1 #ifndef __STRING_H 2 #define __STRING_H 3 4 extern unsigned long strlen(const char *buf); 5 extern char *strcat(char *dest, const char *src); 6 extern char *strcpy(char *dest, const char *src); 7 extern int strcmp(const char *a, const char *b); 8 extern char *strchr(const char *s, int c); 9 char *strstr(const char *haystack, const char *needle); 10 extern void *memset(void *s, int c, size_t n); 11 extern void *memcpy(void *dest, const void *src, size_t n); 12 extern int memcmp(const void *s1, const void *s2, size_t n); 13 extern void *memmove(void *dest, const void *src, size_t n); 14 extern void *memchr(const void *s, int c, size_t n); 15 16 #endif /* _STRING_H */ 17