gets — get a string from standard input (DEPRECATED)
#include <stdio.h>
char
*gets( |
char *s); |
Never use this function.
gets() reads a line from
stdin into the buffer pointed to
by s until either a
terminating newline or EOF,
which it replaces with a null byte ('\0'). No check for
buffer overrun is performed (see BUGS below).
gets() returns s on success, and NULL on error
or when end of file occurs while no characters have been
read. However, given the lack of buffer overrun checking,
there can be no guarantees that the function will even
return.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
gets() |
Thread safety | MT-Safe |
C89, C99, POSIX.1-2001.
LSB deprecates gets().
POSIX.1-2008 marks gets()
obsolescent. ISO C11 removes the specification of
gets() from the C language, and
since version 2.16, glibc header files don't expose the
function declaration if the _ISOC11_SOURCE feature test macro is
defined.
Never use gets(). Because it
is impossible to tell without knowing the data in advance how
many characters gets() will
read, and because gets() will
continue to store characters past the end of the buffer, it
is extremely dangerous to use. It has been used to break
computer security. Use fgets()
instead.
For more information, see CWE-242 (aka "Use of Inherently Dangerous Function") at http://cwe.mitre.org/data/definitions/242.html
read(2), write(2), ferror(3), fgetc(3), fgets(3), fgetwc(3), fgetws(3), fopen(3), fread(3), fseek(3), getline(3), getwchar(3), puts(3), scanf(3), ungetwc(3), unlocked_stdio(3), feature_test_macros(7)
This page is part of release 4.07 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
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) 1993 by Thomas Koenig (ig25rz.uni-karlsruhe.de) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END Modified Wed Jul 28 11:12:07 1993 by Rik Faith (faithcs.unc.edu) Modified Fri Sep 8 15:48:13 1995 by Andries Brouwer (aebcwi.nl) Modified 2013-12-31, David Malcolm <dmalcolmredhat.com> Split gets(3) into its own page; fgetc() et al. move to fgetc(3) |