--- Libc/Libc-1583.40.7/include/secure/_string.h
+++ Libc/Libc-997.90.3/include/secure/_string.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007,2017 Apple Inc. All rights reserved.
+ * Copyright (c) 2007 Apple Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  *
@@ -28,16 +28,21 @@
 #ifndef _SECURE__STRING_H_
 #define _SECURE__STRING_H_
 
+#include <Availability.h>
 #include <sys/cdefs.h>
-#include <Availability.h>
 #include <secure/_common.h>
 
 #if _USE_FORTIFY_LEVEL > 0
 
+#ifndef __has_builtin
+#define _undef__has_builtin
+#define __has_builtin(x) 0
+#endif
+
 /* <rdar://problem/12622659> */
 #if defined(__clang__) && \
-		((defined(__apple_build_version__) && __apple_build_version__ >= 4260006) || \
-		(!defined(__apple_build_version__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 3))))
+    ((defined(__apple_build_version__) && __apple_build_version__ >= 4260006) || \
+     (!defined(__apple_build_version__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 3))))
 #define __HAS_FIXED_CHK_PROTOTYPES 1
 #else
 #define __HAS_FIXED_CHK_PROTOTYPES 0
@@ -46,106 +51,91 @@
 /* memccpy, memcpy, mempcpy, memmove, memset, strcpy, strlcpy, stpcpy,
    strncpy, stpncpy, strcat, strlcat, and strncat */
 
-#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000 || __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090 || \
-		defined(__DRIVERKIT_VERSION_MIN_REQUIRED)
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000 || __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090
 #if __has_builtin(__builtin___memccpy_chk) && __HAS_FIXED_CHK_PROTOTYPES
 #undef memccpy
-/* void *memccpy(void *dst, const void *src, int c, size_t n) */
-#define memccpy(dest, ...) \
-		__builtin___memccpy_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
+#define memccpy(dest, src, c, len)                                  \
+  __builtin___memccpy_chk (dest, src, c, len, __darwin_obsz0 (dest))
 #endif
 #endif
 
 #if __has_builtin(__builtin___memcpy_chk) || defined(__GNUC__)
 #undef memcpy
-/* void *memcpy(void *dst, const void *src, size_t n) */
-#define memcpy(dest, ...) \
-		__builtin___memcpy_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
+#define memcpy(dest, src, len)					\
+  __builtin___memcpy_chk (dest, src, len, __darwin_obsz0 (dest))
 #endif
 
 #if __has_builtin(__builtin___memmove_chk) || defined(__GNUC__)
 #undef memmove
-/* void *memmove(void *dst, const void *src, size_t len) */
-#define memmove(dest, ...) \
-		__builtin___memmove_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
+#define memmove(dest, src, len)					\
+  __builtin___memmove_chk (dest, src, len, __darwin_obsz0 (dest))
 #endif
 
 #if __has_builtin(__builtin___memset_chk) || defined(__GNUC__)
 #undef memset
-/* void *memset(void *b, int c, size_t len) */
-#define memset(dest, ...) \
-		__builtin___memset_chk (dest, __VA_ARGS__, __darwin_obsz0 (dest))
+#define memset(dest, val, len)					\
+  __builtin___memset_chk (dest, val, len, __darwin_obsz0 (dest))
 #endif
 
-#ifndef UNIFDEF_DRIVERKIT
 #if __has_builtin(__builtin___strcpy_chk) || defined(__GNUC__)
 #undef strcpy
-/* char *strcpy(char *dst, const char *src) */
-#define strcpy(dest, ...) \
-		__builtin___strcpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define strcpy(dest, src)					\
+  __builtin___strcpy_chk (dest, src, __darwin_obsz (dest))
 #endif
 
 #if __DARWIN_C_LEVEL >= 200809L
 #if __has_builtin(__builtin___stpcpy_chk) || defined(__GNUC__)
 #undef stpcpy
-/* char *stpcpy(char *dst, const char *src) */
-#define stpcpy(dest, ...) \
-		__builtin___stpcpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define stpcpy(dest, src)					\
+  __builtin___stpcpy_chk (dest, src, __darwin_obsz (dest))
 #endif
-#endif /* __DARWIN_C_LEVEL >= 200809L */
-#endif /* UNIFDEF_DRIVERKIT */
 
-#if __DARWIN_C_LEVEL >= 200809L
 #if __has_builtin(__builtin___stpncpy_chk) || __APPLE_CC__ >= 5666 || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)
 #undef stpncpy
-/* char *stpncpy(char *dst, const char *src, size_t n) */
-#define stpncpy(dest, ...) \
-		__builtin___stpncpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define stpncpy(dest, src, len)					\
+  __builtin___stpncpy_chk (dest, src, len, __darwin_obsz (dest))
 #endif
 #endif /* _DARWIN_C_LEVEL >= 200809L */
 
 #if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
-#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000 || __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090 || \
-		defined(__DRIVERKIT_VERSION_MIN_REQUIRED)
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000 || __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090
 #if __has_builtin(__builtin___strlcpy_chk) && __HAS_FIXED_CHK_PROTOTYPES
 #undef strlcpy
-/* size_t strlcpy(char *dst, const char *source, size_t size) */
-#define strlcpy(dest, ...) \
-		__builtin___strlcpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define strlcpy(dest, src, len)                                 \
+  __builtin___strlcpy_chk (dest, src, len, __darwin_obsz (dest))
 #endif
 
 #if __has_builtin(__builtin___strlcat_chk) && __HAS_FIXED_CHK_PROTOTYPES
 #undef strlcat
-/* size_t strlcat(char *dst, const char *source, size_t size) */
-#define strlcat(dest, ...) \
-		__builtin___strlcat_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define strlcat(dest, src, len)                                 \
+  __builtin___strlcat_chk (dest, src, len, __darwin_obsz (dest))
 #endif
 #endif /* __IPHONE_OS_VERSION_MIN_REQUIRED >= 70000 || __MAC_OS_X_VERSION_MIN_REQUIRED >= 1090 */
 #endif /* __DARWIN_C_LEVEL >= __DARWIN_C_FULL */
 
 #if __has_builtin(__builtin___strncpy_chk) || defined(__GNUC__)
 #undef strncpy
-/* char *strncpy(char *dst, const char *src, size_t n) */
-#define strncpy(dest, ...) \
-		__builtin___strncpy_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define strncpy(dest, src, len)					\
+  __builtin___strncpy_chk (dest, src, len, __darwin_obsz (dest))
 #endif
 
-#ifndef UNIFDEF_DRIVERKIT
 #if __has_builtin(__builtin___strcat_chk) || defined(__GNUC__)
 #undef strcat
-/* char *strcat(char *s1, const char *s2) */
-#define strcat(dest, ...) \
-		__builtin___strcat_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define strcat(dest, src)					\
+  __builtin___strcat_chk (dest, src, __darwin_obsz (dest))
 #endif
-#endif /* UNIFDEF_DRIVERKIT */
 
 #if ! (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED < 32000)
 #if __has_builtin(__builtin___strncat_chk) || defined(__GNUC__)
 #undef strncat
-/* char *strncat(char *s1, const char *s2, size_t n) */
-#define strncat(dest, ...) \
-		__builtin___strncat_chk (dest, __VA_ARGS__, __darwin_obsz (dest))
+#define strncat(dest, src, len)					\
+  __builtin___strncat_chk (dest, src, len, __darwin_obsz (dest))
 #endif
+#endif
+
+#ifdef _undef__has_builtin
+#undef _undef__has_builtin
+#undef __has_builtin
 #endif
 
 #undef __HAS_FIXED_CHK_PROTOTYPES