contrib/ncurses/form/fty_ipv4.c

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  28
  29 /***************************************************************************
  30 *                                                                          *
  31 *  Author : Per Foreby, perf@efd.lth.se                                    *
  32 *                                                                          *
  33 ***************************************************************************/
  34
  35 #include "form.priv.h"
  36
  37 MODULE_ID("$Id: fty_ipv4.c,v 1.10 2009/11/07 20:17:58 tom Exp $")
  38
  39 /*---------------------------------------------------------------------------
  40 |   Facility      :  libnform
  41 |   Function      :  static bool Check_IPV4_Field(
  42 |                                      FIELD * field,
  43 |                                      const void * argp)
  44 |
  45 |   Description   :  Validate buffer content to be a valid IP number (Ver. 4)
  46 |
  47 |   Return Values :  TRUE  - field is valid
  48 |                    FALSE - field is invalid
  49 +--------------------------------------------------------------------------*/
  50 static bool
  51 Check_IPV4_Field(FIELD *field, const void *argp GCC_UNUSED)
  52 {
  53   char *bp = field_buffer(field, 0);
  54   int num = 0, len;
  55   unsigned int d1, d2, d3, d4;
  56
  57   if (isdigit(UChar(*bp)))      /* Must start with digit */
  58     {
  59       num = sscanf(bp, "%u.%u.%u.%u%n", &d1, &d2, &d3, &d4, &len);
  60       if (num == 4)
  61         {
  62           bp += len;            /* Make bp point to what sscanf() left */
  63           while (isspace(UChar(*bp)))
  64             bp++;               /* Allow trailing whitespace */
  65         }
  66     }
  67   return ((num != 4 || *bp || d1 > 255 || d2 > 255
  68            || d3 > 255 || d4 > 255) ? FALSE : TRUE);
  69 }
  70
  71 /*---------------------------------------------------------------------------
  72 |   Facility      :  libnform
  73 |   Function      :  static bool Check_IPV4_Character(
  74 |                                      int c,
  75 |                                      const void *argp )
  76 |
  77 |   Description   :  Check a character for unsigned type or period.
  78 |
  79 |   Return Values :  TRUE  - character is valid
  80 |                    FALSE - character is invalid
  81 +--------------------------------------------------------------------------*/
  82 static bool
  83 Check_IPV4_Character(int c, const void *argp GCC_UNUSED)
  84 {
  85   return ((isdigit(UChar(c)) || (c == '.')) ? TRUE : FALSE);
  86 }
  87
  88 static FIELDTYPE typeIPV4 =
  89 {
  90   _RESIDENT,
  91   1,                            /* this is mutable, so we can't be const */
  92   (FIELDTYPE *)0,
  93   (FIELDTYPE *)0,
  94   NULL,
  95   NULL,
  96   NULL,
  97   INIT_FT_FUNC(Check_IPV4_Field),
  98   INIT_FT_FUNC(Check_IPV4_Character),
  99   INIT_FT_FUNC(NULL),
 100   INIT_FT_FUNC(NULL),
 101 #if NCURSES_INTEROP_FUNCS
 102   NULL
 103 #endif
 104 };
 105
 106 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_IPV4 = &typeIPV4;
 107
 108 #if NCURSES_INTEROP_FUNCS
 109 /* The next routines are to simplify the use of ncurses from
 110    programming languages with restictions on interop with C level
 111    constructs (e.g. variable access or va_list + ellipsis constructs)
 112 */
 113 NCURSES_EXPORT(FIELDTYPE *)
 114 _nc_TYPE_IPV4(void)
 115 {
 116   return TYPE_IPV4;
 117 }
 118 #endif
 119
 120 /* fty_ipv4.c ends here */