compiler/clib/mblen.c

   1 /*
   2     Copyright © 2004-2012, 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
  14 #include <string.h>
  15 #include <stdlib.h>
  16
  17         int mblen(
  18
  19 /*  SYNOPSIS */
  20         const char *s,
  21         size_t n)
  22
  23 /*  FUNCTION
  24         This function returns the number of bytes of the next multi-byte
  25         character.
  26
  27     INPUTS
  28         s: string pointer to look at next multi-byte character.
  29         n: The maximum number of bytes to look at.
  30
  31     RESULT
  32         if s is not NULL will return the length in bytes of the next
  33         multi-byte character in s; 0 is return when it is a NULL
  34         byte character; -1 if it is not a valid multi-byte character.
  35         If s is NULL zero or non-zero is returned when multi-byte encodings
  36         resp. don't or do have state-dependent encodings.
  37
  38     NOTES
  39         arosc.library currently only implements the "C" locale
  40         This means that either 0 or 1 is returned when s is not NULL.
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50 ******************************************************************************/
  51 {
  52     if (s == NULL)
  53         /* No state-dependent encondings */
  54         return 0;
  55
  56     if (n == 0 || *s == '\0')
  57         return 0;
  58
  59     if (isascii(*s))
  60         return 1;
  61     else
  62         return -1;
  63 }
  64