Source/CursesDialog/form/fty_int.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_int.c,v 1.2 2002-06-18 21:19:38 king Exp $")
  17
  18 typedef struct {
  19   int precision;
  20   long low;
  21   long high;
  22 } integerARG;
  23
  24 /*---------------------------------------------------------------------------
  25 |   Facility      :  libnform
  26 |   Function      :  static void *Make_Integer_Type( va_list * ap )
  27 |
  28 |   Description   :  Allocate structure for integer type argument.
  29 |
  30 |   Return Values :  Pointer to argument structure or NULL on error
  31 +--------------------------------------------------------------------------*/
  32 static void *Make_Integer_Type(va_list * ap)
  33 {
  34   integerARG *argp = (integerARG *)malloc(sizeof(integerARG));
  35
  36   if (argp)
  37     {
  38       argp->precision = va_arg(*ap,int);
  39       argp->low       = va_arg(*ap,long);
  40       argp->high      = va_arg(*ap,long);
  41     }
  42   return (void *)argp;
  43 }
  44
  45 /*---------------------------------------------------------------------------
  46 |   Facility      :  libnform
  47 |   Function      :  static void *Copy_Integer_Type(const void * argp)
  48 |
  49 |   Description   :  Copy structure for integer type argument.
  50 |
  51 |   Return Values :  Pointer to argument structure or NULL on error.
  52 +--------------------------------------------------------------------------*/
  53 static void *Copy_Integer_Type(const void * argp)
  54 {
  55   const integerARG *ap = (const integerARG *)argp;
  56   integerARG *result = (integerARG *)0;
  57
  58   if (argp)
  59     {
  60       result = (integerARG *)malloc(sizeof(integerARG));
  61       if (result)
  62         *result = *ap;
  63     }
  64   return (void *)result;
  65 }
  66
  67 /*---------------------------------------------------------------------------
  68 |   Facility      :  libnform
  69 |   Function      :  static void Free_Integer_Type(void * argp)
  70 |
  71 |   Description   :  Free structure for integer type argument.
  72 |
  73 |   Return Values :  -
  74 +--------------------------------------------------------------------------*/
  75 static void Free_Integer_Type(void * argp)
  76 {
  77   if (argp)
  78     free(argp);
  79 }
  80
  81 /*---------------------------------------------------------------------------
  82 |   Facility      :  libnform
  83 |   Function      :  static bool Check_Integer_Field(
  84 |                                                    FIELD * field,
  85 |                                                    const void * argp)
  86 |
  87 |   Description   :  Validate buffer content to be a valid integer value
  88 |
  89 |   Return Values :  TRUE  - field is valid
  90 |                    FALSE - field is invalid
  91 +--------------------------------------------------------------------------*/
  92 static bool Check_Integer_Field(FIELD * field, const void * argp)
  93 {
  94   const integerARG *argi = (const integerARG *)argp;
  95   long low          = argi->low;
  96   long high         = argi->high;
  97   int prec          = argi->precision;
  98   unsigned char *bp = (unsigned char *)field_buffer(field,0);
  99   char *s           = (char *)bp;
 100   long val;
 101   char buf[100];
 102
 103   while( *bp && *bp==' ') bp++;
 104   if (*bp)
 105     {
 106       if (*bp=='-') bp++;
 107       while (*bp)
 108         {
 109           if (!isdigit(*bp)) break;
 110           bp++;
 111         }
 112       while(*bp && *bp==' ') bp++;
 113       if (*bp=='\0')
 114         {
 115           val = atol(s);
 116           if (low<high)
 117             {
 118               if (val<low || val>high) return FALSE;
 119             }
 120           sprintf(buf,"%.*ld",(prec>0?prec:0),val);
 121           set_field_buffer(field,0,buf);
 122           return TRUE;
 123         }
 124     }
 125   return FALSE;
 126 }
 127
 128 /*---------------------------------------------------------------------------
 129 |   Facility      :  libnform
 130 |   Function      :  static bool Check_Integer_Character(
 131 |                                      int c,
 132 |                                      const void * argp)
 133 |
 134 |   Description   :  Check a character for the integer type.
 135 |
 136 |   Return Values :  TRUE  - character is valid
 137 |                    FALSE - character is invalid
 138 +--------------------------------------------------------------------------*/
 139 static bool Check_Integer_Character(int c, const void * argp)
 140 {
 141   argp=0; /* Silence unused parameter warning.  */
 142   return ((isdigit(c) || (c=='-')) ? TRUE : FALSE);
 143 }
 144
 145 static FIELDTYPE typeINTEGER = {
 146   _HAS_ARGS | _RESIDENT,
 147   1,                           /* this is mutable, so we can't be const */
 148   (FIELDTYPE *)0,
 149   (FIELDTYPE *)0,
 150   Make_Integer_Type,
 151   Copy_Integer_Type,
 152   Free_Integer_Type,
 153   Check_Integer_Field,
 154   Check_Integer_Character,
 155   NULL,
 156   NULL
 157 };
 158
 159 FIELDTYPE* TYPE_INTEGER = &typeINTEGER;
 160
 161 /* fty_int.c ends here */