GETLINE man page on Archlinux

Printed from

GETLINE(3)		   Linux Programmer's Manual		    GETLINE(3)

       getline, getdelim - delimited string input

       #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:

       getline()  reads an entire line from stream, storing the address of the
       buffer containing the text into *lineptr.  The  buffer  is  null-termi‐
       nated and includes the newline character, if one was found.

       If  *lineptr  is set to NULL and *n is set 0 before the call, then get‐
       line() will allocate a buffer for storing the line.  This buffer should
       be freed by the user program even if getline() failed.

       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 that a line delimiter other
       than newline can be specified as the delimiter argument.	 As with  get‐
       line(),	a  delimiter  character is not added if one was not present in
       the input before end of file was reached.

       On success, getline() and getdelim() return the	number	of  characters
       read,  including	 the delimiter character, but not including the termi‐
       nating 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.

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

       These functions are available since libc 4.6.27.

       Both  getline()	and  getdelim()	 were originally GNU extensions.  They
       were standardized in POSIX.1-2008.

       #define _GNU_SOURCE
       #include <stdio.h>
       #include <stdlib.h>

	   FILE *fp;
	   char *line = NULL;
	   size_t len = 0;
	   ssize_t read;

	   fp = fopen("/etc/motd", "r");
	   if (fp == NULL)

	   while ((read = getline(&line, &len, fp)) != -1) {
	       printf("Retrieved line of length %zu :\n", read);
	       printf("%s", line);


       read(2), fgets(3), fopen(3), fread(3), scanf(3)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  2014-04-06			    GETLINE(3)

List of man pages available for Archlinux

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net