1 /**************************************************************************** 2 * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /*************************************************************************** 30 * * 31 * Author : Juergen Pfeifer * 32 * * 33 ***************************************************************************/ 34 35 #include "form.priv.h" 36 37 MODULE_ID("$Id: fty_regex.c,v 1.21 2007/10/13 19:33:50 tom Exp $") 38 39 #if HAVE_REGEX_H_FUNCS /* We prefer POSIX regex */ 40 #include <regex.h> 41 42 typedef struct 43 { 44 regex_t *pRegExp; 45 unsigned long *refCount; 46 } 47 RegExp_Arg; 48 49 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 50 #undef RETURN 51 static int reg_errno; 52 53 static char * 54 RegEx_Init(char *instring) 55 { 56 reg_errno = 0; 57 return instring; 58 } 59 60 static char * 61 RegEx_Error(int code) 62 { 63 reg_errno = code; 64 return 0; 65 } 66 67 #define INIT register char *sp = RegEx_Init(instring); 68 #define GETC() (*sp++) 69 #define PEEKC() (*sp) 70 #define UNGETC(c) (--sp) 71 #define RETURN(c) return(c) 72 #define ERROR(c) return RegEx_Error(c) 73 74 #if HAVE_REGEXP_H_FUNCS 75 #include <regexp.h> 76 #else 77 #include <regexpr.h> 78 #endif 79 80 typedef struct 81 { 82 char *compiled_expression; 83 unsigned long *refCount; 84 } 85 RegExp_Arg; 86 87 /* Maximum Length we allow for a compiled regular expression */ 88 #define MAX_RX_LEN (2048) 89 #define RX_INCREMENT (256) 90 91 #endif 92 93 /*--------------------------------------------------------------------------- 94 | Facility : libnform 95 | Function : static void *Make_RegularExpression_Type(va_list * ap) 96 | 97 | Description : Allocate structure for regex type argument. 98 | 99 | Return Values : Pointer to argument structure or NULL on error 100 +--------------------------------------------------------------------------*/ 101 static void * 102 Make_RegularExpression_Type(va_list *ap) 103 { 104 #if HAVE_REGEX_H_FUNCS 105 char *rx = va_arg(*ap, char *); 106 RegExp_Arg *preg; 107 108 preg = typeMalloc(RegExp_Arg, 1); 109 110 if (preg) 111 { 112 T((T_CREATE("RegExp_Arg %p"), preg)); 113 if (((preg->pRegExp = typeMalloc(regex_t, 1)) != 0) 114 && !regcomp(preg->pRegExp, rx, 115 (REG_EXTENDED | REG_NOSUB | REG_NEWLINE))) 116 { 117 T((T_CREATE("regex_t %p"), preg->pRegExp)); 118 preg->refCount = typeMalloc(unsigned long, 1); 119 120 *(preg->refCount) = 1; 121 } 122 else 123 { 124 if (preg->pRegExp) 125 free(preg->pRegExp); 126 free(preg); 127 preg = (RegExp_Arg *)0; 128 } 129 } 130 return ((void *)preg); 131 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 132 char *rx = va_arg(*ap, char *); 133 RegExp_Arg *pArg; 134 135 pArg = typeMalloc(RegExp_Arg, 1); 136 137 if (pArg) 138 { 139 int blen = RX_INCREMENT; 140 141 T((T_CREATE("RegExp_Arg %p"), pArg)); 142 pArg->compiled_expression = NULL; 143 pArg->refCount = typeMalloc(unsigned long, 1); 144 145 *(pArg->refCount) = 1; 146 147 do 148 { 149 char *buf = typeMalloc(char, blen); 150 151 if (buf) 152 { 153 #if HAVE_REGEXP_H_FUNCS 154 char *last_pos = compile(rx, buf, &buf[blen], '\0'); 155 156 #else /* HAVE_REGEXPR_H_FUNCS */ 157 char *last_pos = compile(rx, buf, &buf[blen]); 158 #endif 159 if (reg_errno) 160 { 161 free(buf); 162 if (reg_errno == 50) 163 blen += RX_INCREMENT; 164 else 165 { 166 free(pArg); 167 pArg = NULL; 168 break; 169 } 170 } 171 else 172 { 173 pArg->compiled_expression = buf; 174 break; 175 } 176 } 177 } 178 while (blen <= MAX_RX_LEN); 179 } 180 if (pArg && !pArg->compiled_expression) 181 { 182 free(pArg); 183 pArg = NULL; 184 } 185 return (void *)pArg; 186 #else 187 return 0; 188 #endif 189 } 190 191 /*--------------------------------------------------------------------------- 192 | Facility : libnform 193 | Function : static void *Copy_RegularExpression_Type( 194 | const void * argp) 195 | 196 | Description : Copy structure for regex type argument. 197 | 198 | Return Values : Pointer to argument structure or NULL on error. 199 +--------------------------------------------------------------------------*/ 200 static void * 201 Copy_RegularExpression_Type(const void *argp) 202 { 203 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS) 204 const RegExp_Arg *ap = (const RegExp_Arg *)argp; 205 const RegExp_Arg *result = (const RegExp_Arg *)0; 206 207 if (ap) 208 { 209 *(ap->refCount) += 1; 210 result = ap; 211 } 212 return (void *)result; 213 #else 214 return 0; 215 #endif 216 } 217 218 /*--------------------------------------------------------------------------- 219 | Facility : libnform 220 | Function : static void Free_RegularExpression_Type(void * argp) 221 | 222 | Description : Free structure for regex type argument. 223 | 224 | Return Values : - 225 +--------------------------------------------------------------------------*/ 226 static void 227 Free_RegularExpression_Type(void *argp) 228 { 229 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 230 RegExp_Arg *ap = (RegExp_Arg *)argp; 231 232 if (ap) 233 { 234 if (--(*(ap->refCount)) == 0) 235 { 236 #if HAVE_REGEX_H_FUNCS 237 if (ap->pRegExp) 238 { 239 free(ap->refCount); 240 regfree(ap->pRegExp); 241 } 242 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 243 if (ap->compiled_expression) 244 { 245 free(ap->refCount); 246 free(ap->compiled_expression); 247 } 248 #endif 249 free(ap); 250 } 251 } 252 #endif 253 } 254 255 /*--------------------------------------------------------------------------- 256 | Facility : libnform 257 | Function : static bool Check_RegularExpression_Field( 258 | FIELD * field, 259 | const void * argp) 260 | 261 | Description : Validate buffer content to be a valid regular expression 262 | 263 | Return Values : TRUE - field is valid 264 | FALSE - field is invalid 265 +--------------------------------------------------------------------------*/ 266 static bool 267 Check_RegularExpression_Field(FIELD *field, const void *argp) 268 { 269 bool match = FALSE; 270 271 #if HAVE_REGEX_H_FUNCS 272 const RegExp_Arg *ap = (const RegExp_Arg *)argp; 273 274 if (ap && ap->pRegExp) 275 match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0) 276 ? FALSE 277 : TRUE); 278 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 279 RegExp_Arg *ap = (RegExp_Arg *)argp; 280 281 if (ap && ap->compiled_expression) 282 match = (step(field_buffer(field, 0), ap->compiled_expression) 283 ? TRUE 284 : FALSE); 285 #endif 286 return match; 287 } 288 289 static FIELDTYPE typeREGEXP = 290 { 291 _HAS_ARGS | _RESIDENT, 292 1, /* this is mutable, so we can't be const */ 293 (FIELDTYPE *)0, 294 (FIELDTYPE *)0, 295 Make_RegularExpression_Type, 296 Copy_RegularExpression_Type, 297 Free_RegularExpression_Type, 298 Check_RegularExpression_Field, 299 NULL, 300 NULL, 301 NULL 302 }; 303 304 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP; 305 306 /* fty_regex.c ends here */ 307