1 /* getsubopt.c --- Parse comma separate list into words, DIGEST-MD5 style.
2 * Copyright (C) 2002-2021 Simon Josefsson
3 * Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
4 * From the GNU C Library, under GNU LGPL version 2.1.
5 * Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
6 * Modified for Libgsasl by Simon Josefsson <simon@josefsson.org>
7 *
8 * This file is part of GNU SASL Library.
9 *
10 * GNU SASL Library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public License
12 * as published by the Free Software Foundation; either version 2.1 of
13 * the License, or (at your option) any later version.
14 *
15 * GNU SASL Library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with GNU SASL Library; if not, write to the Free
22 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
24 *
25 */
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 /* Get prototypes. */
32 #include "parser.h"
33
34 /* Get memchr and memcmp. */
35 #include <string.h>
36
37 /* Parse comma separated suboption from *OPTIONP and match against
38 strings in TOKENS. If found return index and set *VALUEP to
39 optional value introduced by an equal sign. If the suboption is
40 not part of TOKENS return in *VALUEP beginning of unknown
41 suboption. On exit *OPTIONP is set to the beginning of the next
42 token or at the terminating NUL character.
43
44 This function is NOT identical to standard getsubopt! */
45 int
digest_md5_getsubopt(char ** optionp,const char * const * tokens,char ** valuep)46 digest_md5_getsubopt (char **optionp,
47 const char *const *tokens, char **valuep)
48 {
49 char *endp, *vstart;
50 int cnt;
51 int inside_quote = 0;
52
53 if (**optionp == '\0')
54 return -1;
55
56 /* Find end of next token. */
57 endp = *optionp;
58 while (*endp != '\0' && (inside_quote || (!inside_quote && *endp != ',')))
59 {
60 if (*endp == '"')
61 inside_quote = !inside_quote;
62 endp++;
63 }
64
65 /* Find start of value. */
66 vstart = memchr (*optionp, '=', endp - *optionp);
67 if (vstart == NULL)
68 vstart = endp;
69
70 /* Try to match the characters between *OPTIONP and VSTART against
71 one of the TOKENS. */
72 for (cnt = 0; tokens[cnt] != NULL; ++cnt)
73 if (memcmp (*optionp, tokens[cnt], vstart - *optionp) == 0
74 && tokens[cnt][vstart - *optionp] == '\0')
75 {
76 /* We found the current option in TOKENS. */
77 *valuep = vstart != endp ? vstart + 1 : NULL;
78
79 while (*valuep && (**valuep == ' ' ||
80 **valuep == '\t' ||
81 **valuep == '\r' ||
82 **valuep == '\n' || **valuep == '"'))
83 (*valuep)++;
84
85 if (*endp != '\0')
86 {
87 *endp = '\0';
88 *optionp = endp + 1;
89 }
90 else
91 *optionp = endp;
92 endp--;
93 while (*endp == ' ' ||
94 *endp == '\t' ||
95 *endp == '\r' || *endp == '\n' || *endp == '"')
96 *endp-- = '\0';
97 while (**optionp == ' ' ||
98 **optionp == '\t' || **optionp == '\r' || **optionp == '\n')
99 (*optionp)++;
100
101 return cnt;
102 }
103
104 /* The current suboption does not match any option. */
105 *valuep = *optionp;
106
107 if (*endp != '\0')
108 *endp++ = '\0';
109 *optionp = endp;
110 while (**optionp == ' ' ||
111 **optionp == '\t' || **optionp == '\r' || **optionp == '\n')
112 (*optionp)++;
113
114 return -1;
115 }
116