76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
|
|
FUNCTION
|
|
<<wcstombs>>---minimal wide char string to multibyte string converter
|
|
|
|
INDEX
|
|
wcstombs
|
|
|
|
SYNOPSIS
|
|
#include <stdlib.h>
|
|
size_t wcstombs(char *restrict <[s]>, const wchar_t *restrict <[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 multi-byte 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>> > 0.
|
|
|
|
PORTABILITY
|
|
<<wcstombs>> is required in the ANSI C standard. However, the precise
|
|
effects vary with the locale.
|
|
|
|
<<wcstombs>> requires no supporting OS subroutines.
|
|
*/
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
#include <newlib.h>
|
|
#include <stdlib.h>
|
|
#include <wchar.h>
|
|
|
|
size_t
|
|
wcstombs (char *__restrict s,
|
|
const wchar_t *__restrict pwcs,
|
|
size_t n)
|
|
{
|
|
#ifdef _MB_CAPABLE
|
|
mbstate_t state;
|
|
state.__count = 0;
|
|
|
|
return _wcstombs_r (_REENT, s, pwcs, n, &state);
|
|
#else /* not _MB_CAPABLE */
|
|
int count = 0;
|
|
|
|
if (n != 0) {
|
|
do {
|
|
if ((*s++ = (char) *pwcs++) == 0)
|
|
break;
|
|
count++;
|
|
} while (--n != 0);
|
|
}
|
|
|
|
return count;
|
|
#endif /* not _MB_CAPABLE */
|
|
}
|
|
|
|
#endif /* !_REENT_ONLY */
|