Annotation of src/usr.bin/basename/basename.c, Revision 1.2
1.2 ! deraadt 1: /* $OpenBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $ */
1.1 deraadt 2: /* $NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $ */
3:
4: /*-
5: * Copyright (c) 1991, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1991, 1993, 1994\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95";
46: #endif
1.2 ! deraadt 47: static char rcsid[] = "$OpenBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: #include <stdio.h>
51: #include <stdlib.h>
52: #include <string.h>
53: #include <locale.h>
54: #include <unistd.h>
55:
56: void usage __P((void));
57:
58: int
59: main(argc, argv)
60: int argc;
61: char **argv;
62: {
63: char *p;
64: int ch;
65:
66: setlocale(LC_ALL, "");
67:
68: while ((ch = getopt(argc, argv, "")) != -1)
69: switch(ch) {
70: case '?':
71: default:
72: usage();
73: }
74: argc -= optind;
75: argv += optind;
76:
77: if (argc != 1 && argc != 2)
78: usage();
79:
80: /*
81: * (1) If string is // it is implementation defined whether steps (2)
82: * through (5) are skipped or processed.
83: *
84: * (2) If string consists entirely of slash characters, string shall
85: * be set to a single slash character. In this case, skip steps
86: * (3) through (5).
87: */
88: for (p = *argv;; ++p) {
89: if (!*p) {
90: if (p > *argv)
91: (void)printf("/\n");
92: else
93: (void)printf("\n");
94: exit(0);
95: }
96: if (*p != '/')
97: break;
98: }
99:
100: /*
101: * (3) If there are any trailing slash characters in string, they
102: * shall be removed.
103: */
104: for (; *p; ++p)
105: continue;
106: while (*--p == '/')
107: continue;
108: *++p = '\0';
109:
110: /*
111: * (4) If there are any slash characters remaining in string, the
112: * prefix of string up to an including the last slash character
113: * in string shall be removed.
114: */
115: while (--p >= *argv)
116: if (*p == '/')
117: break;
118: ++p;
119:
120: /*
121: * (5) If the suffix operand is present, is not identical to the
122: * characters remaining in string, and is identical to a suffix
123: * of the characters remaining in string, the suffix suffix
124: * shall be removed from string.
125: */
126: if (*++argv) {
127: int suffixlen, stringlen, off;
128:
129: suffixlen = strlen(*argv);
130: stringlen = strlen(p);
131:
132: if (suffixlen < stringlen) {
133: off = stringlen - suffixlen;
134: if (!strcmp(p + off, *argv))
135: p[off] = '\0';
136: }
137: }
138: (void)printf("%s\n", p);
139: exit(0);
140: }
141:
142: void
143: usage()
144: {
145:
146: (void)fprintf(stderr, "usage: basename string [suffix]\n");
147: exit(1);
148: }