#include "cmdedit.h"
#endif
-
+#define MAX_READ 128 /* size of input buffer for `read' builtin */
#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
int (*function) (struct job *, struct jobSet * jobList); /* function ptr */
};
-/* Some function prototypes */
-static int shell_cd(struct job *cmd, struct jobSet *junk);
-static int shell_env(struct job *dummy, struct jobSet *junk);
-static int shell_exit(struct job *cmd, struct jobSet *junk);
-static int shell_fg_bg(struct job *cmd, struct jobSet *jobList);
-static int shell_help(struct job *cmd, struct jobSet *junk);
-static int shell_jobs(struct job *dummy, struct jobSet *jobList);
-static int shell_pwd(struct job *dummy, struct jobSet *junk);
-static int shell_export(struct job *cmd, struct jobSet *junk);
-static int shell_source(struct job *cmd, struct jobSet *jobList);
-static int shell_unset(struct job *cmd, struct jobSet *junk);
-
+/* 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_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_jobs(struct job *dummy, struct jobSet *jobList);
+static int builtin_pwd(struct job *dummy, struct jobSet *junk);
+static int builtin_export(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);
+
+
+/* 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, int *isBg);
/* Table of built-in functions */
static struct builtInCommand bltins[] = {
- {"bg", "Resume a job in the background", "bg [%%job]", shell_fg_bg},
- {"cd", "Change working directory", "cd [dir]", shell_cd},
- {"exit", "Exit from shell()", "exit", shell_exit},
- {"fg", "Bring job into the foreground", "fg [%%job]", shell_fg_bg},
- {"jobs", "Lists the active jobs", "jobs", shell_jobs},
- {"export", "Set environment variable", "export [VAR=value]", shell_export},
- {"unset", "Unset environment variable", "unset VAR", shell_unset},
+ {"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}
};
/* Table of built-in functions */
static struct builtInCommand bltins_forking[] = {
- {"env", "Print all environment variables", "env", shell_env},
- {"pwd", "Print current directory", "pwd", shell_pwd},
- {".", "Source-in and run commands in a file", ". filename", shell_source},
- {"help", "List shell built-in commands", "help", shell_help},
+ {"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}
};
static const char shell_usage[] =
-
- "sh [FILE]...\n"
+ "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 cwd[1024];
static char *prompt = "# ";
+static char *cwd = NULL;
+static char *local_pending_command = NULL;
#ifdef BB_FEATURE_SH_COMMAND_EDITING
void win_changed(int sig)
/* built-in 'cd <path>' handler */
-static int shell_cd(struct job *cmd, struct jobSet *junk)
+static int builtin_cd(struct job *cmd, struct jobSet *junk)
{
char *newdir;
}
/* built-in 'env' handler */
-static int shell_env(struct job *dummy, struct jobSet *junk)
+static int builtin_env(struct job *dummy, struct jobSet *junk)
{
char **e;
}
/* built-in 'exit' handler */
-static int shell_exit(struct job *cmd, struct jobSet *junk)
+static int builtin_exit(struct job *cmd, struct jobSet *junk)
{
if (!cmd->progs[0].argv[1] == 1)
exit TRUE;
}
/* built-in 'fg' and 'bg' handler */
-static int shell_fg_bg(struct job *cmd, struct jobSet *jobList)
+static int builtin_fg_bg(struct job *cmd, struct jobSet *jobList)
{
int i, jobNum;
struct job *job=NULL;
if (*cmd->progs[0].argv[0] == 'f') {
/* Make this job the foreground job */
- if (tcsetpgrp(0, job->pgrp))
- perror("tcsetpgrp");
+ /* suppress messages when run from /linuxrc mag@sysgo.de */
+ if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY)
+ perror("tcsetpgrp");
jobList->fg = job;
}
}
/* built-in 'help' handler */
-static int shell_help(struct job *cmd, struct jobSet *junk)
+static int builtin_help(struct job *cmd, struct jobSet *junk)
{
struct builtInCommand *x;
}
/* built-in 'jobs' handler */
-static int shell_jobs(struct job *dummy, struct jobSet *jobList)
+static int builtin_jobs(struct job *dummy, struct jobSet *jobList)
{
struct job *job;
char *statusString;
/* built-in 'pwd' handler */
-static int shell_pwd(struct job *dummy, struct jobSet *junk)
+static int builtin_pwd(struct job *dummy, struct jobSet *junk)
{
getcwd(cwd, sizeof(cwd));
fprintf(stdout, "%s\n", cwd);
}
/* built-in 'export VAR=value' handler */
-static int shell_export(struct job *cmd, struct jobSet *junk)
+static int builtin_export(struct job *cmd, struct jobSet *junk)
{
int res;
if (!cmd->progs[0].argv[1] == 1) {
- return (shell_env(cmd, junk));
+ return (builtin_env(cmd, junk));
}
res = putenv(cmd->progs[0].argv[1]);
if (res)
return (res);
}
+/* built-in 'read VAR' handler */
+static int builtin_read(struct job *cmd, struct jobSet *junk)
+{
+ int res = 0, len, newlen;
+ char *s;
+ char string[MAX_READ];
+
+ if (cmd->progs[0].argv[1]) {
+ /* argument (VAR) given: put "VAR=" into buffer */
+ strcpy(string, cmd->progs[0].argv[1]);
+ len = strlen(string);
+ string[len++] = '=';
+ string[len] = '\0';
+ fgets(&string[len], sizeof(string) - len, stdin); /* read string */
+ newlen = strlen(string);
+ if(newlen > len)
+ string[--newlen] = '\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;
+ if((s = strdup(string)))
+ res = putenv(s);
+ if (res)
+ fprintf(stdout, "read: %s\n", strerror(errno));
+ }
+ else
+ fgets(string, sizeof(string), stdin);
+
+ return (res);
+}
+
/* Built-in '.' handler (read-in and execute commands from file) */
-static int shell_source(struct job *cmd, struct jobSet *junk)
+static int builtin_source(struct job *cmd, struct jobSet *junk)
{
FILE *input;
int status;
}
/* built-in 'unset VAR' handler */
-static int shell_unset(struct job *cmd, struct jobSet *junk)
+static int builtin_unset(struct job *cmd, struct jobSet *junk)
{
if (!cmd->progs[0].argv[1] == 1) {
fprintf(stdout, "unset: parameter required.\n");
static int getCommand(FILE * source, char *command)
{
+ if (source == NULL) {
+ if (local_pending_command) {
+ /* a command specified (-c option): return it & mark it done */
+ strcpy(command, local_pending_command);
+ free(local_pending_command);
+ local_pending_command = NULL;
+ return 0;
+ }
+ return 1;
+ }
+
if (source == stdin) {
#ifdef BB_FEATURE_SH_COMMAND_EDITING
int len;
int rc;
int flags;
int i;
- char *src, *dst;
+ char *src, *dst, *var;
if (argc > 1) { /* cmd->globResult is already initialized */
flags = GLOB_APPEND;
flags = 0;
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) {
job->progs = malloc(sizeof(*job->progs));
/* We set the argv elements to point inside of this string. The
- memory is freed by freeJob().
+ memory is freed by freeJob(). 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 = calloc(1, strlen(*commandPtr) + 1);
+ job->cmdBuf = command = calloc(1, 2*strlen(*commandPtr) + 1);
job->text = NULL;
prog = job->progs;
sizeof(*prog->argv) *
argvAlloced);
}
- prog->argv[argc] = buf;
-
globLastArgument(prog, &argc, &argvAlloced);
+ prog->argv[argc] = buf;
}
} else
switch (*src) {
if (*chptr && *prog->argv[argc]) {
buf++, argc++;
globLastArgument(prog, &argc, &argvAlloced);
+ prog->argv[argc] = buf;
}
}
int nextin, nextout;
int pipefds[2]; /* pipefd[0] is for reading */
struct builtInCommand *x;
-#ifdef BB_FEATURE_STANDALONE_SHELL
+#ifdef BB_FEATURE_SH_STANDALONE_SHELL
const struct BB_applet *a = applets;
#endif
nextout = 1;
}
- /* Match any built-ins here */
+ /* 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));
/* explicit redirections override pipes */
setupRedirections(newJob.progs + i);
- /* Match any built-ins here */
+ /* 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)) {
exit (x->function(&newJob, jobList));
}
}
-#ifdef BB_FEATURE_STANDALONE_SHELL
- /* Handle busybox internals here */
+#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;
jobList->fg = job;
/* move the new process group into the foreground */
- if (tcsetpgrp(0, newJob.pgrp))
+ /* suppress messages when run from /linuxrc mag@sysgo.de */
+ if (tcsetpgrp(0, newJob.pgrp) && errno != ENOTTY)
perror("tcsetpgrp");
}
char *nextCommand = NULL;
struct jobSet jobList = { NULL, NULL };
struct job newJob;
+ pid_t parent_pgrp;
int i;
int status;
int inBg;
+ /* save current owner of TTY so we can restore it on exit */
+ parent_pgrp = tcgetpgrp(0);
+
command = (char *) calloc(BUFSIZ, sizeof(char));
/* don't pay any attention to this signal; it just confuses
removeJob(&jobList, jobList.fg);
jobList.fg = NULL;
-
- /* move the shell to the foreground */
- if (tcsetpgrp(0, getpid()))
- perror("tcsetpgrp");
}
} else {
/* the child was stopped */
if (!jobList.fg) {
/* move the shell to the foreground */
- if (tcsetpgrp(0, getpid()))
- perror("tcsetpgrp");
+ /* suppress messages when run from /linuxrc mag@sysgo.de */
+ if (tcsetpgrp(0, getpid()) && errno != ENOTTY)
+ perror("tcsetpgrp");
}
}
}
free(command);
+ /* return controlling TTY back to parent process group before exiting */
+ if (tcsetpgrp(0, parent_pgrp))
+ perror("tcsetpgrp");
+
+ /* return exit status if called with "-c" */
+ if (input == NULL && WIFEXITED(status))
+ return WEXITSTATUS(status);
+
return 0;
}
{
FILE *input = stdin;
- if (argc > 2) {
- usage(shell_usage);
- }
/* initialize the cwd */
- getcwd(cwd, sizeof(cwd));
+ cwd = (char *) calloc(BUFSIZ, sizeof(char));
+ if (cwd == 0) {
+ fatalError("sh: out of memory\n");
+ }
+ getcwd(cwd, sizeof(char)*BUFSIZ);
#ifdef BB_FEATURE_SH_COMMAND_EDITING
cmdedit_init();
#endif
//if (argv[0] && argv[0][0] == '-') {
- // shell_source("/etc/profile");
+ // builtin_source("/etc/profile");
//}
if (argc < 2) {
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]=='-') {
- usage("sh\n\nlash -- the BusyBox LAme SHell (command interpreter)\n");
+ if (argv[1][0]=='-' && argv[1][1]=='c') {
+ int i;
+ local_pending_command = (char *) calloc(BUFSIZ, sizeof(char));
+ if (local_pending_command == 0) {
+ fatalError("sh: 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("sh: commands for -c option too long\n");
+ }
+ strcat(local_pending_command, argv[i]);
+ if ( (i + 1) < argc)
+ strcat(local_pending_command, " ");
+ }
+ input = NULL;
+
}
- input = fopen(argv[1], "r");
- if (!input) {
- fatalError("sh: Couldn't open file '%s': %s\n", argv[1],
- strerror(errno));
+ else if (argv[1][0]=='-') {
+ usage(shell_usage);
+ }
+ else {
+ input = fopen(argv[1], "r");
+ if (!input) {
+ fatalError("sh: Couldn't open file '%s': %s\n", argv[1],
+ strerror(errno));
+ }
}
}
projects / oweals / busybox.git / blobdiff