Annotation of src/usr.bin/dirname/dirname.c, Revision 1.2
1.2 ! deraadt 1: /* $OpenBSD: dirname.c,v 1.6 1995/09/02 06:02:25 jtc Exp $ */
1.1 deraadt 2: /* $NetBSD: dirname.c,v 1.6 1995/09/02 06:02:25 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[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95";
46: #endif
1.2 ! deraadt 47: static char rcsid[] = "$OpenBSD: dirname.c,v 1.6 1995/09/02 06:02:25 jtc Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: #include <stdio.h>
51: #include <stdlib.h>
52: #include <locale.h>
53: #include <unistd.h>
54:
55: static void usage __P((void));
56:
57: int
58: main(argc, argv)
59: int argc;
60: char **argv;
61: {
62: register char *p;
63: int ch;
64:
65: setlocale(LC_ALL, "");
66:
67: while ((ch = getopt(argc, argv, "")) != -1)
68: switch(ch) {
69: case '?':
70: default:
71: usage();
72: }
73: argc -= optind;
74: argv += optind;
75:
76: if (argc != 1)
77: usage();
78:
79: /*
80: * (1) If string is //, skip steps (2) through (5).
81: * (2) If string consists entirely of slash characters, string
82: * shall be set to a single slash character. In this case,
83: * skip steps (3) through (8).
84: */
85: for (p = *argv;; ++p) {
86: if (!*p) {
87: if (p > *argv)
88: (void)printf("/\n");
89: else
90: (void)printf(".\n");
91: exit(0);
92: }
93: if (*p != '/')
94: break;
95: }
96:
97: /*
98: * (3) If there are any trailing slash characters in string, they
99: * shall be removed.
100: */
101: for (; *p; ++p);
102: while (*--p == '/')
103: continue;
104: *++p = '\0';
105:
106: /*
107: * (4) If there are no slash characters remaining in string,
108: * string shall be set to a single period character. In this
109: * case skip steps (5) through (8).
110: *
111: * (5) If there are any trailing nonslash characters in string,
112: * they shall be removed.
113: */
114: while (--p >= *argv)
115: if (*p == '/')
116: break;
117: ++p;
118: if (p == *argv) {
119: (void)printf(".\n");
120: exit(0);
121: }
122:
123: /*
124: * (6) If the remaining string is //, it is implementation defined
125: * whether steps (7) and (8) are skipped or processed.
126: *
127: * This case has already been handled, as part of steps (1) and (2).
128: */
129:
130: /*
131: * (7) If there are any trailing slash characters in string, they
132: * shall be removed.
133: */
134: while (--p >= *argv)
135: if (*p != '/')
136: break;
137: ++p;
138:
139: /*
140: * (8) If the remaining string is empty, string shall be set to
141: * a single slash character.
142: */
143: *p = '\0';
144: (void)printf("%s\n", p == *argv ? "/" : *argv);
145: exit(0);
146: }
147:
148: static void
149: usage()
150: {
151:
152: (void)fprintf(stderr, "usage: dirname path\n");
153: exit(1);
154: }
155:
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