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GETLINE(3) Linux Programmer's Manual GETLINE(3)
NAME
getline, getdelim - delimited string input
SYNOPSIS
#include <stdio.h>
ssize_t getline(char **lineptr, size_t *n, FILE *stream);
ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getline(), getdelim():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700
Before glibc 2.10:
_GNU_SOURCE
DESCRIPTION
getline() reads an entire line from stream, storing the address of the buffer containing
the text into *lineptr. The buffer is null-terminated and includes the newline character,
if one was found.
If *lineptr is set to NULL and *n is set 0 before the call, then getline() will allocate a
buffer for storing the line. This buffer should be freed by the user program even if get‐
line() failed.
Alternatively, before calling getline(), *lineptr can contain a pointer to a mal‐
loc(3)-allocated buffer *n bytes in size. If the buffer is not large enough to hold the
line, getline() resizes it with realloc(3), updating *lineptr and *n as necessary.
In either case, on a successful call, *lineptr and *n will be updated to reflect the buf‐
fer address and allocated size respectively.
getdelim() works like getline(), except that a line delimiter other than newline can be
specified as the delimiter argument. As with getline(), a delimiter character is not
added if one was not present in the input before end of file was reached.
RETURN VALUE
On success, getline() and getdelim() return the number of characters read, including the
delimiter character, but not including the terminating null byte ('\0'). This value can
be used to handle embedded null bytes in the line read.
Both functions return -1 on failure to read a line (including end-of-file condition). In
the event of an error, errno is set to indicate the cause.
ERRORS
EINVAL Bad arguments (n or lineptr is NULL, or stream is not valid).
CONFORMING TO
Both getline() and getdelim() were originally GNU extensions. They were standardized in
POSIX.1-2008.
EXAMPLE
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
int
main(void)
{
FILE *fp;
char *line = NULL;
size_t len = 0;
ssize_t read;
fp = fopen("/etc/motd", "r");
if (fp == NULL)
exit(EXIT_FAILURE);
while ((read = getline(&line, &len, fp)) != -1) {
printf("Retrieved line of length %zu :\n", read);
printf("%s", line);
}
free(line);
fclose(fp);
exit(EXIT_SUCCESS);
}
SEE ALSO
read(2), fgets(3), fopen(3), fread(3), scanf(3)
COLOPHON
This page is part of release 3.74 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/man-pages/.
GNU 2014-08-19 GETLINE(3)
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