isctype.cpp File Reference

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

Include dependency graph for isctype.cpp:

Go to the source code of this file.

Functions
int __cdecl	_isctype_l (int const c, int const mask, _locale_t const locale)
int __cdecl	_isctype (int const c, int const mask)

Function Documentation

_isctype()

int __cdecl _isctype	(	int const	c,
		int const	mask
	)

Definition at line 108 of file isctype.cpp.

{
    if (__acrt_locale_changed())
    {
        return _isctype_l(c, mask, nullptr);
    }
 
    return __acrt_locale_get_ctype_array_value(__acrt_initial_locale_data._public._locale_pctype, c, mask);
}

_isctype_l()

int __cdecl _isctype_l	(	int const	c,
		int const	mask,
		_locale_t const	locale
	)

Definition at line 62 of file isctype.cpp.

{
    _LocaleUpdate locale_update(locale);
 
    if (c >= -1 && c <= 255)
    {
        // Direct access to _locale_pctype is allowed due to bounds check.
        return locale_update.GetLocaleT()->locinfo->_public._locale_pctype[c] & mask;
    }
 
    size_t const buffer_count{3};
 
    int  buffer_length;
    char buffer[buffer_count];
    if (_isleadbyte_fast_internal(c >> 8 & 0xff, locale_update.GetLocaleT()))
    {
        buffer[0] = (c >> 8 & 0xff); // Put lead-byte at start of the string
        buffer[1] = static_cast<char>(c);
        buffer[2] = '\0';
        buffer_length = 2;
    }
    else
    {
        buffer[0] = static_cast<char>(c);
        buffer[1] = '\0';
        buffer_length = 1;
    }
 
 
    unsigned short character_type[buffer_count]{};
    if (__acrt_GetStringTypeA(
            locale_update.GetLocaleT(),
            CT_CTYPE1,
            buffer,
            buffer_length,
            character_type,
            locale_update.GetLocaleT()->locinfo->_public._locale_lc_codepage,
            TRUE
        ) == 0)
    {
        return 0;
    }
 
    return static_cast<int>(character_type[0] & mask);
}

Referenced by _isctype().