__extern int strncasecmp(const char *, const char *, size_t);
__extern char *strcat(char *, const char *);
__extern char *strchr(const char *, int);
+__extern char *index(const char *, int);
__extern char *strrchr(const char *, int);
+__extern char *rindex(const char *, int);
__extern int strcmp(const char *, const char *);
__extern char *strcpy(char *, const char *);
__extern size_t strcspn(const char *, const char *);