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/***
*mbtowc.c - Convert multibyte char to wide char.
*
* Copyright (c) 1990-1993, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Convert a multibyte character into the equivalent wide character.
*
*Revision History:
* 03-19-90 KRS Module created.
* 12-20-90 KRS Put some intl stuff here for now...
* 03-18-91 KRS Fixed bogus cast involving wchar_t. Fix copyright.
* 03-20-91 KRS Ported from 16-bit tree.
* 07-22-91 KRS C700 3525: Check for s==0 before calling mblen.
* 07-23-91 KRS Hard-coded for "C" locale to avoid bogus interim #'s.
* 10-15-91 ETC Locale support under _INTL (finally!).
* 12-09-91 ETC Updated nlsapi; added multithread.
* 08-20-92 KRS Activated NLSAPI support.
* 08-31-92 SRW Allow INTL definition to be conditional for building ntcrt.lib
* 09-02-92 SRW Get _INTL definition via ..\crt32.def
* 04-26-93 CFW Remove unused variable.
* 05-04-93 CFW Kinder, gentler error handling.
* 06-01-93 CFW Re-write; verify valid MB char, proper error return,
* optimize, fix bugs.
* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
* 10-26-93 CFW Test for invalid MB chars using global preset flag.
* 01-14-94 SRW if _NTSUBSET_ defined call Rtl functions
*
*******************************************************************************/
#ifdef _NTSUBSET_
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#endif
#include <cruntime.h>
#include <internal.h>
#include <stdlib.h>
#include <os2dll.h>
#include <locale.h>
#include <setlocal.h>
#include <errno.h>
#include <assert.h>
/***
*int mbtowc() - Convert multibyte char to wide character.
*
*Purpose:
* Convert a multi-byte character into the equivalent wide character,
* according to the LC_CTYPE category of the current locale.
* [ANSI].
*
* NOTE: Currently, the C libraries support the "C" locale only.
* Non-C locale support now available under _INTL switch.
*Entry:
* wchar_t *pwc = pointer to destination wide character
* const char *s = pointer to multibyte character
* size_t n = maximum length of multibyte character to consider
*
*Exit:
* If s = NULL, returns 0, indicating we only use state-independent
* character encodings.
* If s != NULL, returns: 0 (if *s = null char)
* -1 (if the next n or fewer bytes not valid mbc)
* number of bytes comprising converted mbc
*
*Exceptions:
*
*******************************************************************************/
#ifdef MTHREAD
int _CRTAPI1 mbtowc
(
wchar_t *pwc,
const char *s,
size_t n
)
{
int retval;
_mlock (_LC_CTYPE_LOCK);
retval = _mbtowc_lk(pwc, s, n);
_munlock (_LC_CTYPE_LOCK);
return retval;
}
#endif /* MTHREAD */
#ifdef MTHREAD
int _CRTAPI1 _mbtowc_lk
#else
int _CRTAPI1 mbtowc
#endif
(
wchar_t *pwc,
const char *s,
size_t n
)
{
assert (MB_CUR_MAX == 1 || MB_CUR_MAX == 2);
if ( !s || n == 0 )
/* indicate do not have state-dependent encodings,
handle zero length string */
return 0;
if ( !*s )
{
/* handle NULL char */
if (pwc)
*pwc = 0;
return 0;
}
#if defined(_INTL) && !defined(_NTSUBSET_)
if ( _lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
{
#endif /* _INTL */
#ifdef _NTSUBSET_
{
NTSTATUS Status;
int size;
Status = RtlMultiByteToUnicodeN(pwc, (pwc) ? sizeof( *pwc ) : 0, (PULONG)&size, s, n );
if (!NT_SUCCESS(Status))
{
errno = EILSEQ;
size = -1;
} else
size = mblen(s, n);
return size;
}
#else
if (pwc)
*pwc = (wchar_t)(unsigned char)*s;
return sizeof(char);
#endif
#if defined(_INTL) && !defined(_NTSUBSET_)
}
if ( isleadbyte((unsigned char)*s) )
{
/* multi-byte char */
if ( MB_CUR_MAX <= 1 || (int)n < MB_CUR_MAX ||
(MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
s, MB_CUR_MAX, pwc, (pwc) ? 1 : 0) == 0) )
{
errno = EILSEQ;
return -1;
}
return MB_CUR_MAX;
}
else {
/* single byte char */
if ( MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
s, 1, pwc, (pwc) ? 1 : 0) == 0 )
{
errno = EILSEQ;
return -1;
}
return sizeof(char);
}
#endif /* _INTL */
}
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