1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 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 34 static struct 35 { 36 char error[64]; 37 regex_t re; 38 int valid; 39 } state; 40 41 char* 42 re_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 69 int 70 re_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