FreeBSD manual
download PDF document: getline.3.pdf
GETLINE(3) FreeBSD Library Functions Manual GETLINE(3)
NAME
getdelim, getline - get a line from a stream
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
ssize_t
getdelim(char ** restrict linep, size_t * restrict linecapp,
int delimiter, FILE * restrict stream);
ssize_t
getline(char ** restrict linep, size_t * restrict linecapp,
FILE * restrict stream);
DESCRIPTION
The getdelim() function reads a line from stream, delimited by the
character delimiter. The getline() function is equivalent to getdelim()
with the newline character as the delimiter. The delimiter character is
included as part of the line, unless the end of the file is reached.
The caller may provide a pointer to a malloced buffer for the line in
*linep, and the capacity of that buffer in *linecapp. These functions
expand the buffer as needed, as if via realloc(). If linep points to a
NULL pointer, a new buffer will be allocated. In either case, *linep and
*linecapp will be updated accordingly.
RETURN VALUES
The getdelim() and getline() functions return the number of characters
stored in the buffer, excluding the terminating NUL character. The value
-1 is returned if an error occurs, or if end-of-file is reached.
EXAMPLES
The following code fragment reads lines from a file and writes them to
standard output. The fwrite() function is used in case the line contains
embedded NUL characters.
char *line = NULL;
size_t linecap = 0;
ssize_t linelen;
while ((linelen = getline(&line, &linecap, fp)) > 0)
fwrite(line, linelen, 1, stdout);
free(line);
ERRORS
These functions may fail if:
[EINVAL] Either linep or linecapp is NULL.
[EOVERFLOW] No delimiter was found in the first SSIZE_MAX
characters.
These functions may also fail due to any of the errors specified for
fgets() and malloc().
HISTORY
These routines first appeared in FreeBSD 8.0.
BUGS
There are no wide character versions of getdelim() or getline().
FreeBSD 14.0-RELEASE-p11 July 30, 2016 FreeBSD 14.0-RELEASE-p11