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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 */