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Diffstat (limited to 'private/crt32/convert/mbstowcs.c')
| -rw-r--r-- | private/crt32/convert/mbstowcs.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/private/crt32/convert/mbstowcs.c b/private/crt32/convert/mbstowcs.c new file mode 100644 index 000000000..739b91c5e --- /dev/null +++ b/private/crt32/convert/mbstowcs.c @@ -0,0 +1,197 @@ +/*** +*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 */ + } +} |