1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Eclipse Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.eclipse.org/org/documents/epl-v10.html * 11* (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23/* 24 * re_comp implementation 25 */ 26 27#include <ast.h> 28#include <re_comp.h> 29#include <regex.h> 30 31#undef error 32#undef valid 33 34static struct 35{ 36 char error[64]; 37 regex_t re; 38 int valid; 39} state; 40 41char* 42re_comp(const char* pattern) 43{ 44 register int r; 45 46 if (!pattern || !*pattern) 47 { 48 if (state.valid) 49 return 0; 50 r = REG_BADPAT; 51 } 52 else 53 { 54 if (state.valid) 55 { 56 state.valid = 0; 57 regfree(&state.re); 58 } 59 if (!(r = regcomp(&state.re, pattern, REG_LENIENT|REG_NOSUB|REG_NULL))) 60 { 61 state.valid = 1; 62 return 0; 63 } 64 } 65 regerror(r, &state.re, state.error, sizeof(state.error)); 66 return state.error; 67} 68 69int 70re_exec(const char* subject) 71{ 72 if (state.valid && subject) 73 switch (regexec(&state.re, subject, 0, NiL, 0)) 74 { 75 case 0: 76 return 1; 77 case REG_NOMATCH: 78 return 0; 79 } 80 return -1; 81} 82