GetStringTypeA.cpp File Reference

#include <corecrt_internal.h>
#include <locale.h>

Include dependency graph for GetStringTypeA.cpp:

Go to the source code of this file.

Functions
BOOL __cdecl	__acrt_GetStringTypeA (_locale_t const locale, DWORD const info_type, LPCSTR const string, int const string_size_in_bytes, unsigned short *const char_type, int const code_page, BOOL const error)

Function Documentation

__acrt_GetStringTypeA()

BOOL __cdecl __acrt_GetStringTypeA	(	_locale_t const	locale,
		DWORD const	info_type,
		LPCSTR const	string,
		int const	string_size_in_bytes,
		unsigned short *const	char_type,
		int const	code_page,
		BOOL const	error
	)

Definition at line 43 of file GetStringTypeA.cpp.

{
    _LocaleUpdate locale_update(locale);
 
    // Convert string and return the requested information. Note that
    // we are converting to a wide character string so there is not a
    // one-to-one correspondence between number of multibyte chars in the
    // input string and the number of wide chars in the buffer. However,
    // there had *better be* a one-to-one correspondence between the
    // number of multibyte characters and the number of WORDs in the
    // return buffer.
 
    // Use __lc_codepage for conversion if code_page not specified:
    int const actual_code_page = code_page != 0
        ? code_page
        : locale_update.GetLocaleT()->locinfo->_public._locale_lc_codepage;
 
    // Find out how big a buffer we need:
    int const required_extent = __acrt_MultiByteToWideChar(
        actual_code_page,
        error ? (MB_PRECOMPOSED | MB_ERR_INVALID_CHARS) : MB_PRECOMPOSED,
        string,
        string_size_in_bytes,
        nullptr,
        0);
 
    if (required_extent == 0)
        return FALSE;
 
    // Allocate enough space for the wide character string:
    __crt_scoped_stack_ptr<wchar_t> buffer(_malloca_crt_t(wchar_t, required_extent));
    if (buffer.get() == nullptr)
        return FALSE;
 
    memset(buffer.get(), 0, sizeof(wchar_t) * required_extent);
 
    // Do the conversion:
    int const actual_extent = __acrt_MultiByteToWideChar(
        actual_code_page,
        MB_PRECOMPOSED,
        string,
        string_size_in_bytes,
        buffer.get(),
        required_extent);
 
    if (actual_extent == 0)
        return FALSE;
 
    return GetStringTypeW(info_type, buffer.get(), actual_extent, char_type);
}

Referenced by __acrt_locale_initialize_ctype(), _isctype_l(), _wsetlocale_set_cat(), and setSBUpLow().