i = 0; i < expand_result.gl_pathc; i++) {
- length = strlen(expand_result.gl_pathv[i]);
- if (total_length+length+1 >= BUFSIZ) {
- bb_error_msg(out_of_space);
- return FALSE;
- }
- strcat(command+total_length, " ");
- total_length += 1;
- strcat(command+total_length, expand_result.gl_pathv[i]);
- total_length += length;
- }
- globfree(&expand_result);
- }
- }
- free(cmd_copy);
- trim(command);
-
- /* Now do the shell variable substitutions which
- * wordexp can't do for us, namely $? and $! */
- src = command;
- while ((dst = strchr(src,'$')) != NULL) {
- var = NULL;
- switch (*(dst+1)) {
- case '?':
- var = itoa(last_return_code);
- break;
- case '!':
- if (last_bg_pid == -1)
- *var = '\0';
- else
- var = itoa(last_bg_pid);
- break;
- /* Everything else like $$, $#, $[0-9], etc. should all be
- * expanded by wordexp(), so we can in theory skip that stuff
- * here, but just to be on the safe side (i.e., since uClibc
- * wordexp doesn't do this stuff yet), lets leave it in for
- * now. */
- case '$':
- var = itoa(getpid());
- break;
- case '#':
- var = itoa(global_argc - 1);
- break;
- case '0':case '1':case '2':case '3':case '4':
- case '5':case '6':case '7':case '8':case '9':
- {
- int ixx = *(dst+1)-48+1;
- if (ixx >= global_argc) {
- var = '\0';
- } else {
- var = global_argv[ixx];
- }
- }
- break;
-
- }
- if (var) {
- /* a single character construction was found, and
- * already handled in the case statement */
- src = dst + 2;
- } else {
- /* Looks like an environment variable */
- char delim_hold;
- int num_skip_chars = 0;
- int dstlen = strlen(dst);
- /* Is this a ${foo} type variable? */
- if (dstlen >= 2 && *(dst+1) == '{') {
- src = strchr(dst+1, '}');
- num_skip_chars = 1;
- } else {
- src = dst + 1;
- while (isalnum(*src) || *src == '_') src++;
- }
- if (src == NULL) {
- src = dst+dstlen;
- }
- delim_hold = *src;
- *src = '\0'; /* temporary */
- var = getenv(dst + 1 + num_skip_chars);
- *src = delim_hold;
- src += num_skip_chars;
- }
- if (var == NULL) {
- /* Seems we got an un-expandable variable. So delete it. */
- var = (char*)"";
- }
- {
- int subst_len = strlen(var);
- int trail_len = strlen(src);
- if (dst+subst_len+trail_len >= command+BUFSIZ) {
- bb_error_msg(out_of_space);
- return FALSE;
- }
- /* Move stuff to the end of the string to accommodate
- * filling the created gap with the new stuff */
- memmove(dst+subst_len, src, trail_len+1);
- /* Now copy in the new stuff */
- memcpy(dst, var, subst_len);
- src = dst+subst_len;
- }
- }
-
- return TRUE;
-}
-
-/* Return cmd->num_progs as 0 if no command is present (e.g. an empty
- line). If a valid command is found, command_ptr is set to point to
- the beginning of the next command (if the original command had more
- then one job associated with it) or NULL if no more commands are
- present. */
-static int parse_command(char **command_ptr, struct job *job, int *inbg)
-{
- char *command;
- char *return_command = NULL;
- char *src, *buf;
- int argc_l;
- int flag;
- int argv_alloced;
- char quote = '\0';
- struct child_prog *prog;
-#if ENABLE_LASH_PIPE_N_REDIRECTS
- int i;
- char *chptr;
-#endif
-
- /* skip leading white space */
- *command_ptr = skip_whitespace(*command_ptr);
-
- /* this handles empty lines or leading '#' characters */
- if (!**command_ptr || (**command_ptr == '#')) {
- job->num_progs = 0;
- return 0;
- }
-
- *inbg = 0;
- job->num_progs = 1;
- job->progs = xmalloc(sizeof(*job->progs));
-
- /* We set the argv elements to point inside of this string. The
- memory is freed by free_job(). Allocate twice the original
- length in case we need to quote every single character.
-
- Getting clean memory relieves us of the task of NULL
- terminating things and makes the rest of this look a bit
- cleaner (though it is, admittedly, a tad less efficient) */
- job->cmdbuf = command = xzalloc(2*strlen(*command_ptr) + 1);
- job->text = NULL;
-
- prog = job->progs;
- prog->num_redirects = 0;
- prog->is_stopped = 0;
- prog->family = job;
-#if ENABLE_LASH_PIPE_N_REDIRECTS
- prog->redirects = NULL;
-#endif
-
- argv_alloced = 5;
- prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced);
- prog->argv[0] = job->cmdbuf;
-
- flag = argc_l = 0;
- buf = command;
- src = *command_ptr;
- while (*src && !(flag & LASH_OPT_DONE)) {
- if (quote == *src) {
- quote = '\0';
- } else if (quote) {
- if (*src == '\\') {
- src++;
- if (!*src) {
- bb_error_msg("character expected after \\");
- free_job(job);
- return 1;
- }
-
- /* in shell, "\'" should yield \' */
- if (*src != quote) {
- *buf++ = '\\';
- *buf++ = '\\';
- }
- } else
- if (*src == '*' || *src == '?'
- || *src == '[' || *src == ']'
- ) {
- *buf++ = '\\';
- }
- *buf++ = *src;
- } else if (isspace(*src)) {
- if (*prog->argv[argc_l] || (flag & LASH_OPT_SAW_QUOTE)) {
- buf++, argc_l++;
- /* +1 here leaves room for the NULL which ends argv */
- if ((argc_l + 1) == argv_alloced) {
- argv_alloced += 5;
- prog->argv = xrealloc(prog->argv,
- sizeof(*prog->argv) * argv_alloced);
- }
- prog->argv[argc_l] = buf;
- flag ^= LASH_OPT_SAW_QUOTE;
- }
- } else
- switch (*src) {
- case '"':
- case '\'':
- quote = *src;
- flag |= LASH_OPT_SAW_QUOTE;
- break;
-
- case '#': /* comment */
- if (*(src-1)== '$')
- *buf++ = *src;
- else
- flag |= LASH_OPT_DONE;
- break;
-
-#if ENABLE_LASH_PIPE_N_REDIRECTS
- case '>': /* redirects */
- case '<':
- i = prog->num_redirects++;
- prog->redirects = xrealloc(prog->redirects,
- sizeof(*prog->redirects) * (i + 1));
-
- prog->redirects[i].fd = -1;
- if (buf != prog->argv[argc_l]) {
- /* the stuff before this character may be the file number
- being redirected */
- prog->redirects[i].fd =
- strtol(prog->argv[argc_l], &chptr, 10);
-
- if (*chptr && *prog->argv[argc_l]) {
- buf++, argc_l++;
- prog->argv[argc_l] = buf;
- }
- }
-
- if (prog->redirects[i].fd == -1) {
- if (*src == '>')
- prog->redirects[i].fd = 1;
- else
- prog->redirects[i].fd = 0;
- }
-
- if (*src++ == '>') {
- if (*src == '>')
- prog->redirects[i].type =
- REDIRECT_APPEND, src++;
- else
- prog->redirects[i].type = REDIRECT_OVERWRITE;
- } else {
- prog->redirects[i].type = REDIRECT_INPUT;
- }
-
- /* This isn't POSIX sh compliant. Oh well. */
- chptr = src;
- chptr = skip_whitespace(chptr);
-
- if (!*chptr) {
- bb_error_msg("file name expected after %c", *(src-1));
- free_job(job);
- job->num_progs = 0;
- return 1;
- }
-
- prog->redirects[i].filename = buf;
- while (*chptr && !isspace(*chptr))
- *buf++ = *chptr++;
-
- src = chptr - 1; /* we src++ later */
- prog->argv[argc_l] = ++buf;
- break;
-
- case '|': /* pipe */
- /* finish this command */
- if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE)
- argc_l++;
- if (!argc_l) {
- goto empty_command_in_pipe;
- }
- prog->argv[argc_l] = NULL;
-
- /* and start the next */
- job->num_progs++;
- job->progs = xrealloc(job->progs,
- sizeof(*job->progs) * job->num_progs);
- prog = job->progs + (job->num_progs - 1);
- prog->num_redirects = 0;
- prog->redirects = NULL;
- prog->is_stopped = 0;
- prog->family = job;
- argc_l = 0;
-
- argv_alloced = 5;
- prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced);
- prog->argv[0] = ++buf;
-
- src++;
- src = skip_whitespace(src);
-
- if (!*src) {
-empty_command_in_pipe:
- bb_error_msg("empty command in pipe");
- free_job(job);
- job->num_progs = 0;
- return 1;
- }
- src--; /* we'll ++ it at the end of the loop */
-
- break;
-#endif
-
-#if ENABLE_LASH_JOB_CONTROL
- case '&': /* background */
- *inbg = 1;
- /* fallthrough */
-#endif
- case ';': /* multiple commands */
- flag |= LASH_OPT_DONE;
- return_command = *command_ptr + (src - *command_ptr) + 1;
- break;
-
- case '\\':
- src++;
- if (!*src) {
- bb_error_msg("character expected after \\");
- free_job(job);
- return 1;
- }
- if (*src == '*' || *src == '[' || *src == ']'
- || *src == '?') *buf++ = '\\';
- /* fallthrough */
- default:
- *buf++ = *src;
- }
-
- src++;
- }
-
- if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE) {
- argc_l++;
- }
- if (!argc_l) {
- free_job(job);
- return 0;
- }
- prog->argv[argc_l] = NULL;
-
- if (!return_command) {
- job->text = xstrdup(*command_ptr);
- } else {
- /* This leaves any trailing spaces, which is a bit sloppy */
- job->text = xstrndup(*command_ptr, return_command - *command_ptr);
- }
-
- *command_ptr = return_command;
-
- return 0;
-}
-
-/* Run the child_prog, no matter what kind of command it uses.
- */
-static int pseudo_exec(struct child_prog *child)
-{
- const struct built_in_command *x;
-
- /* Check if the command matches any of the non-forking builtins.
- * Depending on context, this might be redundant. But it's
- * easier to waste a few CPU cycles than it is to figure out
- * if this is one of those cases.
- */
- /* Check if the command matches any of the forking builtins. */
- for (x = bltins; x <= &VEC_LAST(bltins); x++) {
- if (strcmp(child->argv[0], x->cmd) == 0) {
- _exit(x->function(child));
- }
- }
-
- /* Check if the command matches any busybox internal
- * commands ("applets") here. Following discussions from
- * November 2000 on busybox@busybox.net, don't use
- * bb_get_last_path_component_nostrip(). This way explicit
- * (with slashes) filenames will never be interpreted as an
- * applet, just like with builtins. This way the user can
- * override an applet with an explicit filename reference.
- * The only downside to this change is that an explicit
- * /bin/foo invocation will fork and exec /bin/foo, even if
- * /bin/foo is a symlink to busybox.
- */
- if (ENABLE_FEATURE_SH_STANDALONE) {
- run_applet_and_exit(child->argv[0], child->argv);
- }
-
- execvp(child->argv[0], child->argv);
-
- /* Do not use bb_perror_msg_and_die() here, since we must not
- * call exit() but should call _exit() instead */
- bb_simple_perror_msg(child->argv[0]);
- _exit(EXIT_FAILURE);
-}
-
-static void insert_job(struct job *newjob, int inbg)
-{
- struct job *thejob;
- struct jobset *j_list = newjob->job_list;
-
- /* find the ID for thejob to use */
- newjob->jobid = 1;
- for (thejob = j_list->head; thejob; thejob = thejob->next)
- if (thejob->jobid >= newjob->jobid)
- newjob->jobid = thejob->jobid + 1;
-
- /* add thejob to the list of running jobs */
- if (!j_list->head) {
- thejob = j_list->head = xmalloc(sizeof(*thejob));
- } else {
- for (thejob = j_list->head; thejob->next; thejob = thejob->next) /* nothing */;
- thejob->next = xmalloc(sizeof(*thejob));
- thejob = thejob->next;
- }
-
- *thejob = *newjob; /* physically copy the struct job */
- thejob->next = NULL;
- thejob->running_progs = thejob->num_progs;
- thejob->stopped_progs = 0;
-
-#if ENABLE_LASH_JOB_CONTROL
- if (inbg) {
- /* we don't wait for background thejobs to return -- append it
- to the list of backgrounded thejobs and leave it alone */
- printf("[%d] %d\n", thejob->jobid,
- newjob->progs[newjob->num_progs - 1].pid);
- last_jobid = newjob->jobid;
- last_bg_pid = newjob->progs[newjob->num_progs - 1].pid;
- } else {
- newjob->job_list->fg = thejob;
-
- /* move the new process group into the foreground */
- /* Ignore errors since child could have already exited */
- tcsetpgrp(shell_terminal, newjob->pgrp);
- }
-#endif
-}
-
-static int run_command(struct job *newjob, int inbg, int outpipe[2])
-{
- /* struct job *thejob; */
- int i;
- int nextin, nextout;
- int pipefds[2]; /* pipefd[0] is for reading */
- const struct built_in_command *x;
- struct child_prog *child;
-
- nextin = 0;
- for (i = 0; i < newjob->num_progs; i++) {
- child = &(newjob->progs[i]);
-
- nextout = 1;
- if ((i + 1) < newjob->num_progs) {
- xpipe(pipefds);
- nextout = pipefds[1];
- } else if (outpipe[1] != -1) {
- nextout = outpipe[1];
- }
-
- /* Check if the command matches any non-forking builtins,
- * but only if this is a simple command.
- * Non-forking builtins within pipes have to fork anyway,
- * and are handled in pseudo_exec. "echo foo | read bar"
- * is doomed to failure, and doesn't work on bash, either.
- */
- if (newjob->num_progs == 1) {
- int rcode;
- int squirrel[] = {-1, -1, -1};
-
- /* Check if the command sets an environment variable. */
- if (strchr(child->argv[0], '=') != NULL) {
- child->argv[1] = child->argv[0];
- return builtin_export(child);
- }
-
- for (x = bltins; x <= &VEC_LAST(bltins); x++) {
- if (strcmp(child->argv[0], x->cmd) == 0) {
- setup_redirects(child, squirrel);
- rcode = x->function(child);
- restore_redirects(squirrel);
- return rcode;
- }
- }
-#if ENABLE_FEATURE_SH_STANDALONE
- {
- int a = find_applet_by_name(child->argv[i]);
- if (a >= 0 && APPLET_IS_NOFORK(a)) {
- setup_redirects(child, squirrel);
- rcode = run_nofork_applet(a, child->argv + i);
- restore_redirects(squirrel);
- return rcode;
- }
- }
-#endif
- }
-
-#if BB_MMU
- child->pid = fork();
-#else
- child->pid = vfork();
-#endif
- if (!child->pid) {
- /* Set the handling for job control signals back to the default. */
- signal(SIGINT, SIG_DFL);
- signal(SIGQUIT, SIG_DFL);
- signal(SIGTSTP, SIG_DFL);
- signal(SIGTTIN, SIG_DFL);
- signal(SIGTTOU, SIG_DFL);
- signal(SIGCHLD, SIG_DFL);
-
- /* Close all open filehandles. */
- while (close_me_list)
- close((long)llist_pop(&close_me_list));
-
- if (outpipe[1] != -1) {
- close(outpipe[0]);
- }
- if (nextin != 0) {
- dup2(nextin, 0);
- close(nextin);
- }
-
- if (nextout != 1) {
- dup2(nextout, 1);
- dup2(nextout, 2); /* Really? */
- close(nextout);
- close(pipefds[0]);
- }
-
- /* explicit redirects override pipes */
- setup_redirects(child,NULL);
-
- pseudo_exec(child);
- }
- if (outpipe[1] != -1) {
- close(outpipe[1]);
- }
-
- /* put our child in the process group whose leader is the
- first process in this pipe */
- setpgid(child->pid, newjob->progs[0].pid);
- if (nextin != 0)
- close(nextin);
- if (nextout != 1)
- close(nextout);
-
- /* If there isn't another process, nextin is garbage
- but it doesn't matter */
- nextin = pipefds[0];
- }
-
- newjob->pgrp = newjob->progs[0].pid;
-
- insert_job(newjob, inbg);
-
- return 0;
-}
-
-static int busy_loop(FILE *input)
-{
- char *command;
- char *next_command = NULL;
- struct job newjob;
- int i;
- int inbg = 0;
- int status;
-#if ENABLE_LASH_JOB_CONTROL
- pid_t parent_pgrp;
- /* save current owner of TTY so we can restore it on exit */
- parent_pgrp = tcgetpgrp(shell_terminal);
-#endif
- newjob.job_list = &job_list;
- newjob.job_context = DEFAULT_CONTEXT;
-
- command = xzalloc(BUFSIZ);
-
- while (1) {
- if (!job_list.fg) {
- /* no job is in the foreground */
-
- /* see if any background processes have exited */
- checkjobs(&job_list);
-
- if (!next_command) {
- if (get_command_bufsiz(input, command))
- break;
- next_command = command;
- }
-
- if (!expand_arguments(next_command)) {
- free(command);
- command = xzalloc(BUFSIZ);
- next_command = NULL;
- continue;
- }
-
- if (!parse_command(&next_command, &newjob, &inbg)
- && newjob.num_progs
- ) {
- int pipefds[2] = { -1, -1 };
- debug_printf("job=%p fed to run_command by busy_loop()'\n",
- &newjob);
- run_command(&newjob, inbg, pipefds);
- }
- else {
- free(command);
- command = xzalloc(BUFSIZ);
- next_command = NULL;
- }
- } else {
- /* a job is running in the foreground; wait for it */
- i = 0;
- while (!job_list.fg->progs[i].pid ||
- job_list.fg->progs[i].is_stopped == 1) i++;
-
- if (waitpid(job_list.fg->progs[i].pid, &status, WUNTRACED) < 0) {
- if (errno != ECHILD) {
- bb_perror_msg_and_die("waitpid(%d)", job_list.fg->progs[i].pid);
- }
- }
-
- if (WIFEXITED(status) || WIFSIGNALED(status)) {
- /* the child exited */
- job_list.fg->running_progs--;
- job_list.fg->progs[i].pid = 0;
-
- last_return_code = WEXITSTATUS(status);
-
- if (!job_list.fg->running_progs) {
- /* child exited */
- remove_job(&job_list, job_list.fg);
- job_list.fg = NULL;
- }
- }
-#if ENABLE_LASH_JOB_CONTROL
- else {
- /* the child was stopped */
- job_list.fg->stopped_progs++;
- job_list.fg->progs[i].is_stopped = 1;
-
- if (job_list.fg->stopped_progs == job_list.fg->running_progs) {
- printf("\n" JOB_STATUS_FORMAT, job_list.fg->jobid,
- "Stopped", job_list.fg->text);
- job_list.fg = NULL;
- }
- }
-
- if (!job_list.fg) {
- /* move the shell to the foreground */
- /* suppress messages when run from /linuxrc mag@sysgo.de */
- if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp");
- }
-#endif
- }
- }
- free(command);
-
-#if ENABLE_LASH_JOB_CONTROL
- /* return controlling TTY back to parent process group before exiting */
- if (tcsetpgrp(shell_terminal, parent_pgrp) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp");
-#endif
-
- /* return exit status if called with "-c" */
- if (input == NULL && WIFEXITED(status))
- return WEXITSTATUS(status);
-
- return 0;
-}
-
-#if ENABLE_FEATURE_CLEAN_UP
-static void free_memory(void)
-{
- free(cwd);
-
- if (job_list.fg && !job_list.fg->running_progs) {
- remove_job(&job_list, job_list.fg);
- }
-}
-#else
-void free_memory(void);
-#endif
-
-#if ENABLE_LASH_JOB_CONTROL
-/* Make sure we have a controlling tty. If we get started under a job
- * aware app (like bash for example), make sure we are now in charge so
- * we don't fight over who gets the foreground */
-static void setup_job_control(void)
-{
- int status;
- pid_t shell_pgrp;
-
- /* Loop until we are in the foreground. */
- while ((status = tcgetpgrp(shell_terminal)) >= 0) {
- shell_pgrp = getpgrp();
- if (status == shell_pgrp) {
- break;
- }
- kill(- shell_pgrp, SIGTTIN);
- }
-
- /* Ignore interactive and job-control signals. */
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
- signal(SIGTSTP, SIG_IGN);
- signal(SIGTTIN, SIG_IGN);
- signal(SIGTTOU, SIG_IGN);
- signal(SIGCHLD, SIG_IGN);
-
- /* Put ourselves in our own process group. */
- setsid();
- shell_pgrp = getpid();
- setpgid(shell_pgrp, shell_pgrp);
-
- /* Grab control of the terminal. */
- tcsetpgrp(shell_terminal, shell_pgrp);
-}
-#else
-static inline void setup_job_control(void)
-{
-}
-#endif
-
-int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int lash_main(int argc, char **argv)
-{
- unsigned opt;
- FILE *input = stdin;
-
- global_argc = argc;
- global_argv = argv;
-
-#if ENABLE_FEATURE_EDITING
- line_input_state = new_line_input_t(FOR_SHELL);
-#endif
-
- /* These variables need re-initializing when recursing */
- last_jobid = 0;
- close_me_list = NULL;
- job_list.head = NULL;
- job_list.fg = NULL;
- last_return_code = 1;
-
- if (global_argv[0] && global_argv[0][0] == '-') {
- FILE *prof_input;
- prof_input = fopen_for_read("/etc/profile");
- if (prof_input) {
- llist_add_to(&close_me_list, (void *)(long)fileno(prof_input));
- /* Now run the file */
- busy_loop(prof_input);
- fclose_if_not_stdin(prof_input);
- llist_pop(&close_me_list);
- }
- }
-
- opt = getopt32(argv, "+ic:", &local_pending_command);
-#define LASH_OPT_i (1<<0)
-#define LASH_OPT_c (1<<1)
- if (opt & LASH_OPT_c) {
- input = NULL;
- optind++;
- global_argv += optind;
- }
- /* A shell is interactive if the `-i' flag was given, or if all of
- * the following conditions are met:
- * no -c command
- * no arguments remaining or the -s flag given
- * standard input is a terminal
- * standard output is a terminal
- * Refer to Posix.2, the description of the `sh' utility. */
- if (global_argv[optind] == NULL && input == stdin
- && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
- ) {
- opt |= LASH_OPT_i;
- }
- setup_job_control();
- if (opt & LASH_OPT_i) {
- /* Looks like they want an interactive shell */
- if (!ENABLE_FEATURE_SH_EXTRA_QUIET) {
- printf("\n\n%s built-in shell (lash)\n"
- "Enter 'help' for a list of built-in commands.\n\n",
- bb_banner);
- }
- } else if (!local_pending_command && global_argv[optind]) {
- //printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
- input = xfopen_for_read(global_argv[optind]);
- /* be lazy, never mark this closed */
- llist_add_to(&close_me_list, (void *)(long)fileno(input));
- }
-
- /* initialize the cwd -- this is never freed...*/
- update_cwd();
-
- if (ENABLE_FEATURE_CLEAN_UP) atexit(free_memory);
-
- if (ENABLE_FEATURE_EDITING) cmdedit_set_initial_prompt();
- else PS1 = NULL;
-
- return busy_loop(input);
-}
+++ /dev/null
-/* vi: set sw=4 ts=4: */
-/*
- * Minix shell port for busybox
- *
- * This version of the Minix shell was adapted for use in busybox
- * by Erik Andersen <andersen@codepoet.org>
- *
- * - backtick expansion did not work properly
- * Jonas Holmberg <jonas.holmberg@axis.com>
- * Robert Schwebel <r.schwebel@pengutronix.de>
- * Erik Andersen <andersen@codepoet.org>
- *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- */
-#include <sys/times.h>
-#include <setjmp.h>
-
-#ifdef STANDALONE
-# ifndef _GNU_SOURCE
-# define _GNU_SOURCE
-# endif
-# include <sys/types.h>
-# include <sys/stat.h>
-# include <sys/wait.h>
-# include <signal.h>
-# include <stdio.h>
-# include <stdlib.h>
-# include <unistd.h>
-# include <string.h>
-# include <errno.h>
-# include <dirent.h>
-# include <fcntl.h>
-# include <ctype.h>
-# include <assert.h>
-# define bb_dev_null "/dev/null"
-# define DEFAULT_SHELL "/proc/self/exe"
-# define bb_banner "busybox standalone"
-# define ENABLE_FEATURE_SH_STANDALONE 0
-# define bb_msg_memory_exhausted "memory exhausted"
-# define xmalloc(size) malloc(size)
-# define msh_main(argc,argv) main(argc,argv)
-# define safe_read(fd,buf,count) read(fd,buf,count)
-# define nonblock_safe_read(fd,buf,count) read(fd,buf,count)
-# define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1])
-# define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
-# define NORETURN __attribute__ ((__noreturn__))
-static int find_applet_by_name(const char *applet)
-{
- return -1;
-}
-static char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
-{
- unsigned i, out, res;
- assert(sizeof(unsigned) == 4);
- if (buflen) {
- out = 0;
- for (i = 1000000000; i; i /= 10) {
- res = n / i;
- if (res || out || i == 1) {
- if (!--buflen) break;
- out++;
- n -= res*i;
- *buf++ = '0' + res;
- }
- }
- }
- return buf;
-}
-static char *itoa_to_buf(int n, char *buf, unsigned buflen)
-{
- if (buflen && n < 0) {
- n = -n;
- *buf++ = '-';
- buflen--;
- }
- return utoa_to_buf((unsigned)n, buf, buflen);
-}
-static char local_buf[12];
-static char *itoa(int n)
-{
- *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
- return local_buf;
-}
-#else
-# include "busybox.h" /* for applet_names */
-#endif
-
-//#define MSHDEBUG 4
-
-#ifdef MSHDEBUG
-static int mshdbg = MSHDEBUG;
-
-#define DBGPRINTF(x) if (mshdbg > 0) printf x
-#define DBGPRINTF0(x) if (mshdbg > 0) printf x
-#define DBGPRINTF1(x) if (mshdbg > 1) printf x
-#define DBGPRINTF2(x) if (mshdbg > 2) printf x
-#define DBGPRINTF3(x) if (mshdbg > 3) printf x
-#define DBGPRINTF4(x) if (mshdbg > 4) printf x
-#define DBGPRINTF5(x) if (mshdbg > 5) printf x
-#define DBGPRINTF6(x) if (mshdbg > 6) printf x
-#define DBGPRINTF7(x) if (mshdbg > 7) printf x
-#define DBGPRINTF8(x) if (mshdbg > 8) printf x
-#define DBGPRINTF9(x) if (mshdbg > 9) printf x
-
-static int mshdbg_rc = 0;
-
-#define RCPRINTF(x) if (mshdbg_rc) printf x
-
-#else
-
-#define DBGPRINTF(x)
-#define DBGPRINTF0(x) ((void)0)
-#define DBGPRINTF1(x) ((void)0)
-#define DBGPRINTF2(x) ((void)0)
-#define DBGPRINTF3(x) ((void)0)
-#define DBGPRINTF4(x) ((void)0)
-#define DBGPRINTF5(x) ((void)0)
-#define DBGPRINTF6(x) ((void)0)
-#define DBGPRINTF7(x) ((void)0)
-#define DBGPRINTF8(x) ((void)0)
-#define DBGPRINTF9(x) ((void)0)
-
-#define RCPRINTF(x) ((void)0)
-
-#endif /* MSHDEBUG */
-
-
-#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
-# define DEFAULT_ROOT_PROMPT "\\u:\\w> "
-# define DEFAULT_USER_PROMPT "\\u:\\w$ "
-#else
-# define DEFAULT_ROOT_PROMPT "# "
-# define DEFAULT_USER_PROMPT "$ "
-#endif
-
-
-/* -------- sh.h -------- */
-/*
- * shell
- */
-
-#define LINELIM 2100
-#define NPUSH 8 /* limit to input nesting */
-
-#undef NOFILE
-#define NOFILE 20 /* Number of open files */
-#define NUFILE 10 /* Number of user-accessible files */
-#define FDBASE 10 /* First file usable by Shell */
-
-/*
- * values returned by wait
- */
-#define WAITSIG(s) ((s) & 0177)
-#define WAITVAL(s) (((s) >> 8) & 0377)
-#define WAITCORE(s) (((s) & 0200) != 0)
-
-/*
- * library and system definitions
- */
-typedef void xint; /* base type of jmp_buf, for not broken compilers */
-
-/*
- * shell components
- */
-#define NOBLOCK ((struct op *)NULL)
-#define NOWORD ((char *)NULL)
-#define NOWORDS ((char **)NULL)
-#define NOPIPE ((int *)NULL)
-
-/*
- * redirection
- */
-struct ioword {
- smallint io_flag; /* action (below) */
- int io_fd; /* fd affected */
- char *io_name; /* file name */
-};
-
-#define IOREAD 1 /* < */
-#define IOHERE 2 /* << (here file) */
-#define IOWRITE 4 /* > */
-#define IOCAT 8 /* >> */
-#define IOXHERE 16 /* ${}, ` in << */
-#define IODUP 32 /* >&digit */
-#define IOCLOSE 64 /* >&- */
-
-#define IODEFAULT (-1) /* "default" IO fd */
-
-
-/*
- * Description of a command or an operation on commands.
- * Might eventually use a union.
- */
-struct op {
- smallint op_type; /* operation type, see Txxxx below */
- char **op_words; /* arguments to a command */
- struct ioword **ioact; /* IO actions (eg, < > >>) */
- struct op *left;
- struct op *right;
- char *str; /* identifier for case and for */
-};
-
-#define TCOM 1 /* command */
-#define TPAREN 2 /* (c-list) */
-#define TPIPE 3 /* a | b */
-#define TLIST 4 /* a [&;] b */
-#define TOR 5 /* || */
-#define TAND 6 /* && */
-#define TFOR 7
-#define TDO 8
-#define TCASE 9
-#define TIF 10
-#define TWHILE 11
-#define TUNTIL 12
-#define TELIF 13
-#define TPAT 14 /* pattern in case */
-#define TBRACE 15 /* {c-list} */
-#define TASYNC 16 /* c & */
-/* Added to support "." file expansion */
-#define TDOT 17
-
-/* Strings for names to make debug easier */
-#ifdef MSHDEBUG
-static const char *const T_CMD_NAMES[] = {
- "PLACEHOLDER",
- "TCOM",
- "TPAREN",
- "TPIPE",
- "TLIST",
- "TOR",
- "TAND",
- "TFOR",
- "TDO",
- "TCASE",
- "TIF",
- "TWHILE",
- "TUNTIL",
- "TELIF",
- "TPAT",
- "TBRACE",
- "TASYNC",
- "TDOT",
-};
-#endif
-
-#define AREASIZE (90000)
-
-/*
- * flags to control evaluation of words
- */
-#define DOSUB 1 /* interpret $, `, and quotes */
-#define DOBLANK 2 /* perform blank interpretation */
-#define DOGLOB 4 /* interpret [?* */
-#define DOKEY 8 /* move words with `=' to 2nd arg. list */
-#define DOTRIM 16 /* trim resulting string */
-
-#define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
-
-
-struct brkcon {
- jmp_buf brkpt;
- struct brkcon *nextlev;
-};
-
-
-static smallint trapset; /* trap pending (signal number) */
-
-static smallint yynerrs; /* yacc (flag) */
-
-/* moved to G: static char line[LINELIM]; */
-
-#if ENABLE_FEATURE_EDITING
-static char *current_prompt;
-static line_input_t *line_input_state;
-#endif
-
-
-/*
- * other functions
- */
-static const char *rexecve(char *c, char **v, char **envp);
-static char *evalstr(char *cp, int f);
-static char *putn(int n);
-static char *unquote(char *as);
-static int rlookup(char *n);
-static struct wdblock *glob(char *cp, struct wdblock *wb);
-static int my_getc(int ec);
-static int subgetc(char ec, int quoted);
-static char **makenv(int all, struct wdblock *wb);
-static char **eval(char **ap, int f);
-static int setstatus(int s);
-static int waitfor(int lastpid, int canintr);
-
-static void onintr(int s); /* SIGINT handler */
-
-static int newenv(int f);
-static void quitenv(void);
-static void next(int f);
-static void setdash(void);
-static void onecommand(void);
-static void runtrap(int i);
-
-
-/* -------- area stuff -------- */
-
-#define REGSIZE sizeof(struct region)
-#define GROWBY (256)
-/* #define SHRINKBY (64) */
-#undef SHRINKBY
-#define FREE (32767)
-#define BUSY (0)
-#define ALIGN (sizeof(int)-1)
-
-
-struct region {
- struct region *next;
- int area;
-};
-
-
-/* -------- grammar stuff -------- */
-typedef union {
- char *cp;
- char **wp;
- int i;
- struct op *o;
-} YYSTYPE;
-
-#define WORD 256
-#define LOGAND 257
-#define LOGOR 258
-#define BREAK 259
-#define IF 260
-#define THEN 261
-#define ELSE 262
-#define ELIF 263
-#define FI 264
-#define CASE 265
-#define ESAC 266
-#define FOR 267
-#define WHILE 268
-#define UNTIL 269
-#define DO 270
-#define DONE 271
-#define IN 272
-/* Added for "." file expansion */
-#define DOT 273
-
-#define YYERRCODE 300
-
-/* flags to yylex */
-#define CONTIN 01 /* skip new lines to complete command */
-
-static struct op *pipeline(int cf);
-static struct op *andor(void);
-static struct op *c_list(void);
-static int synio(int cf);
-static void musthave(int c, int cf);
-static struct op *simple(void);
-static struct op *nested(int type, int mark);
-static struct op *command(int cf);
-static struct op *dogroup(int onlydone);
-static struct op *thenpart(void);
-static struct op *elsepart(void);
-static struct op *caselist(void);
-static struct op *casepart(void);
-static char **pattern(void);
-static char **wordlist(void);
-static struct op *list(struct op *t1, struct op *t2);
-static struct op *block(int type, struct op *t1, struct op *t2, char **wp);
-static struct op *newtp(void);
-static struct op *namelist(struct op *t);
-static char **copyw(void);
-static void word(char *cp);
-static struct ioword **copyio(void);
-static struct ioword *io(int u, int f, char *cp);
-static int yylex(int cf);
-static int collect(int c, int c1);
-static int dual(int c);
-static void diag(int ec);
-static char *tree(unsigned size);
-
-/* -------- var.h -------- */
-
-struct var {
- char *value;
- char *name;
- struct var *next;
- char status;
-};
-
-#define COPYV 1 /* flag to setval, suggesting copy */
-#define RONLY 01 /* variable is read-only */
-#define EXPORT 02 /* variable is to be exported */
-#define GETCELL 04 /* name & value space was got with getcell */
-
-static int yyparse(void);
-
-
-/* -------- io.h -------- */
-/* io buffer */
-struct iobuf {
- unsigned id; /* buffer id */
- char buf[512]; /* buffer */
- char *bufp; /* pointer into buffer */
- char *ebufp; /* pointer to end of buffer */
-};
-
-/* possible arguments to an IO function */
-struct ioarg {
- const char *aword;
- char **awordlist;
- int afile; /* file descriptor */
- unsigned afid; /* buffer id */
- off_t afpos; /* file position */
- struct iobuf *afbuf; /* buffer for this file */
-};
-
-/* an input generator's state */
-struct io {
- int (*iofn) (struct ioarg *, struct io *);
- struct ioarg *argp;
- int peekc;
- char prev; /* previous character read by readc() */
- char nlcount; /* for `'s */
- char xchar; /* for `'s */
- char task; /* reason for pushed IO */
-};
-/* ->task: */
-#define XOTHER 0 /* none of the below */
-#define XDOLL 1 /* expanding ${} */
-#define XGRAVE 2 /* expanding `'s */
-#define XIO 3 /* file IO */
-
-
-/*
- * input generators for IO structure
- */
-static int nlchar(struct ioarg *ap);
-static int strchar(struct ioarg *ap);
-static int qstrchar(struct ioarg *ap);
-static int filechar(struct ioarg *ap);
-static int herechar(struct ioarg *ap);
-static int linechar(struct ioarg *ap);
-static int gravechar(struct ioarg *ap, struct io *iop);
-static int qgravechar(struct ioarg *ap, struct io *iop);
-static int dolchar(struct ioarg *ap);
-static int wdchar(struct ioarg *ap);
-static void scraphere(void);
-static void freehere(int area);
-static void gethere(void);
-static void markhere(char *s, struct ioword *iop);
-static int herein(char *hname, int xdoll);
-static int run(struct ioarg *argp, int (*f) (struct ioarg *));
-
-
-static int eofc(void);
-static int readc(void);
-static void unget(int c);
-static void ioecho(char c);
-
-
-/*
- * IO control
- */
-static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
-#define PUSHIO(what,arg,gen) ((temparg.what = (arg)), pushio(&temparg, (gen)))
-static int remap(int fd);
-static int openpipe(int *pv);
-static void closepipe(int *pv);
-static struct io *setbase(struct io *ip);
-
-/* -------- word.h -------- */
-
-#define NSTART 16 /* default number of words to allow for initially */
-
-struct wdblock {
- short w_bsize;
- short w_nword;
- /* bounds are arbitrary */
- char *w_words[1];
-};
-
-static struct wdblock *addword(char *wd, struct wdblock *wb);
-static struct wdblock *newword(int nw);
-static char **getwords(struct wdblock *wb);
-
-/* -------- misc stuff -------- */
-
-static int dolabel(struct op *t, char **args);
-static int dohelp(struct op *t, char **args);
-static int dochdir(struct op *t, char **args);
-static int doshift(struct op *t, char **args);
-static int dologin(struct op *t, char **args);
-static int doumask(struct op *t, char **args);
-static int doexec(struct op *t, char **args);
-static int dodot(struct op *t, char **args);
-static int dowait(struct op *t, char **args);
-static int doread(struct op *t, char **args);
-static int doeval(struct op *t, char **args);
-static int dotrap(struct op *t, char **args);
-static int dobreak(struct op *t, char **args);
-static int doexit(struct op *t, char **args);
-static int doexport(struct op *t, char **args);
-static int doreadonly(struct op *t, char **args);
-static int doset(struct op *t, char **args);
-static int dotimes(struct op *t, char **args);
-static int docontinue(struct op *t, char **args);
-
-static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp);
-static int execute(struct op *t, int *pin, int *pout, int no_fork);
-static int iosetup(struct ioword *iop, int pipein, int pipeout);
-static void brkset(struct brkcon *bc);
-static int getsig(char *s);
-static void setsig(int n, sighandler_t f);
-static int getn(char *as);
-static int brkcontin(char *cp, int val);
-static void rdexp(char **wp, void (*f) (struct var *), int key);
-static void badid(char *s);
-static void varput(char *s, int out);
-static int expand(const char *cp, struct wdblock **wbp, int f);
-static char *blank(int f);
-static int dollar(int quoted);
-static int grave(int quoted);
-static void globname(char *we, char *pp);
-static char *generate(char *start1, char *end1, char *middle, char *end);
-static int anyspcl(struct wdblock *wb);
-static void readhere(char **name, char *s, int ec);
-static int xxchar(struct ioarg *ap);
-
-struct here {
- char *h_tag;
- char h_dosub;
- struct ioword *h_iop;
- struct here *h_next;
-};
-
-static const char *const signame[] = {
- "Signal 0",
- "Hangup",
- NULL, /* interrupt */
- "Quit",
- "Illegal instruction",
- "Trace/BPT trap",
- "Abort",
- "Bus error",
- "Floating Point Exception",
- "Killed",
- "SIGUSR1",
- "SIGSEGV",
- "SIGUSR2",
- NULL, /* broken pipe */
- "Alarm clock",
- "Terminated"
-};
-
-
-typedef int (*builtin_func_ptr)(struct op *, char **);
-
-struct builtincmd {
- const char *name;
- builtin_func_ptr builtinfunc;
-};
-
-static const struct builtincmd builtincmds[] = {
- { "." , dodot },
- { ":" , dolabel },
- { "break" , dobreak },
- { "cd" , dochdir },
- { "continue", docontinue },
- { "eval" , doeval },
- { "exec" , doexec },
- { "exit" , doexit },
- { "export" , doexport },
- { "help" , dohelp },
- { "login" , dologin },
- { "newgrp" , dologin },
- { "read" , doread },
- { "readonly", doreadonly },
- { "set" , doset },
- { "shift" , doshift },
- { "times" , dotimes },
- { "trap" , dotrap },
- { "umask" , doumask },
- { "wait" , dowait },
- { NULL , NULL },
-};
-
-static struct op *dowholefile(int /*, int*/);
-
-
-/* Globals */
-static char **dolv;
-static int dolc;
-static uint8_t exstat;
-static smallint gflg; /* (seems to be a parse error indicator) */
-static smallint interactive; /* Is this an interactive shell */
-static smallint execflg;
-static smallint isbreak; /* "break" statement was seen */
-static int multiline; /* '\n' changed to ';' (counter) */
-static struct op *outtree; /* result from parser */
-static xint *failpt;
-static xint *errpt;
-static struct brkcon *brklist;
-static struct wdblock *wdlist;
-static struct wdblock *iolist;
-
-#ifdef MSHDEBUG
-static struct var *mshdbg_var;
-#endif
-static struct var *vlist; /* dictionary */
-static struct var *homedir; /* home directory */
-static struct var *prompt; /* main prompt */
-static struct var *cprompt; /* continuation prompt */
-static struct var *path; /* search path for commands */
-static struct var *shell; /* shell to interpret command files */
-static struct var *ifs; /* field separators */
-
-static int areanum; /* current allocation area */
-static smallint intr; /* interrupt pending (bool) */
-static smallint heedint = 1; /* heed interrupt signals (bool) */
-static int inparse;
-static char *null = (char*)""; /* null value for variable */
-static void (*qflag)(int) = SIG_IGN;
-static int startl;
-static int peeksym;
-static int nlseen;
-static int iounit = IODEFAULT;
-static YYSTYPE yylval;
-static char *elinep; /* done in main(): = line + sizeof(line) - 5 */
-
-static struct here *inhere; /* list of hear docs while parsing */
-static struct here *acthere; /* list of active here documents */
-static struct region *areabot; /* bottom of area */
-static struct region *areatop; /* top of area */
-static struct region *areanxt; /* starting point of scan */
-static void *brktop;
-static void *brkaddr;
-
-#define AFID_NOBUF (~0)
-#define AFID_ID 0
-
-
-/*
- * parsing & execution environment
- */
-struct env {
- char *linep;
- struct io *iobase;
- struct io *iop;
- xint *errpt; /* void * */
- int iofd;
- struct env *oenv;
-};
-
-
-struct globals {
- struct env global_env;
- struct ioarg temparg; // = { .afid = AFID_NOBUF }; /* temporary for PUSHIO */
- unsigned bufid; // = AFID_ID; /* buffer id counter */
- char ourtrap[_NSIG + 1];
- char *trap[_NSIG + 1];
- struct iobuf sharedbuf; /* in main(): set to { AFID_NOBUF } */
- struct iobuf mainbuf; /* in main(): set to { AFID_NOBUF } */
- struct ioarg ioargstack[NPUSH];
- /*
- * flags:
- * -e: quit on error
- * -k: look for name=value everywhere on command line
- * -n: no execution
- * -t: exit after reading and executing one command
- * -v: echo as read
- * -x: trace
- * -u: unset variables net diagnostic
- */
- char flags['z' - 'a' + 1];
- char filechar_cmdbuf[BUFSIZ];
- char line[LINELIM];
- char child_cmd[LINELIM];
-
- struct io iostack[NPUSH];
-
- char grave__var_name[LINELIM];
- char grave__alt_value[LINELIM];
-};
-
-#define G (*ptr_to_globals)
-#define global_env (G.global_env )
-#define temparg (G.temparg )
-#define bufid (G.bufid )
-#define ourtrap (G.ourtrap )
-#define trap (G.trap )
-#define sharedbuf (G.sharedbuf )
-#define mainbuf (G.mainbuf )
-#define ioargstack (G.ioargstack )
-/* this looks weird, but is OK ... we index FLAG with 'a'...'z' */
-#define FLAG (G.flags - 'a' )
-#define filechar_cmdbuf (G.filechar_cmdbuf)
-#define line (G.line )
-#define child_cmd (G.child_cmd )
-#define iostack (G.iostack )
-#define INIT_G() do { \
- SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
- global_env.linep = line; \
- global_env.iobase = iostack; \
- global_env.iop = iostack - 1; \
- global_env.iofd = FDBASE; \
- temparg.afid = AFID_NOBUF; \
- bufid = AFID_ID; \
-} while (0)
-
-
-/* in substitution */
-#define INSUB() (global_env.iop->task == XGRAVE || global_env.iop->task == XDOLL)
-
-#define RUN(what, arg, gen) ((temparg.what = (arg)), run(&temparg, (gen)))
-
-#ifdef MSHDEBUG
-static void print_tree(struct op *head)
-{
- if (head == NULL) {
- DBGPRINTF(("PRINT_TREE: no tree\n"));
- return;
- }
-
- DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left,
- head->right));
-
- if (head->left)
- print_tree(head->left);
-
- if (head->right)
- print_tree(head->right);
-}
-#endif /* MSHDEBUG */
-
-
-/*
- * IO functions
- */
-static void prs(const char *s)
-{
- if (*s)
- xwrite_str(STDERR_FILENO, s);
-}
-
-static void prn(unsigned u)
-{
- prs(itoa(u));
-}
-
-static void echo(char **wp)
-{
- int i;
-
- prs("+");
- for (i = 0; wp[i]; i++) {
- if (i)
- prs(" ");
- prs(wp[i]);
- }
- prs("\n");
-}
-
-static void closef(int i)
-{
- if (i > 2)
- close(i);
-}
-
-static void closeall(void)
-{
- int u;
-
- for (u = NUFILE; u < NOFILE;)
- close(u++);
-}
-
-
-/* fail but return to process next command */
-static void fail(void) NORETURN;
-static void fail(void)
-{
- longjmp(failpt, 1);
- /* NOTREACHED */
-}
-
-/* abort shell (or fail in subshell) */
-static void leave(void) NORETURN;
-static void leave(void)
-{
- DBGPRINTF(("LEAVE: leave called!\n"));
-
- if (execflg)
- fail();
- scraphere();
- freehere(1);
- runtrap(0);
- _exit(exstat);
- /* NOTREACHED */
-}
-
-static void warn(const char *s)
-{
- if (*s) {
- prs(s);
- if (!exstat)
- exstat = 255;
- }
- prs("\n");
- if (FLAG['e'])
- leave();
-}
-
-static void err(const char *s)
-{
- warn(s);
- if (FLAG['n'])
- return;
- if (!interactive)
- leave();
- if (global_env.errpt)
- longjmp(global_env.errpt, 1);
- closeall();
- global_env.iop = global_env.iobase = iostack;
-}
-
-
-/* -------- area.c -------- */
-
-/*
- * All memory between (char *)areabot and (char *)(areatop+1) is
- * exclusively administered by the area management routines.
- * It is assumed that sbrk() and brk() manipulate the high end.
- */
-
-#define sbrk(X) ({ \
- void * __q = (void *)-1; \
- if (brkaddr + (int)(X) < brktop) { \
- __q = brkaddr; \
- brkaddr += (int)(X); \
- } \
- __q; \
-})
-
-static void initarea(void)
-{
- brkaddr = xmalloc(AREASIZE);
- brktop = brkaddr + AREASIZE;
-
- while ((long) sbrk(0) & ALIGN)
- sbrk(1);
- areabot = (struct region *) sbrk(REGSIZE);
-
- areabot->next = areabot;
- areabot->area = BUSY;
- areatop = areabot;
- areanxt = areabot;
-}
-
-static char *getcell(unsigned nbytes)
-{
- int nregio;
- struct region *p, *q;
- int i;
-
- if (nbytes == 0) {
- puts("getcell(0)");
- abort();
- }
- /* silly and defeats the algorithm */
- /*
- * round upwards and add administration area
- */
- nregio = (nbytes + (REGSIZE - 1)) / REGSIZE + 1;
- p = areanxt;
- for (;;) {
- if (p->area > areanum) {
- /*
- * merge free cells
- */
- while ((q = p->next)->area > areanum && q != areanxt)
- p->next = q->next;
- /*
- * exit loop if cell big enough
- */
- if (q >= p + nregio)
- goto found;
- }
- p = p->next;
- if (p == areanxt)
- break;
- }
- i = nregio >= GROWBY ? nregio : GROWBY;
- p = (struct region *) sbrk(i * REGSIZE);
- if (p == (struct region *) -1)
- return NULL;
- p--;
- if (p != areatop) {
- puts("not contig");
- abort(); /* allocated areas are contiguous */
- }
- q = p + i;
- p->next = q;
- p->area = FREE;
- q->next = areabot;
- q->area = BUSY;
- areatop = q;
- found:
- /*
- * we found a FREE area big enough, pointed to by 'p', and up to 'q'
- */
- areanxt = p + nregio;
- if (areanxt < q) {
- /*
- * split into requested area and rest
- */
- if (areanxt + 1 > q) {
- puts("OOM");
- abort(); /* insufficient space left for admin */
- }
- areanxt->next = q;
- areanxt->area = FREE;
- p->next = areanxt;
- }
- p->area = areanum;
- return (char *) (p + 1);
-}
-
-static void freecell(char *cp)
-{
- struct region *p;
-
- p = (struct region *) cp;
- if (p != NULL) {
- p--;
- if (p < areanxt)
- areanxt = p;
- p->area = FREE;
- }
-}
-#define DELETE(obj) freecell((char *)obj)
-
-static void freearea(int a)
-{
- struct region *p, *top;
-
- top = areatop;
- for (p = areabot; p != top; p = p->next)
- if (p->area >= a)
- p->area = FREE;
-}
-
-static void setarea(char *cp, int a)
-{
- struct region *p;
-
- p = (struct region *) cp;
- if (p != NULL)
- (p - 1)->area = a;
-}
-
-static int getarea(char *cp)
-{
- return ((struct region *) cp - 1)->area;
-}
-
-static void garbage(void)
-{
- struct region *p, *q, *top;
-
- top = areatop;
- for (p = areabot; p != top; p = p->next) {
- if (p->area > areanum) {
- while ((q = p->next)->area > areanum)
- p->next = q->next;
- areanxt = p;
- }
- }
-#ifdef SHRINKBY
- if (areatop >= q + SHRINKBY && q->area > areanum) {
- brk((char *) (q + 1));
- q->next = areabot;
- q->area = BUSY;
- areatop = q;
- }
-#endif
-}
-
-static void *get_space(int n)
-{
- char *cp;
-
- cp = getcell(n);
- if (cp == NULL)
- err("out of string space");
- return cp;
-}
-
-static char *strsave(const char *s, int a)
-{
- char *cp;
-
- cp = get_space(strlen(s) + 1);
- if (cp == NULL) {
-// FIXME: I highly doubt this is good.
- return (char*)"";
- }
- setarea(cp, a);
- strcpy(cp, s);
- return cp;
-}
-
-
-/* -------- var.c -------- */
-
-static int eqname(const char *n1, const char *n2)
-{
- for (; *n1 != '=' && *n1 != '\0'; n1++)
- if (*n2++ != *n1)
- return 0;
- return *n2 == '\0' || *n2 == '=';
-}
-
-static const char *findeq(const char *cp)
-{
- while (*cp != '\0' && *cp != '=')
- cp++;
- return cp;
-}
-
-/*
- * Find the given name in the dictionary
- * and return its value. If the name was
- * not previously there, enter it now and
- * return a null value.
- */
-static struct var *lookup(const char *n)
-{
-// FIXME: dirty hack
- static struct var dummy;
-
- struct var *vp;
- const char *cp;
- char *xp;
- int c;
-
- if (isdigit(*n)) {
- dummy.name = (char*)n;
- for (c = 0; isdigit(*n) && c < 1000; n++)
- c = c * 10 + *n - '0';
- dummy.status = RONLY;
- dummy.value = (c <= dolc ? dolv[c] : null);
- return &dummy;
- }
-
- for (vp = vlist; vp; vp = vp->next)
- if (eqname(vp->name, n))
- return vp;
-
- cp = findeq(n);
- vp = get_space(sizeof(*vp));
- if (vp == 0 || (vp->name = get_space((int) (cp - n) + 2)) == NULL) {
- dummy.name = dummy.value = (char*)"";
- return &dummy;
- }
-
- xp = vp->name;
- while ((*xp = *n++) != '\0' && *xp != '=')
- xp++;
- *xp++ = '=';
- *xp = '\0';
- setarea((char *) vp, 0);
- setarea((char *) vp->name, 0);
- vp->value = null;
- vp->next = vlist;
- vp->status = GETCELL;
- vlist = vp;
- return vp;
-}
-
-/*
- * if name is not NULL, it must be
- * a prefix of the space `val',
- * and end with `='.
- * this is all so that exporting
- * values is reasonably painless.
- */
-static void nameval(struct var *vp, const char *val, const char *name)
-{
- const char *cp;
- char *xp;
- int fl;
-
- if (vp->status & RONLY) {
- xp = vp->name;
- while (*xp && *xp != '=')
- fputc(*xp++, stderr);
- err(" is read-only");
- return;
- }
- fl = 0;
- if (name == NULL) {
- xp = get_space(strlen(vp->name) + strlen(val) + 2);
- if (xp == NULL)
- return;
- /* make string: name=value */
- setarea(xp, 0);
- name = xp;
- cp = vp->name;
- while ((*xp = *cp++) != '\0' && *xp != '=')
- xp++;
- *xp++ = '=';
- strcpy(xp, val);
- val = xp;
- fl = GETCELL;
- }
- if (vp->status & GETCELL)
- freecell(vp->name); /* form new string `name=value' */
- vp->name = (char*)name;
- vp->value = (char*)val;
- vp->status |= fl;
-}
-
-/*
- * give variable at `vp' the value `val'.
- */
-static void setval(struct var *vp, const char *val)
-{
- nameval(vp, val, NULL);
-}
-
-static void export(struct var *vp)
-{
- vp->status |= EXPORT;
-}
-
-static void ronly(struct var *vp)
-{
- if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */
- vp->status |= RONLY;
-}
-
-static int isassign(const char *s)
-{
- unsigned char c;
- DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
-
- c = *s;
- /* no isalpha() - we shouldn't use locale */
- /* c | 0x20 - lowercase (Latin) letters */
- if (c != '_' && (unsigned)((c|0x20) - 'a') > 25)
- /* not letter */
- return 0;
-
- while (1) {
- c = *++s;
- if (c == '=')
- return 1;
- if (c == '\0')
- return 0;
- if (c != '_'
- && (unsigned)(c - '0') > 9 /* not number */
- && (unsigned)((c|0x20) - 'a') > 25 /* not letter */
- ) {
- return 0;
- }
- }
-}
-
-static int assign(const char *s, int cf)
-{
- const char *cp;
- struct var *vp;
-
- DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
-
- if (!isalpha(*s) && *s != '_')
- return 0;
- for (cp = s; *cp != '='; cp++)
- if (*cp == '\0' || (!isalnum(*cp) && *cp != '_'))
- return 0;
- vp = lookup(s);
- nameval(vp, ++cp, cf == COPYV ? NULL : s);
- if (cf != COPYV)
- vp->status &= ~GETCELL;
- return 1;
-}
-
-static int checkname(char *cp)
-{
- DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
-
- if (!isalpha(*cp++) && *(cp - 1) != '_')
- return 0;
- while (*cp)
- if (!isalnum(*cp++) && *(cp - 1) != '_')
- return 0;
- return 1;
-}
-
-static void putvlist(int f, int out)
-{
- struct var *vp;
-
- for (vp = vlist; vp; vp = vp->next) {
- if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
- if (vp->status & EXPORT)
- write(out, "export ", 7);
- if (vp->status & RONLY)
- write(out, "readonly ", 9);
- write(out, vp->name, (int) (findeq(vp->name) - vp->name));
- write(out, "\n", 1);
- }
- }
-}
-
-
-/*
- * trap handling
- */
-static void sig(int i)
-{
- trapset = i;
- signal(i, sig);
-}
-
-static void runtrap(int i)
-{
- char *trapstr;
-
- trapstr = trap[i];
- if (trapstr == NULL)
- return;
-
- if (i == 0)
- trap[i] = NULL;
-
- RUN(aword, trapstr, nlchar);
-}
-
-
-static void setdash(void)
-{
- char *cp;
- int c;
- char m['z' - 'a' + 1];
-
- cp = m;
- for (c = 'a'; c <= 'z'; c++)
- if (FLAG[c])
- *cp++ = c;
- *cp = '\0';
- setval(lookup("-"), m);
-}
-
-static int newfile(char *s)
-{
- int f;
-
- DBGPRINTF7(("NEWFILE: opening %s\n", s));
-
- f = 0;
- if (NOT_LONE_DASH(s)) {
- DBGPRINTF(("NEWFILE: s is %s\n", s));
- f = open(s, O_RDONLY);
- if (f < 0) {
- prs(s);
- err(": can't open");
- return 1;
- }
- }
-
- next(remap(f));
- return 0;
-}
-
-
-#ifdef UNUSED
-struct op *scantree(struct op *head)
-{
- struct op *dotnode;
-
- if (head == NULL)
- return NULL;
-
- if (head->left != NULL) {
- dotnode = scantree(head->left);
- if (dotnode)
- return dotnode;
- }
-
- if (head->right != NULL) {
- dotnode = scantree(head->right);
- if (dotnode)
- return dotnode;
- }
-
- if (head->op_words == NULL)
- return NULL;
-
- DBGPRINTF5(("SCANTREE: checking node %p\n", head));
-
- if ((head->op_type != TDOT) && LONE_CHAR(head->op_words[0], '.')) {
- DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
- return head;
- }
-
- return NULL;
-}
-#endif
-
-
-static void onecommand(void)
-{
- int i;
- jmp_buf m1;
-
- DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree));
-
- while (global_env.oenv)
- quitenv();
-
- areanum = 1;
- freehere(areanum);
- freearea(areanum);
- garbage();
- wdlist = NULL;
- iolist = NULL;
- global_env.errpt = NULL;
- global_env.linep = line;
- yynerrs = 0;
- multiline = 0;
- inparse = 1;
- intr = 0;
- execflg = 0;
-
- failpt = m1;
- setjmp(failpt); /* Bruce Evans' fix */
- failpt = m1;
- if (setjmp(failpt) || yyparse() || intr) {
- DBGPRINTF(("ONECOMMAND: this is not good.\n"));
-
- while (global_env.oenv)
- quitenv();
- scraphere();
- if (!interactive && intr)
- leave();
- inparse = 0;
- intr = 0;
- return;
- }
-
- inparse = 0;
- brklist = 0;
- intr = 0;
- execflg = 0;
-
- if (!FLAG['n']) {
- DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n",
- outtree));
- execute(outtree, NOPIPE, NOPIPE, /* no_fork: */ 0);
- }
-
- if (!interactive && intr) {
- execflg = 0;
- leave();
- }
-
- i = trapset;
- if (i != 0) {
- trapset = 0;
- runtrap(i);
- }
-}
-
-static int newenv(int f)
-{
- struct env *ep;
-
- DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
-
- if (f) {
- quitenv();
- return 1;
- }
-
- ep = get_space(sizeof(*ep));
- if (ep == NULL) {
- while (global_env.oenv)
- quitenv();
- fail();
- }
- *ep = global_env;
- global_env.oenv = ep;
- global_env.errpt = errpt;
-
- return 0;
-}
-
-static void quitenv(void)
-{
- struct env *ep;
- int fd;
-
- DBGPRINTF(("QUITENV: global_env.oenv=%p\n", global_env.oenv));
-
- ep = global_env.oenv;
- if (ep != NULL) {
- fd = global_env.iofd;
- global_env = *ep;
- /* should close `'d files */
- DELETE(ep);
- while (--fd >= global_env.iofd)
- close(fd);
- }
-}
-
-/*
- * Is character c in s?
- */
-static int any(int c, const char *s)
-{
- while (*s)
- if (*s++ == c)
- return 1;
- return 0;
-}
-
-/*
- * Is any character from s1 in s2?
- */
-static int anys(const char *s1, const char *s2)
-{
- while (*s1)
- if (any(*s1++, s2))
- return 1;
- return 0;
-}
-
-static char *putn(int n)
-{
- return itoa(n);
-}
-
-static void next(int f)
-{
- PUSHIO(afile, f, filechar);
-}
-
-static void onintr(int s UNUSED_PARAM) /* ANSI C requires a parameter */
-{
- signal(SIGINT, onintr);
- intr = 1;
- if (interactive) {
- if (inparse) {
- prs("\n");
- fail();
- }
- } else if (heedint) {
- execflg = 0;
- leave();
- }
-}
-
-
-/* -------- gmatch.c -------- */
-/*
- * int gmatch(string, pattern)
- * char *string, *pattern;
- *
- * Match a pattern as in sh(1).
- */
-
-#define CMASK 0377
-#define QUOTE 0200
-#define QMASK (CMASK & ~QUOTE)
-#define NOT '!' /* might use ^ */
-
-static const char *cclass(const char *p, int sub)
-{
- int c, d, not, found;
-
- not = (*p == NOT);
- if (not != 0)
- p++;
- found = not;
- do {
- if (*p == '\0')
- return NULL;
- c = *p & CMASK;
- if (p[1] == '-' && p[2] != ']') {
- d = p[2] & CMASK;
- p++;
- } else
- d = c;
- if (c == sub || (c <= sub && sub <= d))
- found = !not;
- } while (*++p != ']');
- return found ? p + 1 : NULL;
-}
-
-static int gmatch(const char *s, const char *p)
-{
- int sc, pc;
-
- if (s == NULL || p == NULL)
- return 0;
-
- while ((pc = *p++ & CMASK) != '\0') {
- sc = *s++ & QMASK;
- switch (pc) {
- case '[':
- p = cclass(p, sc);
- if (p == NULL)
- return 0;
- break;
-
- case '?':
- if (sc == 0)
- return 0;
- break;
-
- case '*':
- s--;
- do {
- if (*p == '\0' || gmatch(s, p))
- return 1;
- } while (*s++ != '\0');
- return 0;
-
- default:
- if (sc != (pc & ~QUOTE))
- return 0;
- }
- }
- return *s == '\0';
-}
-
-
-/* -------- csyn.c -------- */
-/*
- * shell: syntax (C version)
- */
-
-static void yyerror(const char *s) NORETURN;
-static void yyerror(const char *s)
-{
- yynerrs = 1;
- if (interactive && global_env.iop <= iostack) {
- multiline = 0;
- while (eofc() == 0 && yylex(0) != '\n')
- continue;
- }
- err(s);
- fail();
-}
-
-static void zzerr(void) NORETURN;
-static void zzerr(void)
-{
- yyerror("syntax error");
-}
-
-int yyparse(void)
-{
- DBGPRINTF7(("YYPARSE: enter...\n"));
-
- startl = 1;
- peeksym = 0;
- yynerrs = 0;
- outtree = c_list();
- musthave('\n', 0);
- return yynerrs; /* 0/1 */
-}
-
-static struct op *pipeline(int cf)
-{
- struct op *t, *p;
- int c;
-
- DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
-
- t = command(cf);
-
- DBGPRINTF9(("PIPELINE: t=%p\n", t));
-
- if (t != NULL) {
- while ((c = yylex(0)) == '|') {
- p = command(CONTIN);
- if (p == NULL) {
- DBGPRINTF8(("PIPELINE: error!\n"));
- zzerr();
- }
-
- if (t->op_type != TPAREN && t->op_type != TCOM) {
- /* shell statement */
- t = block(TPAREN, t, NOBLOCK, NOWORDS);
- }
-
- t = block(TPIPE, t, p, NOWORDS);
- }
- peeksym = c;
- }
-
- DBGPRINTF7(("PIPELINE: returning t=%p\n", t));
- return t;
-}
-
-static struct op *andor(void)
-{
- struct op *t, *p;
- int c;
-
- DBGPRINTF7(("ANDOR: enter...\n"));
-
- t = pipeline(0);
-
- DBGPRINTF9(("ANDOR: t=%p\n", t));
-
- if (t != NULL) {
- while ((c = yylex(0)) == LOGAND || c == LOGOR) {
- p = pipeline(CONTIN);
- if (p == NULL) {
- DBGPRINTF8(("ANDOR: error!\n"));
- zzerr();
- }
-
- t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
- }
-
- peeksym = c;
- }
-
- DBGPRINTF7(("ANDOR: returning t=%p\n", t));
- return t;
-}
-
-static struct op *c_list(void)
-{
- struct op *t, *p;
- int c;
-
- DBGPRINTF7(("C_LIST: enter...\n"));
-
- t = andor();
-
- if (t != NULL) {
- peeksym = yylex(0);
- if (peeksym == '&')
- t = block(TASYNC, t, NOBLOCK, NOWORDS);
-
- while ((c = yylex(0)) == ';' || c == '&'
- || (multiline && c == '\n')
- ) {
- p = andor();
- if (p== NULL)
- return t;
-
- peeksym = yylex(0);
- if (peeksym == '&')
- p = block(TASYNC, p, NOBLOCK, NOWORDS);
-
- t = list(t, p);
- } /* WHILE */
-
- peeksym = c;
- }
- /* IF */
- DBGPRINTF7(("C_LIST: returning t=%p\n", t));
- return t;
-}
-
-static int synio(int cf)
-{
- struct ioword *iop;
- int i;
- int c;
-
- DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
-
- c = yylex(cf);
- if (c != '<' && c != '>') {
- peeksym = c;
- return 0;
- }
-
- i = yylval.i;
- musthave(WORD, 0);
- iop = io(iounit, i, yylval.cp);
- iounit = IODEFAULT;
-
- if (i & IOHERE)
- markhere(yylval.cp, iop);
-
- DBGPRINTF7(("SYNIO: returning 1\n"));
- return 1;
-}
-
-static void musthave(int c, int cf)
-{
- peeksym = yylex(cf);
- if (peeksym != c) {
- DBGPRINTF7(("MUSTHAVE: error!\n"));
- zzerr();
- }
-
- peeksym = 0;
-}
-
-static struct op *simple(void)
-{
- struct op *t;
-
- t = NULL;
- for (;;) {
- switch (peeksym = yylex(0)) {
- case '<':
- case '>':
- (void) synio(0);
- break;
-
- case WORD:
- if (t == NULL) {
- t = newtp();
- t->op_type = TCOM;
- }
- peeksym = 0;
- word(yylval.cp);
- break;
-
- default:
- return t;
- }
- }
-}
-
-static struct op *nested(int type, int mark)
-{
- struct op *t;
-
- DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
-
- multiline++;
- t = c_list();
- musthave(mark, 0);
- multiline--;
- return block(type, t, NOBLOCK, NOWORDS);
-}
-
-static struct op *command(int cf)
-{
- struct op *t;
- struct wdblock *iosave;
- int c;
-
- DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
-
- iosave = iolist;
- iolist = NULL;
-
- if (multiline)
- cf |= CONTIN;
-
- while (synio(cf))
- cf = 0;
-
- c = yylex(cf);
-
- switch (c) {
- default:
- peeksym = c;
- t = simple();
- if (t == NULL) {
- if (iolist == NULL)
- return NULL;
- t = newtp();
- t->op_type = TCOM;
- }
- break;
-
- case '(':
- t = nested(TPAREN, ')');
- break;
-
- case '{':
- t = nested(TBRACE, '}');
- break;
-
- case FOR:
- t = newtp();
- t->op_type = TFOR;
- musthave(WORD, 0);
- startl = 1;
- t->str = yylval.cp;
- multiline++;
- t->op_words = wordlist();
- c = yylex(0);
- if (c != '\n' && c != ';')
- peeksym = c;
- t->left = dogroup(0);
- multiline--;
- break;
-
- case WHILE:
- case UNTIL:
- multiline++;
- t = newtp();
- t->op_type = (c == WHILE ? TWHILE : TUNTIL);
- t->left = c_list();
- t->right = dogroup(1);
- /* t->op_words = NULL; - newtp() did this */
- multiline--;
- break;
-
- case CASE:
- t = newtp();
- t->op_type = TCASE;
- musthave(WORD, 0);
- t->str = yylval.cp;
- startl++;
- multiline++;
- musthave(IN, CONTIN);
- startl++;
-
- t->left = caselist();
-
- musthave(ESAC, 0);
- multiline--;
- break;
-
- case IF:
- multiline++;
- t = newtp();
- t->op_type = TIF;
- t->left = c_list();
- t->right = thenpart();
- musthave(FI, 0);
- multiline--;
- break;
-
- case DOT:
- t = newtp();
- t->op_type = TDOT;
-
- musthave(WORD, 0); /* gets name of file */
- DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
-
- word(yylval.cp); /* add word to wdlist */
- word(NOWORD); /* terminate wdlist */
- t->op_words = copyw(); /* dup wdlist */
- break;
-
- }
-
- while (synio(0))
- continue;
-
- t = namelist(t);
- iolist = iosave;
-
- DBGPRINTF(("COMMAND: returning %p\n", t));
-
- return t;
-}
-
-static struct op *dowholefile(int type /*, int mark*/)
-{
- struct op *t;
-
- DBGPRINTF(("DOWHOLEFILE: enter, type=%d\n", type /*, mark*/));
-
- multiline++;
- t = c_list();
- multiline--;
- t = block(type, t, NOBLOCK, NOWORDS);
- DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t));
- return t;
-}
-
-static struct op *dogroup(int onlydone)
-{
- int c;
- struct op *mylist;
-
- c = yylex(CONTIN);
- if (c == DONE && onlydone)
- return NULL;
- if (c != DO)
- zzerr();
- mylist = c_list();
- musthave(DONE, 0);
- return mylist;
-}
-
-static struct op *thenpart(void)
-{
- int c;
- struct op *t;
-
- c = yylex(0);
- if (c != THEN) {
- peeksym = c;
- return NULL;
- }
- t = newtp();
- /*t->op_type = 0; - newtp() did this */
- t->left = c_list();
- if (t->left == NULL)
- zzerr();
- t->right = elsepart();
- return t;
-}
-
-static struct op *elsepart(void)
-{
- int c;
- struct op *t;
-
- switch (c = yylex(0)) {
- case ELSE:
- t = c_list();
- if (t == NULL)
- zzerr();
- return t;
-
- case ELIF:
- t = newtp();
- t->op_type = TELIF;
- t->left = c_list();
- t->right = thenpart();
- return t;
-
- default:
- peeksym = c;
- return NULL;
- }
-}
-
-static struct op *caselist(void)
-{
- struct op *t;
-
- t = NULL;
- while ((peeksym = yylex(CONTIN)) != ESAC) {
- DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
- t = list(t, casepart());
- }
-
- DBGPRINTF(("CASELIST, returning t=%p\n", t));
- return t;
-}
-
-static struct op *casepart(void)
-{
- struct op *t;
-
- DBGPRINTF7(("CASEPART: enter...\n"));
-
- t = newtp();
- t->op_type = TPAT;
- t->op_words = pattern();
- musthave(')', 0);
- t->left = c_list();
- peeksym = yylex(CONTIN);
- if (peeksym != ESAC)
- musthave(BREAK, CONTIN);
-
- DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t));
-
- return t;
-}
-
-static char **pattern(void)
-{
- int c, cf;
-
- cf = CONTIN;
- do {
- musthave(WORD, cf);
- word(yylval.cp);
- cf = 0;
- c = yylex(0);
- } while (c == '|');
- peeksym = c;
- word(NOWORD);
-
- return copyw();
-}
-
-static char **wordlist(void)
-{
- int c;
-
- c = yylex(0);
- if (c != IN) {
- peeksym = c;
- return NULL;
- }
- startl = 0;
- while ((c = yylex(0)) == WORD)
- word(yylval.cp);
- word(NOWORD);
- peeksym = c;
- return copyw();
-}
-
-/*
- * supporting functions
- */
-static struct op *list(struct op *t1, struct op *t2)
-{
- DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2));
-
- if (t1 == NULL)
- return t2;
- if (t2 == NULL)
- return t1;
-
- return block(TLIST, t1, t2, NOWORDS);
-}
-
-static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
-{
- struct op *t;
-
- DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
-
- t = newtp();
- t->op_type = type;
- t->left = t1;
- t->right = t2;
- t->op_words = wp;
-
- DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1, t2));
-
- return t;
-}
-
-/* See if given string is a shell multiline (FOR, IF, etc) */
-static int rlookup(char *n)
-{
- struct res {
- char r_name[6];
- int16_t r_val;
- };
- static const struct res restab[] = {
- { "for" , FOR },
- { "case" , CASE },
- { "esac" , ESAC },
- { "while", WHILE },
- { "do" , DO },
- { "done" , DONE },
- { "if" , IF },
- { "in" , IN },
- { "then" , THEN },
- { "else" , ELSE },
- { "elif" , ELIF },
- { "until", UNTIL },
- { "fi" , FI },
- { ";;" , BREAK },
- { "||" , LOGOR },
- { "&&" , LOGAND },
- { "{" , '{' },
- { "}" , '}' },
- { "." , DOT },
- { "" , 0 },
- };
-
- const struct res *rp;
-
- DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
-
- for (rp = restab; rp->r_name[0]; rp++)
- if (strcmp(rp->r_name, n) == 0) {
- DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
- return rp->r_val; /* Return numeric code for shell multiline */
- }
-
- DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
- return 0; /* Not a shell multiline */
-}
-
-static struct op *newtp(void)
-{
- struct op *t;
-
- t = (struct op *) tree(sizeof(*t));
- memset(t, 0, sizeof(*t));
-
- DBGPRINTF3(("NEWTP: allocated %p\n", t));
-
- return t;
-}
-
-static struct op *namelist(struct op *t)
-{
- DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t,
- T_CMD_NAMES[t->op_type], iolist));
-
- if (iolist) {
- iolist = addword((char *) NULL, iolist);
- t->ioact = copyio();
- } else
- t->ioact = NULL;
-
- if (t->op_type != TCOM) {
- if (t->op_type != TPAREN && t->ioact != NULL) {
- t = block(TPAREN, t, NOBLOCK, NOWORDS);
- t->ioact = t->left->ioact;
- t->left->ioact = NULL;
- }
- return t;
- }
-
- word(NOWORD);
- t->op_words = copyw();
-
- return t;
-}
-
-static char **copyw(void)
-{
- char **wd;
-
- wd = getwords(wdlist);
- wdlist = NULL;
- return wd;
-}
-
-static void word(char *cp)
-{
- wdlist = addword(cp, wdlist);
-}
-
-static struct ioword **copyio(void)
-{
- struct ioword **iop;
-
- iop = (struct ioword **) getwords(iolist);
- iolist = NULL;
- return iop;
-}
-
-static struct ioword *io(int u, int f, char *cp)
-{
- struct ioword *iop;
-
- iop = (struct ioword *) tree(sizeof(*iop));
- iop->io_fd = u;
- iop->io_flag = f;
- iop->io_name = cp;
- iolist = addword((char *) iop, iolist);
- return iop;
-}
-
-static int yylex(int cf)
-{
- int c, c1;
- int atstart;
-
- c = peeksym;
- if (c > 0) {
- peeksym = 0;
- if (c == '\n')
- startl = 1;
- return c;
- }
-
- nlseen = 0;
- atstart = startl;
- startl = 0;
- yylval.i = 0;
- global_env.linep = line;
-
-/* MALAMO */
- line[LINELIM - 1] = '\0';
-
- loop:
- while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
- continue;
-
- switch (c) {
- default:
- if (any(c, "0123456789")) {
- c1 = my_getc(0);
- unget(c1);
- if (c1 == '<' || c1 == '>') {
- iounit = c - '0';
- goto loop;
- }
- *global_env.linep++ = c;
- c = c1;
- }
- break;
-
- case '#': /* Comment, skip to next newline or End-of-string */
- while ((c = my_getc(0)) != '\0' && c != '\n')
- continue;
- unget(c);
- goto loop;
-
- case 0:
- DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
- return c;
-
- case '$':
- DBGPRINTF9(("YYLEX: found $\n"));
- *global_env.linep++ = c;
- c = my_getc(0);
- if (c == '{') {
- c = collect(c, '}');
- if (c != '\0')
- return c;
- goto pack;
- }
- break;
-
- case '`':
- case '\'':
- case '"':
- c = collect(c, c);
- if (c != '\0')
- return c;
- goto pack;
-
- case '|':
- case '&':
- case ';':
- startl = 1;
- /* If more chars process them, else return NULL char */
- c1 = dual(c);
- if (c1 != '\0')
- return c1;
- return c;
-
- case '^':
- startl = 1;
- return '|';
- case '>':
- case '<':
- diag(c);
- return c;
-
- case '\n':
- nlseen++;
- gethere();
- startl = 1;
- if (multiline || cf & CONTIN) {
- if (interactive && global_env.iop <= iostack) {
-#if ENABLE_FEATURE_EDITING
- current_prompt = cprompt->value;
-#else
- prs(cprompt->value);
-#endif
- }
- if (cf & CONTIN)
- goto loop;
- }
- return c;
-
- case '(':
- case ')':
- startl = 1;
- return c;
- }
-
- unget(c);
-
- pack:
- while ((c = my_getc(0)) != '\0' && !any(c, "`$ '\"\t;&<>()|^\n")) {
- if (global_env.linep >= elinep)
- err("word too long");
- else
- *global_env.linep++ = c;
- };
-
- unget(c);
-
- if (any(c, "\"'`$"))
- goto loop;
-
- *global_env.linep++ = '\0';
-
- if (atstart) {
- c = rlookup(line);
- if (c != 0) {
- startl = 1;
- return c;
- }
- }
-
- yylval.cp = strsave(line, areanum);
- return WORD;
-}
-
-
-static int collect(int c, int c1)
-{
- char s[2];
-
- DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
-
- *global_env.linep++ = c;
- while ((c = my_getc(c1)) != c1) {
- if (c == 0) {
- unget(c);
- s[0] = c1;
- s[1] = 0;
- prs("no closing ");
- yyerror(s);
- return YYERRCODE;
- }
- if (interactive && c == '\n' && global_env.iop <= iostack) {
-#if ENABLE_FEATURE_EDITING
- current_prompt = cprompt->value;
-#else
- prs(cprompt->value);
-#endif
- }
- *global_env.linep++ = c;
- }
-
- *global_env.linep++ = c;
-
- DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
-
- return 0;
-}
-
-/* "multiline commands" helper func */
-/* see if next 2 chars form a shell multiline */
-static int dual(int c)
-{
- char s[3];
- char *cp = s;
-
- DBGPRINTF8(("DUAL: enter, c=%d\n", c));
-
- *cp++ = c; /* c is the given "peek" char */
- *cp++ = my_getc(0); /* get next char of input */
- *cp = '\0'; /* add EOS marker */
-
- c = rlookup(s); /* see if 2 chars form a shell multiline */
- if (c == 0)
- unget(*--cp); /* String is not a shell multiline, put peek char back */
-
- return c; /* String is multiline, return numeric multiline (restab) code */
-}
-
-static void diag(int ec)
-{
- int c;
-
- DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
-
- c = my_getc(0);
- if (c == '>' || c == '<') {
- if (c != ec)
- zzerr();
- yylval.i = (ec == '>' ? IOWRITE | IOCAT : IOHERE);
- c = my_getc(0);
- } else
- yylval.i = (ec == '>' ? IOWRITE : IOREAD);
- if (c != '&' || yylval.i == IOHERE)
- unget(c);
- else
- yylval.i |= IODUP;
-}
-
-static char *tree(unsigned size)
-{
- char *t;
-
- t = getcell(size);
- if (t == NULL) {
- DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
- prs("command line too complicated\n");
- fail();
- /* NOTREACHED */
- }
- return t;
-}
-
-
-/* VARARGS1 */
-/* ARGSUSED */
-
-/* -------- exec.c -------- */
-
-static struct op **find1case(struct op *t, const char *w)
-{
- struct op *t1;
- struct op **tp;
- char **wp;
- char *cp;
-
- if (t == NULL) {
- DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
- return NULL;
- }
-
- DBGPRINTF3(("FIND1CASE: enter, t->op_type=%d (%s)\n", t->op_type,
- T_CMD_NAMES[t->op_type]));
-
- if (t->op_type == TLIST) {
- tp = find1case(t->left, w);
- if (tp != NULL) {
- DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp));
- return tp;
- }
- t1 = t->right; /* TPAT */
- } else
- t1 = t;
-
- for (wp = t1->op_words; *wp;) {
- cp = evalstr(*wp++, DOSUB);
- if (cp && gmatch(w, cp)) {
- DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
- &t1->left));
- return &t1->left;
- }
- }
-
- DBGPRINTF(("FIND1CASE: returning NULL\n"));
- return NULL;
-}
-
-static struct op *findcase(struct op *t, const char *w)
-{
- struct op **tp;
-
- tp = find1case(t, w);
- return tp != NULL ? *tp : NULL;
-}
-
-/*
- * execute tree
- */
-
-static int execute(struct op *t, int *pin, int *pout, int no_fork)
-{
- struct op *t1;
- volatile int i, rv, a;
- const char *cp;
- char **wp, **wp2;
- struct var *vp;
- struct op *outtree_save;
- struct brkcon bc;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) ℘
-#endif
-
- if (t == NULL) {
- DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
- return 0;
- }
-
- DBGPRINTF(("EXECUTE: t=%p, t->op_type=%d (%s), t->op_words is %s\n", t,
- t->op_type, T_CMD_NAMES[t->op_type],
- ((t->op_words == NULL) ? "NULL" : t->op_words[0])));
-
- rv = 0;
- a = areanum++;
- wp2 = t->op_words;
- wp = (wp2 != NULL)
- ? eval(wp2, t->op_type == TCOM ? DOALL : DOALL & ~DOKEY)
- : NULL;
-
- switch (t->op_type) {
- case TDOT:
- DBGPRINTF3(("EXECUTE: TDOT\n"));
-
- outtree_save = outtree;
-
- newfile(evalstr(t->op_words[0], DOALL));
-
- t->left = dowholefile(TLIST /*, 0*/);
- t->right = NULL;
-
- outtree = outtree_save;
-
- if (t->left)
- rv = execute(t->left, pin, pout, /* no_fork: */ 0);
- if (t->right)
- rv = execute(t->right, pin, pout, /* no_fork: */ 0);
- break;
-
- case TPAREN:
- rv = execute(t->left, pin, pout, /* no_fork: */ 0);
- break;
-
- case TCOM:
- rv = forkexec(t, pin, pout, no_fork, wp);
- break;
-
- case TPIPE:
- {
- int pv[2];
-
- rv = openpipe(pv);
- if (rv < 0)
- break;
- pv[0] = remap(pv[0]);
- pv[1] = remap(pv[1]);
- (void) execute(t->left, pin, pv, /* no_fork: */ 0);
- rv = execute(t->right, pv, pout, /* no_fork: */ 0);
- }
- break;
-
- case TLIST:
- (void) execute(t->left, pin, pout, /* no_fork: */ 0);
- rv = execute(t->right, pin, pout, /* no_fork: */ 0);
- break;
-
- case TASYNC:
- {
- smallint hinteractive = interactive;
-
- DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
-
- i = vfork();
- if (i == 0) { /* child */
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
- if (interactive)
- signal(SIGTERM, SIG_DFL);
- interactive = 0;
- if (pin == NULL) {
- close(0);
- xopen(bb_dev_null, O_RDONLY);
- }
- _exit(execute(t->left, pin, pout, /* no_fork: */ 1));
- }
- interactive = hinteractive;
- if (i != -1) {
- setval(lookup("!"), putn(i));
- closepipe(pin);
- if (interactive) {
- prs(putn(i));
- prs("\n");
- }
- } else
- rv = -1;
- setstatus(rv);
- }
- break;
-
- case TOR:
- case TAND:
- rv = execute(t->left, pin, pout, /* no_fork: */ 0);
- t1 = t->right;
- if (t1 != NULL && (rv == 0) == (t->op_type == TAND))
- rv = execute(t1, pin, pout, /* no_fork: */ 0);
- break;
-
- case TFOR:
- if (wp == NULL) {
- wp = dolv + 1;
- i = dolc;
- if (i < 0)
- i = 0;
- } else {
- i = -1;
- while (*wp++ != NULL)
- continue;
- }
- vp = lookup(t->str);
- while (setjmp(bc.brkpt))
- if (isbreak)
- goto broken;
- /* Restore areanum value. It may be incremented by execute()
- * below, and then "continue" may jump back to setjmp above */
- areanum = a + 1;
- freearea(areanum + 1);
- brkset(&bc);
- for (t1 = t->left; i-- && *wp != NULL;) {
- setval(vp, *wp++);
- rv = execute(t1, pin, pout, /* no_fork: */ 0);
- }
- brklist = brklist->nextlev;
- break;
-
- case TWHILE:
- case TUNTIL:
- while (setjmp(bc.brkpt))
- if (isbreak)
- goto broken;
- /* Restore areanum value. It may be incremented by execute()
- * below, and then "continue" may jump back to setjmp above */
- areanum = a + 1;
- freearea(areanum + 1);
- brkset(&bc);
- t1 = t->left;
- while ((execute(t1, pin, pout, /* no_fork: */ 0) == 0) == (t->op_type == TWHILE))
- rv = execute(t->right, pin, pout, /* no_fork: */ 0);
- brklist = brklist->nextlev;
- break;
-
- case TIF:
- case TELIF:
- if (t->right != NULL) {
- rv = !execute(t->left, pin, pout, /* no_fork: */ 0) ?
- execute(t->right->left, pin, pout, /* no_fork: */ 0) :
- execute(t->right->right, pin, pout, /* no_fork: */ 0);
- }
- break;
-
- case TCASE:
- cp = evalstr(t->str, DOSUB | DOTRIM);
- if (cp == NULL)
- cp = "";
-
- DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
- ((t->str == NULL) ? "NULL" : t->str),
- ((cp == NULL) ? "NULL" : cp)));
-
- t1 = findcase(t->left, cp);
- if (t1 != NULL) {
- DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1));
- rv = execute(t1, pin, pout, /* no_fork: */ 0);
- DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1));
- }
- break;
-
- case TBRACE:
-/*
- iopp = t->ioact;
- if (i)
- while (*iopp)
- if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
- rv = -1;
- break;
- }
-*/
- if (rv >= 0) {
- t1 = t->left;
- if (t1) {
- rv = execute(t1, pin, pout, /* no_fork: */ 0);
- }
- }
- break;
-
- };
-
- broken:
-// Restoring op_words is most likely not needed now: see comment in forkexec()
-// (also take a look at exec builtin (doexec) - it touches t->op_words)
- t->op_words = wp2;
- isbreak = 0;
- freehere(areanum);
- freearea(areanum);
- areanum = a;
- if (interactive && intr) {
- closeall();
- fail();
- }
-
- i = trapset;
- if (i != 0) {
- trapset = 0;
- runtrap(i);
- }
-
- DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv));
- return rv;
-}
-
-static builtin_func_ptr inbuilt(const char *s)
-{
- const struct builtincmd *bp;
-
- for (bp = builtincmds; bp->name; bp++)
- if (strcmp(bp->name, s) == 0)
- return bp->builtinfunc;
- return NULL;
-}
-
-static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp)
-{
- pid_t newpid;
- int i;
- builtin_func_ptr bltin = NULL;
- const char *bltin_name = NULL;
- const char *cp;
- struct ioword **iopp;
- int resetsig;
- char **owp;
- int forked;
-
- int *hpin = pin;
- int *hpout = pout;
- char *hwp;
- smallint hinteractive;
- smallint hintr;
- smallint hexecflg;
- struct brkcon *hbrklist;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) &pin;
- (void) &pout;
- (void) ℘
- (void) &bltin;
- (void) &cp;
- (void) &resetsig;
- (void) &owp;
-#endif
-
- DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, no_fork %d\n", t, pin,
- pout, no_fork));
- DBGPRINTF7(("FORKEXEC: t->op_words is %s\n",
- ((t->op_words == NULL) ? "NULL" : t->op_words[0])));
- owp = wp;
- resetsig = 0;
- if (t->op_type == TCOM) {
- while (*wp++ != NULL)
- continue;
- cp = *wp;
-
- /* strip all initial assignments */
- /* FIXME: not correct wrt PATH=yyy command etc */
- if (FLAG['x']) {
- DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n",
- cp, wp, owp));
- echo(cp ? wp : owp);
- }
-
- if (cp == NULL) {
- if (t->ioact == NULL) {
- while ((cp = *owp++) != NULL && assign(cp, COPYV))
- continue;
- DBGPRINTF(("FORKEXEC: returning setstatus(0)\n"));
- return setstatus(0);
- }
- } else { /* cp != NULL */
- bltin_name = cp;
- bltin = inbuilt(cp);
- }
- }
-
- forked = 0;
- // We were pointing t->op_words to temporary (expanded) arg list:
- // t->op_words = wp;
- // and restored it later (in execute()), but "break"
- // longjmps away (at "Run builtin" below), leaving t->op_words clobbered!
- // See http://bugs.busybox.net/view.php?id=846.
- // Now we do not touch t->op_words, but separately pass wp as param list
- // to builtins
- DBGPRINTF(("FORKEXEC: bltin %p, no_fork %d, owp %p\n", bltin,
- no_fork, owp));
- /* Don't fork if it is a lone builtin (not in pipe)
- * OR we are told to _not_ fork */
- if ((!bltin || pin || pout) /* not lone bltin AND */
- && !no_fork /* not told to avoid fork */
- ) {
- /* Save values in case child alters them after vfork */
- hpin = pin;
- hpout = pout;
- hwp = *wp;
- hinteractive = interactive;
- hintr = intr;
- hbrklist = brklist;
- hexecflg = execflg;
-
- DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
- newpid = vfork();
- if (newpid == -1) {
- DBGPRINTF(("FORKEXEC: ERROR, can't vfork()!\n"));
- return -1;
- }
-
- if (newpid > 0) { /* Parent */
- /* Restore values */
- pin = hpin;
- pout = hpout;
- *wp = hwp;
- interactive = hinteractive;
- intr = hintr;
- brklist = hbrklist;
- execflg = hexecflg;
-
- closepipe(pin);
- return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
- }
-
- /* Child */
- DBGPRINTF(("FORKEXEC: child process, bltin=%p (%s)\n", bltin, bltin_name));
- if (interactive) {
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
- resetsig = 1;
- }
- interactive = 0;
- intr = 0;
- forked = 1;
- brklist = 0;
- execflg = 0;
- }
-
- if (owp)
- while ((cp = *owp++) != NULL && assign(cp, COPYV))
- if (!bltin)
- export(lookup(cp));
-
- if (pin) { /* NB: close _first_, then move fds! */
- close(pin[1]);
- xmove_fd(pin[0], 0);
- }
- if (pout) {
- close(pout[0]);
- xmove_fd(pout[1], 1);
- }
-
- iopp = t->ioact;
- if (iopp) {
- if (bltin && bltin != doexec) {
- prs(bltin_name);
- err(": can't redirect shell command");
- if (forked)
- _exit(-1);
- return -1;
- }
- while (*iopp) {
- if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
- /* system-detected error */
- if (forked)
- _exit(-1);
- return -1;
- }
- }
- }
-
- if (bltin) {
- if (forked || pin || pout) {
- /* Builtin in pipe: disallowed */
- /* TODO: allow "exec"? */
- prs(bltin_name);
- err(": can't run builtin as part of pipe");
- if (forked)
- _exit(-1);
- return -1;
- }
- /* Run builtin */
- i = setstatus(bltin(t, wp));
- if (forked)
- _exit(i);
- DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
- return i;
- }
-
- /* should use FIOCEXCL */
- for (i = FDBASE; i < NOFILE; i++)
- close(i);
- if (resetsig) {
- signal(SIGINT, SIG_DFL);
- signal(SIGQUIT, SIG_DFL);
- }
-
- if (t->op_type == TPAREN)
- _exit(execute(t->left, NOPIPE, NOPIPE, /* no_fork: */ 1));
- if (wp[0] == NULL)
- _exit(EXIT_SUCCESS);
-
- cp = rexecve(wp[0], wp, makenv(0, NULL));
- prs(wp[0]);
- prs(": ");
- err(cp);
- if (!execflg)
- trap[0] = NULL;
-
- DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", getpid()));
-
- leave();
- /* NOTREACHED */
- return 0;
-}
-
-/*
- * 0< 1> are ignored as required
- * within pipelines.
- */
-static int iosetup(struct ioword *iop, int pipein, int pipeout)
-{
- int u = -1;
- char *cp = NULL;
- const char *msg;
-
- DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop,
- pipein, pipeout));
-
- if (iop->io_fd == IODEFAULT) /* take default */
- iop->io_fd = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1;
-
- if (pipein && iop->io_fd == 0)
- return 0;
-
- if (pipeout && iop->io_fd == 1)
- return 0;
-
- msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create";
- if ((iop->io_flag & IOHERE) == 0) {
- cp = iop->io_name; /* huh?? */
- cp = evalstr(cp, DOSUB | DOTRIM);
- if (cp == NULL)
- return 1;
- }
-
- if (iop->io_flag & IODUP) {
- if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
- prs(cp);
- err(": illegal >& argument");
- return 1;
- }
- if (*cp == '-')
- iop->io_flag = IOCLOSE;
- iop->io_flag &= ~(IOREAD | IOWRITE);
- }
-
- switch (iop->io_flag) {
- case IOREAD:
- u = open(cp, O_RDONLY);
- break;
-
- case IOHERE:
- case IOHERE | IOXHERE:
- u = herein(iop->io_name, iop->io_flag & IOXHERE);
- cp = (char*)"here file";
- break;
-
- case IOWRITE | IOCAT:
- u = open(cp, O_WRONLY);
- if (u >= 0) {
- lseek(u, (long) 0, SEEK_END);
- break;
- }
- /* fall through to creation if >>file doesn't exist */
-
- case IOWRITE:
- u = creat(cp, 0666);
- break;
-
- case IODUP:
- u = dup2(*cp - '0', iop->io_fd);
- break;
-
- case IOCLOSE:
- close(iop->io_fd);
- return 0;
- }
-
- if (u < 0) {
- prs(cp);
- prs(": can't ");
- warn(msg);
- return 1;
- }
- xmove_fd(u, iop->io_fd);
- return 0;
-}
-
-/*
- * Enter a new loop level (marked for break/continue).
- */
-static void brkset(struct brkcon *bc)
-{
- bc->nextlev = brklist;
- brklist = bc;
-}
-
-/*
- * Wait for the last process created.
- * Print a message for each process found
- * that was killed by a signal.
- * Ignore interrupt signals while waiting
- * unless `canintr' is true.
- */
-static int waitfor(int lastpid, int canintr)
-{
- int pid, rv;
- int s;
- smallint oheedint = heedint;
-
- heedint = 0;
- rv = 0;
- do {
- pid = wait(&s);
- if (pid == -1) {
- if (errno != EINTR || canintr)
- break;
- } else {
- rv = WAITSIG(s);
- if (rv != 0) {
- if (rv < ARRAY_SIZE(signame)) {
- if (signame[rv] != NULL) {
- if (pid != lastpid) {
- prn(pid);
- prs(": ");
- }
- prs(signame[rv]);
- }
- } else {
- if (pid != lastpid) {
- prn(pid);
- prs(": ");
- }
- prs("Signal ");
- prn(rv);
- prs(" ");
- }
- if (WAITCORE(s))
- prs(" - core dumped");
- if (rv >= ARRAY_SIZE(signame) || signame[rv])
- prs("\n");
- rv |= 0x80;
- } else
- rv = WAITVAL(s);
- }
- } while (pid != lastpid);
- heedint = oheedint;
- if (intr) {
- if (interactive) {
- if (canintr)
- intr = 0;
- } else {
- if (exstat == 0)
- exstat = rv;
- onintr(0);
- }
- }
- return rv;
-}
-
-static int setstatus(int s)
-{
- exstat = s;
- setval(lookup("?"), putn(s));
- return s;
-}
-
-/*
- * PATH-searching interface to execve.
- * If getenv("PATH") were kept up-to-date,
- * execvp might be used.
- */
-static const char *rexecve(char *c, char **v, char **envp)
-{
- const char *sp;
- char *tp;
- int asis = 0;
- char *name = c;
-
- if (ENABLE_FEATURE_SH_STANDALONE) {
- if (find_applet_by_name(name) >= 0) {
- /* We have to exec here since we vforked. Running
- * run_applet_and_exit() won't work and bad things
- * will happen. */
- execve(bb_busybox_exec_path, v, envp);
- }
- }
-
- DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp));
-
- sp = any('/', c) ? "" : path->value;
- asis = (*sp == '\0');
- while (asis || *sp != '\0') {
- asis = 0;
- tp = global_env.linep;
- for (; *sp != '\0'; tp++) {
- *tp = *sp++;
- if (*tp == ':') {
- asis = (*sp == '\0');
- break;
- }
- }
- if (tp != global_env.linep)
- *tp++ = '/';
- strcpy(tp, c);
-
- DBGPRINTF3(("REXECVE: global_env.linep is %s\n", global_env.linep));
-
- execve(global_env.linep, v, envp);
-
- switch (errno) {
- case ENOEXEC:
- /* File is executable but file format isnt recognized */
- /* Run it as a shell script */
- /* (execve above didnt do it itself, unlike execvp) */
- *v = global_env.linep;
- v--;
- tp = *v;
- *v = (char*)DEFAULT_SHELL;
- execve(DEFAULT_SHELL, v, envp);
- *v = tp;
- return "no shell";
-
- case ENOMEM:
- return (char *) bb_msg_memory_exhausted;
-
- case E2BIG:
- return "argument list too long";
- }
- }
- if (errno == ENOENT) {
- exstat = 127; /* standards require this */
- return "not found";
- }
- exstat = 126; /* mimic bash */
- return "can't execute";
-}
-
-/*
- * Run the command produced by generator `f'
- * applied to stream `arg'.
- */
-static int run(struct ioarg *argp, int (*f) (struct ioarg *))
-{
- struct op *otree;
- struct wdblock *swdlist;
- struct wdblock *siolist;
- jmp_buf ev, rt;
- xint *ofail;
- int rv;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) &rv;
-#endif
-
- DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n",
- areanum, outtree, failpt));
-
- areanum++;
- swdlist = wdlist;
- siolist = iolist;
- otree = outtree;
- ofail = failpt;
- rv = -1;
-
- errpt = ev;
- if (newenv(setjmp(errpt)) == 0) {
- wdlist = NULL;
- iolist = NULL;
- pushio(argp, f);
- global_env.iobase = global_env.iop;
- yynerrs = 0;
- failpt = rt;
- if (setjmp(failpt) == 0 && yyparse() == 0)
- rv = execute(outtree, NOPIPE, NOPIPE, /* no_fork: */ 0);
- quitenv();
- } else {
- DBGPRINTF(("RUN: error from newenv()!\n"));
- }
-
- wdlist = swdlist;
- iolist = siolist;
- failpt = ofail;
- outtree = otree;
- freearea(areanum--);
-
- return rv;
-}
-
-/* -------- do.c -------- */
-
-/*
- * built-in commands: doX
- */
-
-static int dohelp(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM)
-{
- int col;
- const struct builtincmd *x;
-
- printf(
- "Built-in commands:\n"
- "------------------\n");
-
- col = 0;
- x = builtincmds;
- while (x->name) {
- col += printf("%c%s", ((col == 0) ? '\t' : ' '), x->name);
- if (col > 60) {
- bb_putchar('\n');
- col = 0;
- }
- x++;
- }
-#if ENABLE_FEATURE_SH_STANDALONE
- {
- const char *applet = applet_names;
-
- while (*applet) {
- col += printf("%c%s", ((col == 0) ? '\t' : ' '), applet);
- if (col > 60) {
- bb_putchar('\n');
- col = 0;
- }
- applet += strlen(applet) + 1;
- }
- }
-#endif
- puts("\n");
- return EXIT_SUCCESS;
-}
-
-static int dolabel(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM)
-{
- return 0;
-}
-
-static int dochdir(struct op *t UNUSED_PARAM, char **args)
-{
- const char *cp, *er;
-
- cp = args[1];
- if (cp == NULL) {
- cp = homedir->value;
- if (cp != NULL)
- goto do_cd;
- er = ": no home directory";
- } else {
- do_cd:
- if (chdir(cp) >= 0)
- return 0;
- er = ": bad directory";
- }
- prs(cp != NULL ? cp : "cd");
- err(er);
- return 1;
-}
-
-static int doshift(struct op *t UNUSED_PARAM, char **args)
-{
- int n;
-
- n = args[1] ? getn(args[1]) : 1;
- if (dolc < n) {
- err("nothing to shift");
- return 1;
- }
- dolv[n] = dolv[0];
- dolv += n;
- dolc -= n;
- setval(lookup("#"), putn(dolc));
- return 0;
-}
-
-/*
- * execute login and newgrp directly
- */
-static int dologin(struct op *t UNUSED_PARAM, char **args)
-{
- const char *cp;
-
- if (interactive) {
- signal(SIGINT, SIG_DFL);
- signal(SIGQUIT, SIG_DFL);
- }
- cp = rexecve(args[0], args, makenv(0, NULL));
- prs(args[0]);
- prs(": ");
- err(cp);
- return 1;
-}
-
-static int doumask(struct op *t UNUSED_PARAM, char **args)
-{
- int i;
- char *cp;
-
- cp = args[1];
- if (cp == NULL) {
- i = umask(0);
- umask(i);
- printf("%04o\n", i);
- } else {
- i = bb_strtou(cp, NULL, 8);
- if (errno) {
- err("umask: bad octal number");
- return 1;
- }
- umask(i);
- }
- return 0;
-}
-
-static int doexec(struct op *t, char **args)
-{
- jmp_buf ex;
- xint *ofail;
- char **sv_words;
-
- t->ioact = NULL;
- if (!args[1])
- return 1;
-
- execflg = 1;
- ofail = failpt;
- failpt = ex;
-
- sv_words = t->op_words;
- t->op_words = args + 1;
-// TODO: test what will happen with "exec break" -
-// will it leave t->op_words pointing to garbage?
-// (see http://bugs.busybox.net/view.php?id=846)
- if (setjmp(failpt) == 0)
- execute(t, NOPIPE, NOPIPE, /* no_fork: */ 1);
- t->op_words = sv_words;
-
- failpt = ofail;
- execflg = 0;
-
- return 1;
-}
-
-static int dodot(struct op *t UNUSED_PARAM, char **args)
-{
- int i;
- const char *sp;
- char *tp;
- char *cp;
- int maltmp;
-
- DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, global_env.linep is %s\n",
- t, t->left, t->right, ((global_env.linep == NULL) ? "NULL" : global_env.linep)));
-
- cp = args[1];
- if (cp == NULL) {
- DBGPRINTF(("DODOT: bad args, ret 0\n"));
- return 0;
- }
- DBGPRINTF(("DODOT: cp is %s\n", cp));
-
- sp = any('/', cp) ? ":" : path->value;
-
- DBGPRINTF(("DODOT: sp is %s, global_env.linep is %s\n",
- ((sp == NULL) ? "NULL" : sp),
- ((global_env.linep == NULL) ? "NULL" : global_env.linep)));
-
- while (*sp) {
- tp = global_env.linep;
- while (*sp && (*tp = *sp++) != ':')
- tp++;
- if (tp != global_env.linep)
- *tp++ = '/';
- strcpy(tp, cp);
-
- /* Original code */
- i = open(global_env.linep, O_RDONLY);
- if (i >= 0) {
- exstat = 0;
- maltmp = remap(i);
- DBGPRINTF(("DODOT: remap=%d, exstat=%d, global_env.iofd %d, i %d, global_env.linep is %s\n",
- maltmp, exstat, global_env.iofd, i, global_env.linep));
-
- next(maltmp); /* Basically a PUSHIO */
-
- DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
-
- return exstat;
- }
- } /* while */
-
- prs(cp);
- err(": not found");
-
- return -1;
-}
-
-static int dowait(struct op *t UNUSED_PARAM, char **args)
-{
- int i;
- char *cp;
-
- cp = args[1];
- if (cp != NULL) {
- i = getn(cp);
- if (i == 0)
- return 0;
- } else
- i = -1;
- setstatus(waitfor(i, 1));
- return 0;
-}
-
-static int doread(struct op *t UNUSED_PARAM, char **args)
-{
- char *cp, **wp;
- int nb = 0;
- int nl = 0;
-
- if (args[1] == NULL) {
- err("Usage: read name ...");
- return 1;
- }
- for (wp = args + 1; *wp; wp++) {
- for (cp = global_env.linep; !nl && cp < elinep - 1; cp++) {
- nb = nonblock_safe_read(STDIN_FILENO, cp, sizeof(*cp));
- if (nb != sizeof(*cp))
- break;
- nl = (*cp == '\n');
- if (nl || (wp[1] && any(*cp, ifs->value)))
- break;
- }
- *cp = '\0';
- if (nb <= 0)
- break;
- setval(lookup(*wp), global_env.linep);
- }
- return nb <= 0;
-}
-
-static int doeval(struct op *t UNUSED_PARAM, char **args)
-{
- return RUN(awordlist, args + 1, wdchar);
-}
-
-static int dotrap(struct op *t UNUSED_PARAM, char **args)
-{
- int n, i;
- int resetsig;
-
- if (args[1] == NULL) {
- for (i = 0; i <= _NSIG; i++)
- if (trap[i]) {
- prn(i);
- prs(": ");
- prs(trap[i]);
- prs("\n");
- }
- return 0;
- }
- resetsig = isdigit(args[1][0]);
- for (i = resetsig ? 1 : 2; args[i] != NULL; ++i) {
- n = getsig(args[i]);
- freecell(trap[n]);
- trap[n] = 0;
- if (!resetsig) {
- if (args[1][0] != '\0') {
- trap[n] = strsave(args[1], 0);
- setsig(n, sig);
- } else
- setsig(n, SIG_IGN);
- } else {
- if (interactive) {
- if (n == SIGINT)
- setsig(n, onintr);
- else
- setsig(n, n == SIGQUIT ? SIG_IGN : SIG_DFL);
- } else
- setsig(n, SIG_DFL);
- }
- }
- return 0;
-}
-
-static int getsig(char *s)
-{
- int n;
-
- n = getn(s);
- if (n < 0 || n > _NSIG) {
- err("trap: bad signal number");
- n = 0;
- }
- return n;
-}
-
-static void setsig(int n, sighandler_t f)
-{
- if (n == 0)
- return;
- if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) {
- ourtrap[n] = 1;
- signal(n, f);
- }
-}
-
-static int getn(char *as)
-{
- char *s;
- int n, m;
-
- s = as;
- m = 1;
- if (*s == '-') {
- m = -1;
- s++;
- }
- for (n = 0; isdigit(*s); s++)
- n = (n * 10) + (*s - '0');
- if (*s) {
- prs(as);
- err(": bad number");
- }
- return n * m;
-}
-
-static int dobreak(struct op *t UNUSED_PARAM, char **args)
-{
- return brkcontin(args[1], 1);
-}
-
-static int docontinue(struct op *t UNUSED_PARAM, char **args)
-{
- return brkcontin(args[1], 0);
-}
-
-static int brkcontin(char *cp, int val)
-{
- struct brkcon *bc;
- int nl;
-
- nl = cp == NULL ? 1 : getn(cp);
- if (nl <= 0)
- nl = 999;
- do {
- bc = brklist;
- if (bc == NULL)
- break;
- brklist = bc->nextlev;
- } while (--nl);
- if (nl) {
- err("bad break/continue level");
- return 1;
- }
- isbreak = (val != 0);
- longjmp(bc->brkpt, 1);
- /* NOTREACHED */
-}
-
-static int doexit(struct op *t UNUSED_PARAM, char **args)
-{
- char *cp;
-
- execflg = 0;
- cp = args[1];
- if (cp != NULL)
- setstatus(getn(cp));
-
- DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t));
-
- leave();
- /* NOTREACHED */
- return 0;
-}
-
-static int doexport(struct op *t UNUSED_PARAM, char **args)
-{
- rdexp(args + 1, export, EXPORT);
- return 0;
-}
-
-static int doreadonly(struct op *t UNUSED_PARAM, char **args)
-{
- rdexp(args + 1, ronly, RONLY);
- return 0;
-}
-
-static void rdexp(char **wp, void (*f) (struct var *), int key)
-{
- DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key));
- DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
-
- if (*wp != NULL) {
- for (; *wp != NULL; wp++) {
- if (isassign(*wp)) {
- char *cp;
-
- assign(*wp, COPYV);
- for (cp = *wp; *cp != '='; cp++)
- continue;
- *cp = '\0';
- }
- if (checkname(*wp))
- (*f) (lookup(*wp));
- else
- badid(*wp);
- }
- } else
- putvlist(key, 1);
-}
-
-static void badid(char *s)
-{
- prs(s);
- err(": bad identifier");
-}
-
-static int doset(struct op *t UNUSED_PARAM, char **args)
-{
- struct var *vp;
- char *cp;
- int n;
-
- cp = args[1];
- if (cp == NULL) {
- for (vp = vlist; vp; vp = vp->next)
- varput(vp->name, STDOUT_FILENO);
- return 0;
- }
- if (*cp == '-') {
- args++;
- if (*++cp == 0)
- FLAG['x'] = FLAG['v'] = 0;
- else {
- for (; *cp; cp++) {
- switch (*cp) {
- case 'e':
- if (!interactive)
- FLAG['e']++;
- break;
-
- default:
- if (*cp >= 'a' && *cp <= 'z')
- FLAG[(int) *cp]++;
- break;
- }
- }
- }
- setdash();
- }
- if (args[1]) {
- args[0] = dolv[0];
- for (n = 1; args[n]; n++)
- setarea((char *) args[n], 0);
- dolc = n - 1;
- dolv = args;
- setval(lookup("#"), putn(dolc));
- setarea((char *) (dolv - 1), 0);
- }
- return 0;
-}
-
-static void varput(char *s, int out)
-{
- if (isalnum(*s) || *s == '_') {
- xwrite_str(out, s);
- xwrite(out, "\n", 1);
- }
-}
-
-
-/*
- * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
- * This file contains code for the times builtin.
- */
-static void times_fmt(char *buf, clock_t val, unsigned clk_tck)
-{
- unsigned min, sec;
- if (sizeof(val) > sizeof(int))
- sec = ((unsigned long)val) / clk_tck;
- else
- sec = ((unsigned)val) / clk_tck;
- min = sec / 60;
-#if ENABLE_DESKTOP
- sprintf(buf, "%um%u.%03us", min, (sec - min * 60),
- /* msec: */ ((unsigned)(val - (clock_t)sec * clk_tck)) * 1000 / clk_tck
- );
-#else
- sprintf(buf, "%um%us", min, (sec - min * 60));
-#endif
-}
-
-static int dotimes(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM)
-{
- struct tms buf;
- unsigned clk_tck = sysconf(_SC_CLK_TCK);
- /* How much do we need for "NmN.NNNs" ? */
- enum { TIMEBUF_SIZE = sizeof(int)*3 + sizeof(int)*3 + 6 };
- char u[TIMEBUF_SIZE], s[TIMEBUF_SIZE];
- char cu[TIMEBUF_SIZE], cs[TIMEBUF_SIZE];
-
- times(&buf);
-
- times_fmt(u, buf.tms_utime, clk_tck);
- times_fmt(s, buf.tms_stime, clk_tck);
- times_fmt(cu, buf.tms_cutime, clk_tck);
- times_fmt(cs, buf.tms_cstime, clk_tck);
-
- printf("%s %s\n%s %s\n", u, s, cu, cs);
- return 0;
-}
-
-
-/* -------- eval.c -------- */
-
-/*
- * ${}
- * `command`
- * blank interpretation
- * quoting
- * glob
- */
-
-static char **eval(char **ap, int f)
-{
- struct wdblock *wb;
- char **wp;
- char **wf;
- jmp_buf ev;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) ℘
- (void) ≈
-#endif
-
- DBGPRINTF4(("EVAL: enter, f=%d\n", f));
-
- wp = NULL;
- wb = NULL;
- wf = NULL;
- errpt = ev;
- if (newenv(setjmp(errpt)) == 0) {
- while (*ap && isassign(*ap))
- expand(*ap++, &wb, f & ~DOGLOB);
- if (FLAG['k']) {
- for (wf = ap; *wf; wf++) {
- if (isassign(*wf))
- expand(*wf, &wb, f & ~DOGLOB);
- }
- }
- for (wb = addword((char *) NULL, wb); *ap; ap++) {
- if (!FLAG['k'] || !isassign(*ap))
- expand(*ap, &wb, f & ~DOKEY);
- }
- wb = addword((char *) 0, wb);
- wp = getwords(wb);
- quitenv();
- } else
- gflg = 1;
-
- return gflg ? (char **) NULL : wp;
-}
-
-
-/*
- * Make the exported environment from the exported
- * names in the dictionary. Keyword assignments
- * will already have been done.
- */
-static char **makenv(int all, struct wdblock *wb)
-{
- struct var *vp;
-
- DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
-
- for (vp = vlist; vp; vp = vp->next)
- if (all || vp->status & EXPORT)
- wb = addword(vp->name, wb);
- wb = addword((char *) 0, wb);
- return getwords(wb);
-}
-
-static int expand(const char *cp, struct wdblock **wbp, int f)
-{
- jmp_buf ev;
- char *xp;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) &cp;
-#endif
-
- DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
-
- gflg = 0;
-
- if (cp == NULL)
- return 0;
-
- if (!anys("$`'\"", cp) && !anys(ifs->value, cp)
- && ((f & DOGLOB) == 0 || !anys("[*?", cp))
- ) {
- xp = strsave(cp, areanum);
- if (f & DOTRIM)
- unquote(xp);
- *wbp = addword(xp, *wbp);
- return 1;
- }
- errpt = ev;
- if (newenv(setjmp(errpt)) == 0) {
- PUSHIO(aword, cp, strchar);
- global_env.iobase = global_env.iop;
- while ((xp = blank(f)) && gflg == 0) {
- global_env.linep = xp;
- xp = strsave(xp, areanum);
- if ((f & DOGLOB) == 0) {
- if (f & DOTRIM)
- unquote(xp);
- *wbp = addword(xp, *wbp);
- } else
- *wbp = glob(xp, *wbp);
- }
- quitenv();
- } else
- gflg = 1;
- return gflg == 0;
-}
-
-static char *evalstr(char *cp, int f)
-{
- struct wdblock *wb;
-
- DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f));
-
- wb = NULL;
- if (expand(cp, &wb, f)) {
- if (wb == NULL || wb->w_nword == 0
- || (cp = wb->w_words[0]) == NULL
- ) {
-// TODO: I suspect that
-// char *evalstr(char *cp, int f) is actually
-// const char *evalstr(const char *cp, int f)!
- cp = (char*)"";
- }
- DELETE(wb);
- } else
- cp = NULL;
- return cp;
-}
-
-
-/*
- * Blank interpretation and quoting
- */
-static char *blank(int f)
-{
- int c, c1;
- char *sp;
- int scanequals, foundequals;
-
- DBGPRINTF3(("BLANK: enter, f=%d\n", f));
-
- sp = global_env.linep;
- scanequals = f & DOKEY;
- foundequals = 0;
-
- loop:
- c = subgetc('"', foundequals);
- switch (c) {
- case 0:
- if (sp == global_env.linep)
- return 0;
- *global_env.linep++ = 0;
- return sp;
-
- default:
- if (f & DOBLANK && any(c, ifs->value))
- goto loop;
- break;
-
- case '"':
- case '\'':
- scanequals = 0;
- if (INSUB())
- break;
- for (c1 = c; (c = subgetc(c1, 1)) != c1;) {
- if (c == 0)
- break;
- if (c == '\'' || !any(c, "$`\""))
- c |= QUOTE;
- *global_env.linep++ = c;
- }
- c = 0;
- }
- unget(c);
- if (!isalpha(c) && c != '_')
- scanequals = 0;
- for (;;) {
- c = subgetc('"', foundequals);
- if (c == 0
- || f & (DOBLANK && any(c, ifs->value))
- || (!INSUB() && any(c, "\"'"))
- ) {
- scanequals = 0;
- unget(c);
- if (any(c, "\"'"))
- goto loop;
- break;
- }
- if (scanequals) {
- if (c == '=') {
- foundequals = 1;
- scanequals = 0;
- } else if (!isalnum(c) && c != '_')
- scanequals = 0;
- }
- *global_env.linep++ = c;
- }
- *global_env.linep++ = 0;
- return sp;
-}
-
-/*
- * Get characters, substituting for ` and $
- */
-static int subgetc(char ec, int quoted)
-{
- char c;
-
- DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
-
- again:
- c = my_getc(ec);
- if (!INSUB() && ec != '\'') {
- if (c == '`') {
- if (grave(quoted) == 0)
- return 0;
- global_env.iop->task = XGRAVE;
- goto again;
- }
- if (c == '$') {
- c = dollar(quoted);
- if (c == 0) {
- global_env.iop->task = XDOLL;
- goto again;
- }
- }
- }
- return c;
-}
-
-/*
- * Prepare to generate the string returned by ${} substitution.
- */
-static int dollar(int quoted)
-{
- int otask;
- struct io *oiop;
- char *dolp;
- char *s, c, *cp = NULL;
- struct var *vp;
-
- DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
-
- c = readc();
- s = global_env.linep;
- if (c != '{') {
- *global_env.linep++ = c;
- if (isalpha(c) || c == '_') {
- while ((c = readc()) != 0 && (isalnum(c) || c == '_'))
- if (global_env.linep < elinep)
- *global_env.linep++ = c;
- unget(c);
- }
- c = 0;
- } else {
- oiop = global_env.iop;
- otask = global_env.iop->task;
-
- global_env.iop->task = XOTHER;
- while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n')
- if (global_env.linep < elinep)
- *global_env.linep++ = c;
- if (oiop == global_env.iop)
- global_env.iop->task = otask;
- if (c != '}') {
- err("unclosed ${");
- gflg = 1;
- return c;
- }
- }
- if (global_env.linep >= elinep) {
- err("string in ${} too long");
- gflg = 1;
- global_env.linep -= 10;
- }
- *global_env.linep = 0;
- if (*s)
- for (cp = s + 1; *cp; cp++)
- if (any(*cp, "=-+?")) {
- c = *cp;
- *cp++ = 0;
- break;
- }
- if (s[1] == 0 && (*s == '*' || *s == '@')) {
- if (dolc > 1) {
- /* currently this does not distinguish $* and $@ */
- /* should check dollar */
- global_env.linep = s;
- PUSHIO(awordlist, dolv + 1, dolchar);
- return 0;
- } else { /* trap the nasty ${=} */
- s[0] = '1';
- s[1] = '\0';
- }
- }
- vp = lookup(s);
- dolp = vp->value;
- if (dolp == null) {
- switch (c) {
- case '=':
- if (isdigit(*s)) {
- err("can't use ${...=...} with $n");
- gflg = 1;
- break;
- }
- setval(vp, cp);
- dolp = vp->value;
- break;
-
- case '-':
- dolp = strsave(cp, areanum);
- break;
-
- case '?':
- if (*cp == 0) {
- prs("missing value for ");
- err(s);
- } else
- err(cp);
- gflg = 1;
- break;
- }
- } else if (c == '+')
- dolp = strsave(cp, areanum);
- if (FLAG['u'] && dolp == null) {
- prs("unset variable: ");
- err(s);
- gflg = 1;
- }
- global_env.linep = s;
- PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
- return 0;
-}
-
-/*
- * Run the command in `...` and read its output.
- */
-
-static int grave(int quoted)
-{
- /* moved to G: static char child_cmd[LINELIM]; */
-
- const char *cp;
- int i;
- int j;
- int pf[2];
- const char *src;
- char *dest;
- int count;
- int ignore;
- int ignore_once;
- char *argument_list[4];
- struct wdblock *wb = NULL;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) &cp;
-#endif
-
- for (cp = global_env.iop->argp->aword; *cp != '`'; cp++) {
- if (*cp == 0) {
- err("no closing `");
- return 0;
- }
- }
-
- /* string copy with dollar expansion */
- src = global_env.iop->argp->aword;
- dest = child_cmd;
- count = 0;
- ignore = 0;
- ignore_once = 0;
- while ((*src != '`') && (count < LINELIM)) {
- if (*src == '\'')
- ignore = !ignore;
- if (*src == '\\')
- ignore_once = 1;
- if (*src == '$' && !ignore && !ignore_once) {
- struct var *vp;
- /* moved to G to reduce stack usage
- char var_name[LINELIM];
- char alt_value[LINELIM];
- */
-#define var_name (G.grave__var_name)
-#define alt_value (G.grave__alt_value)
- int var_index = 0;
- int alt_index = 0;
- char operator = 0;
- int braces = 0;
- char *value;
-
- src++;
- if (*src == '{') {
- braces = 1;
- src++;
- }
-
- var_name[var_index++] = *src++;
- while (isalnum(*src) || *src=='_')
- var_name[var_index++] = *src++;
- var_name[var_index] = 0;
-
- if (braces) {
- switch (*src) {
- case '}':
- break;
- case '-':
- case '=':
- case '+':
- case '?':
- operator = * src;
- break;
- default:
- err("unclosed ${\n");
- return 0;
- }
- if (operator) {
- src++;
- while (*src && (*src != '}')) {
- alt_value[alt_index++] = *src++;
- }
- alt_value[alt_index] = 0;
- if (*src != '}') {
- err("unclosed ${\n");
- return 0;
- }
- }
- src++;
- }
-
- if (isalpha(*var_name)) {
- /* let subshell handle it instead */
-
- char *namep = var_name;
-
- *dest++ = '$';
- if (braces)
- *dest++ = '{';
- while (*namep)
- *dest++ = *namep++;
- if (operator) {
- char *altp = alt_value;
- *dest++ = operator;
- while (*altp)
- *dest++ = *altp++;
- }
- if (braces)
- *dest++ = '}';
-
- wb = addword(lookup(var_name)->name, wb);
- } else {
- /* expand */
-
- vp = lookup(var_name);
- if (vp->value != null)
- value = (operator == '+') ?
- alt_value : vp->value;
- else if (operator == '?') {
- err(alt_value);
- return 0;
- } else if (alt_index && (operator != '+')) {
- value = alt_value;
- if (operator == '=')
- setval(vp, value);
- } else
- continue;
-
- while (*value && (count < LINELIM)) {
- *dest++ = *value++;
- count++;
- }
- }
-#undef var_name
-#undef alt_value
- } else {
- *dest++ = *src++;
- count++;
- ignore_once = 0;
- }
- }
- *dest = '\0';
-
- if (openpipe(pf) < 0)
- return 0;
-
- while ((i = vfork()) == -1 && errno == EAGAIN)
- continue;
-
- DBGPRINTF3(("GRAVE: i is %p\n", io));
-
- if (i < 0) {
- closepipe(pf);
- err((char *) bb_msg_memory_exhausted);
- return 0;
- }
- if (i != 0) {
- waitpid(i, NULL, 0); // safe_waitpid?
- global_env.iop->argp->aword = ++cp;
- close(pf[1]);
- PUSHIO(afile, remap(pf[0]),
- (int (*)(struct ioarg *)) ((quoted) ? qgravechar : gravechar));
- return 1;
- }
- /* allow trapped signals */
- /* XXX - Maybe this signal stuff should go as well? */
- for (j = 0; j <= _NSIG; j++)
- if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
- signal(j, SIG_DFL);
-
- /* Testcase where below checks are needed:
- * close stdout & run this script:
- * files=`ls`
- * echo "$files" >zz
- */
- xmove_fd(pf[1], 1);
- if (pf[0] != 1)
- close(pf[0]);
-
- argument_list[0] = (char *) DEFAULT_SHELL;
- argument_list[1] = (char *) "-c";
- argument_list[2] = child_cmd;
- argument_list[3] = NULL;
-
- cp = rexecve(argument_list[0], argument_list, makenv(1, wb));
- prs(argument_list[0]);
- prs(": ");
- err(cp);
- _exit(EXIT_FAILURE);
-}
-
-
-static char *unquote(char *as)
-{
- char *s;
-
- s = as;
- if (s != NULL)
- while (*s)
- *s++ &= ~QUOTE;
- return as;
-}
-
-/* -------- glob.c -------- */
-
-/*
- * glob
- */
-
-#define scopy(x) strsave((x), areanum)
-#define BLKSIZ 512
-#define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent))
-
-static struct wdblock *cl, *nl;
-static const char spcl[] ALIGN1= "[?*";
-
-static struct wdblock *glob(char *cp, struct wdblock *wb)
-{
- int i;
- char *pp;
-
- if (cp == 0)
- return wb;
- i = 0;
- for (pp = cp; *pp; pp++)
- if (any(*pp, spcl))
- i++;
- else if (!any(*pp & ~QUOTE, spcl))
- *pp &= ~QUOTE;
- if (i != 0) {
- for (cl = addword(scopy(cp), NULL); anyspcl(cl); cl = nl) {
- nl = newword(cl->w_nword * 2);
- for (i = 0; i < cl->w_nword; i++) { /* for each argument */
- for (pp = cl->w_words[i]; *pp; pp++)
- if (any(*pp, spcl)) {
- globname(cl->w_words[i], pp);
- break;
- }
- if (*pp == '\0')
- nl = addword(scopy(cl->w_words[i]), nl);
- }
- for (i = 0; i < cl->w_nword; i++)
- DELETE(cl->w_words[i]);
- DELETE(cl);
- }
- if (cl->w_nword) {
- for (i = 0; i < cl->w_nword; i++)
- unquote(cl->w_words[i]);
- qsort_string_vector(cl->w_words, cl->w_nword);
- for (i = 0; i < cl->w_nword; i++)
- wb = addword(cl->w_words[i], wb);
- DELETE(cl);
- return wb;
- }
- }
- wb = addword(unquote(cp), wb);
- return wb;
-}
-
-static void globname(char *we, char *pp)
-{
- char *np, *cp;
- char *name, *gp, *dp;
- int k;
- DIR *dirp;
- struct dirent *de;
- char dname[NAME_MAX + 1];
- struct stat dbuf;
-
- for (np = we; np != pp; pp--)
- if (pp[-1] == '/')
- break;
- dp = cp = get_space((int) (pp - np) + 3);
- while (np < pp)
- *cp++ = *np++;
- *cp++ = '.';
- *cp = '\0';
- gp = cp = get_space(strlen(pp) + 1);
- while (*np && *np != '/')
- *cp++ = *np++;
- *cp = '\0';
- dirp = opendir(dp);
- if (dirp == 0) {
- DELETE(dp);
- DELETE(gp);
- return;
- }
- dname[NAME_MAX] = '\0';
- while ((de = readdir(dirp)) != NULL) {
- /* XXX Hmmm... What this could be? (abial) */
- /* if (ent[j].d_ino == 0) continue;
- */
- strncpy(dname, de->d_name, NAME_MAX);
- if (dname[0] == '.')
- if (*gp != '.')
- continue;
- for (k = 0; k < NAME_MAX; k++)
- if (any(dname[k], spcl))
- dname[k] |= QUOTE;
- if (gmatch(dname, gp)) {
- name = generate(we, pp, dname, np);
- if (*np && !anys(np, spcl)) {
- if (stat(name, &dbuf)) {
- DELETE(name);
- continue;
- }
- }
- nl = addword(name, nl);
- }
- }
- closedir(dirp);
- DELETE(dp);
- DELETE(gp);
-}
-
-/*
- * generate a pathname as below.
- * start..end1 / middle end
- * the slashes come for free
- */
-static char *generate(char *start1, char *end1, char *middle, char *end)
-{
- char *p;
- char *op, *xp;
-
- p = op = get_space((int)(end1 - start1) + strlen(middle) + strlen(end) + 2);
- xp = start1;
- while (xp != end1)
- *op++ = *xp++;
- xp = middle;
- while (*xp != '\0')
- *op++ = *xp++;
- strcpy(op, end);
- return p;
-}
-
-static int anyspcl(struct wdblock *wb)
-{
- int i;
- char **wd;
-
- wd = wb->w_words;
- for (i = 0; i < wb->w_nword; i++)
- if (anys(spcl, *wd++))
- return 1;
- return 0;
-}
-
-
-/* -------- word.c -------- */
-
-static struct wdblock *newword(int nw)
-{
- struct wdblock *wb;
-
- wb = get_space(sizeof(*wb) + nw * sizeof(char *));
- wb->w_bsize = nw;
- wb->w_nword = 0;
- return wb;
-}
-
-static struct wdblock *addword(char *wd, struct wdblock *wb)
-{
- struct wdblock *wb2;
- int nw;
-
- if (wb == NULL)
- wb = newword(NSTART);
- nw = wb->w_nword;
- if (nw >= wb->w_bsize) {
- wb2 = newword(nw * 2);
- memcpy((char *) wb2->w_words, (char *) wb->w_words,
- nw * sizeof(char *));
- wb2->w_nword = nw;
- DELETE(wb);
- wb = wb2;
- }
- wb->w_words[wb->w_nword++] = wd;
- return wb;
-}
-
-static char **getwords(struct wdblock *wb)
-{
- char **wd;
- int nb;
-
- if (wb == NULL)
- return NULL;
- if (wb->w_nword == 0) {
- DELETE(wb);
- return NULL;
- }
- nb = sizeof(*wd) * wb->w_nword;
- wd = get_space(nb);
- memcpy(wd, wb->w_words, nb);
- DELETE(wb); /* perhaps should done by caller */
- return wd;
-}
-
-
-/* -------- io.c -------- */
-
-/*
- * shell IO
- */
-
-static int my_getc(int ec)
-{
- int c;
-
- if (global_env.linep > elinep) {
- while ((c = readc()) != '\n' && c)
- continue;
- err("input line too long");
- gflg = 1;
- return c;
- }
- c = readc();
- if ((ec != '\'') && (ec != '`') && (global_env.iop->task != XGRAVE)) {
- if (c == '\\') {
- c = readc();
- if (c == '\n' && ec != '\"')
- return my_getc(ec);
- c |= QUOTE;
- }
- }
- return c;
-}
-
-static void unget(int c)
-{
- if (global_env.iop >= global_env.iobase)
- global_env.iop->peekc = c;
-}
-
-static int eofc(void)
-{
- return global_env.iop < global_env.iobase || (global_env.iop->peekc == 0 && global_env.iop->prev == 0);
-}
-
-static int readc(void)
-{
- int c;
-
- RCPRINTF(("READC: global_env.iop %p, global_env.iobase %p\n", global_env.iop, global_env.iobase));
-
- for (; global_env.iop >= global_env.iobase; global_env.iop--) {
- RCPRINTF(("READC: global_env.iop %p, peekc 0x%x\n", global_env.iop, global_env.iop->peekc));
- c = global_env.iop->peekc;
- if (c != '\0') {
- global_env.iop->peekc = 0;
- return c;
- }
- if (global_env.iop->prev != 0) {
- c = (*global_env.iop->iofn)(global_env.iop->argp, global_env.iop);
- if (c != '\0') {
- if (c == -1) {
- global_env.iop++;
- continue;
- }
- if (global_env.iop == iostack)
- ioecho(c);
- global_env.iop->prev = c;
- return c;
- }
- if (global_env.iop->task == XIO && global_env.iop->prev != '\n') {
- global_env.iop->prev = 0;
- if (global_env.iop == iostack)
- ioecho('\n');
- return '\n';
- }
- }
- if (global_env.iop->task == XIO) {
- if (multiline) {
- global_env.iop->prev = 0;
- return 0;
- }
- if (interactive && global_env.iop == iostack + 1) {
-#if ENABLE_FEATURE_EDITING
- current_prompt = prompt->value;
-#else
- prs(prompt->value);
-#endif
- }
- }
- } /* FOR */
-
- if (global_env.iop >= iostack) {
- RCPRINTF(("READC: return 0, global_env.iop %p\n", global_env.iop));
- return 0;
- }
-
- DBGPRINTF(("READC: leave()...\n"));
- leave();
- /* NOTREACHED */
- return 0;
-}
-
-static void ioecho(char c)
-{
- if (FLAG['v'])
- write(STDERR_FILENO, &c, sizeof c);
-}
-
-static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
-{
- DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, global_env.iop %p\n", argp,
- argp->afid, global_env.iop));
-
- /* Set env ptr for io source to next array spot and check for array overflow */
- if (++global_env.iop >= &iostack[NPUSH]) {
- global_env.iop--;
- err("Shell input nested too deeply");
- gflg = 1;
- return;
- }
-
- /* We did not overflow the NPUSH array spots so setup data structs */
-
- global_env.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */
-
- if (argp->afid != AFID_NOBUF)
- global_env.iop->argp = argp;
- else {
-
- global_env.iop->argp = ioargstack + (global_env.iop - iostack); /* MAL - index into stack */
- *global_env.iop->argp = *argp; /* copy data from temp area into stack spot */
-
- /* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
-
- if (global_env.iop == &iostack[0])
- global_env.iop->argp->afbuf = &mainbuf;
- else
- global_env.iop->argp->afbuf = &sharedbuf;
-
- /* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
- /* This line appears to be active when running scripts from command line */
- if ((isatty(global_env.iop->argp->afile) == 0)
- && (global_env.iop == &iostack[0]
- || lseek(global_env.iop->argp->afile, 0L, SEEK_CUR) != -1)) {
- if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */
- bufid = AFID_ID; /* AFID_ID = 0 */
-
- global_env.iop->argp->afid = bufid; /* assign buffer id */
- }
-
- DBGPRINTF(("PUSHIO: iostack %p, global_env.iop %p, afbuf %p\n",
- iostack, global_env.iop, global_env.iop->argp->afbuf));
- DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, global_env.iop %p\n",
- &mainbuf, &sharedbuf, bufid, global_env.iop));
-
- }
-
- global_env.iop->prev = ~'\n';
- global_env.iop->peekc = 0;
- global_env.iop->xchar = 0;
- global_env.iop->nlcount = 0;
-
- if (fn == filechar || fn == linechar)
- global_env.iop->task = XIO;
- else if (fn == (int (*)(struct ioarg *)) gravechar
- || fn == (int (*)(struct ioarg *)) qgravechar)
- global_env.iop->task = XGRAVE;
- else
- global_env.iop->task = XOTHER;
-}
-
-static struct io *setbase(struct io *ip)
-{
- struct io *xp;
-
- xp = global_env.iobase;
- global_env.iobase = ip;
- return xp;
-}
-
-/*
- * Input generating functions
- */
-
-/*
- * Produce the characters of a string, then a newline, then NUL.
- */
-static int nlchar(struct ioarg *ap)
-{
- char c;
-
- if (ap->aword == NULL)
- return '\0';
- c = *ap->aword++;
- if (c == '\0') {
- ap->aword = NULL;
- return '\n';
- }
- return c;
-}
-
-/*
- * Given a list of words, produce the characters
- * in them, with a space after each word.
- */
-static int wdchar(struct ioarg *ap)
-{
- char c;
- char **wl;
-
- wl = ap->awordlist;
- if (wl == NULL)
- return 0;
- if (*wl != NULL) {
- c = *(*wl)++;
- if (c != 0)
- return c & 0177;
- ap->awordlist++;
- return ' ';
- }
- ap->awordlist = NULL;
- return '\n';
-}
-
-/*
- * Return the characters of a list of words,
- * producing a space between them.
- */
-static int dolchar(struct ioarg *ap)
-{
- char *wp;
-
- wp = *ap->awordlist++;
- if (wp != NULL) {
- PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
- return -1;
- }
- return 0;
-}
-
-static int xxchar(struct ioarg *ap)
-{
- int c;
-
- if (ap->aword == NULL)
- return 0;
- c = *ap->aword++;
- if (c == '\0') {
- ap->aword = NULL;
- return ' ';
- }
- return c;
-}
-
-/*
- * Produce the characters from a single word (string).
- */
-static int strchar(struct ioarg *ap)
-{
- if (ap->aword == NULL)
- return 0;
- return *ap->aword++;
-}
-
-/*
- * Produce quoted characters from a single word (string).
- */
-static int qstrchar(struct ioarg *ap)
-{
- int c;
-
- if (ap->aword == NULL)
- return 0;
- c = *ap->aword++;
- if (c)
- c |= QUOTE;
- return c;
-}
-
-/*
- * Return the characters from a file.
- */
-static int filechar(struct ioarg *ap)
-{
- int i;
- char c;
- struct iobuf *bp = ap->afbuf;
-
- if (ap->afid != AFID_NOBUF) {
- i = (ap->afid != bp->id);
- if (i || bp->bufp == bp->ebufp) {
- if (i)
- lseek(ap->afile, ap->afpos, SEEK_SET);
-
- i = nonblock_safe_read(ap->afile, bp->buf, sizeof(bp->buf));
- if (i <= 0) {
- closef(ap->afile);
- return 0;
- }
-
- bp->id = ap->afid;
- bp->bufp = bp->buf;
- bp->ebufp = bp->bufp + i;
- }
-
- ap->afpos++;
- return *bp->bufp++ & 0177;
- }
-#if ENABLE_FEATURE_EDITING
- if (interactive && isatty(ap->afile)) {
- /* moved to G: static char filechar_cmdbuf[BUFSIZ]; */
- static int position = 0, size = 0;
-
- while (size == 0 || position >= size) {
- size = read_line_input(current_prompt, filechar_cmdbuf, BUFSIZ, line_input_state);
- if (size < 0) /* Error/EOF */
- exit(EXIT_SUCCESS);
- position = 0;
- /* if Ctrl-C, size == 0 and loop will repeat */
- }
- c = filechar_cmdbuf[position];
- position++;
- return c;
- }
-#endif
- i = nonblock_safe_read(ap->afile, &c, sizeof(c));
- return i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0);
-}
-
-/*
- * Return the characters from a here temp file.
- */
-static int herechar(struct ioarg *ap)
-{
- char c;
-
- if (nonblock_safe_read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
- close(ap->afile);
- c = '\0';
- }
- return c;
-}
-
-/*
- * Return the characters produced by a process (`...`).
- * Quote them if required, and remove any trailing newline characters.
- */
-static int gravechar(struct ioarg *ap, struct io *iop)
-{
- int c;
-
- c = qgravechar(ap, iop) & ~QUOTE;
- if (c == '\n')
- c = ' ';
- return c;
-}
-
-static int qgravechar(struct ioarg *ap, struct io *iop)
-{
- int c;
-
- DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop));
-
- if (iop->xchar) {
- if (iop->nlcount) {
- iop->nlcount--;
- return '\n' | QUOTE;
- }
- c = iop->xchar;
- iop->xchar = 0;
- } else if ((c = filechar(ap)) == '\n') {
- iop->nlcount = 1;
- while ((c = filechar(ap)) == '\n')
- iop->nlcount++;
- iop->xchar = c;
- if (c == 0)
- return c;
- iop->nlcount--;
- c = '\n';
- }
- return c != 0 ? c | QUOTE : 0;
-}
-
-/*
- * Return a single command (usually the first line) from a file.
- */
-static int linechar(struct ioarg *ap)
-{
- int c;
-
- c = filechar(ap);
- if (c == '\n') {
- if (!multiline) {
- closef(ap->afile);
- ap->afile = -1; /* illegal value */
- }
- }
- return c;
-}
-
-/*
- * Remap fd into shell's fd space
- */
-static int remap(int fd)
-{
- int i;
- int map[NOFILE];
- int newfd;
-
- DBGPRINTF(("REMAP: fd=%d, global_env.iofd=%d\n", fd, global_env.iofd));
-
- if (fd < global_env.iofd) {
- for (i = 0; i < NOFILE; i++)
- map[i] = 0;
-
- do {
- map[fd] = 1;
- newfd = dup(fd);
- fd = newfd;
- } while (fd >= 0 && fd < global_env.iofd);
-
- for (i = 0; i < NOFILE; i++)
- if (map[i])
- close(i);
-
- if (fd < 0)
- err("too many files open in shell");
- }
-
- return fd;
-}
-
-static int openpipe(int *pv)
-{
- int i;
-
- i = pipe(pv);
- if (i < 0)
- err("can't create pipe - try again");
- return i;
-}
-
-static void closepipe(int *pv)
-{
- if (pv != NULL) {
- close(pv[0]);
- close(pv[1]);
- }
-}
-
-
-/* -------- here.c -------- */
-
-/*
- * here documents
- */
-
-static void markhere(char *s, struct ioword *iop)
-{
- struct here *h, *lh;
-
- DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
-
- h = get_space(sizeof(struct here));
- if (h == NULL)
- return;
-
- h->h_tag = evalstr(s, DOSUB);
- if (h->h_tag == 0)
- return;
-
- h->h_iop = iop;
- iop->io_name = 0;
- h->h_next = NULL;
- if (inhere == 0)
- inhere = h;
- else {
- for (lh = inhere; lh != NULL; lh = lh->h_next) {
- if (lh->h_next == 0) {
- lh->h_next = h;
- break;
- }
- }
- }
- iop->io_flag |= IOHERE | IOXHERE;
- for (s = h->h_tag; *s; s++) {
- if (*s & QUOTE) {
- iop->io_flag &= ~IOXHERE;
- *s &= ~QUOTE;
- }
- }
- h->h_dosub = ((iop->io_flag & IOXHERE) ? '\0' : '\'');
-}
-
-static void gethere(void)
-{
- struct here *h, *hp;
-
- DBGPRINTF7(("GETHERE: enter...\n"));
-
- /* Scan here files first leaving inhere list in place */
- for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
- readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub /* NUL or ' */);
-
- /* Make inhere list active - keep list intact for scraphere */
- if (hp != NULL) {
- hp->h_next = acthere;
- acthere = inhere;
- inhere = NULL;
- }
-}
-
-static void readhere(char **name, char *s, int ec)
-{
- int tf;
- char tname[30] = ".msh_XXXXXX";
- int c;
- jmp_buf ev;
- char myline[LINELIM + 1];
- char *thenext;
-
- DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s));
-
- tf = mkstemp(tname);
- if (tf < 0)
- return;
-
- *name = strsave(tname, areanum);
- errpt = ev;
- if (newenv(setjmp(errpt)) != 0)
- unlink(tname);
- else {
- pushio(global_env.iop->argp, (int (*)(struct ioarg *)) global_env.iop->iofn);
- global_env.iobase = global_env.iop;
- for (;;) {
- if (interactive && global_env.iop <= iostack) {
-#if ENABLE_FEATURE_EDITING
- current_prompt = cprompt->value;
-#else
- prs(cprompt->value);
-#endif
- }
- thenext = myline;
- while ((c = my_getc(ec)) != '\n' && c) {
- if (ec == '\'')
- c &= ~QUOTE;
- if (thenext >= &myline[LINELIM]) {
- c = 0;
- break;
- }
- *thenext++ = c;
- }
- *thenext = 0;
- if (strcmp(s, myline) == 0 || c == 0)
- break;
- *thenext++ = '\n';
- write(tf, myline, (int) (thenext - myline));
- }
- if (c == 0) {
- prs("here document `");
- prs(s);
- err("' unclosed");
- }
- quitenv();
- }
- close(tf);
-}
-
-/*
- * open here temp file.
- * if unquoted here, expand here temp file into second temp file.
- */
-static int herein(char *hname, int xdoll)
-{
- int hf;
- int tf;
-
-#if __GNUC__
- /* Avoid longjmp clobbering */
- (void) &tf;
-#endif
- if (hname == NULL)
- return -1;
-
- DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
-
- hf = open(hname, O_RDONLY);
- if (hf < 0)
- return -1;
-
- if (xdoll) {
- char c;
- char tname[30] = ".msh_XXXXXX";
- jmp_buf ev;
-
- tf = mkstemp(tname);
- if (tf < 0)
- return -1;
- errpt = ev;
- if (newenv(setjmp(errpt)) == 0) {
- PUSHIO(afile, hf, herechar);
- setbase(global_env.iop);
- while ((c = subgetc(0, 0)) != 0) {
- c &= ~QUOTE;
- write(tf, &c, sizeof c);
- }
- quitenv();
- } else
- unlink(tname);
- close(tf);
- tf = open(tname, O_RDONLY);
- unlink(tname);
- return tf;
- }
- return hf;
-}
-
-static void scraphere(void)
-{
- struct here *h;
-
- DBGPRINTF7(("SCRAPHERE: enter...\n"));
-
- for (h = inhere; h != NULL; h = h->h_next) {
- if (h->h_iop && h->h_iop->io_name)
- unlink(h->h_iop->io_name);
- }
- inhere = NULL;
-}
-
-/* unlink here temp files before a freearea(area) */
-static void freehere(int area)
-{
- struct here *h, *hl;
-
- DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
-
- hl = NULL;
- for (h = acthere; h != NULL; h = h->h_next) {
- if (getarea((char *) h) >= area) {
- if (h->h_iop->io_name != NULL)
- unlink(h->h_iop->io_name);
- if (hl == NULL)
- acthere = h->h_next;
- else
- hl->h_next = h->h_next;
- } else {
- hl = h;
- }
- }
-}
-
-
-/* -------- sh.c -------- */
-/*
- * shell
- */
-
-int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int msh_main(int argc, char **argv)
-{
- int f;
- char *s;
- int cflag;
- char *name, **ap;
- int (*iof) (struct ioarg *);
-
- INIT_G();
-
- sharedbuf.id = AFID_NOBUF;
- mainbuf.id = AFID_NOBUF;
- elinep = line + sizeof(line) - 5;
-
-#if ENABLE_FEATURE_EDITING
- line_input_state = new_line_input_t(FOR_SHELL);
-#endif
-
- DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ));
-
- initarea();
- ap = environ;
- if (ap != NULL) {
- while (*ap)
- assign(*ap++, !COPYV);
- for (ap = environ; *ap;)
- export(lookup(*ap++));
- }
- closeall();
- areanum = 1;
-
- shell = lookup("SHELL");
- if (shell->value == null)
- setval(shell, (char *)DEFAULT_SHELL);
- export(shell);
-
- homedir = lookup("HOME");
- if (homedir->value == null)
- setval(homedir, "/");
- export(homedir);
-
- setval(lookup("$"), putn(getpid()));
-
- path = lookup("PATH");
- if (path->value == null) {
- /* Can be merged with same string elsewhere in bbox */
- if (geteuid() == 0)
- setval(path, bb_default_root_path);
- else
- setval(path, bb_default_path);
- }
- export(path);
-
- ifs = lookup("IFS");
- if (ifs->value == null)
- setval(ifs, " \t\n");
-
-#ifdef MSHDEBUG
- mshdbg_var = lookup("MSHDEBUG");
- if (mshdbg_var->value == null)
- setval(mshdbg_var, "0");
-#endif
-
- prompt = lookup("PS1");
-#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
- if (prompt->value == null)
-#endif
- setval(prompt, DEFAULT_USER_PROMPT);
- if (geteuid() == 0) {
- setval(prompt, DEFAULT_ROOT_PROMPT);
- prompt->status &= ~EXPORT;
- }
- cprompt = lookup("PS2");
-#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
- if (cprompt->value == null)
-#endif
- setval(cprompt, "> ");
-
- iof = filechar;
- cflag = 0;
- name = *argv++;
- if (--argc >= 1) {
- if (argv[0][0] == '-' && argv[0][1] != '\0') {
- for (s = argv[0] + 1; *s; s++)
- switch (*s) {
- case 'c':
- prompt->status &= ~EXPORT;
- cprompt->status &= ~EXPORT;
- setval(prompt, "");
- setval(cprompt, "");
- cflag = 1;
- if (--argc > 0)
- PUSHIO(aword, *++argv, iof = nlchar);
- break;
-
- case 'q':
- qflag = SIG_DFL;
- break;
-
- case 's':
- /* standard input */
- break;
-
- case 't':
- prompt->status &= ~EXPORT;
- setval(prompt, "");
- iof = linechar;
- break;
-
- case 'i':
- interactive = 1;
- default:
- if (*s >= 'a' && *s <= 'z')
- FLAG[(int) *s]++;
- }
- } else {
- argv--;
- argc++;
- }
-
- if (iof == filechar && --argc > 0) {
- setval(prompt, "");
- setval(cprompt, "");
- prompt->status &= ~EXPORT;
- cprompt->status &= ~EXPORT;
-
-/* Shell is non-interactive, activate printf-based debug */
-#ifdef MSHDEBUG
- mshdbg = mshdbg_var->value[0] - '0';
- if (mshdbg < 0)
- mshdbg = 0;
-#endif
- DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
-
- name = *++argv;
- if (newfile(name))
- exit(EXIT_FAILURE); /* Exit on error */
- }
- }
-
- setdash();
-
- /* This won't be true if PUSHIO has been called, say from newfile() above */
- if (global_env.iop < iostack) {
- PUSHIO(afile, 0, iof);
- if (isatty(0) && isatty(1) && !cflag) {
- interactive = 1;
-#if !ENABLE_FEATURE_SH_EXTRA_QUIET
-#ifdef MSHDEBUG
- printf("\n\n%s built-in shell (msh with debug)\n", bb_banner);
-#else
- printf("\n\n%s built-in shell (msh)\n", bb_banner);
-#endif
- printf("Enter 'help' for a list of built-in commands.\n\n");
-#endif
- }
- }
-
- signal(SIGQUIT, qflag);
- if (name && name[0] == '-') {
- interactive = 1;
- f = open(".profile", O_RDONLY);
- if (f >= 0)
- next(remap(f));
- f = open("/etc/profile", O_RDONLY);
- if (f >= 0)
- next(remap(f));
- }
- if (interactive)
- signal(SIGTERM, sig);
-
- if (signal(SIGINT, SIG_IGN) != SIG_IGN)
- signal(SIGINT, onintr);
-
-/* Handle "msh SCRIPT VAR=val params..." */
-/* Disabled: bash does not do it! */
-#if 0
- argv++;
- /* skip leading args of the form VAR=val */
- while (*argv && assign(*argv, !COPYV)) {
- argc--;
- argv++;
- }
- argv--;
-#endif
- dolv = argv;
- dolc = argc;
- dolv[0] = name;
-
- setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
-
- DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, global_env.iop %p, iostack %p\n", interactive, global_env.iop, iostack));
-
- for (;;) {
- if (interactive && global_env.iop <= iostack) {
-#if ENABLE_FEATURE_EDITING
- current_prompt = prompt->value;
-#else
- prs(prompt->value);
-#endif
- }
- onecommand();
- /* Ensure that getenv("PATH") stays current */
- setenv("PATH", path->value, 1);
- }
-
- DBGPRINTF(("MSH_MAIN: returning.\n"));
-}
-
-
-/*
- * Copyright (c) 1987,1997, Prentice Hall
- * All rights reserved.
- *
- * Redistribution and use of the MINIX operating system in source and
- * binary forms, with or without modification, are permitted provided
- * that the following conditions are met:
- *
- * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * Neither the name of Prentice Hall nor the names of the software
- * authors or contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
- * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
projects / oweals / busybox.git / commitdiff