source: MondoRescue/branches/3.3/mindi-busybox/debianutils/which.c@ 3621

/* 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"
//config:   default y
//config:   help
//config:     which is used to find programs in your PATH and
//config:     print out their pathnames.

//applet:IF_WHICH(APPLET(which, BB_DIR_USR_BIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_WHICH) += which.o

//usage:#define which_trivial_usage
//usage:       "[COMMAND]..."
//usage:#define which_full_usage "\n\n"
//usage:       "Locate a COMMAND"
//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;

    env_path = getenv("PATH");
    if (!env_path)
        env_path = bb_default_root_path;

    opt_complementary = "-1"; /* at least one argument */
    getopt32(argv, "a");
    argv += optind;

    do {
        int missing = 1;

        /* If file contains a slash don't use PATH */
        if (strchr(*argv, '/')) {
            if (file_is_executable(*argv)) {
                missing = 0;
                puts(*argv);
            }
        } else {
            char *path;
            char *tmp;
            char *p;

            path = tmp = xstrdup(env_path);
            while ((p = find_executable(*argv, &tmp)) != NULL) {
                missing = 0;
                puts(p);
                free(p);
                if (!option_mask32) /* -a not set */
                    break;
            }
            free(path);
        }
        status |= missing;
    } while (*++argv);

    return status;
}