gets(3) - phpMan

GETS(3)                    Linux Programmer's Manual                   GETS(3)
NAME
       gets - get a string from standard input (DEPRECATED)
SYNOPSIS
       #include <stdio.h>
       char *gets(char *s);
DESCRIPTION
       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).
RETURN VALUE
       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.
ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +----------+---------------+---------+
       |Interface | Attribute     | Value   |
       +----------+---------------+---------+
       |gets()    | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       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 ver-
       sion  2.16, glibc header files don't expose the function declaration if
       the _ISOC11_SOURCE feature test macro is defined.
BUGS
       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
SEE ALSO
       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)
COLOPHON
       This  page  is  part of release 4.15 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/.
GNU                               2017-09-15                           GETS(3)