60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* Copyright (C) 1991, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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link_warning (gets, "the `gets' function is dangerous and should not be used.")
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/* Read a newline-terminated string from stdin into S,
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removing the trailing newline. Return S or NULL. */
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char *
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gets (s)
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char *s;
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{
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register char *p = s;
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register int c;
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FILE *stream = stdin;
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if (!__validfp (stream) || p == NULL)
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{
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__set_errno (EINVAL);
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return NULL;
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}
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if (feof (stream) || ferror (stream))
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return NULL;
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while ((c = getchar ()) != EOF)
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if (c == '\n')
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break;
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else
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*p++ = c;
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*p = '\0';
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/* Return null if we had an error, or if we got EOF
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before writing any characters. */
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if (ferror (stream) || (feof (stream) && p == s))
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return NULL;
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return s;
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}
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