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.\" @(#)fgetline.3 5.4 (Berkeley) 4/19/91
.Nd get a line from a stream
.Fn fgetline "FILE *stream" "size_t *len"
returns a pointer to the next line from the stream referenced by
The newline character at the end of the line is replaced by a
is non-NULL, the length of the line, not counting the terminating
is stored in the memory location it references.
Upon successful completion a pointer is returned;
this pointer becomes invalid after the next
(whether successful or not)
or as soon as the stream is closed.
does not distinguish between end-of-file and error; the routines
to determine which occurred.
If an error occurrs, the global variable
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
The text to which the returned pointer points may be modified,
provided that no changes are made beyond the terminating
These changes are lost as soon as the pointer becomes invalid.
is not a stream open for reading.
for any of the errors specified for the routines
It is not possible to tell whether the final line of an input file
was terminated with a newline.