compiler/stdc/strspn.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function strspn().
   6 */
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11 #include <string.h>
  12
  13         size_t strspn (
  14
  15 /*  SYNOPSIS */
  16         const char * str,
  17         const char * accept)
  18
  19 /*  FUNCTION
  20         Calculates the length of the initial segment of str which consists
  21         entirely of characters in accept.
  22
  23     INPUTS
  24         str - The string to check.
  25         accept - Characters which have to be in str.
  26
  27     RESULT
  28         Length of the initial segment of str which contains only
  29         characters from accept.
  30
  31     NOTES
  32
  33     EXAMPLE
  34         char buffer[64];
  35
  36         strcpy (buffer, "Hello ");
  37
  38         // Returns 5
  39         strspn (buffer, "Helo");
  40
  41         // Returns 0
  42         strspn (buffer, "xyz");
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50 ******************************************************************************/
  51 {
  52     size_t n = 0;
  53
  54     while (*str && strchr (accept, *str))
  55     {
  56         str ++;
  57         n ++;
  58     }
  59
  60     return n;
  61 } /* strspn */