Annotation of prex/usr/lib/libc/stdlib/getsubopt.c, Revision 1.1.1.1
1.1 nbrk 1: /*-
2: * Copyright (c) 1990, 1993
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: #include <unistd.h>
31: #include <stdlib.h>
32: #include <string.h>
33:
34: /*
35: * The SVID interface to getsubopt provides no way of figuring out which
36: * part of the suboptions list wasn't matched. This makes error messages
37: * tricky... The extern variable suboptarg is a pointer to the token
38: * which didn't match.
39: */
40: char *suboptarg;
41:
42: int
43: getsubopt(optionp, tokens, valuep)
44: char **optionp, **valuep;
45: char * const *tokens;
46: {
47: int cnt;
48: char *p;
49:
50: suboptarg = *valuep = NULL;
51:
52: if (!optionp || !*optionp)
53: return(-1);
54:
55: /* skip leading white-space, commas */
56: for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
57:
58: if (!*p) {
59: *optionp = p;
60: return(-1);
61: }
62:
63: /* save the start of the token, and skip the rest of the token. */
64: for (suboptarg = p;
65: *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
66:
67: if (*p) {
68: /*
69: * If there's an equals sign, set the value pointer, and
70: * skip over the value part of the token. Terminate the
71: * token.
72: */
73: if (*p == '=') {
74: *p = '\0';
75: for (*valuep = ++p;
76: *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
77: if (*p)
78: *p++ = '\0';
79: } else
80: *p++ = '\0';
81: /* Skip any whitespace or commas after this token. */
82: for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
83: }
84:
85: /* set optionp for next round. */
86: *optionp = p;
87:
88: for (cnt = 0; *tokens; ++tokens, ++cnt)
89: if (!strcmp(suboptarg, *tokens))
90: return(cnt);
91: return(-1);
92: }
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