string.h

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extern int strlen(const char *str);

extern int strcmp(const char *str1, const char *str2);

extern char *strcpy(char *dest, const char *src);

extern char *strncpy(char *dest, char *src, size_t n);

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

extern void memset(void *buffer, int data, size_t size);

extern void memcpy(void *dest, void *src, size_t size);

extern int memcmp(void *dest, void *src, size_t size);

extern char *strdup(const char *s);

extern char *strndup(const char *s, size_t n);

extern char *strdupa(const char *s);

extern char *strndupa(const char *s, size_t n);