forked from KolibriOS/kolibrios
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
|
|
FUNCTION
|
|
<<mbtowc>>---minimal multibyte to wide char converter
|
|
|
|
INDEX
|
|
mbtowc
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <stdlib.h>
|
|
int mbtowc(wchar_t *<[pwc]>, const char *<[s]>, size_t <[n]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <stdlib.h>
|
|
int mbtowc(<[pwc]>, <[s]>, <[n]>)
|
|
wchar_t *<[pwc]>;
|
|
const char *<[s]>;
|
|
size_t <[n]>;
|
|
|
|
DESCRIPTION
|
|
When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
|
|
implementation of <<mbtowc>>. In this case,
|
|
only ``multi-byte character sequences'' recognized are single bytes,
|
|
and they are ``converted'' to themselves.
|
|
Each call to <<mbtowc>> copies one character from <<*<[s]>>> to
|
|
<<*<[pwc]>>>, unless <[s]> is a null pointer. The argument n
|
|
is ignored.
|
|
|
|
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 <<mbtowc>> returns <<0>> if
|
|
<[s]> is <<NULL>> or is the empty string;
|
|
it returns <<1>> if not _MB_CAPABLE or
|
|
the character is a single-byte character; it returns <<-1>>
|
|
if n is <<0>> or the multi-byte character is invalid;
|
|
otherwise it returns the number of bytes in the multibyte character.
|
|
If the return value is -1, no changes are made to the <<pwc>>
|
|
output string. If the input is the empty string, a wchar_t nul
|
|
is placed in the output string and 0 is returned. If the input
|
|
has a length of 0, no changes are made to the <<pwc>> output string.
|
|
|
|
PORTABILITY
|
|
<<mbtowc>> is required in the ANSI C standard. However, the precise
|
|
effects vary with the locale.
|
|
|
|
<<mbtowc>> requires no supporting OS subroutines.
|
|
*/
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
#include <newlib.h>
|
|
#include <stdlib.h>
|
|
#include <wchar.h>
|
|
#include "local.h"
|
|
|
|
int
|
|
_DEFUN (mbtowc, (pwc, s, n),
|
|
wchar_t *pwc _AND
|
|
const char *s _AND
|
|
size_t n)
|
|
{
|
|
#ifdef _MB_CAPABLE
|
|
int retval = 0;
|
|
mbstate_t *ps;
|
|
|
|
_REENT_CHECK_MISC(_REENT);
|
|
ps = &(_REENT_MBTOWC_STATE(_REENT));
|
|
|
|
retval = __mbtowc (_REENT, pwc, s, n, __locale_charset (), ps);
|
|
|
|
if (retval < 0)
|
|
{
|
|
ps->__count = 0;
|
|
return -1;
|
|
}
|
|
return retval;
|
|
#else /* not _MB_CAPABLE */
|
|
if (s == NULL)
|
|
return 0;
|
|
if (n == 0)
|
|
return -1;
|
|
if (pwc)
|
|
*pwc = (wchar_t) *s;
|
|
return (*s != '\0');
|
|
#endif /* not _MB_CAPABLE */
|
|
}
|
|
|
|
#endif /* !_REENT_ONLY */
|
|
|
|
|
|
|
|
|