Annotation of src/usr.bin/dirname/dirname.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: dirname.c,v 1.6 1995/09/02 06:02:25 jtc Exp $ */
2:
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. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1991, 1993, 1994\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95";
45: #endif
46: static char rcsid[] = "$NetBSD: dirname.c,v 1.6 1995/09/02 06:02:25 jtc Exp $";
47: #endif /* not lint */
48:
49: #include <stdio.h>
50: #include <stdlib.h>
51: #include <locale.h>
52: #include <unistd.h>
53:
54: static void usage __P((void));
55:
56: int
57: main(argc, argv)
58: int argc;
59: char **argv;
60: {
61: register char *p;
62: int ch;
63:
64: setlocale(LC_ALL, "");
65:
66: while ((ch = getopt(argc, argv, "")) != -1)
67: switch(ch) {
68: case '?':
69: default:
70: usage();
71: }
72: argc -= optind;
73: argv += optind;
74:
75: if (argc != 1)
76: usage();
77:
78: /*
79: * (1) If string is //, skip steps (2) through (5).
80: * (2) If string consists entirely of slash characters, string
81: * shall be set to a single slash character. In this case,
82: * skip steps (3) through (8).
83: */
84: for (p = *argv;; ++p) {
85: if (!*p) {
86: if (p > *argv)
87: (void)printf("/\n");
88: else
89: (void)printf(".\n");
90: exit(0);
91: }
92: if (*p != '/')
93: break;
94: }
95:
96: /*
97: * (3) If there are any trailing slash characters in string, they
98: * shall be removed.
99: */
100: for (; *p; ++p);
101: while (*--p == '/')
102: continue;
103: *++p = '\0';
104:
105: /*
106: * (4) If there are no slash characters remaining in string,
107: * string shall be set to a single period character. In this
108: * case skip steps (5) through (8).
109: *
110: * (5) If there are any trailing nonslash characters in string,
111: * they shall be removed.
112: */
113: while (--p >= *argv)
114: if (*p == '/')
115: break;
116: ++p;
117: if (p == *argv) {
118: (void)printf(".\n");
119: exit(0);
120: }
121:
122: /*
123: * (6) If the remaining string is //, it is implementation defined
124: * whether steps (7) and (8) are skipped or processed.
125: *
126: * This case has already been handled, as part of steps (1) and (2).
127: */
128:
129: /*
130: * (7) If there are any trailing slash characters in string, they
131: * shall be removed.
132: */
133: while (--p >= *argv)
134: if (*p != '/')
135: break;
136: ++p;
137:
138: /*
139: * (8) If the remaining string is empty, string shall be set to
140: * a single slash character.
141: */
142: *p = '\0';
143: (void)printf("%s\n", p == *argv ? "/" : *argv);
144: exit(0);
145: }
146:
147: static void
148: usage()
149: {
150:
151: (void)fprintf(stderr, "usage: dirname path\n");
152: exit(1);
153: }
154:
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