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/* vi: set sw=4 ts=4: */
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include "busybox.h"
#ifdef BB_LOCALE_SUPPORT
#include <locale.h>
#endif
int been_there_done_that = 0; /* Also used in applets.c */
const char *applet_name;
#ifdef BB_FEATURE_INSTALLER
/*
* directory table
* this should be consistent w/ the enum, busybox.h::Location,
* or else...
*/
static char* install_dir[] = {
"/",
"/bin",
"/sbin",
"/usr/bin",
"/usr/sbin",
};
/* abstract link() */
typedef int (*__link_f)(const char *, const char *);
/*
* Where in the filesystem is this busybox?
* [return]
* malloc'd string w/ full pathname of busybox's location
* NULL on failure
*/
static char *busybox_fullpath()
{
pid_t pid;
char path[256];
char proc[256];
int len;
pid = getpid();
sprintf(proc, "/proc/%d/exe", pid);
len = readlink(proc, path, 256);
if (len != -1) {
path[len] = 0;
} else {
perror_msg("%s", proc);
return NULL;
}
return strdup(path);
}
/* create (sym)links for each applet */
static void install_links(const char *busybox, int use_symbolic_links)
{
__link_f Link = link;
char *fpc;
int i;
int rc;
if (use_symbolic_links)
Link = symlink;
for (i = 0; applets[i].name != NULL; i++) {
fpc = concat_path_file(
install_dir[applets[i].location], applets[i].name);
rc = Link(busybox, fpc);
if (rc!=0 && errno!=EEXIST) {
perror_msg("%s", fpc);
}
free(fpc);
}
}
#endif /* BB_FEATURE_INSTALLER */
int main(int argc, char **argv)
{
const char *s;
for (s = applet_name = argv[0]; *s != '\0';) {
if (*s++ == '/')
applet_name = s;
}
#ifdef BB_SH
/* Add in a special case hack -- whenever **argv == '-'
* (i.e. '-su' or '-sh') always invoke the shell */
if (**argv == '-' && *(*argv+1)!= '-') {
applet_name = "sh";
}
#endif
#ifdef BB_LOCALE_SUPPORT
if(getpid()!=1) /* Do not set locale for `init' */
setlocale(LC_ALL, "");
#endif
run_applet_by_name(applet_name, argc, argv);
error_msg_and_die("applet not found");
}
int busybox_main(int argc, char **argv)
{
int col = 0, len, i;
#ifdef BB_FEATURE_INSTALLER
/*
* This style of argument parsing doesn't scale well
* in the event that busybox starts wanting more --options.
* If someone has a cleaner approach, by all means implement it.
*/
if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
int use_symbolic_links = 0;
int rc = 0;
char *busybox;
/* to use symlinks, or not to use symlinks... */
if (argc > 2) {
if ((strcmp(argv[2], "-s") == 0)) {
use_symbolic_links = 1;
}
}
/* link */
busybox = busybox_fullpath();
if (busybox) {
install_links(busybox, use_symbolic_links);
free(busybox);
} else {
rc = 1;
}
return rc;
}
#endif /* BB_FEATURE_INSTALLER */
argc--;
/* If we've already been here once, exit now */
if (been_there_done_that == 1 || argc < 1) {
const struct BB_applet *a = applets;
fprintf(stderr, "%s\n\n"
"Usage: busybox [function] [arguments]...\n"
" or: [function] [arguments]...\n\n"
"\tBusyBox is a multi-call binary that combines many common Unix\n"
"\tutilities into a single executable. Most people will create a\n"
"\tlink to busybox for each function they wish to use, and BusyBox\n"
"\twill act like whatever it was invoked as.\n"
"\nCurrently defined functions:\n", full_version);
while (a->name != 0) {
col +=
fprintf(stderr, "%s%s", ((col == 0) ? "\t" : ", "),
(a++)->name);
if (col > 60 && a->name != 0) {
fprintf(stderr, ",\n");
col = 0;
}
}
fprintf(stderr, "\n\n");
exit(0);
}
/* Flag that we've been here already */
been_there_done_that = 1;
/* Move the command line down a notch */
len = argv[argc] + strlen(argv[argc]) - argv[1];
memmove(argv[0], argv[1], len);
memset(argv[0] + len, 0, argv[1] - argv[0]);
/* Fix up the argv pointers */
len = argv[1] - argv[0];
memmove(argv, argv + 1, sizeof(char *) * (argc + 1));
for (i = 0; i < argc; i++)
argv[i] -= len;
return (main(argc, argv));
}
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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