char *memreadlinelen(char *start, char *buf, int maxlen, int *retlen);
const char *cmemreadline(const char *start, char *buf, int maxlen);
const char *cmemreadlinelen(const char *start, char *buf, int maxlen, int *retlen);
char *memreadlinelen(char *start, char *buf, int maxlen, int *retlen);
const char *cmemreadline(const char *start, char *buf, int maxlen);
const char *cmemreadlinelen(const char *start, char *buf, int maxlen, int *retlen);