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[glibc.git] / stdio / gets.c
blob42b114906597fa35ccb508304f1040098dd18e35
1 /* Copyright (C) 1991, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <stdio.h>
20 #include <errno.h>
21 #include <string.h>
23 link_warning (gets, "the `gets' function is dangerous and should not be used.")
25 /* Read a newline-terminated string from stdin into S,
26 removing the trailing newline. Return S or NULL. */
27 char *
28 gets (s)
29 char *s;
31 register char *p = s;
32 register int c;
33 FILE *stream = stdin;
35 if (!__validfp (stream) || p == NULL)
37 __set_errno (EINVAL);
38 return NULL;
41 if (feof (stream) || ferror (stream))
42 return NULL;
44 while ((c = getchar ()) != EOF)
45 if (c == '\n')
46 break;
47 else
48 *p++ = c;
50 *p = '\0';
52 /* Return null if we had an error, or if we got EOF
53 before writing any characters. */
55 if (ferror (stream) || (feof (stream) && p == s))
56 return NULL;
58 return s;