*
*/
-#include "internal.h"
+
+//#define BB_FEATURE_SH_BACKTICKS
+//#define BB_FEATURE_SH_IF_EXPRESSIONS
+#define BB_FEATURE_SH_ENVIRONMENT
+//#define DEBUG_SHELL
+
+
+#include "busybox.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <unistd.h>
+#include <getopt.h>
#ifdef BB_FEATURE_SH_COMMAND_EDITING
#include "cmdedit.h"
#endif
+#define MAX_LINE 256 /* size of input buffer for `read' builtin */
#define MAX_READ 128 /* size of input buffer for `read' builtin */
#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
REDIRECT_APPEND
};
+static const unsigned int REGULAR_JOB_CONTEXT=0x1;
+static const unsigned int IF_TRUE_CONTEXT=0x2;
+static const unsigned int IF_FALSE_CONTEXT=0x4;
+static const unsigned int THEN_EXP_CONTEXT=0x8;
+static const unsigned int ELSE_EXP_CONTEXT=0x10;
+
+
struct jobSet {
struct job *head; /* head of list of running jobs */
struct job *fg; /* current foreground job */
struct childProgram *progs; /* array of programs in job */
struct job *next; /* to track background commands */
int stoppedProgs; /* number of programs alive, but stopped */
+ int jobContext; /* bitmask defining current context */
};
struct builtInCommand {
char *cmd; /* name */
char *descr; /* description */
- char *usage; /* usage */
int (*function) (struct job *, struct jobSet * jobList); /* function ptr */
};
/* function prototypes for builtins */
static int builtin_cd(struct job *cmd, struct jobSet *junk);
static int builtin_env(struct job *dummy, struct jobSet *junk);
+static int builtin_exec(struct job *cmd, struct jobSet *junk);
static int builtin_exit(struct job *cmd, struct jobSet *junk);
static int builtin_fg_bg(struct job *cmd, struct jobSet *jobList);
static int builtin_help(struct job *cmd, struct jobSet *junk);
static int builtin_source(struct job *cmd, struct jobSet *jobList);
static int builtin_unset(struct job *cmd, struct jobSet *junk);
static int builtin_read(struct job *cmd, struct jobSet *junk);
+#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
+static int builtin_if(struct job *cmd, struct jobSet *junk);
+static int builtin_then(struct job *cmd, struct jobSet *junk);
+static int builtin_else(struct job *cmd, struct jobSet *junk);
+static int builtin_fi(struct job *cmd, struct jobSet *junk);
+#endif
/* function prototypes for shell stuff */
static void checkJobs(struct jobSet *jobList);
static int getCommand(FILE * source, char *command);
-static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg);
-static int setupRedirections(struct childProgram *prog);
-static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg);
+static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *inBg);
+static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2]);
static int busy_loop(FILE * input);
* 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 struct builtInCommand bltins[] = {
- {"bg", "Resume a job in the background", "bg [%%job]", builtin_fg_bg},
- {"cd", "Change working directory", "cd [dir]", builtin_cd},
- {"exit", "Exit from shell()", "exit", builtin_exit},
- {"fg", "Bring job into the foreground", "fg [%%job]", builtin_fg_bg},
- {"jobs", "Lists the active jobs", "jobs", builtin_jobs},
- {"export", "Set environment variable", "export [VAR=value]", builtin_export},
- {"unset", "Unset environment variable", "unset VAR", builtin_unset},
- {"read", "Input environment variable", "read [VAR]", builtin_read},
- {NULL, NULL, NULL, NULL}
+ {"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},
+#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
+ {"if", NULL, builtin_if},
+ {"then", NULL, builtin_then},
+ {"else", NULL, builtin_else},
+ {"fi", NULL, builtin_fi},
+#endif
+ {NULL, NULL, NULL}
};
/* Table of forking built-in functions (things that fork cannot change global
* variables in the parent process, such as the current working directory) */
static struct builtInCommand bltins_forking[] = {
- {"env", "Print all environment variables", "env", builtin_env},
- {"pwd", "Print current directory", "pwd", builtin_pwd},
- {".", "Source-in and run commands in a file", ". filename", builtin_source},
- {"help", "List shell built-in commands", "help", builtin_help},
- {NULL, NULL, NULL, NULL}
+ {"env", "Print all environment variables", builtin_env},
+ {"pwd", "Print current directory", builtin_pwd},
+ {"help", "List shell built-in commands", builtin_help},
+ {NULL, NULL, NULL}
};
-static const char shell_usage[] =
- "sh [FILE]...\n"
- " or: sh -c command [args]...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nlash: The BusyBox command interpreter (shell).\n\n"
-#endif
- ;
-
static char *prompt = "# ";
-static char *cwd = NULL;
+static char *cwd;
static char *local_pending_command = NULL;
+static char *promptStr = NULL;
+static struct jobSet jobList = { NULL, NULL };
+static int argc;
+static char **argv;
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+static int lastBgPid=-1;
+static int lastReturnCode=-1;
+static int showXtrace=FALSE;
+#endif
+
#ifdef BB_FEATURE_SH_COMMAND_EDITING
-void win_changed(int sig)
+void win_changed(int junk)
{
- struct winsize win = { 0, 0 };
+ struct winsize win = { 0, 0, 0, 0 };
ioctl(0, TIOCGWINSZ, &win);
if (win.ws_col > 0) {
cmdedit_setwidth( win.ws_col - 1);
printf("cd: %s: %s\n", newdir, strerror(errno));
return FALSE;
}
- getcwd(cwd, sizeof(cwd));
+ getcwd(cwd, sizeof(char)*MAX_LINE);
return TRUE;
}
return (0);
}
+/* built-in 'exec' handler */
+static int builtin_exec(struct job *cmd, struct jobSet *junk)
+{
+ if (cmd->progs[0].argv[1])
+ {
+ cmd->progs[0].argv++;
+ execvp(cmd->progs[0].argv[0], cmd->progs[0].argv);
+ fatalError("Exec to %s failed: %s\n", cmd->progs[0].argv[0],
+ strerror(errno));
+ }
+ return TRUE;
+}
+
/* built-in 'exit' handler */
static int builtin_exit(struct job *cmd, struct jobSet *junk)
{
if (!cmd->progs[0].argv[1] == 1)
exit TRUE;
- return(atoi(cmd->progs[0].argv[1]));
+ exit (atoi(cmd->progs[0].argv[1]));
}
/* built-in 'fg' and 'bg' handler */
if (!jobList->head) {
if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
- fprintf(stderr, "%s: exactly one argument is expected\n",
+ errorMsg("%s: exactly one argument is expected\n",
cmd->progs[0].argv[0]);
return FALSE;
}
if (sscanf(cmd->progs[0].argv[1], "%%%d", &jobNum) != 1) {
- fprintf(stderr, "%s: bad argument '%s'\n",
+ errorMsg("%s: bad argument '%s'\n",
cmd->progs[0].argv[0], cmd->progs[0].argv[1]);
return FALSE;
for (job = jobList->head; job; job = job->next) {
}
if (!job) {
- fprintf(stderr, "%s: unknown job %d\n",
+ errorMsg("%s: unknown job %d\n",
cmd->progs[0].argv[0], jobNum);
return FALSE;
}
}
/* built-in 'help' handler */
-static int builtin_help(struct job *cmd, struct jobSet *junk)
+static int builtin_help(struct job *dummy, struct jobSet *junk)
{
struct builtInCommand *x;
fprintf(stdout, "\nBuilt-in commands:\n");
fprintf(stdout, "-------------------\n");
for (x = bltins; x->cmd; x++) {
+ if (x->descr==NULL)
+ continue;
fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
}
for (x = bltins_forking; x->cmd; x++) {
+ if (x->descr==NULL)
+ continue;
fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
}
fprintf(stdout, "\n\n");
/* built-in 'pwd' handler */
static int builtin_pwd(struct job *dummy, struct jobSet *junk)
{
- getcwd(cwd, sizeof(cwd));
+ getcwd(cwd, sizeof(char)*MAX_LINE);
fprintf(stdout, "%s\n", cwd);
return TRUE;
}
return (res);
}
+#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
+/* Built-in handler for 'if' commands */
+static int builtin_if(struct job *cmd, struct jobSet *jobList)
+{
+ int status;
+ char* charptr1=cmd->text+3; /* skip over the leading 'if ' */
+
+ /* Now run the 'if' command */
+ status=strlen(charptr1);
+ local_pending_command = xmalloc(status+1);
+ strncpy(local_pending_command, charptr1, status);
+ local_pending_command[status]='\0';
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "'if' now testing '%s'\n", local_pending_command);
+#endif
+ status = busy_loop(NULL); /* Frees local_pending_command */
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "if test returned ");
+#endif
+ if (status == 0) {
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "TRUE\n");
+#endif
+ cmd->jobContext |= IF_TRUE_CONTEXT;
+ } else {
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "FALSE\n");
+#endif
+ cmd->jobContext |= IF_FALSE_CONTEXT;
+ }
+
+ return status;
+}
+
+/* Built-in handler for 'then' (part of the 'if' command) */
+static int builtin_then(struct job *cmd, struct jobSet *junk)
+{
+ int status;
+ char* charptr1=cmd->text+5; /* skip over the leading 'then ' */
+
+ if (! (cmd->jobContext & (IF_TRUE_CONTEXT|IF_FALSE_CONTEXT))) {
+ errorMsg("unexpected token `then'\n");
+ return FALSE;
+ }
+ /* If the if result was FALSE, skip the 'then' stuff */
+ if (cmd->jobContext & IF_FALSE_CONTEXT) {
+ return TRUE;
+ }
+
+ cmd->jobContext |= THEN_EXP_CONTEXT;
+ //printf("Hit an then -- jobContext=%d\n", cmd->jobContext);
+
+ /* Now run the 'then' command */
+ status=strlen(charptr1);
+ local_pending_command = xmalloc(status+1);
+ strncpy(local_pending_command, charptr1, status);
+ local_pending_command[status]='\0';
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "'then' now running '%s'\n", charptr1);
+#endif
+ return( busy_loop(NULL));
+}
+
+/* Built-in handler for 'else' (part of the 'if' command) */
+static int builtin_else(struct job *cmd, struct jobSet *junk)
+{
+ int status;
+ char* charptr1=cmd->text+5; /* skip over the leading 'else ' */
+
+ if (! (cmd->jobContext & (IF_TRUE_CONTEXT|IF_FALSE_CONTEXT))) {
+ errorMsg("unexpected token `else'\n");
+ return FALSE;
+ }
+ /* If the if result was TRUE, skip the 'else' stuff */
+ if (cmd->jobContext & IF_TRUE_CONTEXT) {
+ return TRUE;
+ }
+
+ cmd->jobContext |= ELSE_EXP_CONTEXT;
+ //printf("Hit an else -- jobContext=%d\n", cmd->jobContext);
+
+ /* Now run the 'else' command */
+ status=strlen(charptr1);
+ local_pending_command = xmalloc(status+1);
+ strncpy(local_pending_command, charptr1, status);
+ local_pending_command[status]='\0';
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "'else' now running '%s'\n", charptr1);
+#endif
+ return( busy_loop(NULL));
+}
+
+/* Built-in handler for 'fi' (part of the 'if' command) */
+static int builtin_fi(struct job *cmd, struct jobSet *junk)
+{
+ if (! (cmd->jobContext & (IF_TRUE_CONTEXT|IF_FALSE_CONTEXT))) {
+ errorMsg("unexpected token `fi'\n");
+ return FALSE;
+ }
+ /* Clear out the if and then context bits */
+ cmd->jobContext &= ~(IF_TRUE_CONTEXT|IF_FALSE_CONTEXT|THEN_EXP_CONTEXT|ELSE_EXP_CONTEXT);
+#ifdef DEBUG_SHELL
+ fprintf(stderr, "Hit an fi -- jobContext=%d\n", cmd->jobContext);
+#endif
+ return TRUE;
+}
+#endif
+
/* Built-in '.' handler (read-in and execute commands from file) */
static int builtin_source(struct job *cmd, struct jobSet *junk)
{
/* Now run the file */
status = busy_loop(input);
+ fclose(input);
return (status);
}
break;
}
+ /* This happens on backticked commands */
+ if(job==NULL)
+ return;
+
if (WIFEXITED(status) || WIFSIGNALED(status)) {
/* child exited */
job->runningProgs--;
perror("waitpid");
}
+static int setupRedirections(struct childProgram *prog)
+{
+ int i;
+ int openfd;
+ int mode = O_RDONLY;
+ struct redirectionSpecifier *redir = prog->redirections;
+
+ for (i = 0; i < prog->numRedirections; 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(redir->filename, mode, 0666);
+ 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!) */
+ errorMsg("error opening %s: %s\n", redir->filename,
+ strerror(errno));
+ return 1;
+ }
+
+ if (openfd != redir->fd) {
+ dup2(openfd, redir->fd);
+ close(openfd);
+ }
+ }
+
+ return 0;
+}
+
+
static int getCommand(FILE * source, char *command)
{
if (source == NULL) {
if (source == stdin) {
#ifdef BB_FEATURE_SH_COMMAND_EDITING
int len;
- char *promptStr;
+
+ /*
+ ** 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)
+ */
+ cmdedit_init();
+ signal(SIGWINCH, win_changed);
len=fprintf(stdout, "%s %s", cwd, prompt);
fflush(stdout);
promptStr=(char*)xmalloc(sizeof(char)*(len+1));
sprintf(promptStr, "%s %s", cwd, prompt);
cmdedit_read_input(promptStr, command);
free( promptStr);
+ cmdedit_terminate();
+ signal(SIGWINCH, SIG_DFL);
return 0;
#else
fprintf(stdout, "%s %s", cwd, prompt);
return 0;
}
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+#define __MAX_INT_CHARS 7
+static char* itoa(register int i)
+{
+ static char a[__MAX_INT_CHARS];
+ register char *b = a + sizeof(a) - 1;
+ int sign = (i < 0);
+
+ if (sign)
+ i = -i;
+ *b = 0;
+ do
+ {
+ *--b = '0' + (i % 10);
+ i /= 10;
+ }
+ while (i);
+ if (sign)
+ *--b = '-';
+ return b;
+}
+#endif
+
static void globLastArgument(struct childProgram *prog, int *argcPtr,
int *argcAllocedPtr)
{
- int argc = *argcPtr;
+ int argc_l = *argcPtr;
int argcAlloced = *argcAllocedPtr;
int rc;
int flags;
int i;
char *src, *dst, *var;
- if (argc > 1) { /* cmd->globResult is already initialized */
+ if (argc_l > 1) { /* cmd->globResult is already initialized */
flags = GLOB_APPEND;
i = prog->globResult.gl_pathc;
} else {
i = 0;
}
/* do shell variable substitution */
- if(*prog->argv[argc - 1] == '$' && (var = getenv(prog->argv[argc - 1] + 1)))
- prog->argv[argc - 1] = var;
-
- rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
- if (rc == GLOB_NOSPACE) {
- fprintf(stderr, "out of space during glob operation\n");
- return;
- } else if (rc == GLOB_NOMATCH ||
- (!rc && (prog->globResult.gl_pathc - i) == 1 &&
- !strcmp(prog->argv[argc - 1],
- prog->globResult.gl_pathv[i]))) {
- /* we need to remove whatever \ quoting is still present */
- src = dst = prog->argv[argc - 1];
- while (*src) {
- if (*src != '\\')
- *dst++ = *src;
- src++;
+ if(*prog->argv[argc_l - 1] == '$') {
+ if ((var = getenv(prog->argv[argc_l - 1] + 1))) {
+ prog->argv[argc_l - 1] = var;
+ }
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ else {
+ switch(*(prog->argv[argc_l - 1] + 1)) {
+ case '?':
+ prog->argv[argc_l - 1] = itoa(lastReturnCode);
+ break;
+ case '$':
+ prog->argv[argc_l - 1] = itoa(getpid());
+ break;
+ case '#':
+ prog->argv[argc_l - 1] = itoa(argc-1);
+ break;
+ case '!':
+ if (lastBgPid==-1)
+ *(prog->argv[argc_l - 1])='\0';
+ else
+ prog->argv[argc_l - 1] = itoa(lastBgPid);
+ break;
+ case '0':case '1':case '2':case '3':case '4':
+ case '5':case '6':case '7':case '8':case '9':
+ {
+ int index=*(prog->argv[argc_l - 1] + 1)-48;
+ if (index >= argc) {
+ *(prog->argv[argc_l - 1])='\0';
+ } else {
+ prog->argv[argc_l - 1] = argv[index];
+ }
+ }
+ break;
+ }
}
- *dst = '\0';
- } else if (!rc) {
- argcAlloced += (prog->globResult.gl_pathc - i);
- prog->argv =
- realloc(prog->argv, argcAlloced * sizeof(*prog->argv));
- memcpy(prog->argv + (argc - 1), prog->globResult.gl_pathv + i,
- sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
- argc += (prog->globResult.gl_pathc - i - 1);
+#endif
}
+ if (strpbrk(prog->argv[argc_l - 1],"*[]?")!= NULL){
+ rc = glob(prog->argv[argc_l - 1], flags, NULL, &prog->globResult);
+ if (rc == GLOB_NOSPACE) {
+ errorMsg("out of space during glob operation\n");
+ return;
+ } else if (rc == GLOB_NOMATCH ||
+ (!rc && (prog->globResult.gl_pathc - i) == 1 &&
+ strcmp(prog->argv[argc_l - 1],
+ prog->globResult.gl_pathv[i]) == 0)) {
+ /* we need to remove whatever \ quoting is still present */
+ src = dst = prog->argv[argc_l - 1];
+ while (*src) {
+ if (*src != '\\')
+ *dst++ = *src;
+ src++;
+ }
+ *dst = '\0';
+ } else if (!rc) {
+ argcAlloced += (prog->globResult.gl_pathc - i);
+ prog->argv = xrealloc(prog->argv, argcAlloced * sizeof(*prog->argv));
+ memcpy(prog->argv + (argc_l - 1), prog->globResult.gl_pathv + i,
+ sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
+ argc_l += (prog->globResult.gl_pathc - i - 1);
+ }
+ }else{
+ src = dst = prog->argv[argc_l - 1];
+ while (*src) {
+ if (*src != '\\')
+ *dst++ = *src;
+ src++;
+ }
+ *dst = '\0';
+ prog->globResult.gl_pathc=0;
+ if (flags==0)
+ prog->globResult.gl_pathv=NULL;
+ }
*argcAllocedPtr = argcAlloced;
- *argcPtr = argc;
+ *argcPtr = argc_l;
}
/* Return cmd->numProgs as 0 if no command is present (e.g. an empty
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 parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg)
+static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *inBg)
{
char *command;
char *returnCommand = NULL;
char *src, *buf, *chptr;
- int argc = 0;
+ int argc_l = 0;
int done = 0;
int argvAlloced;
int i;
return 0;
}
- *isBg = 0;
+ *inBg = 0;
job->numProgs = 1;
job->progs = xmalloc(sizeof(*job->progs));
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 = calloc(1, 2*strlen(*commandPtr) + 1);
+ job->cmdBuf = command = xcalloc(2*strlen(*commandPtr) + 1, sizeof(char));
job->text = NULL;
prog = job->progs;
if (*src == '\\') {
src++;
if (!*src) {
- fprintf(stderr, "character expected after \\\n");
+ errorMsg("character expected after \\\n");
freeJob(job);
return 1;
}
*src == ']') *buf++ = '\\';
*buf++ = *src;
} else if (isspace(*src)) {
- if (*prog->argv[argc]) {
- buf++, argc++;
+ if (*prog->argv[argc_l]) {
+ buf++, argc_l++;
/* +1 here leaves room for the NULL which ends argv */
- if ((argc + 1) == argvAlloced) {
+ if ((argc_l + 1) == argvAlloced) {
argvAlloced += 5;
- prog->argv = realloc(prog->argv,
- sizeof(*prog->argv) *
- argvAlloced);
+ prog->argv = xrealloc(prog->argv,
+ sizeof(*prog->argv) *
+ argvAlloced);
}
- globLastArgument(prog, &argc, &argvAlloced);
- prog->argv[argc] = buf;
+ globLastArgument(prog, &argc_l, &argvAlloced);
+ prog->argv[argc_l] = buf;
}
} else
switch (*src) {
break;
case '#': /* comment */
- done = 1;
+ if (*(src-1)== '$')
+ *buf++ = *src;
+ else
+ done = 1;
break;
case '>': /* redirections */
case '<':
i = prog->numRedirections++;
- prog->redirections = realloc(prog->redirections,
- sizeof(*prog->redirections) *
- (i + 1));
+ prog->redirections = xrealloc(prog->redirections,
+ sizeof(*prog->redirections) *
+ (i + 1));
prog->redirections[i].fd = -1;
- if (buf != prog->argv[argc]) {
+ if (buf != prog->argv[argc_l]) {
/* the stuff before this character may be the file number
being redirected */
prog->redirections[i].fd =
- strtol(prog->argv[argc], &chptr, 10);
+ strtol(prog->argv[argc_l], &chptr, 10);
- if (*chptr && *prog->argv[argc]) {
- buf++, argc++;
- globLastArgument(prog, &argc, &argvAlloced);
- prog->argv[argc] = buf;
+ if (*chptr && *prog->argv[argc_l]) {
+ buf++, argc_l++;
+ globLastArgument(prog, &argc_l, &argvAlloced);
+ prog->argv[argc_l] = buf;
}
}
chptr++;
if (!*chptr) {
- fprintf(stderr, "file name expected after %c\n", *src);
+ errorMsg("file name expected after %c\n", *src);
freeJob(job);
job->numProgs=0;
return 1;
*buf++ = *chptr++;
src = chptr - 1; /* we src++ later */
- prog->argv[argc] = ++buf;
+ prog->argv[argc_l] = ++buf;
break;
case '|': /* pipe */
/* finish this command */
- if (*prog->argv[argc])
- argc++;
- if (!argc) {
- fprintf(stderr, "empty command in pipe1.\n");
+ if (*prog->argv[argc_l])
+ argc_l++;
+ if (!argc_l) {
+ errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
}
- prog->argv[argc] = NULL;
+ prog->argv[argc_l] = NULL;
/* and start the next */
job->numProgs++;
- job->progs = realloc(job->progs,
- sizeof(*job->progs) * job->numProgs);
+ job->progs = xrealloc(job->progs,
+ sizeof(*job->progs) * job->numProgs);
prog = job->progs + (job->numProgs - 1);
prog->numRedirections = 0;
prog->redirections = NULL;
prog->freeGlob = 0;
- argc = 0;
+ prog->isStopped = 0;
+ argc_l = 0;
argvAlloced = 5;
prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced);
src++;
if (!*src) {
- fprintf(stderr, "empty command in pipe2\n");
+ errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
break;
case '&': /* background */
- *isBg = 1;
+ *inBg = 1;
case ';': /* multiple commands */
done = 1;
returnCommand = *commandPtr + (src - *commandPtr) + 1;
break;
- case '\\':
- src++;
- if (!*src) {
- fprintf(stderr, "character expected after \\\n");
- freeJob(job);
- return 1;
- }
- if (*src == '*' || *src == '[' || *src == ']'
- || *src == '?') *buf++ = '\\';
- /* fallthrough */
+#ifdef BB_FEATURE_SH_BACKTICKS
case '`':
/* Exec a backtick-ed command */
{
- char* newcmd=NULL;
+ char* charptr1=NULL, *charptr2;
char* ptr=NULL;
- struct job newJob;
+ struct job *newJob;
+ struct jobSet njobList = { NULL, NULL };
+ int pipefd[2];
+ int size;
ptr=strchr(++src, '`');
if (ptr==NULL) {
return 1;
}
- newcmd = xmalloc(1+ptr-src);
- snprintf(newcmd, 1+ptr-src, src);
-
- if (!parseCommand(&newcmd, &newJob, jobList, isBg) &&
- newJob.numProgs) {
- runCommand(&newJob, jobList, *isBg);
+ /* Make some space to hold just the backticked command */
+ charptr1 = charptr2 = xmalloc(1+ptr-src);
+ memcpy(charptr1, src, ptr-src);
+ charptr1[ptr-src] = '\0';
+ newJob = xmalloc(sizeof(struct job));
+ /* Now parse and run the backticked command */
+ if (!parseCommand(&charptr1, newJob, &njobList, inBg)
+ && newJob->numProgs) {
+ pipe(pipefd);
+ runCommand(newJob, &njobList, 0, pipefd);
}
-
- /* Clip out the the backticked command from the string */
- memmove(--src, ptr, strlen(ptr)+1);
- free(newcmd);
+ checkJobs(jobList);
+ freeJob(newJob);
+ free(charptr2);
+
+ /* Make a copy of any stuff left over in the command
+ * line after the second backtick */
+ charptr2 = xmalloc(strlen(ptr)+1);
+ memcpy(charptr2, ptr+1, strlen(ptr));
+
+
+ /* Copy the output from the backtick-ed command into the
+ * command line, making extra room as needed */
+ --src;
+ charptr1 = xmalloc(BUFSIZ);
+ while ( (size=fullRead(pipefd[0], charptr1, BUFSIZ-1)) >0) {
+ int newSize=src - *commandPtr + size + 1 + strlen(charptr2);
+ if (newSize > BUFSIZ) {
+ *commandPtr=xrealloc(*commandPtr, src - *commandPtr +
+ size + 1 + strlen(charptr2));
+ }
+ memcpy(src, charptr1, size);
+ src+=size;
+ }
+ free(charptr1);
+ close(pipefd[0]);
+ if (*(src-1)=='\n')
+ --src;
+
+ /* Now paste into the *commandPtr all the stuff
+ * leftover after the second backtick */
+ memcpy(src, charptr2, strlen(charptr2)+1);
+ free(charptr2);
+
+ /* Now recursively call parseCommand to deal with the new
+ * and improved version of the command line with the backtick
+ * results expanded in place... */
+ freeJob(job);
+ return(parseCommand(commandPtr, job, jobList, inBg));
}
break;
+#endif // BB_FEATURE_SH_BACKTICKS
+
+ case '\\':
+ src++;
+ if (!*src) {
+ errorMsg("character expected after \\\n");
+ freeJob(job);
+ return 1;
+ }
+ if (*src == '*' || *src == '[' || *src == ']'
+ || *src == '?') *buf++ = '\\';
+ /* fallthrough */
default:
*buf++ = *src;
}
src++;
}
- if (*prog->argv[argc]) {
- argc++;
- globLastArgument(prog, &argc, &argvAlloced);
+ if (*prog->argv[argc_l]) {
+ argc_l++;
+ globLastArgument(prog, &argc_l, &argvAlloced);
}
- if (!argc) {
+ if (!argc_l) {
freeJob(job);
return 0;
}
- prog->argv[argc] = NULL;
+ prog->argv[argc_l] = NULL;
if (!returnCommand) {
job->text = xmalloc(strlen(*commandPtr) + 1);
}
*commandPtr = returnCommand;
-
+
return 0;
}
-
-static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
+static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2])
{
- struct job *job;
+ struct job *theJob;
int i;
int nextin, nextout;
int pipefds[2]; /* pipefd[0] is for reading */
struct builtInCommand *x;
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
- const struct BB_applet *a = applets;
+ struct BB_applet search_applet, *applet;
#endif
-
nextin = 0, nextout = 1;
for (i = 0; i < newJob->numProgs; i++) {
if ((i + 1) < newJob->numProgs) {
pipe(pipefds);
nextout = pipefds[1];
} else {
- nextout = 1;
+ if (outPipe[1]!=-1) {
+ nextout = outPipe[1];
+ } else {
+ nextout = 1;
+ }
+ }
+
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ if (showXtrace==TRUE) {
+ int j;
+ fprintf(stderr, "+ ");
+ for (j = 0; newJob->progs[i].argv[j]; j++)
+ fprintf(stderr, "%s ", newJob->progs[i].argv[j]);
+ fprintf(stderr, "\n");
}
+#endif
/* Check if the command matches any non-forking builtins */
for (x = bltins; x->cmd; x++) {
- if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
- return (x->function(newJob, jobList));
+ if (strcmp(newJob->progs[i].argv[0], x->cmd) == 0 ) {
+ return(x->function(newJob, jobList));
}
}
if (!(newJob->progs[i].pid = fork())) {
signal(SIGTTOU, SIG_DFL);
+ if (outPipe[1]!=-1) {
+ close(outPipe[0]);
+ }
if (nextin != 0) {
dup2(nextin, 0);
close(nextin);
if (nextout != 1) {
dup2(nextout, 1);
+ dup2(nextout, 2);
close(nextout);
+ close(pipefds[0]);
}
/* explicit redirections override pipes */
/* Check if the command matches any of the other builtins */
for (x = bltins_forking; x->cmd; x++) {
- if (!strcmp(newJob->progs[i].argv[0], x->cmd)) {
+ if (strcmp(newJob->progs[i].argv[0], x->cmd) == 0) {
+ applet_name=x->cmd;
exit (x->function(newJob, jobList));
}
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
- /* Check if the command matches any busybox internal commands here */
- /* TODO: Add matching when paths are appended (i.e. 'cat' currently
- * works, but '/bin/cat' doesn't ) */
- while (a->name != 0) {
- if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
- int argc;
- char** argv=newJob->progs[i].argv;
- for(argc=0;*argv!=NULL; argv++, argc++);
- exit((*(a->main)) (argc, newJob->progs[i].argv));
- }
- a++;
+ /* Check if the command matches any busybox internal
+ * commands ("applets") here. Following discussions from
+ * November 2000 on busybox@opensource.lineo.com, don't use
+ * get_last_path_component(). 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 fill fork and exec /bin/foo, even if
+ * /bin/foo is a symlink to busybox.
+ */
+ search_applet.name = newJob->progs[i].argv[0];
+
+#ifdef BB_FEATURE_SH_BUILTINS_ALWAYS_WIN
+ /* If you enable BB_FEATURE_SH_BUILTINS_ALWAYS_WIN, then
+ * if you run /bin/cat, it will use BusyBox cat even if
+ * /bin/cat exists on the filesystem and is _not_ busybox.
+ * Some systems want this, others do not. Choose wisely. :-)
+ */
+ search_applet.name = get_last_path_component(search_applet.name);
+#endif
+
+ /* Do a binary search to find the applet entry given the name. */
+ applet = bsearch(&search_applet, applets, NUM_APPLETS,
+ sizeof(struct BB_applet), applet_name_compare);
+ if (applet != NULL) {
+ int argc_l;
+ char** argv=newJob->progs[i].argv;
+ for(argc_l=0;*argv!=NULL; argv++, argc_l++);
+ applet_name=applet->name;
+ optind = 1;
+ exit((*(applet->main)) (argc_l, newJob->progs[i].argv));
}
#endif
execvp(newJob->progs[i].argv[0], newJob->progs[i].argv);
fatalError("%s: %s\n", newJob->progs[i].argv[0],
- strerror(errno));
+ strerror(errno));
+ }
+ if (outPipe[1]!=-1) {
+ close(outPipe[1]);
}
/* put our child in the process group whose leader is the
first process in this pipe */
setpgid(newJob->progs[i].pid, newJob->progs[0].pid);
-
if (nextin != 0)
close(nextin);
if (nextout != 1)
newJob->pgrp = newJob->progs[0].pid;
- /* find the ID for the job to use */
+ /* find the ID for the theJob to use */
newJob->jobId = 1;
- for (job = jobList->head; job; job = job->next)
- if (job->jobId >= newJob->jobId)
- newJob->jobId = job->jobId + 1;
+ for (theJob = jobList->head; theJob; theJob = theJob->next)
+ if (theJob->jobId >= newJob->jobId)
+ newJob->jobId = theJob->jobId + 1;
- /* add the job to the list of running jobs */
+ /* add the theJob to the list of running jobs */
if (!jobList->head) {
- job = jobList->head = xmalloc(sizeof(*job));
+ theJob = jobList->head = xmalloc(sizeof(*theJob));
} else {
- for (job = jobList->head; job->next; job = job->next);
- job->next = xmalloc(sizeof(*job));
- job = job->next;
+ for (theJob = jobList->head; theJob->next; theJob = theJob->next);
+ theJob->next = xmalloc(sizeof(*theJob));
+ theJob = theJob->next;
}
- *job = *newJob;
- job->next = NULL;
- job->runningProgs = job->numProgs;
- job->stoppedProgs = 0;
+ *theJob = *newJob;
+ theJob->next = NULL;
+ theJob->runningProgs = theJob->numProgs;
+ theJob->stoppedProgs = 0;
if (inBg) {
- /* we don't wait for background jobs to return -- append it
- to the list of backgrounded jobs and leave it alone */
- printf("[%d] %d\n", job->jobId,
+ /* 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->numProgs - 1].pid);
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ lastBgPid=newJob->progs[newJob->numProgs - 1].pid;
+#endif
} else {
- jobList->fg = job;
+ jobList->fg = theJob;
/* move the new process group into the foreground */
/* suppress messages when run from /linuxrc mag@sysgo.de */
return 0;
}
-static int setupRedirections(struct childProgram *prog)
-{
- int i;
- int openfd;
- int mode = O_RDONLY;
- struct redirectionSpecifier *redir = prog->redirections;
-
- for (i = 0; i < prog->numRedirections; i++, redir++) {
- switch (redir->type) {
- case REDIRECT_INPUT:
- mode = O_RDONLY;
- break;
- case REDIRECT_OVERWRITE:
- mode = O_RDWR | O_CREAT | O_TRUNC;
- break;
- case REDIRECT_APPEND:
- mode = O_RDWR | O_CREAT | O_APPEND;
- break;
- }
-
- openfd = open(redir->filename, mode, 0666);
- 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!) */
- fprintf(stderr, "error opening %s: %s\n", redir->filename,
- strerror(errno));
- return 1;
- }
-
- if (openfd != redir->fd) {
- dup2(openfd, redir->fd);
- close(openfd);
- }
- }
-
- return 0;
-}
-
-
static int busy_loop(FILE * input)
{
char *command;
char *nextCommand = NULL;
- struct jobSet jobList = { NULL, NULL };
struct job newJob;
pid_t parent_pgrp;
int i;
- int status;
int inBg;
+ int status;
+ newJob.jobContext = REGULAR_JOB_CONTEXT;
/* save current owner of TTY so we can restore it on exit */
parent_pgrp = tcgetpgrp(0);
- command = (char *) calloc(BUFSIZ, sizeof(char));
+ command = (char *) xcalloc(BUFSIZ, sizeof(char));
/* don't pay any attention to this signal; it just confuses
things and isn't really meant for shells anyway */
if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
newJob.numProgs) {
- runCommand(&newJob, &jobList, inBg);
- } else {
- nextCommand=NULL;
+ int pipefds[2] = {-1,-1};
+ runCommand(&newJob, &jobList, inBg, pipefds);
+ }
+ else {
+ free(command);
+ command = (char *) xcalloc(BUFSIZ, sizeof(char));
+ nextCommand = NULL;
}
} else {
/* a job is running in the foreground; wait for it */
i = 0;
while (!jobList.fg->progs[i].pid ||
- jobList.fg->progs[i].isStopped) i++;
+ jobList.fg->progs[i].isStopped == 1) i++;
waitpid(jobList.fg->progs[i].pid, &status, WUNTRACED);
jobList.fg->runningProgs--;
jobList.fg->progs[i].pid = 0;
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ lastReturnCode=WEXITSTATUS(status);
+#endif
+#if 0
+ printf("'%s' exited -- return code %d\n", jobList.fg->text, lastReturnCode);
+#endif
if (!jobList.fg->runningProgs) {
/* child exited */
}
-int shell_main(int argc, char **argv)
+#ifdef BB_FEATURE_CLEAN_UP
+void free_memory(void)
{
- FILE *input = stdin;
-
- /* initialize the cwd */
- cwd = (char *) calloc(BUFSIZ, sizeof(char));
- if (cwd == 0) {
- fatalError("out of memory\n");
+ if (promptStr)
+ free(promptStr);
+ if (cwd)
+ free(cwd);
+ if (local_pending_command)
+ free(local_pending_command);
+
+ if (jobList.fg && !jobList.fg->runningProgs) {
+ removeJob(&jobList, jobList.fg);
}
- getcwd(cwd, sizeof(char)*BUFSIZ);
-
-#ifdef BB_FEATURE_SH_COMMAND_EDITING
- cmdedit_init();
- signal(SIGWINCH, win_changed);
- win_changed(0);
+}
#endif
+
+int shell_main(int argc_l, char **argv_l)
+{
+ int opt, interactive=FALSE;
+ FILE *input = stdin;
+ argc = argc_l;
+ argv = argv_l;
+
+
//if (argv[0] && argv[0][0] == '-') {
// builtin_source("/etc/profile");
//}
- if (argc < 2) {
+ while ((opt = getopt(argc_l, argv_l, "cx")) > 0) {
+ switch (opt) {
+ case 'c':
+ input = NULL;
+ if (local_pending_command != 0)
+ fatalError("multiple -c arguments\n");
+ local_pending_command = xstrdup(argv[optind]);
+ optind++;
+ argv = argv+optind;
+ break;
+#ifdef BB_FEATURE_SH_ENVIRONMENT
+ case 'x':
+ showXtrace = TRUE;
+ break;
+#endif
+ case 'i':
+ interactive = TRUE;
+ break;
+ default:
+ usage(shell_usage);
+ }
+ }
+ /* 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 (interactive==TRUE || ( argv[optind]==NULL && input==stdin && isatty(fileno(stdin)) && isatty(fileno(stdout)))) {
+ //fprintf(stdout, "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
+ /* Looks like they want an interactive shell */
fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER, BB_BT);
fprintf(stdout, "Enter 'help' for a list of built-in commands.\n\n");
- } else {
- if (argv[1][0]=='-' && argv[1][1]=='c') {
- int i;
- local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
- if (local_pending_command == 0) {
- fatalError("out of memory\n");
- }
- for(i=2; i<argc; i++)
- {
- if (strlen(local_pending_command) + strlen(argv[i]) >= BUFSIZ) {
- local_pending_command = realloc(local_pending_command,
- strlen(local_pending_command) + strlen(argv[i]));
- if (local_pending_command==NULL)
- fatalError("commands for -c option too long\n");
- }
- strcat(local_pending_command, argv[i]);
- if ( (i + 1) < argc)
- strcat(local_pending_command, " ");
- }
- input = NULL;
-
- }
- else if (argv[1][0]=='-') {
- usage(shell_usage);
- }
- else {
- input = fopen(argv[1], "r");
- if (!input) {
- fatalError("Couldn't open file '%s': %s\n", argv[1],
- strerror(errno));
- }
- }
+ } else if (local_pending_command==NULL) {
+ //fprintf(stdout, "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
+ input = xfopen(argv[optind], "r");
}
+ /* initialize the cwd -- this is never freed...*/
+ cwd=(char*)xmalloc(sizeof(char)*MAX_LINE+1);
+ getcwd(cwd, sizeof(char)*MAX_LINE);
+
+#ifdef BB_FEATURE_CLEAN_UP
+ atexit(free_memory);
+#endif
+
+#ifdef BB_FEATURE_SH_COMMAND_EDITING
+ win_changed(0);
+#endif
+
return (busy_loop(input));
}
projects / oweals / busybox.git / blobdiff