getline—read a line from a file #include <stdio.h>
ssize_t getline(char **bufptr, size_t *n, FILE *fp);
Description
getline reads a file fp up to and possibly including the
newline character. The line is read into a buffer pointed to
by bufptr and designated with size *n. If the buffer is
not large enough, it will be dynamically grown by getdelim.
As the buffer is grown, the pointer to the size n will be
updated.
getline is equivalent to getdelim(bufptr, n, '\n', fp);
Returns
getline returns -1 if no characters were successfully read,
otherwise, it returns the number of bytes successfully read.
at end of file, the result is nonzero.
Portability
getline is a glibc extension.
No supporting OS subroutines are directly required.