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/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config WHICH
//config: bool "which (4 kb)"
//config: default y
//config: help
//config: which is used to find programs in your PATH and
//config: print out their pathnames.
// NOTE: For WIN32 this applet is NOEXEC as file_is_win32_exe() and
// find_executable() both allocate memory.
//applet:IF_PLATFORM_MINGW32(IF_WHICH(APPLET_NOEXEC(which, which, BB_DIR_USR_BIN, BB_SUID_DROP, which)))
//applet:IF_PLATFORM_POSIX(IF_WHICH(APPLET_NOFORK(which, which, BB_DIR_USR_BIN, BB_SUID_DROP, which)))
//kbuild:lib-$(CONFIG_WHICH) += which.o
//usage:#define which_trivial_usage
//usage: "[-a] COMMAND..."
//usage:#define which_full_usage "\n\n"
//usage: "Locate COMMAND\n"
//usage: "\n -a Show all matches"
//usage:
//usage:#define which_example_usage
//usage: "$ which login\n"
//usage: "/bin/login\n"
#include "libbb.h"
int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int which_main(int argc UNUSED_PARAM, char **argv)
{
const char *env_path;
int status = 0;
#if ENABLE_PLATFORM_MINGW32 && ENABLE_FEATURE_SH_STANDALONE
/* 'Which' in argv[0] indicates we were run from a standalone shell */
int sh_standalone = argv[0][0] == 'W';
#endif
env_path = getenv("PATH");
if (!env_path)
env_path = bb_default_root_path;
getopt32(argv, "^" "a" "\0" "-1"/*at least one arg*/);
argv += optind;
do {
int missing = 1;
#if ENABLE_PLATFORM_MINGW32 && ENABLE_FEATURE_SH_STANDALONE
if (sh_standalone && find_applet_by_name(*argv) >= 0) {
missing = 0;
puts(applet_to_exe(*argv));
if (!option_mask32) /* -a not set */
break;
}
#endif
#if !ENABLE_PLATFORM_MINGW32
/* If file contains a slash don't use PATH */
if (strchr(*argv, '/')) {
if (file_is_executable(*argv)) {
missing = 0;
puts(*argv);
}
#else
if (has_path(*argv)) {
char *path = file_is_win32_exe(*argv);
if (path) {
missing = 0;
puts(bs_to_slash(path));
}
else if (unix_path(*argv)) {
const char *name = bb_basename(*argv);
# if ENABLE_FEATURE_SH_STANDALONE
if (sh_standalone && find_applet_by_name(name) >= 0) {
missing = 0;
puts(name);
} else
# endif
{
argv[0] = (char *)name;
goto try_PATH;
}
}
#endif
} else {
const char *path;
char *p;
#if ENABLE_PLATFORM_MINGW32
try_PATH:
#endif
path = env_path;
/* NOFORK NB: xmalloc inside find_executable(), must have no allocs above! */
while ((p = find_executable(*argv, &path)) != NULL) {
missing = 0;
#if ENABLE_PLATFORM_MINGW32
puts(bs_to_slash(p));
#else
puts(p);
#endif
free(p);
if (!option_mask32) /* -a not set */
break;
}
}
status |= missing;
} while (*++argv);
return status;
}
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