compiler/stdc/strnlen.c

   1 /*
   2     Copyright © 2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function strnlen().
   6 */
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11 #include <string.h>
  12
  13         size_t strnlen (
  14
  15 /*  SYNOPSIS */
  16         const char * ptr, size_t n)
  17
  18 /*  FUNCTION
  19         Calculate the length of a string (without the terminating 0 byte).
  20
  21     INPUTS
  22         ptr - The string to get its length for
  23         n - The max length
  24
  25     RESULT
  26         The length of the string.
  27
  28     NOTES
  29
  30     EXAMPLE
  31
  32     BUGS
  33
  34     SEE ALSO
  35
  36     INTERNALS
  37
  38 ******************************************************************************/
  39 {
  40     const char * start = ptr;
  41
  42     while (*ptr && n)
  43     {
  44         ptr ++;
  45         n--;
  46     }
  47
  48     return (((long)ptr) - ((long)start));
  49 } /* strnlen */
  50