contrib/ncurses-5.4/form/fty_ipv4.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 : Per Foreby, perf@efd.lth.se                                    *
  11 *                                                                          *
  12 ***************************************************************************/
  13
  14 #include "form.priv.h"
  15
  16 MODULE_ID("$Id: fty_ipv4.c,v 1.4 2000/12/09 23:46:12 tom Exp $")
  17
  18 /*---------------------------------------------------------------------------
  19 |   Facility      :  libnform
  20 |   Function      :  static bool Check_IPV4_Field(
  21 |                                      FIELD * field,
  22 |                                      const void * argp)
  23 |
  24 |   Description   :  Validate buffer content to be a valid IP number (Ver. 4)
  25 |
  26 |   Return Values :  TRUE  - field is valid
  27 |                    FALSE - field is invalid
  28 +--------------------------------------------------------------------------*/
  29 static bool Check_IPV4_Field(FIELD * field, const void * argp GCC_UNUSED)
  30 {
  31   char *bp = field_buffer(field,0);
  32   int num = 0, len;
  33   unsigned int d1, d2, d3, d4;
  34
  35   if(isdigit((unsigned char)*bp)) /* Must start with digit */
  36     {
  37       num = sscanf(bp, "%u.%u.%u.%u%n", &d1, &d2, &d3, &d4, &len);
  38       if (num == 4)
  39         {
  40           bp += len;            /* Make bp point to what sscanf() left */
  41           while (*bp && isspace((unsigned char)*bp))
  42             bp++;               /* Allow trailing whitespace */
  43         }
  44     }
  45   return ((num != 4 || *bp || d1 > 255 || d2 > 255
  46                            || d3 > 255 || d4 > 255) ? FALSE : TRUE);
  47 }
  48
  49 /*---------------------------------------------------------------------------
  50 |   Facility      :  libnform
  51 |   Function      :  static bool Check_IPV4_Character(
  52 |                                      int c,
  53 |                                      const void *argp )
  54 |
  55 |   Description   :  Check a character for unsigned type or period.
  56 |
  57 |   Return Values :  TRUE  - character is valid
  58 |                    FALSE - character is invalid
  59 +--------------------------------------------------------------------------*/
  60 static bool Check_IPV4_Character(int c, const void * argp GCC_UNUSED)
  61 {
  62   return ((isdigit(c) || (c=='.')) ? TRUE : FALSE);
  63 }
  64
  65 static FIELDTYPE typeIPV4 = {
  66   _RESIDENT,
  67   1,                           /* this is mutable, so we can't be const */
  68   (FIELDTYPE *)0,
  69   (FIELDTYPE *)0,
  70   NULL,
  71   NULL,
  72   NULL,
  73   Check_IPV4_Field,
  74   Check_IPV4_Character,
  75   NULL,
  76   NULL
  77 };
  78
  79 NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_IPV4 = &typeIPV4;
  80
  81 /* fty_ipv4.c ends here */