-int strerror_r(int, char *, size_t);
-size_t strlen(const char *);
-char *strncat(char *, const char *, size_t);
-int strncmp(const char *, const char *, size_t);
-char *strncpy(char *, const char *, size_t);
-#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
-char *strnstr(const char *, const char *, size_t);
-#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
-char *strpbrk(const char *, const char *);
-char *strrchr(const char *, int);
-size_t strspn(const char *, const char *);
-char *strstr(const char *, const char *);
-char *strtok(char *, const char *);
-size_t strxfrm(char *, const char *, size_t);
-
-/* Nonstandard routines */
-#ifndef _ANSI_SOURCE
-void *memccpy(void *, const void *, int, size_t);
-char *strtok_r(char *, const char *, char **);
-char *strdup(const char *);
-#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
-int bcmp(const void *, const void *, size_t);
-void bcopy(const void *, void *, size_t);
-void bzero(void *, size_t);
-int ffs(int);
-int ffsl(long);
-int fls(int);
-int flsl(long);
-char *index(const char *, int);
-void memset_pattern4(void *, const void *, size_t);
-void memset_pattern8(void *, const void *, size_t);
-void memset_pattern16(void *, const void *, size_t);
-char *rindex(const char *, int);
-int strcasecmp(const char *, const char *);
-size_t strlcat(char *, const char *, size_t);
-size_t strlcpy(char *, const char *, size_t);
-void strmode(int, char *);
-int strncasecmp(const char *, const char *, size_t);
-char *strsep(char **, const char *);
-char *strsignal(int sig);
+size_t strlen(const char *__s);
+char *strncat(char *__s1, const char *__s2, size_t __n);
+int strncmp(const char *__s1, const char *__s2, size_t __n);
+char *strncpy(char *__dst, const char *__src, size_t __n);
+char *strpbrk(const char *__s, const char *__charset);
+char *strrchr(const char *__s, int __c);
+size_t strspn(const char *__s, const char *__charset);
+char *strstr(const char *__big, const char *__little);
+char *strtok(char *__str, const char *__sep);
+size_t strxfrm(char *__s1, const char *__s2, size_t __n);
+__END_DECLS
+
+
+
+/* Additional functionality provided by:
+ * POSIX.1c-1995,
+ * POSIX.1i-1995,
+ * and the omnibus ISO/IEC 9945-1: 1996
+ */
+
+#if __DARWIN_C_LEVEL >= 199506L
+__BEGIN_DECLS
+char *strtok_r(char *__str, const char *__sep, char **__lasts);
+__END_DECLS
+#endif /* __DARWIN_C_LEVEL >= 199506L */
+
+
+
+/* Additional functionality provided by:
+ * POSIX.1-2001
+ */
+
+#if __DARWIN_C_LEVEL >= 200112L
+__BEGIN_DECLS
+int strerror_r(int __errnum, char *__strerrbuf, size_t __buflen);
+char *strdup(const char *__s1);
+void *memccpy(void *__dst, const void *__src, int __c, size_t __n);
+__END_DECLS
+#endif /* __DARWIN_C_LEVEL >= 200112L */
+
+
+
+/* Additional functionality provided by:
+ * POSIX.1-2008
+ */
+
+#if __DARWIN_C_LEVEL >= 200809L
+__BEGIN_DECLS
+#ifndef UNIFDEF_DRIVERKIT
+char *stpcpy(char *__dst, const char *__src);
+#endif /* UNIFDEF_DRIVERKIT */
+char *stpncpy(char *__dst, const char *__src, size_t __n) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
+char *strndup(const char *__s1, size_t __n) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
+size_t strnlen(const char *__s1, size_t __n) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
+char *strsignal(int __sig);
+__END_DECLS
+#endif /* __DARWIN_C_LEVEL >= 200809L */
+
+/* C11 Annex K */
+
+#if defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1
+#include <sys/_types/_rsize_t.h>
+#include <sys/_types/_errno_t.h>
+
+__BEGIN_DECLS
+errno_t memset_s(void *__s, rsize_t __smax, int __c, rsize_t __n) __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0);
+__END_DECLS
+#endif
+
+/* Darwin extensions */
+
+#if __DARWIN_C_LEVEL >= __DARWIN_C_FULL
+#include <sys/_types/_ssize_t.h>
+
+__BEGIN_DECLS
+void *memmem(const void *__big, size_t __big_len, const void *__little, size_t __little_len) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
+void memset_pattern4(void *__b, const void *__pattern4, size_t __len) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_3_0);
+void memset_pattern8(void *__b, const void *__pattern8, size_t __len) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_3_0);
+void memset_pattern16(void *__b, const void *__pattern16, size_t __len) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_3_0);
+
+char *strcasestr(const char *__big, const char *__little);
+char *strnstr(const char *__big, const char *__little, size_t __len);
+size_t strlcat(char *__dst, const char *__source, size_t __size);
+size_t strlcpy(char *__dst, const char *__source, size_t __size);
+void strmode(int __mode, char *__bp);
+char *strsep(char **__stringp, const char *__delim);
+
+/* SUS places swab() in unistd.h. It is listed here for source compatibility */