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#include <capsicum_helpers.h>
33#include <err.h>
34#include <libgen.h>
35#include <limits.h>
36#include <locale.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41#include <wchar.h>
42
43void stripsuffix(char *, const char *, size_t);
44void usage(void);
45
46int
47main(int argc, char **argv)
48{
49	char *p, *suffix;
50	size_t suffixlen;
51	int aflag, ch;
52
53	setlocale(LC_ALL, "");
54
55	if (caph_limit_stdio() < 0 || caph_enter() < 0)
56		err(1, "capsicum");
57
58	aflag = 0;
59	suffix = NULL;
60	suffixlen = 0;
61
62	while ((ch = getopt(argc, argv, "as:")) != -1)
63		switch(ch) {
64		case 'a':
65			aflag = 1;
66			break;
67		case 's':
68			suffix = optarg;
69			break;
70		case '?':
71		default:
72			usage();
73		}
74	argc -= optind;
75	argv += optind;
76
77	if (argc < 1)
78		usage();
79
80	if (!*argv[0]) {
81		printf("\n");
82		exit(0);
83	}
84	if ((p = basename(argv[0])) == NULL)
85		err(1, "%s", argv[0]);
86	if ((suffix == NULL && !aflag) && argc == 2) {
87		suffix = argv[1];
88		argc--;
89	}
90	if (suffix != NULL)
91		suffixlen = strlen(suffix);
92	while (argc--) {
93		if ((p = basename(*argv)) == NULL)
94			err(1, "%s", argv[0]);
95		stripsuffix(p, suffix, suffixlen);
96		argv++;
97		(void)printf("%s\n", p);
98	}
99	exit(0);
100}
101
102void
103stripsuffix(char *p, const char *suffix, size_t suffixlen)
104{
105	char *q, *r;
106	mbstate_t mbs;
107	size_t n;
108
109	if (suffixlen && (q = strchr(p, '\0') - suffixlen) > p &&
110	    strcmp(suffix, q) == 0) {
111		/* Ensure that the match occurred on a character boundary. */
112		memset(&mbs, 0, sizeof(mbs));
113		for (r = p; r < q; r += n) {
114			n = mbrlen(r, MB_LEN_MAX, &mbs);
115			if (n == (size_t)-1 || n == (size_t)-2) {
116				memset(&mbs, 0, sizeof(mbs));
117				n = 1;
118			}
119		}
120		/* Chop off the suffix. */
121		if (q == r)
122			*q = '\0';
123	}
124}
125
126void
127usage(void)
128{
129
130	(void)fprintf(stderr,
131"usage: basename string [suffix]\n"
132"       basename [-a] [-s suffix] string [...]\n");
133	exit(1);
134}
135