CMakeLua/Source/CursesDialog/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, juergen.pfeifer@gmx.net                       *
  11 *                                                                          *
  12 ***************************************************************************/
  13
  14 #include "form.priv.h"
  15
  16 MODULE_ID("$Id: fty_regex.c,v 1.2 2002/06/18 21:19:38 king 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   ap=0; /* Silence unused parameter warning.  */
 151   return 0;
 152 #endif
 153 }
 154
 155 /*---------------------------------------------------------------------------
 156 |   Facility      :  libnform
 157 |   Function      :  static void *Copy_RegularExpression_Type(
 158 |                                      const void * argp)
 159 |
 160 |   Description   :  Copy structure for regex type argument.
 161 |
 162 |   Return Values :  Pointer to argument structure or NULL on error.
 163 +--------------------------------------------------------------------------*/
 164 static void *Copy_RegularExpression_Type(const void * argp)
 165 {
 166 #if (HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS)
 167   const RegExp_Arg *ap = (const RegExp_Arg *)argp;
 168   const RegExp_Arg *result = (const RegExp_Arg *)0;
 169
 170   if (ap)
 171     {
 172       *(ap->refCount) += 1;
 173       result = ap;
 174     }
 175   return (void *)result;
 176 #else
 177   argp=0; /* Silence unused parameter warning.  */
 178   return 0;
 179 #endif
 180 }
 181
 182 /*---------------------------------------------------------------------------
 183 |   Facility      :  libnform
 184 |   Function      :  static void Free_RegularExpression_Type(void * argp)
 185 |
 186 |   Description   :  Free structure for regex type argument.
 187 |
 188 |   Return Values :  -
 189 +--------------------------------------------------------------------------*/
 190 static void Free_RegularExpression_Type(void * argp)
 191 {
 192 #if HAVE_REGEX_H_FUNCS | HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 193   RegExp_Arg *ap = (RegExp_Arg *)argp;
 194   if (ap)
 195     {
 196       if (--(*(ap->refCount)) == 0)
 197         {
 198 #if HAVE_REGEX_H_FUNCS
 199           if (ap->pRegExp)
 200             {
 201               free(ap->refCount);
 202               regfree(ap->pRegExp);
 203             }
 204 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 205           if (ap->compiled_expression)
 206             {
 207               free(ap->refCount);
 208               free(ap->compiled_expression);
 209             }
 210 #endif
 211           free(ap);
 212         }
 213     }
 214 #else
 215   argp=0; /* Silence unused parameter warning.  */
 216 #endif
 217 }
 218
 219 /*---------------------------------------------------------------------------
 220 |   Facility      :  libnform
 221 |   Function      :  static bool Check_RegularExpression_Field(
 222 |                                      FIELD * field,
 223 |                                      const void  * argp)
 224 |
 225 |   Description   :  Validate buffer content to be a valid regular expression
 226 |
 227 |   Return Values :  TRUE  - field is valid
 228 |                    FALSE - field is invalid
 229 +--------------------------------------------------------------------------*/
 230 static bool Check_RegularExpression_Field(FIELD * field, const void  * argp)
 231 {
 232   bool match = FALSE;
 233 #if HAVE_REGEX_H_FUNCS
 234   const RegExp_Arg *ap = (const RegExp_Arg*)argp;
 235   if (ap && ap->pRegExp)
 236     match = (regexec(ap->pRegExp,field_buffer(field,0),0,NULL,0) ? FALSE:TRUE);
 237 #elif HAVE_REGEXP_H_FUNCS | HAVE_REGEXPR_H_FUNCS
 238   RegExp_Arg *ap = (RegExp_Arg *)argp;
 239   if (ap && ap->compiled_expression)
 240     match = (step(field_buffer(field,0),ap->compiled_expression) ? TRUE:FALSE);
 241 #else
 242   argp=0;  /* Silence unused parameter warning.  */
 243   field=0; /* Silence unused parameter warning.  */
 244 #endif
 245   return match;
 246 }
 247
 248 static FIELDTYPE typeREGEXP = {
 249   _HAS_ARGS | _RESIDENT,
 250   1,                           /* this is mutable, so we can't be const */
 251   (FIELDTYPE *)0,
 252   (FIELDTYPE *)0,
 253   Make_RegularExpression_Type,
 254   Copy_RegularExpression_Type,
 255   Free_RegularExpression_Type,
 256   Check_RegularExpression_Field,
 257   NULL,
 258   NULL,
 259   NULL
 260 };
 261
 262 FIELDTYPE* TYPE_REGEXP = &typeREGEXP;
 263
 264 /* fty_regex.c ends here */