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/* getsubopt.c --- Parse comma separate list into words, DIGEST-MD5 style.
* Copyright (C) 2002-2025 Simon Josefsson
* Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
* From the GNU C Library, under GNU LGPL version 2.1.
* Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
* Modified for Libgsasl by Simon Josefsson <simon@josefsson.org>
*
* This file is part of GNU SASL Library.
*
* GNU SASL Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* GNU SASL Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GNU SASL Library; if not, see
* <https://www.gnu.org/licenses/>.
*
*/
#include <config.h>
/* Get prototypes. */
#include "parser.h"
/* Get memchr and memcmp. */
#include <string.h>
/* Parse comma separated suboption from *OPTIONP and match against
strings in TOKENS. If found return index and set *VALUEP to
optional value introduced by an equal sign. If the suboption is
not part of TOKENS return in *VALUEP beginning of unknown
suboption. On exit *OPTIONP is set to the beginning of the next
token or at the terminating NUL character.
This function is NOT identical to standard getsubopt! */
int
digest_md5_getsubopt (char **optionp,
const char *const *tokens, char **valuep)
{
char *endp, *vstart;
int cnt;
int inside_quote = 0;
if (**optionp == '\0')
return -1;
/* Find end of next token. */
endp = *optionp;
while (*endp != '\0' && (inside_quote || (!inside_quote && *endp != ',')))
{
if (*endp == '"')
inside_quote = !inside_quote;
endp++;
}
/* Find start of value. */
vstart = memchr (*optionp, '=', endp - *optionp);
if (vstart == NULL)
vstart = endp;
/* Try to match the characters between *OPTIONP and VSTART against
one of the TOKENS. */
for (cnt = 0; tokens[cnt] != NULL; ++cnt)
if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
&& tokens[cnt][vstart - *optionp] == '\0')
{
/* We found the current option in TOKENS. */
*valuep = vstart != endp ? vstart + 1 : NULL;
while (*valuep && (**valuep == ' ' ||
**valuep == '\t' ||
**valuep == '\r' ||
**valuep == '\n' || **valuep == '"'))
(*valuep)++;
if (*endp != '\0')
{
*endp = '\0';
*optionp = endp + 1;
}
else
*optionp = endp;
endp--;
while (*endp == ' ' ||
*endp == '\t' ||
*endp == '\r' || *endp == '\n' || *endp == '"')
*endp-- = '\0';
while (**optionp == ' ' ||
**optionp == '\t' || **optionp == '\r' || **optionp == '\n')
(*optionp)++;
return cnt;
}
/* The current suboption does not match any option. */
*valuep = *optionp;
if (*endp != '\0')
*endp++ = '\0';
*optionp = endp;
while (**optionp == ' ' ||
**optionp == '\t' || **optionp == '\r' || **optionp == '\n')
(*optionp)++;
return -1;
}
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