contrib/ncurses/form/fty_num.c

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  28
  29 /***************************************************************************
  30 *                                                                          *
  31 *  Author : Juergen Pfeifer                                                *
  32 *                                                                          *
  33 ***************************************************************************/
  34
  35 #include "form.priv.h"
  36
  37 MODULE_ID("$Id: fty_num.c,v 1.29 2012/02/23 10:02:15 tom Exp $")
  38
  39 #if HAVE_LOCALE_H
  40 #include <locale.h>
  41 #endif
  42
  43 #if HAVE_LOCALE_H
  44 #define isDecimalPoint(c) ((c) == ((L && L->decimal_point) ? *(L->decimal_point) : '.'))
  45 #else
  46 #define isDecimalPoint(c) ((c) == '.')
  47 #endif
  48
  49 #if USE_WIDEC_SUPPORT
  50 #define isDigit(c) (iswdigit((wint_t)(c)) || isdigit(UChar(c)))
  51 #else
  52 #define isDigit(c) isdigit(UChar(c))
  53 #endif
  54
  55 #define thisARG numericARG
  56
  57 typedef struct
  58   {
  59     int precision;
  60     double low;
  61     double high;
  62     struct lconv *L;
  63   }
  64 thisARG;
  65
  66 typedef struct
  67   {
  68     int precision;
  69     double low;
  70     double high;
  71   }
  72 thisPARM;
  73
  74 /*---------------------------------------------------------------------------
  75 |   Facility      :  libnform
  76 |   Function      :  static void *Generic_This_Type(void * arg)
  77 |
  78 |   Description   :  Allocate structure for numeric type argument.
  79 |
  80 |   Return Values :  Pointer to argument structure or NULL on error
  81 +--------------------------------------------------------------------------*/
  82 static void *
  83 Generic_This_Type(void *arg)
  84 {
  85   thisARG *argn = (thisARG *) 0;
  86   thisPARM *args = (thisPARM *) arg;
  87
  88   if (args)
  89     {
  90       argn = typeMalloc(thisARG, 1);
  91
  92       if (argn)
  93         {
  94           T((T_CREATE("thisARG %p"), (void *)argn));
  95           argn->precision = args->precision;
  96           argn->low = args->low;
  97           argn->high = args->high;
  98
  99 #if HAVE_LOCALE_H
 100           argn->L = localeconv();
 101 #else
 102           argn->L = NULL;
 103 #endif
 104         }
 105     }
 106   return (void *)argn;
 107 }
 108
 109 /*---------------------------------------------------------------------------
 110 |   Facility      :  libnform
 111 |   Function      :  static void *Make_This_Type(va_list * ap)
 112 |
 113 |   Description   :  Allocate structure for numeric type argument.
 114 |
 115 |   Return Values :  Pointer to argument structure or NULL on error
 116 +--------------------------------------------------------------------------*/
 117 static void *
 118 Make_This_Type(va_list *ap)
 119 {
 120   thisPARM arg;
 121
 122   arg.precision = va_arg(*ap, int);
 123   arg.low = va_arg(*ap, double);
 124   arg.high = va_arg(*ap, double);
 125
 126   return Generic_This_Type((void *)&arg);
 127 }
 128
 129 /*---------------------------------------------------------------------------
 130 |   Facility      :  libnform
 131 |   Function      :  static void *Copy_This_Type(const void * argp)
 132 |
 133 |   Description   :  Copy structure for numeric type argument.
 134 |
 135 |   Return Values :  Pointer to argument structure or NULL on error.
 136 +--------------------------------------------------------------------------*/
 137 static void *
 138 Copy_This_Type(const void *argp)
 139 {
 140   const thisARG *ap = (const thisARG *)argp;
 141   thisARG *result = (thisARG *) 0;
 142
 143   if (argp)
 144     {
 145       result = typeMalloc(thisARG, 1);
 146       if (result)
 147         {
 148           T((T_CREATE("thisARG %p"), (void *)result));
 149           *result = *ap;
 150         }
 151     }
 152   return (void *)result;
 153 }
 154
 155 /*---------------------------------------------------------------------------
 156 |   Facility      :  libnform
 157 |   Function      :  static void Free_This_Type(void * argp)
 158 |
 159 |   Description   :  Free structure for numeric type argument.
 160 |
 161 |   Return Values :  -
 162 +--------------------------------------------------------------------------*/
 163 static void
 164 Free_This_Type(void *argp)
 165 {
 166   if (argp)
 167     free(argp);
 168 }
 169
 170 /*---------------------------------------------------------------------------
 171 |   Facility      :  libnform
 172 |   Function      :  static bool Check_This_Field(FIELD * field,
 173 |                                                 const void * argp)
 174 |
 175 |   Description   :  Validate buffer content to be a valid numeric value
 176 |
 177 |   Return Values :  TRUE  - field is valid
 178 |                    FALSE - field is invalid
 179 +--------------------------------------------------------------------------*/
 180 static bool
 181 Check_This_Field(FIELD *field, const void *argp)
 182 {
 183   const thisARG *argn = (const thisARG *)argp;
 184   double low = argn->low;
 185   double high = argn->high;
 186   int prec = argn->precision;
 187   unsigned char *bp = (unsigned char *)field_buffer(field, 0);
 188   char *s = (char *)bp;
 189   double val = 0.0;
 190   struct lconv *L = argn->L;
 191   char buf[64];
 192   bool result = FALSE;
 193
 194   while (*bp && *bp == ' ')
 195     bp++;
 196   if (*bp)
 197     {
 198       if (*bp == '-' || *bp == '+')
 199         bp++;
 200 #if USE_WIDEC_SUPPORT
 201       if (*bp)
 202         {
 203           bool blank = FALSE;
 204           int state = 0;
 205           int len;
 206           int n;
 207           wchar_t *list = _nc_Widen_String((char *)bp, &len);
 208
 209           if (list != 0)
 210             {
 211               result = TRUE;
 212               for (n = 0; n < len; ++n)
 213                 {
 214                   if (blank)
 215                     {
 216                       if (list[n] != ' ')
 217                         {
 218                           result = FALSE;
 219                           break;
 220                         }
 221                     }
 222                   else if (list[n] == ' ')
 223                     {
 224                       blank = TRUE;
 225                     }
 226                   else if (isDecimalPoint(list[n]))
 227                     {
 228                       if (++state > 1)
 229                         {
 230                           result = FALSE;
 231                           break;
 232                         }
 233                     }
 234                   else if (!isDigit(list[n]))
 235                     {
 236                       result = FALSE;
 237                       break;
 238                     }
 239                 }
 240               free(list);
 241             }
 242         }
 243 #else
 244       while (*bp)
 245         {
 246           if (!isdigit(UChar(*bp)))
 247             break;
 248           bp++;
 249         }
 250       if (isDecimalPoint(*bp))
 251         {
 252           bp++;
 253           while (*bp)
 254             {
 255               if (!isdigit(UChar(*bp)))
 256                 break;
 257               bp++;
 258             }
 259         }
 260       while (*bp && *bp == ' ')
 261         bp++;
 262       result = (*bp == '\0');
 263 #endif
 264       if (result)
 265         {
 266           val = atof(s);
 267           if (low < high)
 268             {
 269               if (val < low || val > high)
 270                 result = FALSE;
 271             }
 272           if (result)
 273             {
 274               _nc_SPRINTF(buf, _nc_SLIMIT(sizeof(buf))
 275                           "%.*f", (prec > 0 ? prec : 0), val);
 276               set_field_buffer(field, 0, buf);
 277             }
 278         }
 279     }
 280   return (result);
 281 }
 282
 283 /*---------------------------------------------------------------------------
 284 |   Facility      :  libnform
 285 |   Function      :  static bool Check_This_Character(
 286 |                                      int c,
 287 |                                      const void * argp)
 288 |
 289 |   Description   :  Check a character for the numeric type.
 290 |
 291 |   Return Values :  TRUE  - character is valid
 292 |                    FALSE - character is invalid
 293 +--------------------------------------------------------------------------*/
 294 static bool
 295 Check_This_Character(int c, const void *argp)
 296 {
 297   const thisARG *argn = (const thisARG *)argp;
 298   struct lconv *L = argn->L;
 299
 300   return ((isDigit(c) ||
 301            c == '+' ||
 302            c == '-' ||
 303            isDecimalPoint(c))
 304           ? TRUE
 305           : FALSE);
 306 }
 307
 308 static FIELDTYPE typeTHIS =
 309 {
 310   _HAS_ARGS | _RESIDENT,
 311   1,                            /* this is mutable, so we can't be const */
 312   (FIELDTYPE *)0,
 313   (FIELDTYPE *)0,
 314   Make_This_Type,
 315   Copy_This_Type,
 316   Free_This_Type,
 317   INIT_FT_FUNC(Check_This_Field),
 318   INIT_FT_FUNC(Check_This_Character),
 319   INIT_FT_FUNC(NULL),
 320   INIT_FT_FUNC(NULL),
 321 #if NCURSES_INTEROP_FUNCS
 322   Generic_This_Type
 323 #endif
 324 };
 325
 326 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_NUMERIC = &typeTHIS;
 327
 328 #if NCURSES_INTEROP_FUNCS
 329 /* The next routines are to simplify the use of ncurses from
 330    programming languages with restictions on interop with C level
 331    constructs (e.g. variable access or va_list + ellipsis constructs)
 332 */
 333 NCURSES_EXPORT(FIELDTYPE *)
 334 _nc_TYPE_NUMERIC(void)
 335 {
 336   return TYPE_NUMERIC;
 337 }
 338 #endif
 339
 340 /* fty_num.c ends here */