mirror of https://github.com/tildeclub/ex-vi.git
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* Changes by Gunnar Ritter, Freiburg i. Br., Germany, November 2002.
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*
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* Sccsid @(#)regcomp.c 1.6 (gritter) 9/22/03
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*/
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/* UNIX(R) Regular Expresssion Library
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*
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* Note: Code is released under the GNU LGPL
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*
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* Copyright (C) 2001 Caldera International, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to:
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* Free Software Foundation, Inc.
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* #include "synonyms.h" */
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#include "re.h"
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/* #pragma weak regcomp = _regcomp */
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int
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regcomp(regex_t *ep, const char *pat, int flags)
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{
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Tree *tp;
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Lex lex;
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if ((tp=libuxre_regparse(&lex, (const unsigned char *)pat, flags)) == 0)
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goto out;
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ep->re_nsub = lex.nleft;
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ep->re_flags = lex.flags & ~(REG_NOTBOL | REG_NOTEOL | REG_NONEMPTY);
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ep->re_col = lex.col;
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ep->re_mb_cur_max = lex.mb_cur_max;
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/*
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* Build the engine(s). The factors determining which are built:
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* 1. If the pattern built insists on an NFA, then only build NFA.
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* 2. If flags include REG_NOSUB or REG_ONESUB and not (1),
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* then only build DFA.
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* 3. Otherwise, build both.
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* Since libuxre_regdfacomp() modifies the tree and libuxre_regnfacomp()
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* doesn't, libuxre_regnfacomp() must be called first, if both are to
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* be called.
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*/
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if (ep->re_nsub != 0 && (flags & (REG_NOSUB | REG_ONESUB)) == 0
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|| lex.flags & REG_NFA)
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{
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ep->re_flags |= REG_NFA;
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if ((lex.err = libuxre_regnfacomp(ep, tp, &lex)) != 0)
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goto out;
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}
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if ((lex.flags & REG_NFA) == 0)
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{
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ep->re_flags |= REG_DFA;
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if ((lex.err = libuxre_regdfacomp(ep, tp, &lex)) != 0)
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{
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if (ep->re_flags & REG_NFA)
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libuxre_regdelnfa(ep->re_nfa);
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}
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}
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out:;
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if (lex.err != 0 && lex.col != 0)
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(void)libuxre_lc_collate(lex.col);
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if (tp != 0)
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libuxre_regdeltree(tp, lex.err);
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return lex.err;
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}
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