1 files changed, 93 insertions, 0 deletions
diff --git a/src/string/ntapi_tt_string_null_offset.c b/src/string/ntapi_tt_string_null_offset.c
new file mode 100644
index 0000000..3565acb
--- /dev/null
+++ b/src/string/ntapi_tt_string_null_offset.c
@@ -0,0 +1,93 @@
+/********************************************************/
+/*  ntapi: Native API core library                      */
+/*  Copyright (C) 2013,2014,2015  Z. Gilboa             */
+/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
+/********************************************************/
+
+#include <psxtypes/psxtypes.h>
+#include <ntapi/nt_string.h>
+#include "ntapi_impl.h"
+
+size_t __cdecl __ntapi_tt_string_null_offset_multibyte(
+	__in	const char *	str)
+{
+	const char *		cap;
+	const uintptr_t *	ptr;
+
+	#define HIGH_BIT_TEST	(uintptr_t)0x0101010101010101
+	#define	AND_BITS	(uintptr_t)0x8080808080808080
+
+	cap = str;
+	while ((uintptr_t)cap % sizeof(uintptr_t)) {
+		if (!(*cap))
+			return cap - str;
+		cap++;
+	}
+
+	ptr = (uintptr_t *)cap;
+	while (!((*ptr - HIGH_BIT_TEST) & ~(*ptr) & AND_BITS))
+		ptr++;
+
+	cap = (const char *)ptr;
+	while (*cap)
+		cap++;
+
+	return cap - str;
+}
+
+
+size_t __cdecl __ntapi_tt_string_null_offset_short(
+	__in	const int16_t *	str)
+{
+	const int16_t *	cap;
+
+	cap = str;
+	while (*cap)
+		cap++;
+
+	return (size_t)cap - (size_t)str;
+}
+
+
+size_t __cdecl __ntapi_tt_string_null_offset_dword(
+	__in	const int32_t *	str)
+{
+	const int32_t *	cap;
+
+	cap = str;
+	while (*cap)
+		cap++;
+
+	return (size_t)cap - (size_t)str;
+}
+
+size_t __cdecl __ntapi_tt_string_null_offset_qword(
+	__in	const int64_t *	str)
+{
+	const int64_t *	cap;
+
+	cap = str;
+	while (*cap)
+		cap++;
+
+	return (size_t)cap - (size_t)str;
+}
+
+size_t __cdecl __ntapi_tt_string_null_offset_ptrsize(
+	__in	const intptr_t *str)
+{
+	const intptr_t * cap;
+
+	cap = str;
+	while (*cap)
+		cap++;
+
+	return (size_t)cap - (size_t)str;
+}
+
+size_t __cdecl __ntapi_wcslen(const wchar16_t * str)
+{
+	size_t len;
+	len = __ntapi_tt_string_null_offset_short((const int16_t *)str);
+	return len / 2;
+}