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fbdeb2fb WJ |
1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * 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. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)basename.c 5.1 (Berkeley) 3/9/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <stdio.h> | |
45 | #include <stdlib.h> | |
46 | #include <string.h> | |
47 | ||
48 | main(argc, argv) | |
49 | int argc; | |
50 | char **argv; | |
51 | { | |
52 | extern int optind; | |
53 | register char *p; | |
54 | int ch; | |
55 | ||
56 | while ((ch = getopt(argc, argv, "")) != EOF) | |
57 | switch(ch) { | |
58 | case '?': | |
59 | default: | |
60 | usage(); | |
61 | } | |
62 | argc -= optind; | |
63 | argv += optind; | |
64 | ||
65 | if (argc != 1 && argc != 2) | |
66 | usage(); | |
67 | ||
68 | /* | |
69 | * (1) If string is // it is implementation defined whether steps (2) | |
70 | * through (5) are skipped or processed. | |
71 | * | |
72 | * (2) If string consists entirely of slash characters, string shall | |
73 | * be set to a single slash character. In this case, skip steps | |
74 | * (3) through (5). | |
75 | */ | |
76 | for (p = *argv;; ++p) { | |
77 | if (!*p) { | |
78 | if (p > *argv) | |
79 | (void)printf("/\n"); | |
80 | else | |
81 | (void)printf("\n"); | |
82 | exit(0); | |
83 | } | |
84 | if (*p != '/') | |
85 | break; | |
86 | } | |
87 | ||
88 | /* | |
89 | * (3) If there are any trailing slash characters in string, they | |
90 | * shall be removed. | |
91 | */ | |
92 | for (; *p; ++p); | |
93 | while (*--p == '/'); | |
94 | *++p = '\0'; | |
95 | ||
96 | /* | |
97 | * (4) If there are any slash characters remaining in string, the | |
98 | * prefix of string up to an including the last slash character | |
99 | * in string shall be removed. | |
100 | */ | |
101 | while (--p >= *argv) | |
102 | if (*p == '/') | |
103 | break; | |
104 | ++p; | |
105 | ||
106 | /* | |
107 | * (5) If the suffix operand is present, is not identical to the | |
108 | * characters remaining in string, and is identical to a suffix | |
109 | * of the characters remaining in string, the suffix suffix | |
110 | * shall be removed from string. | |
111 | */ | |
112 | if (*++argv) { | |
113 | int suffixlen, stringlen, off; | |
114 | ||
115 | suffixlen = strlen(*argv); | |
116 | stringlen = strlen(p); | |
117 | ||
118 | if (suffixlen < stringlen) { | |
119 | off = stringlen - suffixlen; | |
120 | if (!strcmp(p + off, *argv)) | |
121 | p[off] = '\0'; | |
122 | } | |
123 | } | |
124 | (void)printf("%s\n", p); | |
125 | exit(0); | |
126 | } | |
127 | ||
128 | usage() | |
129 | { | |
130 | (void)fprintf(stderr, "usage: basename string [suffix]\n"); | |
131 | exit(1); | |
132 | } |