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b008274afd
We better do this once and for all instead of cluttering all future commits with diffs of trailing white spaces. In the majority of cases blank or single lines are affected and thus this change won't disturb a git blame too much. For future commits the pre-commit scripts checks that this won't happen again.
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* sexp-parse.h - S-Exp helper functions
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* Copyright (C) 2002, 2003, 2007 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 3 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, see <http://www.gnu.org/licenses/>.
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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 <gpg-error.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 returned 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 != ':' && (*s >= '0' && *s <= '9'); s++)
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n = n*10 + (*s - '0');
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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 condition. */
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static inline gpg_error_t
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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. Return false and do not update the buffer if it does not
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match. */
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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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/* Format VALUE for use as the length indicatior of an S-expression.
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The caller needs to provide a buffer HELP_BUFFER wth a length of
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HELP_BUFLEN. The return value is a pointer into HELP_BUFFER with
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the formatted length string. The colon and a trailing nul are
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appended. HELP_BUFLEN must be at least 3 - a more useful value is
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15. If LENGTH is not NULL, the LENGTH of the resulting string
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(excluding the terminating nul) is stored at that address. */
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static inline char *
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smklen (char *help_buffer, size_t help_buflen, size_t value, size_t *length)
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{
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char *p = help_buffer + help_buflen;
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if (help_buflen >= 3)
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{
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*--p = 0;
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*--p = ':';
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do
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{
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*--p = '0' + (value % 10);
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value /= 10;
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}
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while (value && p > help_buffer);
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}
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if (length)
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*length = (help_buffer + help_buflen) - p;
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return p;
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}
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#endif /*SEXP_PARSE_H*/
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