NAME

     fgetln — get a line from a stream

LIBRARY

     library “libbsd”

SYNOPSIS

     #include <stdio.h>
     (See libbsd(7) for include usage.)

     char *
     fgetln(FILE *stream, size_t *len);

DESCRIPTION

     The fgetln() 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 and is guaranteed to be greater than 0 upon successful completion.  (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 fgetln() 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 indicate the error.  The end-of-file
     condition is remembered, even on a terminal, 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.

ERRORS

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

     The fgetln() 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(3bsd), fopen(3), putc(3)

HISTORY

     The fgetln() function first appeared in 4.4BSD.