source: MondoRescue/branches/3.3/mindi-busybox/coreutils/basename.c@ 3865

/* vi: set sw=4 ts=4: */
/*
 * Mini basename implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Changes:
 * 1) Now checks for too many args.  Need at least one and at most two.
 * 2) Don't check for options, as per SUSv3.
 * 3) Save some space by using strcmp().  Calling strncmp() here was silly.
 */

/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/basename.html */

//kbuild:lib-$(CONFIG_BASENAME) += basename.o

//config:config BASENAME
//config:   bool "basename"
//config:   default y
//config:   help
//config:     basename is used to strip the directory and suffix from filenames,
//config:     leaving just the filename itself. Enable this option if you wish
//config:     to enable the 'basename' utility.

//usage:#define basename_trivial_usage
//usage:       "FILE [SUFFIX]"
//usage:#define basename_full_usage "\n\n"
//usage:       "Strip directory path and .SUFFIX from FILE"
//usage:
//usage:#define basename_example_usage
//usage:       "$ basename /usr/local/bin/foo\n"
//usage:       "foo\n"
//usage:       "$ basename /usr/local/bin/\n"
//usage:       "bin\n"
//usage:       "$ basename /foo/bar.txt .txt\n"
//usage:       "bar"

#include "libbb.h"

/* This is a NOFORK applet. Be very careful! */

int basename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int basename_main(int argc, char **argv)
{
    size_t m, n;
    char *s;

    if (argv[1] && strcmp(argv[1], "--") == 0) {
        argv++;
        argc--;
    }

    if ((unsigned)(argc-2) >= 2) {
        bb_show_usage();
    }

    /* It should strip slash: /abc/def/ -> def */
    s = bb_get_last_path_component_strip(*++argv);

    m = strlen(s);
    if (*++argv) {
        n = strlen(*argv);
        if ((m > n) && (strcmp(s+m-n, *argv) == 0)) {
            m -= n;
            /*s[m] = '\0'; - redundant */
        }
    }

    /* puts(s) will do, but we can do without stdio this way: */
    s[m++] = '\n';
    /* NB: != is correct here: */
    return full_write(STDOUT_FILENO, s, m) != (ssize_t)m;
}