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99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/* sexp-parse.h - S-Exp helper functions
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* Copyright (C) 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef SEXP_PARSE_H
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#define SEXP_PARSE_H
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#include "../common/util.h"
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/* Return the length of the next S-Exp part and update the pointer to
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the first data byte. 0 is return on error */
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static inline size_t
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snext (unsigned char const **buf)
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{
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const unsigned char *s;
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int n;
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s = *buf;
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for (n=0; *s && *s != ':' && digitp (s); s++)
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n = n*10 + atoi_1 (s);
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if (!n || *s != ':')
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return 0; /* we don't allow empty lengths */
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*buf = s+1;
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return n;
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}
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/* Skip over the S-Expression BUF points to and update BUF to point to
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the chacter right behind. DEPTH gives the initial number of open
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lists and may be passed as a positive number to skip over the
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remainder of an S-Expression if the current position is somewhere
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in an S-Expression. The function may return an error code if it
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encounters an impossible conditions */
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static inline int
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sskip (unsigned char const **buf, int *depth)
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{
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const unsigned char *s = *buf;
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size_t n;
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int d = *depth;
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while (d > 0)
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{
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if (*s == '(')
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{
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d++;
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s++;
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}
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else if (*s == ')')
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{
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d--;
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s++;
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}
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else
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{
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if (!d)
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return gpg_error (GPG_ERR_INV_SEXP);
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n = snext (&s);
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if (!n)
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return gpg_error (GPG_ERR_INV_SEXP);
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s += n;
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}
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}
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*buf = s;
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*depth = d;
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return 0;
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}
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/* Check whether the the string at the address BUF points to matches
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the token. Return true on match and update BUF to point behind the
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token. */
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static inline int
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smatch (unsigned char const **buf, size_t buflen, const char *token)
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{
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size_t toklen = strlen (token);
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if (buflen != toklen || memcmp (*buf, token, toklen))
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return 0;
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*buf += toklen;
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return 1;
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}
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#endif /*SEXP_PARSE_H*/
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