compiler/clib/strcspn.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function strcspn().
   6 */
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11 #include <string.h>
  12
  13         size_t strcspn (
  14
  15 /*  SYNOPSIS */
  16         const char * str,
  17         const char * reject)
  18
  19 /*  FUNCTION
  20         Calculates the length of the initial segment of str which consists
  21         entirely of characters not in reject.
  22
  23     INPUTS
  24         str - The string to check.
  25         reject - Characters which must not be in str.
  26
  27     RESULT
  28         Length of the initial segment of str which doesn't contain any
  29         characters from reject.
  30
  31     NOTES
  32
  33     EXAMPLE
  34         char buffer[64];
  35
  36         strcpy (buffer, "Hello ");
  37
  38         // Returns 5
  39         strcspn (buffer, " ");
  40
  41         // Returns 0
  42         strcspn (buffer, "H");
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50 ******************************************************************************/
  51 {
  52     size_t n = 0; /* Must set this to zero */
  53
  54     while (*str && !strchr (reject, *str))
  55     {
  56         str ++;
  57         n ++;
  58     }
  59
  60     return n;
  61 } /* strcspn */