payloads/libpayload/curses/form/fty_regex.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2009,2010 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 1.24 2010/01/23 21:14:37 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               preg->refCount = typeMalloc(unsigned long, 1);
 127
 128               *(preg->refCount) = 1;
 129             }
 130           else
 131             {
 132               if (preg->pRegExp)
 133                 free(preg->pRegExp);
 134               free(preg);
 135               preg = (RegExp_Arg *)0;
 136             }
 137         }
 138     }
 139   return ((void *)preg);
 140 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 141   char *rx = (char *)arg;
 142   RegExp_Arg *pArg = (RegExp_Arg *)0;
 143
 144   if (rx)
 145     {
 146       pArg = typeMalloc(RegExp_Arg, 1);
 147
 148       if (pArg)
 149         {
 150           int blen = RX_INCREMENT;
 151
 152           T((T_CREATE("RegExp_Arg %p"), pArg));
 153           pArg->compiled_expression = NULL;
 154           pArg->refCount = typeMalloc(unsigned long, 1);
 155
 156           *(pArg->refCount) = 1;
 157
 158           do
 159             {
 160               char *buf = typeMalloc(char, blen);
 161
 162               if (buf)
 163                 {
 164 #if HAVE_REGEXP_H_FUNCS
 165                   char *last_pos = compile(rx, buf, &buf[blen], '\0');
 166
 167 #else /* HAVE_REGEXPR_H_FUNCS */
 168                   char *last_pos = compile(rx, buf, &buf[blen]);
 169 #endif
 170                   if (reg_errno)
 171                     {
 172                       free(buf);
 173                       if (reg_errno == 50)
 174                         blen += RX_INCREMENT;
 175                       else
 176                         {
 177                           free(pArg);
 178                           pArg = NULL;
 179                           break;
 180                         }
 181                     }
 182                   else
 183                     {
 184                       pArg->compiled_expression = buf;
 185                       break;
 186                     }
 187                 }
 188             }
 189           while (blen <= MAX_RX_LEN);
 190         }
 191       if (pArg && !pArg->compiled_expression)
 192         {
 193           free(pArg);
 194           pArg = NULL;
 195         }
 196     }
 197   return (void *)pArg;
 198 #else
 199   return 0;
 200 #endif
 201 }
 202
 203 /*---------------------------------------------------------------------------
 204 |   Facility      :  libnform
 205 |   Function      :  static void *Make_RegularExpression_Type(va_list * ap)
 206 |
 207 |   Description   :  Allocate structure for regex type argument.
 208 |
 209 |   Return Values :  Pointer to argument structure or NULL on error
 210 +--------------------------------------------------------------------------*/
 211 static void *
 212 Make_RegularExpression_Type(va_list *ap)
 213 {
 214   char *rx = va_arg(*ap, char *);
 215
 216   return Generic_RegularExpression_Type((void *)rx);
 217 }
 218
 219 /*---------------------------------------------------------------------------
 220 |   Facility      :  libnform
 221 |   Function      :  static void *Copy_RegularExpression_Type(
 222 |                                      const void * argp)
 223 |
 224 |   Description   :  Copy structure for regex type argument.
 225 |
 226 |   Return Values :  Pointer to argument structure or NULL on error.
 227 +--------------------------------------------------------------------------*/
 228 static void *
 229 Copy_RegularExpression_Type(const void *argp MAYBE_UNUSED)
 230 {
 231 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
 232   const RegExp_Arg *ap = (const RegExp_Arg *)argp;
 233   const RegExp_Arg *result = (const RegExp_Arg *)0;
 234
 235   if (ap)
 236     {
 237       *(ap->refCount) += 1;
 238       result = ap;
 239     }
 240   return (void *)result;
 241 #else
 242   return 0;
 243 #endif
 244 }
 245
 246 /*---------------------------------------------------------------------------
 247 |   Facility      :  libnform
 248 |   Function      :  static void Free_RegularExpression_Type(void * argp)
 249 |
 250 |   Description   :  Free structure for regex type argument.
 251 |
 252 |   Return Values :  -
 253 +--------------------------------------------------------------------------*/
 254 static void
 255 Free_RegularExpression_Type(void *argp MAYBE_UNUSED)
 256 {
 257 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 258   RegExp_Arg *ap = (RegExp_Arg *)argp;
 259
 260   if (ap)
 261     {
 262       if (--(*(ap->refCount)) == 0)
 263         {
 264 #if HAVE_REGEX_H_FUNCS
 265           if (ap->pRegExp)
 266             {
 267               free(ap->refCount);
 268               regfree(ap->pRegExp);
 269             }
 270 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 271           if (ap->compiled_expression)
 272             {
 273               free(ap->refCount);
 274               free(ap->compiled_expression);
 275             }
 276 #endif
 277           free(ap);
 278         }
 279     }
 280 #endif
 281 }
 282
 283 /*---------------------------------------------------------------------------
 284 |   Facility      :  libnform
 285 |   Function      :  static bool Check_RegularExpression_Field(
 286 |                                      FIELD * field,
 287 |                                      const void  * argp)
 288 |
 289 |   Description   :  Validate buffer content to be a valid regular expression
 290 |
 291 |   Return Values :  TRUE  - field is valid
 292 |                    FALSE - field is invalid
 293 +--------------------------------------------------------------------------*/
 294 static bool
 295 Check_RegularExpression_Field(FIELD *field MAYBE_UNUSED,
 296                               const void *argp MAYBE_UNUSED)
 297 {
 298   bool match = FALSE;
 299
 300 #if HAVE_REGEX_H_FUNCS
 301   const RegExp_Arg *ap = (const RegExp_Arg *)argp;
 302
 303   if (ap && ap->pRegExp)
 304     match = (regexec(ap->pRegExp, field_buffer(field, 0), 0, NULL, 0)
 305              ? FALSE
 306              : TRUE);
 307 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 308   RegExp_Arg *ap = (RegExp_Arg *)argp;
 309
 310   if (ap && ap->compiled_expression)
 311     match = (step(field_buffer(field, 0), ap->compiled_expression)
 312              ? TRUE
 313              : FALSE);
 314 #endif
 315   return match;
 316 }
 317
 318 static FIELDTYPE typeREGEXP =
 319 {
 320   _HAS_ARGS | _RESIDENT,
 321   1,                            /* this is mutable, so we can't be const */
 322   (FIELDTYPE *)0,
 323   (FIELDTYPE *)0,
 324   Make_RegularExpression_Type,
 325   Copy_RegularExpression_Type,
 326   Free_RegularExpression_Type,
 327   INIT_FT_FUNC(Check_RegularExpression_Field),
 328   INIT_FT_FUNC(NULL),
 329   INIT_FT_FUNC(NULL),
 330   INIT_FT_FUNC(NULL),
 331 #if NCURSES_INTEROP_FUNCS
 332   Generic_RegularExpression_Type
 333 #endif
 334 };
 335
 336 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
 337
 338 #if NCURSES_INTEROP_FUNCS
 339 /* The next routines are to simplify the use of ncurses from
 340    programming languages with restictions on interop with C level
 341    constructs (e.g. variable access or va_list + ellipsis constructs)
 342 */
 343 NCURSES_EXPORT(FIELDTYPE *)
 344 _nc_TYPE_REGEXP(void)
 345 {
 346   return TYPE_REGEXP;
 347 }
 348 #endif
 349
 350 /* fty_regex.c ends here */