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deepend
2024-10-10 18:04:47 +00:00
parent 0793775912
commit 2c0c217bb6
58 changed files with 7236 additions and 430 deletions
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77
libuxre/regcomp.c Normal file
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/*
* Changes by Gunnar Ritter, Freiburg i. Br., Germany, November 2002.
*
* Sccsid @(#)regcomp.c 1.6 (gritter) 9/22/03
*/
/* UNIX(R) Regular Expresssion Library
*
* Note: Code is released under the GNU LGPL
*
* Copyright (C) 2001 Caldera International, Inc.
*
* This 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 of the License, or (at your option) any later version.
*
* This 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 this library; if not, write to:
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* #include "synonyms.h" */
#include "re.h"
/* #pragma weak regcomp = _regcomp */
int
regcomp(regex_t *ep, const char *pat, int flags)
{
Tree *tp;
Lex lex;
if ((tp=libuxre_regparse(&lex, (const unsigned char *)pat, flags)) == 0)
goto out;
ep->re_nsub = lex.nleft;
ep->re_flags = lex.flags & ~(REG_NOTBOL | REG_NOTEOL | REG_NONEMPTY);
ep->re_col = lex.col;
ep->re_mb_cur_max = lex.mb_cur_max;
/*
* Build the engine(s). The factors determining which are built:
* 1. If the pattern built insists on an NFA, then only build NFA.
* 2. If flags include REG_NOSUB or REG_ONESUB and not (1),
* then only build DFA.
* 3. Otherwise, build both.
* Since libuxre_regdfacomp() modifies the tree and libuxre_regnfacomp()
* doesn't, libuxre_regnfacomp() must be called first, if both are to
* be called.
*/
if (ep->re_nsub != 0 && (flags & (REG_NOSUB | REG_ONESUB)) == 0
|| lex.flags & REG_NFA)
{
ep->re_flags |= REG_NFA;
if ((lex.err = libuxre_regnfacomp(ep, tp, &lex)) != 0)
goto out;
}
if ((lex.flags & REG_NFA) == 0)
{
ep->re_flags |= REG_DFA;
if ((lex.err = libuxre_regdfacomp(ep, tp, &lex)) != 0)
{
if (ep->re_flags & REG_NFA)
libuxre_regdelnfa(ep->re_nfa);
}
}
out:;
if (lex.err != 0 && lex.col != 0)
(void)libuxre_lc_collate(lex.col);
if (tp != 0)
libuxre_regdeltree(tp, lex.err);
return lex.err;
}