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/***
*mbstowcs.c - Convert multibyte char string to wide char string.
*
* Copyright (c) 1990-1993, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Convert a multibyte char string into the equivalent wide char string.
*
*Revision History:
* 08-24-90 KRS Module created.
* 03-20-91 KRS Ported from 16-bit tree.
* 10-16-91 ETC Locale support under _INTL switch.
* 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
* 02-09-93 CFW Always stuff WC 0 at end of output string of room (non _INTL).
* 04-06-93 SKS Replace _CRTAPI* with _cdecl
* 05-03-93 CFW Return pointer == NULL, return size, plus massive cleanup.
* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
* 09-27-93 CFW Avoid cast bug.
* 10-26-93 CFW Test for invalid MB chars using global preset flag.
* 01-14-94 SRW if _NTSUBSET_ defined call Rtl functions
* 07-06-94 SRW Call mblen instead of _mbstrlen for input to Rtl function
* 07-07-94 MMS/IJH Undo previous change, Call _mbstrlen
*
*******************************************************************************/
#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>
/***
*size_t mbstowcs() - Convert multibyte char string to wide char string.
*
*Purpose:
* Convert a multi-byte char string into the equivalent wide char string,
* 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 *pwcs = pointer to destination wide character string buffer
* const char *s = pointer to source multibyte character string
* size_t n = maximum number of wide characters to store
*
*Exit:
* If s != NULL, returns: number of words modified (<=n)
* (size_t)-1 (if invalid mbcs)
*
*Exceptions:
* Returns (size_t)-1 if s is NULL or invalid mbcs character encountered
*
*******************************************************************************/
#ifdef MTHREAD
size_t _CRTAPI1 mbstowcs
(
wchar_t *pwcs,
const char *s,
size_t n
)
{
size_t retval;
_mlock (_LC_CTYPE_LOCK);
retval = _mbstowcs_lk(pwcs, s, n);
_munlock (_LC_CTYPE_LOCK);
return retval;
}
#endif /* MTHREAD */
#ifdef MTHREAD
size_t _CRTAPI1 _mbstowcs_lk
#else
size_t _CRTAPI1 mbstowcs
#endif
(
wchar_t *pwcs,
const char *s,
size_t n
)
{
int retval = 0;
size_t count = 0;
if (pwcs && n == 0)
return (size_t) 0;
assert(s != NULL);
/* if destination string exists, fill it in */
if (pwcs)
{
#if defined(_INTL) && !defined(_NTSUBSET_)
if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE &&
_lc_codepage == _CLOCALECP)
{
#endif /* _INTL */
#ifdef _NTSUBSET_
{
NTSTATUS Status;
int size;
size = _mbstrlen(s);
Status = RtlMultiByteToUnicodeN(pwcs, n * sizeof( *pwcs ), (PULONG)&size, s, size+1 );
if (!NT_SUCCESS(Status))
{
errno = EILSEQ;
size = -1;
} else {
size = size / sizeof( *pwcs );
if (pwcs[size-1] == L'\0') {
size -= 1;
}
}
return size;
}
#else
/* C locale: easy and fast */
while (count < n)
{
*pwcs = (wchar_t) ((unsigned char)s[count]);
if (!s[count])
return count;
count++;
pwcs++;
}
#endif
return count;
#if defined(_INTL) && !defined(_NTSUBSET_)
} else {
/* Assume that usually the buffer is large enough */
if ((count=MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
s, -1, pwcs, n)) != 0)
return count - 1;
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
{
errno = EILSEQ;
return (size_t)-1;
}
/* buffer not large enough, must do char by char */
while (count < n)
{
if ((retval = MultiByteToWideChar (_lc_codepage, MB_PRECOMPOSED,
s, MB_CUR_MAX, pwcs, 1)) == 0)
{
errno = EILSEQ;
return (size_t)-1;
}
if (!*s)
return count;
if (isleadbyte((unsigned char)*s))
s++;
s++;
count++;
pwcs++;
}
return count;
}
#endif /* _INTL */
}
else { /* pwcs == NULL, get size only, s must be NUL-terminated */
#if defined(_INTL) && !defined(_NTSUBSET_)
if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE &&
_lc_codepage == _CLOCALECP)
#endif /* _INTL */
return strlen(s);
#if defined(_INTL) && !defined(_NTSUBSET_)
else {
if ((count=MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
s, -1, NULL, 0)) == 0)
{
errno = EILSEQ;
return (size_t)-1;
}
return count - 1;
}
#endif /* _INTL */
}
}
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