xref: /freebsd/usr.bin/basename/basename.c (revision d6b92ffa)
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  * 3. 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
31 static 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
38 static char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
39 #endif /* not lint */
40 #endif
41 
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
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 
56 void stripsuffix(char *, const char *, size_t);
57 void usage(void);
58 
59 int
60 main(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 
115 void
116 stripsuffix(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 
139 void
140 usage(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