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/***
*wcstombs.c - Convert wide char string to multibyte char string.
*
* Copyright (c) 1990-1993, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Convert a wide char string into the equivalent multibyte char string.
*
*Revision History:
* 08-24-90 KRS Module created.
* 01-14-91 KRS Added _WINSTATIC for Windows DLL. Fix wctomb() call.
* 03-18-91 KRS Fix check for NUL.
* 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.
* 08-22-92 SRW Allow INTL definition to be conditional for building ntcrt.lib
* 09-02-92 SRW Get _INTL definition via ..\crt32.def
* 01-06-93 CFW Added (count < n) to outer loop - avoid bad wctomb calls
* 01-07-93 KRS Major code cleanup. Fix error return, comments.
* 05-03-93 CFW Return pointer == NULL, return size, plus massive cleanup.
* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
* 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 <stdlib.h>
#include <limits.h>
#include <internal.h>
#include <os2dll.h>
#include <locale.h>
#include <setlocal.h>
#include <errno.h>
#include <assert.h>
/***
*size_t wcstombs() - Convert wide char string to multibyte char string.
*
*Purpose:
* Convert a wide char string into the equivalent multibyte 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:
* char *s = pointer to destination multibyte char string
* const wchar_t *pwc = pointer to source wide character string
* size_t n = maximum number of bytes to store in s
*
*Exit:
* If s != NULL, returns (size_t)-1 (if a wchar cannot be converted)
* Otherwise: Number of bytes modified (<=n), not including
* the terminating NUL, if any.
*
*Exceptions:
* Returns (size_t)-1 if s is NULL or invalid mb character encountered.
*
*******************************************************************************/
#ifdef MTHREAD
size_t _CRTAPI1 wcstombs
(
char *s,
const wchar_t *pwcs,
size_t n
)
{
int retval;
_mlock (_LC_CTYPE_LOCK);
retval = _wcstombs_lk(s, pwcs, n);
_munlock (_LC_CTYPE_LOCK);
return retval;
}
#endif /* MTHREAD */
#ifdef MTHREAD
size_t _CRTAPI1 _wcstombs_lk
#else
size_t _CRTAPI1 wcstombs
#endif
(
char *s,
const wchar_t *pwcs,
size_t n
)
{
int i, retval;
size_t count = 0;
char buffer[MB_LEN_MAX]; /* UNDONE: what about MTHREAD ? */
BOOL defused = 0;
if (s && n == 0)
return (size_t) 0;
assert(pwcs != NULL);
/* if destination string exists, fill it in */
if (s)
{
#if defined(_INTL) && !defined(_NTSUBSET_)
if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE &&
_lc_codepage == _CLOCALECP)
{
#endif /* _INTL */
#ifdef _NTSUBSET_
{
NTSTATUS Status;
Status = RtlUnicodeToMultiByteN(s, n, (PULONG)&count, (wchar_t *)pwcs, (wcslen(pwcs)+1)*sizeof(WCHAR));
if (NT_SUCCESS(Status))
{
return count - 1; /* don't count NUL */
} else {
errno = EILSEQ;
count = (size_t)-1;
}
}
#else
/* C locale: easy and fast */
while(count < n)
{
if (*pwcs > 255) /* validate high byte */
{
errno = EILSEQ;
return (size_t)-1; /* error */
}
s[count] = (char) *pwcs;
if (*pwcs++ == L'\0')
return count;
count++;
}
#endif
return count;
#if defined(_INTL) && !defined(_NTSUBSET_)
} else {
/* Assume that usually the buffer is large enough */
if (((count=WideCharToMultiByte(_lc_codepage,
WC_COMPOSITECHECK | WC_SEPCHARS,
pwcs, -1, s, n, NULL, &defused)) != 0) && (!defused))
return count - 1; /* don't count NUL */
if (defused || GetLastError() != ERROR_INSUFFICIENT_BUFFER)
{
errno = EILSEQ;
return (size_t)-1;
}
/* buffer not large enough, must do char by char */
while (count < n)
{
if (((retval = WideCharToMultiByte (_lc_codepage, 0,
pwcs, 1, buffer, MB_CUR_MAX, NULL, &defused)) == 0) || defused)
{
errno = EILSEQ;
return (size_t)-1;
}
if (count + retval > n)
return count;
for (i = 0; i < retval; i++, count++) /* store character */
if((s[count] = buffer[i])=='\0')
return count; /* done if NUL */
pwcs++;
}
return count;
}
#endif /* _INTL */
}
else { /* s == NULL, get size only, pwcs must be NUL-terminated */
#if defined(_INTL) && !defined(_NTSUBSET_)
if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE &&
_lc_codepage == _CLOCALECP)
#endif /* _INTL */
#ifdef _NTSUBSET_
{
NTSTATUS Status;
Status = RtlUnicodeToMultiByteSize((PULONG)&count, (wchar_t *)pwcs, (wcslen(pwcs)+1)*sizeof(WCHAR));
if (NT_SUCCESS(Status))
{
return count - 1; /* don't count NUL */
} else {
errno = EILSEQ;
count = (size_t)-1;
}
}
#else
return wcslen(pwcs);
#endif
#if defined(_INTL) && !defined(_NTSUBSET_)
else {
if (((count=WideCharToMultiByte(_lc_codepage,
WC_COMPOSITECHECK | WC_SEPCHARS,
pwcs, -1, NULL, 0, NULL, &defused)) == 0) || (defused))
{
errno = EILSEQ;
return (size_t)-1;
}
return count - 1;
}
#endif /* _INTL */
}
}
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