198 lines
6.7 KiB
C
198 lines
6.7 KiB
C
/***
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*mbstowcs.c - Convert multibyte char string to wide char string.
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*
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* Copyright (c) 1990-1993, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Convert a multibyte char string into the equivalent wide char string.
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*
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*Revision History:
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* 08-24-90 KRS Module created.
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* 03-20-91 KRS Ported from 16-bit tree.
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* 10-16-91 ETC Locale support under _INTL switch.
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* 12-09-91 ETC Updated nlsapi; added multithread.
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* 08-20-92 KRS Activated NLSAPI support.
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* 08-31-92 SRW Allow INTL definition to be conditional for building ntcrt.lib
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* 09-02-92 SRW Get _INTL definition via ..\crt32.def
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* 02-09-93 CFW Always stuff WC 0 at end of output string of room (non _INTL).
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* 04-06-93 SKS Replace _CRTAPI* with _cdecl
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* 05-03-93 CFW Return pointer == NULL, return size, plus massive cleanup.
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* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
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* 09-27-93 CFW Avoid cast bug.
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* 10-26-93 CFW Test for invalid MB chars using global preset flag.
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* 01-14-94 SRW if _NTSUBSET_ defined call Rtl functions
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* 07-06-94 SRW Call mblen instead of _mbstrlen for input to Rtl function
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* 07-07-94 MMS/IJH Undo previous change, Call _mbstrlen
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*
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*******************************************************************************/
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#ifdef _NTSUBSET_
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#endif
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#include <cruntime.h>
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#include <internal.h>
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#include <stdlib.h>
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#include <os2dll.h>
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#include <locale.h>
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#include <setlocal.h>
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#include <errno.h>
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#include <assert.h>
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/***
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*size_t mbstowcs() - Convert multibyte char string to wide char string.
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*
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*Purpose:
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* Convert a multi-byte char string into the equivalent wide char string,
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* according to the LC_CTYPE category of the current locale.
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* [ANSI].
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*
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* NOTE: Currently, the C libraries support the "C" locale only.
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* Non-C locale support now available under _INTL switch.
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*Entry:
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* wchar_t *pwcs = pointer to destination wide character string buffer
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* const char *s = pointer to source multibyte character string
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* size_t n = maximum number of wide characters to store
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*
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*Exit:
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* If s != NULL, returns: number of words modified (<=n)
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* (size_t)-1 (if invalid mbcs)
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*
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*Exceptions:
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* Returns (size_t)-1 if s is NULL or invalid mbcs character encountered
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*
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*******************************************************************************/
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#ifdef MTHREAD
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size_t _CRTAPI1 mbstowcs
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(
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wchar_t *pwcs,
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const char *s,
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size_t n
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)
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{
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size_t retval;
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_mlock (_LC_CTYPE_LOCK);
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retval = _mbstowcs_lk(pwcs, s, n);
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_munlock (_LC_CTYPE_LOCK);
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return retval;
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}
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#endif /* MTHREAD */
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#ifdef MTHREAD
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size_t _CRTAPI1 _mbstowcs_lk
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#else
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size_t _CRTAPI1 mbstowcs
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#endif
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(
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wchar_t *pwcs,
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const char *s,
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size_t n
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)
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{
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int retval = 0;
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size_t count = 0;
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if (pwcs && n == 0)
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return (size_t) 0;
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assert(s != NULL);
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/* if destination string exists, fill it in */
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if (pwcs)
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{
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#if defined(_INTL) && !defined(_NTSUBSET_)
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if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE &&
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_lc_codepage == _CLOCALECP)
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{
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#endif /* _INTL */
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#ifdef _NTSUBSET_
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{
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NTSTATUS Status;
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int size;
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size = _mbstrlen(s);
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Status = RtlMultiByteToUnicodeN(pwcs, n * sizeof( *pwcs ), (PULONG)&size, s, size+1 );
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if (!NT_SUCCESS(Status))
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{
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errno = EILSEQ;
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size = -1;
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} else {
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size = size / sizeof( *pwcs );
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if (pwcs[size-1] == L'\0') {
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size -= 1;
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}
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}
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return size;
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}
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#else
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/* C locale: easy and fast */
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while (count < n)
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{
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*pwcs = (wchar_t) ((unsigned char)s[count]);
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if (!s[count])
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return count;
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count++;
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pwcs++;
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}
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#endif
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return count;
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#if defined(_INTL) && !defined(_NTSUBSET_)
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} else {
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/* Assume that usually the buffer is large enough */
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if ((count=MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
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s, -1, pwcs, n)) != 0)
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return count - 1;
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if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
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{
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errno = EILSEQ;
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return (size_t)-1;
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}
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/* buffer not large enough, must do char by char */
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while (count < n)
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{
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if ((retval = MultiByteToWideChar (_lc_codepage, MB_PRECOMPOSED,
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s, MB_CUR_MAX, pwcs, 1)) == 0)
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{
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errno = EILSEQ;
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return (size_t)-1;
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}
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if (!*s)
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return count;
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if (isleadbyte((unsigned char)*s))
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s++;
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s++;
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count++;
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pwcs++;
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}
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return count;
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}
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#endif /* _INTL */
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}
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else { /* pwcs == NULL, get size only, s must be NUL-terminated */
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#if defined(_INTL) && !defined(_NTSUBSET_)
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if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE &&
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_lc_codepage == _CLOCALECP)
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#endif /* _INTL */
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return strlen(s);
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#if defined(_INTL) && !defined(_NTSUBSET_)
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else {
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if ((count=MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
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s, -1, NULL, 0)) == 0)
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{
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errno = EILSEQ;
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return (size_t)-1;
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}
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return count - 1;
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}
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#endif /* _INTL */
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}
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}
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