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/* vi: set sw=4 ts=4: */
/*
* BusyBox' main applet dispatcher.
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
#ifdef BB_NOMMU
smallint re_execed;
#endif
#ifdef CONFIG_FEATURE_INSTALLER
/*
* directory table
* this should be consistent w/ the enum, busybox.h::Location,
* or else...
*/
static const char usr_bin [] = "/usr/bin";
static const char usr_sbin[] = "/usr/sbin";
static const char* const install_dir[] = {
&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
&usr_bin [4], /* "/bin" */
&usr_sbin[4], /* "/sbin" */
usr_bin,
usr_sbin
};
/* abstract link() */
typedef int (*link_func)(const char *, const char *);
/* create (sym)links for each applet */
static void install_links(const char *busybox, int use_symbolic_links)
{
link_func lf = link;
char *fpc;
int i;
int rc;
if (use_symbolic_links)
lf = symlink;
for (i = 0; applets[i].name != NULL; i++) {
fpc = concat_path_file(
install_dir[applets[i].location],
applets[i].name);
rc = lf(busybox, fpc);
if (rc != 0 && errno != EEXIST) {
bb_perror_msg("%s", fpc);
}
free(fpc);
}
}
#else
#define install_links(x,y)
#endif /* CONFIG_FEATURE_INSTALLER */
int main(int argc, char **argv)
{
const char *s;
#ifdef BB_NOMMU
/* NOMMU re-exec trick sets high-order bit in first byte of name */
if (argv[0][0] & 0x80) {
re_execed = 1;
argv[0][0] &= 0x7f;
}
#endif
applet_name = argv[0];
if (*applet_name == '-')
applet_name++;
while ((s = strchr(applet_name, '/')))
applet_name = s + 1;
/* Set locale for everybody except 'init' */
if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
setlocale(LC_ALL, "");
run_applet_by_name(applet_name, argc, argv);
bb_error_msg_and_die("applet not found");
}
int busybox_main(int argc, char **argv);
int busybox_main(int argc, char **argv)
{
/*
* 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 (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
int use_symbolic_links = 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 */
// XXX: FIXME: this is broken. Why not just use argv[0] ?
busybox = xmalloc_readlink_or_warn("/proc/self/exe");
if (!busybox)
return 1;
install_links(busybox, use_symbolic_links);
if (ENABLE_FEATURE_CLEAN_UP)
free(busybox);
return 0;
}
/* Deal with --help. (Also print help when called with no arguments) */
if (argc == 1 || !strcmp(argv[1], "--help") ) {
if (argc > 2) {
applet_name = argv[2];
run_applet_by_name(applet_name, 2, argv);
} else {
const struct BB_applet *a;
int col, output_width;
output_width = 80 - sizeof("start-stop-daemon, ") - 8;
if (ENABLE_FEATURE_AUTOWIDTH) {
/* Obtain the terminal width. */
get_terminal_width_height(0, &output_width, NULL);
/* leading tab and room to wrap */
output_width -= sizeof("start-stop-daemon, ") + 8;
}
printf("%s\n"
"Copyright (C) 1998-2006 Erik Andersen, Rob Landley, and others.\n"
"Licensed under GPLv2. See source distribution for full notice.\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", bb_msg_full_version);
col = 0;
for (a = applets; a->name;) {
col += printf("%s%s", (col ? ", " : "\t"), a->name);
a++;
if (col > output_width && a->name) {
puts(",");
col = 0;
}
}
puts("\n");
return 0;
}
} else run_applet_by_name(argv[1], argc - 1, argv + 1);
bb_error_msg_and_die("applet not found");
}
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