basename.c revision 332463 
1/*-
2 * Copyright (c) 1991, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1991, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: stable/11/usr.bin/basename/basename.c 332463 2018-04-13 03:30:10Z kevans $");
44
45#include <capsicum_helpers.h>
46#include <err.h>
47#include <libgen.h>
48#include <limits.h>
49#include <locale.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include <wchar.h>
55
56void stripsuffix(char *, const char *, size_t);
57void usage(void);
58
59int
60main(int argc, char **argv)
61{
62	char *p, *suffix;
63	size_t suffixlen;
64	int aflag, ch;
65
66	setlocale(LC_ALL, "");
67
68	if (caph_limit_stdio() < 0 || (cap_enter() < 0 && errno != ENOSYS))
69		err(1, "capsicum");
70
71	aflag = 0;
72	suffix = NULL;
73	suffixlen = 0;
74
75	while ((ch = getopt(argc, argv, "as:")) != -1)
76		switch(ch) {
77		case 'a':
78			aflag = 1;
79			break;
80		case 's':
81			suffix = optarg;
82			break;
83		case '?':
84		default:
85			usage();
86		}
87	argc -= optind;
88	argv += optind;
89
90	if (argc < 1)
91		usage();
92
93	if (!*argv[0]) {
94		printf("\n");
95		exit(0);
96	}
97	if ((p = basename(argv[0])) == NULL)
98		err(1, "%s", argv[0]);
99	if ((suffix == NULL && !aflag) && argc == 2) {
100		suffix = argv[1];
101		argc--;
102	}
103	if (suffix != NULL)
104		suffixlen = strlen(suffix);
105	while (argc--) {
106		if ((p = basename(*argv)) == NULL)
107			err(1, "%s", argv[0]);
108		stripsuffix(p, suffix, suffixlen);
109		argv++;
110		(void)printf("%s\n", p);
111	}
112	exit(0);
113}
114
115void
116stripsuffix(char *p, const char *suffix, size_t suffixlen)
117{
118	char *q, *r;
119	mbstate_t mbs;
120	size_t n;
121
122	if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
123	    strcmp(suffix, q) == 0) {
124		/* Ensure that the match occurred on a character boundary. */
125		memset(&mbs, 0, sizeof(mbs));
126		for (r = p; r < q; r += n) {
127			n = mbrlen(r, MB_LEN_MAX, &mbs);
128			if (n == (size_t)-1 || n == (size_t)-2) {
129				memset(&mbs, 0, sizeof(mbs));
130				n = 1;
131			}
132		}
133		/* Chop off the suffix. */
134		if (q == r)
135			*q = '\0';
136	}
137}
138
139void
140usage(void)
141{
142
143	(void)fprintf(stderr,
144"usage: basename string [suffix]\n"
145"       basename [-a] [-s suffix] string [...]\n");
146	exit(1);
147}
148