compiler/stdc/mblen.c

   1 /*
   2     Copyright © 2004-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function mblen().
   6 */
   7
   8 #include <aros/debug.h>
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <stdlib.h>
  14
  15         int mblen(
  16
  17 /*  SYNOPSIS */
  18         const char *s,
  19         size_t n)
  20
  21 /*  FUNCTION
  22         This function returns the number of bytes of the next multi-byte
  23         character.
  24
  25     INPUTS
  26         s: string pointer to look at next multi-byte character.
  27         n: The maximum number of bytes to look at.
  28
  29     RESULT
  30         if s is not NULL will return the length in bytes of the next
  31         multi-byte character in s; 0 is return when it is a NULL
  32         byte character; -1 if it is not a valid multi-byte character.
  33         If s is NULL zero or non-zero is returned when multi-byte encodings
  34         resp. don't or do have state-dependent encodings.
  35
  36     NOTES
  37         stdc.library currently only implements the "C" locale
  38         This means that either 0 or 1 is returned when s is not NULL.
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45
  46     INTERNALS
  47
  48 ******************************************************************************/
  49 {
  50     if (s == NULL)
  51         /* No state-dependent encondings */
  52         return 0;
  53
  54     if (n == 0 || *s == '\0')
  55         return 0;
  56
  57     if (isascii(*s))
  58         return 1;
  59     else
  60         return -1;
  61 }
  62