mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/* sexp-parse.h - S-Exp helper functions
|
|
* Copyright (C) 2002 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GnuPG 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
#ifndef SEXP_PARSE_H
|
|
#define SEXP_PARSE_H
|
|
|
|
#include "../common/util.h"
|
|
|
|
/* Return the length of the next S-Exp part and update the pointer to
|
|
the first data byte. 0 is return on error */
|
|
static inline size_t
|
|
snext (unsigned char const **buf)
|
|
{
|
|
const unsigned char *s;
|
|
int n;
|
|
|
|
s = *buf;
|
|
for (n=0; *s && *s != ':' && digitp (s); s++)
|
|
n = n*10 + atoi_1 (s);
|
|
if (!n || *s != ':')
|
|
return 0; /* we don't allow empty lengths */
|
|
*buf = s+1;
|
|
return n;
|
|
}
|
|
|
|
/* Skip over the S-Expression BUF points to and update BUF to point to
|
|
the chacter right behind. DEPTH gives the initial number of open
|
|
lists and may be passed as a positive number to skip over the
|
|
remainder of an S-Expression if the current position is somewhere
|
|
in an S-Expression. The function may return an error code if it
|
|
encounters an impossible conditions */
|
|
static inline int
|
|
sskip (unsigned char const **buf, int *depth)
|
|
{
|
|
const unsigned char *s = *buf;
|
|
size_t n;
|
|
int d = *depth;
|
|
|
|
while (d > 0)
|
|
{
|
|
if (*s == '(')
|
|
{
|
|
d++;
|
|
s++;
|
|
}
|
|
else if (*s == ')')
|
|
{
|
|
d--;
|
|
s++;
|
|
}
|
|
else
|
|
{
|
|
if (!d)
|
|
return gpg_error (GPG_ERR_INV_SEXP);
|
|
n = snext (&s);
|
|
if (!n)
|
|
return gpg_error (GPG_ERR_INV_SEXP);
|
|
s += n;
|
|
}
|
|
}
|
|
*buf = s;
|
|
*depth = d;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Check whether the the string at the address BUF points to matches
|
|
the token. Return true on match and update BUF to point behind the
|
|
token. */
|
|
static inline int
|
|
smatch (unsigned char const **buf, size_t buflen, const char *token)
|
|
{
|
|
size_t toklen = strlen (token);
|
|
|
|
if (buflen != toklen || memcmp (*buf, token, toklen))
|
|
return 0;
|
|
*buf += toklen;
|
|
return 1;
|
|
}
|
|
|
|
#endif /*SEXP_PARSE_H*/
|