contrib/ncurses-5.4/form/fty_regex.c

   1
   2 /*
   3  * THIS CODE IS SPECIFICALLY EXEMPTED FROM THE NCURSES PACKAGE COPYRIGHT.
   4  * You may freely copy it for use as a template for your own field types.
   5  * If you develop a field type that might be of general use, please send
   6  * it back to the ncurses maintainers for inclusion in the next version.
   7  */
   8 /***************************************************************************
   9 *                                                                          *
  10 *  Author : Juergen Pfeifer                                                *
  11 *                                                                          *
  12 ***************************************************************************/
  13
  14 #include "form.priv.h"
  15
  16 MODULE_ID("$Id: fty_regex.c,v 1.17 2003/10/25 14:54:48 tom Exp $")
  17
  18 #if HAVE_REGEX_H_FUNCS  /* We prefer POSIX regex */
  19 #include <regex.h>
  20
  21 typedef struct
  22 {
  23   regex_t *pRegExp;
  24   unsigned long *refCount;
  25 } RegExp_Arg;
  26
  27 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
  28 #undef RETURN
  29 static int reg_errno;
  30
  31 static char *RegEx_Init(char *instring)
  32 {
  33         reg_errno = 0;
  34         return instring;
  35 }
  36
  37 static char *RegEx_Error(int code)
  38 {
  39         reg_errno = code;
  40         return 0;
  41 }
  42
  43 #define INIT            register char *sp = RegEx_Init(instring);
  44 #define GETC()          (*sp++)
  45 #define PEEKC()         (*sp)
  46 #define UNGETC(c)       (--sp)
  47 #define RETURN(c)       return(c)
  48 #define ERROR(c)        return RegEx_Error(c)
  49
  50 #if HAVE_REGEXP_H_FUNCS
  51 #include <regexp.h>
  52 #else
  53 #include <regexpr.h>
  54 #endif
  55
  56 typedef struct
  57 {
  58   char *compiled_expression;
  59   unsigned long *refCount;
  60 } RegExp_Arg;
  61
  62 /* Maximum Length we allow for a compiled regular expression */
  63 #define MAX_RX_LEN   (2048)
  64 #define RX_INCREMENT (256)
  65
  66 #endif
  67
  68 /*---------------------------------------------------------------------------
  69 |   Facility      :  libnform
  70 |   Function      :  static void *Make_RegularExpression_Type(va_list * ap)
  71 |
  72 |   Description   :  Allocate structure for regex type argument.
  73 |
  74 |   Return Values :  Pointer to argument structure or NULL on error
  75 +--------------------------------------------------------------------------*/
  76 static void *Make_RegularExpression_Type(va_list * ap)
  77 {
  78 #if HAVE_REGEX_H_FUNCS
  79   char *rx = va_arg(*ap,char *);
  80   RegExp_Arg *preg;
  81
  82   preg = (RegExp_Arg*)malloc(sizeof(RegExp_Arg));
  83   if (preg)
  84     {
  85       if (((preg->pRegExp = (regex_t*)malloc(sizeof(regex_t))) != (regex_t*)0)
  86        && !regcomp(preg->pRegExp,rx,
  87                    (REG_EXTENDED | REG_NOSUB | REG_NEWLINE) ))
  88         {
  89           preg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
  90           *(preg->refCount) = 1;
  91         }
  92       else
  93         {
  94           if (preg->pRegExp)
  95             free(preg->pRegExp);
  96           free(preg);
  97           preg = (RegExp_Arg*)0;
  98         }
  99     }
 100   return((void *)preg);
 101 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 102   char *rx = va_arg(*ap,char *);
 103   RegExp_Arg *pArg;
 104
 105   pArg = (RegExp_Arg *)malloc(sizeof(RegExp_Arg));
 106
 107   if (pArg)
 108     {
 109       int blen = RX_INCREMENT;
 110       pArg->compiled_expression = NULL;
 111       pArg->refCount = (unsigned long *)malloc(sizeof(unsigned long));
 112       *(pArg->refCount) = 1;
 113
 114       do {
 115         char *buf = (char *)malloc(blen);
 116         if (buf)
 117           {
 118 #if HAVE_REGEXP_H_FUNCS
 119             char *last_pos = compile (rx, buf, &buf[blen], '\0');
 120 #else /* HAVE_REGEXPR_H_FUNCS */
 121             char *last_pos = compile (rx, buf, &buf[blen]);
 122 #endif
 123             if (reg_errno)
 124               {
 125                 free(buf);
 126                 if (reg_errno==50)
 127                   blen += RX_INCREMENT;
 128                 else
 129                   {
 130                     free(pArg);
 131                     pArg = NULL;
 132                     break;
 133                   }
 134               }
 135             else
 136               {
 137                 pArg->compiled_expression = buf;
 138                 break;
 139               }
 140           }
 141       } while( blen <= MAX_RX_LEN );
 142     }
 143   if (pArg && !pArg->compiled_expression)
 144     {
 145       free(pArg);
 146       pArg = NULL;
 147     }
 148   return (void *)pArg;
 149 #else
 150   return 0;
 151 #endif
 152 }
 153
 154 /*---------------------------------------------------------------------------
 155 |   Facility      :  libnform
 156 |   Function      :  static void *Copy_RegularExpression_Type(
 157 |                                      const void * argp)
 158 |
 159 |   Description   :  Copy structure for regex type argument.
 160 |
 161 |   Return Values :  Pointer to argument structure or NULL on error.
 162 +--------------------------------------------------------------------------*/
 163 static void *Copy_RegularExpression_Type(const void * argp)
 164 {
 165 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
 166   const RegExp_Arg *ap = (const RegExp_Arg *)argp;
 167   const RegExp_Arg *result = (const RegExp_Arg *)0;
 168
 169   if (ap)
 170     {
 171       *(ap->refCount) += 1;
 172       result = ap;
 173     }
 174   return (void *)result;
 175 #else
 176   return 0;
 177 #endif
 178 }
 179
 180 /*---------------------------------------------------------------------------
 181 |   Facility      :  libnform
 182 |   Function      :  static void Free_RegularExpression_Type(void * argp)
 183 |
 184 |   Description   :  Free structure for regex type argument.
 185 |
 186 |   Return Values :  -
 187 +--------------------------------------------------------------------------*/
 188 static void Free_RegularExpression_Type(void * argp)
 189 {
 190 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 191   RegExp_Arg *ap = (RegExp_Arg *)argp;
 192   if (ap)
 193     {
 194       if (--(*(ap->refCount)) == 0)
 195         {
 196 #if HAVE_REGEX_H_FUNCS
 197           if (ap->pRegExp)
 198             {
 199               free(ap->refCount);
 200               regfree(ap->pRegExp);
 201             }
 202 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 203           if (ap->compiled_expression)
 204             {
 205               free(ap->refCount);
 206               free(ap->compiled_expression);
 207             }
 208 #endif
 209           free(ap);
 210         }
 211     }
 212 #endif
 213 }
 214
 215 /*---------------------------------------------------------------------------
 216 |   Facility      :  libnform
 217 |   Function      :  static bool Check_RegularExpression_Field(
 218 |                                      FIELD * field,
 219 |                                      const void  * argp)
 220 |
 221 |   Description   :  Validate buffer content to be a valid regular expression
 222 |
 223 |   Return Values :  TRUE  - field is valid
 224 |                    FALSE - field is invalid
 225 +--------------------------------------------------------------------------*/
 226 static bool Check_RegularExpression_Field(FIELD * field, const void  * argp)
 227 {
 228   bool match = FALSE;
 229 #if HAVE_REGEX_H_FUNCS
 230   const RegExp_Arg *ap = (const RegExp_Arg*)argp;
 231   if (ap && ap->pRegExp)
 232     match = (regexec(ap->pRegExp,field_buffer(field,0),0,NULL,0) ? FALSE:TRUE);
 233 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 234   RegExp_Arg *ap = (RegExp_Arg *)argp;
 235   if (ap && ap->compiled_expression)
 236     match = (step(field_buffer(field,0),ap->compiled_expression) ? TRUE:FALSE);
 237 #endif
 238   return match;
 239 }
 240
 241 static FIELDTYPE typeREGEXP = {
 242   _HAS_ARGS | _RESIDENT,
 243   1,                           /* this is mutable, so we can't be const */
 244   (FIELDTYPE *)0,
 245   (FIELDTYPE *)0,
 246   Make_RegularExpression_Type,
 247   Copy_RegularExpression_Type,
 248   Free_RegularExpression_Type,
 249   Check_RegularExpression_Field,
 250   NULL,
 251   NULL,
 252   NULL
 253 };
 254
 255 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_REGEXP = &typeREGEXP;
 256
 257 /* fty_regex.c ends here */