MBLEN(3)

NAME
2.26 `mblen'--minimal multibyte length function

SYNOPSIS
     #include <stdlib.h>
     int mblen(const char *S, size_t N);

DESCRIPTION
When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming implementation of `mblen'. In this case, the only "multi-byte character sequences" recognized are single bytes, and thus `1' is returned unless S is the null pointer or has a length of 0 or is the empty string.
   When _MB_CAPABLE is defined, this routine calls `_mbtowc_r' to perform the conversion, passing a state variable to allow state dependent decoding. The result is based on the locale setting which may be restricted to a defined set of locales.

RETURNS
This implementation of `mblen' returns `0' if S is `NULL' or the empty string; it returns `1' if not _MB_CAPABLE or the character is a single-byte character; it returns `-1' if the multi-byte character is invalid; otherwise it returns the number of bytes in the multibyte character.

PORTABILITY
`mblen' is required in the ANSI C standard. However, the precise effects vary with the locale.
   `mblen' requires no supporting OS subroutines.

SEE ALSO
mblen is part of the library. The full documentation for is maintained as a Texinfo manual. If info and are properly installed at your site, the command

    info

will give you access to the complete manual.