GETLINE(3) | Linux Programmer's Manual | GETLINE(3) |
NAME
getline, getdelim - delimited string inputSYNOPSIS
#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.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.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);
}
SEE ALSO
read(2), fgets(3), fopen(3), fread(3), gets(3), scanf(3)COLOPHON
This page is part of release 3.53 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/.2013-04-19 | GNU |