busybox/coreutils/basename.c
Denys Vlasenko 729ecb87bf bbconfig: make it independent from printf functions
function                                             old     new   delta
full_write2_str                                        -      25     +25
full_write1_str                                        -      25     +25
clear_main                                            21      20      -1
telnet_main                                         1488    1477     -11
getty_main                                          1932    1918     -14
full_write22_str                                      25       -     -25
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 0/3 up/down: 50/-51)             Total: -1 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-06-07 14:14:26 +02:00

62 lines
1.6 KiB
C

/* 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 tarball for details.
*/
/* 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.
#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 ((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;
}