char *strcpy(char *s1, const char *s2);
char *strcat(char *s1, const char *s2);
long strcmp(const char *s1, const char *s2);
long strlen(const char *s);
char *strncpy(char *s1, const char *s2, long n);
char *strncat(char *s1, const char *s2, long n);
long strncmp(const char *s1, const char *s2, long n);
void ctopcpy(char *p1, char *p2);
void ptoccpy(char *p1, char *p2);
void setmem(unsigned char *s, long n, short b);
void pstrcpy(register char *p2, char *p1);
void *memcpy(const void *dest, const void *source, long n);