1 /**************************************************************************** 2 * Copyright (c) 1998-2010,2012 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 1.25 2012/10/27 20:12:53 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 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 94 # define MAYBE_UNUSED 95 #else 96 # define MAYBE_UNUSED GCC_UNUSED 97 #endif 98 99 /*--------------------------------------------------------------------------- 100 | Facility : libnform 101 | Function : static void *Generic_RegularExpression_Type(void * arg) 102 | 103 | Description : Allocate structure for regex type argument. 104 | 105 | Return Values : Pointer to argument structure or NULL on error 106 +--------------------------------------------------------------------------*/ 107 static void * 108 Generic_RegularExpression_Type(void *arg MAYBE_UNUSED) 109 { 110 #if HAVE_REGEX_H_FUNCS 111 char *rx = (char *)arg; 112 RegExp_Arg *preg = (RegExp_Arg *)0; 113 114 if (rx) 115 { 116 preg = typeMalloc(RegExp_Arg, 1); 117 118 if (preg) 119 { 120 T((T_CREATE("RegExp_Arg %p"), (void *)preg)); 121 if (((preg->pRegExp = typeMalloc(regex_t, 1)) != 0) 122 && !regcomp(preg->pRegExp, rx, 123 (REG_EXTENDED | REG_NOSUB | REG_NEWLINE))) 124 { 125 T((T_CREATE("regex_t %p"), (void *)preg->pRegExp)); 126 if ((preg->refCount = typeMalloc(unsigned long, 1)) != 0) 127 *(preg->refCount) = 1; 128 } 129 else 130 { 131 if (preg->pRegExp) 132 free(preg->pRegExp); 133 free(preg); 134 preg = (RegExp_Arg *)0; 135 } 136 } 137 } 138 return ((void *)preg); 139 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 140 char *rx = (char *)arg; 141 RegExp_Arg *pArg = (RegExp_Arg *)0; 142 143 if (rx) 144 { 145 pArg = typeMalloc(RegExp_Arg, 1); 146 147 if (pArg) 148 { 149 int blen = RX_INCREMENT; 150 151 T((T_CREATE("RegExp_Arg %p"), pArg)); 152 pArg->compiled_expression = NULL; 153 if ((pArg->refCount = typeMalloc(unsigned long, 1)) != 0) 154 *(pArg->refCount) = 1; 155 156 do 157 { 158 char *buf = typeMalloc(char, blen); 159 160 if (buf) 161 { 162 #if HAVE_REGEXP_H_FUNCS 163 char *last_pos = compile(rx, buf, &buf[blen], '\0'); 164 165 #else /* HAVE_REGEXPR_H_FUNCS */ 166 char *last_pos = compile(rx, buf, &buf[blen]); 167 #endif 168 if (reg_errno) 169 { 170 free(buf); 171 if (reg_errno == 50) 172 blen += RX_INCREMENT; 173 else 174 { 175 free(pArg); 176 pArg = NULL; 177 break; 178 } 179 } 180 else 181 { 182 pArg->compiled_expression = buf; 183 break; 184 } 185 } 186 } 187 while (blen <= MAX_RX_LEN); 188 } 189 if (pArg && !pArg->compiled_expression) 190 { 191 free(pArg); 192 pArg = NULL; 193 } 194 } 195 return (void *)pArg; 196 #else 197 return 0; 198 #endif 199 } 200 201 /*--------------------------------------------------------------------------- 202 | Facility : libnform 203 | Function : static void *Make_RegularExpression_Type(va_list * ap) 204 | 205 | Description : Allocate structure for regex type argument. 206 | 207 | Return Values : Pointer to argument structure or NULL on error 208 +--------------------------------------------------------------------------*/ 209 static void * 210 Make_RegularExpression_Type(va_list *ap) 211 { 212 char *rx = va_arg(*ap, char *); 213 214 return Generic_RegularExpression_Type((void *)rx); 215 } 216 217 /*--------------------------------------------------------------------------- 218 | Facility : libnform 219 | Function : static void *Copy_RegularExpression_Type( 220 | const void * argp) 221 | 222 | Description : Copy structure for regex type argument. 223 | 224 | Return Values : Pointer to argument structure or NULL on error. 225 +--------------------------------------------------------------------------*/ 226 static void * 227 Copy_RegularExpression_Type(const void *argp MAYBE_UNUSED) 228 { 229 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS) 230 const RegExp_Arg *ap = (const RegExp_Arg *)argp; 231 const RegExp_Arg *result = (const RegExp_Arg *)0; 232 233 if (ap) 234 { 235 *(ap->refCount) += 1; 236 result = ap; 237 } 238 return (void *)result; 239 #else 240 return 0; 241 #endif 242 } 243 244 /*--------------------------------------------------------------------------- 245 | Facility : libnform 246 | Function : static void Free_RegularExpression_Type(void * argp) 247 | 248 | Description : Free structure for regex type argument. 249 | 250 | Return Values : - 251 +--------------------------------------------------------------------------*/ 252 static void 253 Free_RegularExpression_Type(void *argp MAYBE_UNUSED) 254 { 255 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 256 RegExp_Arg *ap = (RegExp_Arg *)argp; 257 258 if (ap) 259 { 260 if (--(*(ap->refCount)) == 0) 261 { 262 #if HAVE_REGEX_H_FUNCS 263 if (ap->pRegExp) 264 { 265 free(ap->refCount); 266 regfree(ap->pRegExp); 267 } 268 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 269 if (ap->compiled_expression) 270 { 271 free(ap->refCount); 272 free(ap->compiled_expression); 273 } 274 #endif 275 free(ap); 276 } 277 } 278 #endif 279 } 280 281 /*--------------------------------------------------------------------------- 282 | Facility : libnform 283 | Function : static bool Check_RegularExpression_Field( 284 | FIELD * field, 285 | const void * argp) 286 | 287 | Description : Validate buffer content to be a valid regular expression 288 | 289 | Return Values : TRUE - field is valid 290 | FALSE - field is invalid 291 +--------------------------------------------------------------------------*/ 292 static bool 293 Check_RegularExpression_Field(FIELD *field MAYBE_UNUSED, 294 const void *argp MAYBE_UNUSED) 295 { 296 bool match = FALSE; 297 298 #if HAVE_REGEX_H_FUNCS 299 const RegExp_Arg *ap = (const RegExp_Arg *)argp; 300 301 if (ap && ap->pRegExp) 302 match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0) 303 ? FALSE 304 : TRUE); 305 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS 306 RegExp_Arg *ap = (RegExp_Arg *)argp; 307 308 if (ap && ap->compiled_expression) 309 match = (step(field_buffer(field, 0), ap->compiled_expression) 310 ? TRUE 311 : FALSE); 312 #endif 313 return match; 314 } 315 316 static FIELDTYPE typeREGEXP = 317 { 318 _HAS_ARGS | _RESIDENT, 319 1, /* this is mutable, so we can't be const */ 320 (FIELDTYPE *)0, 321 (FIELDTYPE *)0, 322 Make_RegularExpression_Type, 323 Copy_RegularExpression_Type, 324 Free_RegularExpression_Type, 325 INIT_FT_FUNC(Check_RegularExpression_Field), 326 INIT_FT_FUNC(NULL), 327 INIT_FT_FUNC(NULL), 328 INIT_FT_FUNC(NULL), 329 #if NCURSES_INTEROP_FUNCS 330 Generic_RegularExpression_Type 331 #endif 332 }; 333 334 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP; 335 336 #if NCURSES_INTEROP_FUNCS 337 /* The next routines are to simplify the use of ncurses from 338 programming languages with restictions on interop with C level 339 constructs (e.g. variable access or va_list + ellipsis constructs) 340 */ 341 NCURSES_EXPORT(FIELDTYPE *) 342 _nc_TYPE_REGEXP(void) 343 { 344 return TYPE_REGEXP; 345 } 346 #endif 347 348 /* fty_regex.c ends here */ 349