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[libc] Complete string.h

--- a/libc/include/string.h

+++ b/libc/include/string.h

@@ -4,26 +4,27 @@

 #include <arch/string.h>

-extern char *strcpy(char *dst, const char *src);

-extern char *strncpy(char *dst, const char *src, size_t n);

-extern char *strcat(char *dst, const char *src);

-extern char *strncat(char *dst, const char *src, size_t n);

-extern size_t strxfrm(char *dst, const char *src, size_t n);

-extern size_t strlen(const char *s);

+extern void *memcpy(void * restrict s1, const void * restrict s2, size_t n);

+extern void *memmove(void *s1, const void *s2, size_t n);

+extern char *strcpy(char * restrict s1, const char * restrict s2);

+extern char *strncpy(char * restrict s1, const char * restrict s2, size_t n);

+extern char *strcat(char * restrict s1, const char * restrict s2);

+extern char *strncat(char * restrict s1, const char * restrict s2, size_t n);

+extern int memcmp(const void *s1, const void *s2, size_t n);

 extern int strcmp(const char *s1, const char *s2);

 extern int strcoll(const char *s1, const char *s2);

+extern int strncmp(const char *s1, const char *s2, size_t n);

+extern size_t strxfrm(char * restrict s1, const char * restrict s2, size_t n);

+extern void *memchr(const void *s, int c, size_t n);

 extern char *strchr(const char *s, int c);

+extern size_t strcspn(const char *s1, const char *s2);

+extern char *strpbrk(const char *s1, const char *s2);

 extern char *strrchr(const char *s, int c);

-extern size_t strspn(const char *s, const char *accept);

-extern size_t strcspn(const char *s, const char *reject);

-extern size_t strpbrk(const char *s, const char *accept);

-extern size_t strstr(const char *s, const char *sub);

-extern char *strtok(const char *s, const char *delim);

-

+extern size_t strspn(const char *s1, const char *s2);

+extern char *strstr(const char *s1, const char *s2);

+extern char *strtok(char * restrict s1, const char * restrict s2);

 extern void *memset(void *s, int c, size_t n);

-extern void *memcpy(void *dst, const void *src, size_t n);

-extern void *memmove(void *dst, const void *src, size_t n);

-extern int memcmp(const void *s1, const void *s2, size_t n);

-extern void *memchr(const void *s, int c, size_t n);

+extern char *strerror(int errnum);

+extern size_t strlen(const char *s);

 #endif