FGETLINE
Section: C Library Functions (3)
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BSD mandoc
NAME
fgetline
- get a line from a stream
SYNOPSIS
Fd #include <stdio.h>
Ft char *
Fn fgetline FILE *stream size_t *len
DESCRIPTION
The
Fn fgetline
function
returns a pointer to the next line from the stream referenced by
Fa stream .
The newline character at the end of the line is replaced by a
NUL
If
Fa len
is non-NULL, the length of the line, not counting the terminating
NUL
is stored in the memory location it references.
RETURN VALUES
Upon successful completion a pointer is returned;
this pointer becomes invalid after the next
I/O
operation on
Fa stream
(whether successful or not)
or as soon as the stream is closed.
Otherwise,
NULL
is returned.
The
Fn fgetline
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 occurrs, 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 terminating
NUL
These changes are lost as soon as the pointer becomes invalid.
ERRORS
- Bq Er EBADF
-
The argument
Fa stream
is not a stream open for reading.
The
Fn fgetline
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),
fopen(3),
putc(3)
HISTORY
The
Fn fgetline
function is
Ud .
BUGS
It is not possible to tell whether the final line of an input file
was terminated with a newline.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- ERRORS
-
- SEE ALSO
-
- HISTORY
-
- BUGS
-
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Time: 06:40:37 GMT, May 19, 2025