1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1991, 1993, 1994\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif
37
38#if 0
39#ifndef lint
40static char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
41#endif /* not lint */
42#endif
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <capsicum_helpers.h>
48#include <err.h>
49#include <libgen.h>
50#include <limits.h>
51#include <locale.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56#include <wchar.h>
57
58void stripsuffix(char *, const char *, size_t);
59void usage(void);
60
61int
62main(int argc, char **argv)
63{
64	char *p, *suffix;
65	size_t suffixlen;
66	int aflag, ch;
67
68	setlocale(LC_ALL, "");
69
70	if (caph_limit_stdio() < 0 || caph_enter() < 0)
71		err(1, "capsicum");
72
73	aflag = 0;
74	suffix = NULL;
75	suffixlen = 0;
76
77	while ((ch = getopt(argc, argv, "as:")) != -1)
78		switch(ch) {
79		case 'a':
80			aflag = 1;
81			break;
82		case 's':
83			suffix = optarg;
84			break;
85		case '?':
86		default:
87			usage();
88		}
89	argc -= optind;
90	argv += optind;
91
92	if (argc < 1)
93		usage();
94
95	if (!*argv[0]) {
96		printf("\n");
97		exit(0);
98	}
99	if ((p = basename(argv[0])) == NULL)
100		err(1, "%s", argv[0]);
101	if ((suffix == NULL && !aflag) && argc == 2) {
102		suffix = argv[1];
103		argc--;
104	}
105	if (suffix != NULL)
106		suffixlen = strlen(suffix);
107	while (argc--) {
108		if ((p = basename(*argv)) == NULL)
109			err(1, "%s", argv[0]);
110		stripsuffix(p, suffix, suffixlen);
111		argv++;
112		(void)printf("%s\n", p);
113	}
114	exit(0);
115}
116
117void
118stripsuffix(char *p, const char *suffix, size_t suffixlen)
119{
120	char *q, *r;
121	mbstate_t mbs;
122	size_t n;
123
124	if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
125	    strcmp(suffix, q) == 0) {
126		/* Ensure that the match occurred on a character boundary. */
127		memset(&mbs, 0, sizeof(mbs));
128		for (r = p; r < q; r += n) {
129			n = mbrlen(r, MB_LEN_MAX, &mbs);
130			if (n == (size_t)-1 || n == (size_t)-2) {
131				memset(&mbs, 0, sizeof(mbs));
132				n = 1;
133			}
134		}
135		/* Chop off the suffix. */
136		if (q == r)
137			*q = '\0';
138	}
139}
140
141void
142usage(void)
143{
144
145	(void)fprintf(stderr,
146"usage: basename string [suffix]\n"
147"       basename [-a] [-s suffix] string [...]\n");
148	exit(1);
149}
150