wcstombs
[minimal wide char string
to multibyte string converter]
SYNOPSIS
#include<stdlib.h>
int wcstombs(const char *s,
wchar_t *pwc, size_t n);
DESCRIPTION
When MB_CAPABLE
is not defined, this is a minimal ANSI-conforming implementation of wcstombs.
In this case, all wide-characters are expected to represent single bytes
and so are converted simply by casting to char.
When MB_CAPABLE is defined, this routine calls _wcstombs_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 wcstombs
returns 0 if s is NULL or is the empty string; it returns -1
if MB_CAPABLE
and one of the wide-char characters does not represent a valid multibyte
character; otherwise it returns the minimum of n
or the number of bytes that are transferred to s,
not including the nul
terminator.
If the return value is -1, the state of the pwc string is indeterminate. If the input has a length of 0, the output string will be modified to contain a wchar_t nul terminator if n is greater than 0.
COMPLIANCE
wcstombs
is required in the ANSI C standard. However, the precise effects vary with
the locale.
wcstombs requires no supporting OS subroutines.