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)):
Before glibc 2.10:
getline(), getdelim(): _GNU_SOURCE
Since glibc 2.10:
getline(),  getdelim():  _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >=
700

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 NULL, then getline() will allocate a buffer for storing the line, which should be freed by the user program. (In this case, the value in *n is ignored.)

Alternatively, before calling getline(), *lineptr can contain a pointer to a malloc(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 buffer address and allocated size respectively.

getdelim() works like getline(), except 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. 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-offile condition).

ERRORS

EINVAL Bad arguments (n or lineptr is NULL, or stream is not valid).

VERSIONS

These functions are available since libc 4.6.27.

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);
exit(EXIT_SUCCESS);
}

COLOPHON

This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

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See also