FGETLN(3) BSD Library Functions Manual FGETLN(3)

NAME
     ffggeettllnn - get a line from a stream

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     char *
     ffggeettllnn(FILE *stream, sizet *len);

DESCRIPTION
     The ffggeettllnn() function returns a pointer to the next line from the stream
     referenced by stream.  This line is not a C string as it does not end
     with a terminating NUL character.  The length of the line, including the
     final newline, is stored in the memory location to which len points.
     (Note, however, that if the line is the last in a file that does not end
     in a newline, the returned text will not contain a newline.)

RETURN VALUES
     Upon successful completion a pointer is returned; this pointer becomes
     invalid after the next I/O operation on stream (whether successful or
     not) or as soon as the stream is closed.  Otherwise, NULL is returned.
     The ffggeettllnn() function does not distinguish between end-of-file and error;
     the routines feof(3) and ferror(3) must be used to determine which
     occurred.  If an error occurs, the global variable errno is set to indi-
     cate the error.  The end-of-file condition is remembered, even on a ter-
     minal, and all subsequent attempts to read will return NULL until the
     condition is cleared with clearerr(3).

     The text to which the returned pointer points may be modified, provided
     that no changes are made beyond the returned size.  These changes are
     lost as soon as the pointer becomes invalid.

EERRRROORRSS
     [EBADF]            The argument stream is not a stream open for reading.

     The ffggeettllnn() function may also fail and set errno for any of the errors
     specified for the routines fflush(3), malloc(3), read(2), stat(2), or
     realloc(3).

SEE ALSO
     ferror(3), fgets(3), fgetwln(3), fopen(3), putc(3)

HISTORY     The ffggeettllnn() function first appeared in 4.4BSD.

BSD                             April 19, 1994                             BSD