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sourceware.org Git - newlib-cygwin.git/blob - newlib/libc/stdio/gets.c
2 * Copyright (c) 1990 The Regents of the University of California.
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 <<gets>>---get character string (obsolete, use <<fgets>> instead)
30 char *gets(char *<[buf]>);
32 char *_gets_r(struct _reent *<[reent]>, char *<[buf]>);
40 char *_gets_r(<[reent]>, <[buf]>)
41 struct _reent *<[reent]>;
45 Reads characters from standard input until a newline is found.
46 The characters up to the newline are stored in <[buf]>. The
47 newline is discarded, and the buffer is terminated with a 0.
49 This is a @emph{dangerous} function, as it has no way of checking
50 the amount of space available in <[buf]>. One of the attacks
51 used by the Internet Worm of 1988 used this to overrun a
52 buffer allocated on the stack of the finger daemon and
53 overwrite the return address, causing the daemon to execute
54 code downloaded into it over the connection.
56 The alternate function <<_gets_r>> is a reentrant version. The extra
57 argument <[reent]> is a pointer to a reentrancy structure.
61 <<gets>> returns the buffer passed to it, with the data filled
62 in. If end of file occurs with some data already accumulated,
63 the data is returned with no other indication. If end of file
64 occurs with no data in the buffer, NULL is returned.
66 Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
67 <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
75 _DEFUN(_gets_r
, (ptr
, buf
),
76 struct _reent
*ptr _AND
80 register char *s
= buf
;
83 while ((c
= __sgetc_r (ptr
, stdin
)) != '\n')
105 return _gets_r (_REENT
, buf
);
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