Blame src/string/ntapi_tt_string_null_offset.c

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/********************************************************/
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/*  ntapi: Native API core library                      */
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/*  Copyright (C) 2013--2017  Z. Gilboa                 */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
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/********************************************************/
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#include <psxtypes/psxtypes.h>
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#include <ntapi/nt_string.h>
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#include "ntapi_impl.h"
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size_t __cdecl __ntapi_tt_string_null_offset_multibyte(
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	__in	const char *	str)
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{
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	const char *		cap;
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	const uintptr_t *	ptr;
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	#define HIGH_BIT_TEST	(uintptr_t)0x0101010101010101
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	#define	AND_BITS	(uintptr_t)0x8080808080808080
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	cap = str;
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	while ((uintptr_t)cap % sizeof(uintptr_t)) {
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		if (!(*cap))
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			return cap - str;
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		cap++;
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	}
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	ptr = (uintptr_t *)cap;
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	while (!((*ptr - HIGH_BIT_TEST) & ~(*ptr) & AND_BITS))
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		ptr++;
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	cap = (const char *)ptr;
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	while (*cap)
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		cap++;
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	return cap - str;
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}
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size_t __cdecl __ntapi_tt_string_null_offset_short(
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	__in	const int16_t *	str)
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{
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	const int16_t *	cap;
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	cap = str;
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	while (*cap)
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		cap++;
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	return (size_t)cap - (size_t)str;
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}
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size_t __cdecl __ntapi_tt_string_null_offset_dword(
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	__in	const int32_t *	str)
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{
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	const int32_t *	cap;
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	cap = str;
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	while (*cap)
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		cap++;
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	return (size_t)cap - (size_t)str;
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}
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size_t __cdecl __ntapi_tt_string_null_offset_qword(
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	__in	const int64_t *	str)
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{
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	const int64_t *	cap;
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	cap = str;
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	while (*cap)
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		cap++;
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	return (size_t)cap - (size_t)str;
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}
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size_t __cdecl __ntapi_tt_string_null_offset_ptrsize(
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	__in	const intptr_t *str)
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{
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	const intptr_t * cap;
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	cap = str;
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	while (*cap)
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		cap++;
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	return (size_t)cap - (size_t)str;
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}
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size_t __cdecl __ntapi_tt_wcslen(const wchar16_t * str)
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{
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	size_t len;
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	len = __ntapi_tt_string_null_offset_short((const int16_t *)str);
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	return len / 2;
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}