source: MondoRescue/branches/3.2/mindi-busybox/debianutils/which.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * Which implementation for busybox
 *
 * 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.
 *
 * Based on which from debianutils
 */

//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)
{
    IF_DESKTOP(int opt;)
    int status = EXIT_SUCCESS;
    char *path;
    char *p;

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

    /* This matches what is seen on e.g. ubuntu.
     * "which" there is a shell script. */
    path = getenv("PATH");
    if (!path) {
        path = (char*)bb_PATH_root_path;
        putenv(path);
        path += 5; /* skip "PATH=" */
    }

    do {
#if ENABLE_DESKTOP
/* Much bloat just to support -a */
        if (strchr(*argv, '/')) {
            if (execable_file(*argv)) {
                puts(*argv);
                continue;
            }
            status = EXIT_FAILURE;
        } else {
            char *path2 = xstrdup(path);
            char *tmp = path2;

            p = find_execable(*argv, &tmp);
            if (!p)
                status = EXIT_FAILURE;
            else {
 print:
                puts(p);
                free(p);
                if (opt) {
                    /* -a: show matches in all PATH components */
                    if (tmp) {
                        p = find_execable(*argv, &tmp);
                        if (p)
                            goto print;
                    }
                }
            }
            free(path2);
        }
#else
/* Just ignoring -a */
        if (strchr(*argv, '/')) {
            if (execable_file(*argv)) {
                puts(*argv);
                continue;
            }
        } else {
            char *path2 = xstrdup(path);
            char *tmp = path2;
            p = find_execable(*argv, &tmp);
            free(path2);
            if (p) {
                puts(p);
                free(p);
                continue;
            }
        }
        status = EXIT_FAILURE;
#endif
    } while (*(++argv) != NULL);

    fflush_stdout_and_exit(status);
}