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e5448d7ad2
2000-09-26 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/gethostid.c (sethostid): Use O_TRUNC to remove possible garbage at the end of the file. * stdio-common/tmpnam_r.c: Warn about insecure tmpnam_r. * stdio-common/tmpnam.c: Warn about insecure tmpnam. * stdio-common/tempnam.c: Warn about insecure tempnam. * misc/mktemp.c: Warn about insecure mktemp.
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Copyright (C) 1991,1993,1996-1999,2000 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 <string.h>
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static char tmpnam_buffer[L_tmpnam];
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/* Generate a unique filename in P_tmpdir.
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This function is *not* thread safe! */
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char *
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tmpnam (char *s)
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{
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/* By using two buffers we manage to be thread safe in the case
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where S != NULL. */
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char tmpbuf[L_tmpnam];
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/* In the following call we use the buffer pointed to by S if
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non-NULL although we don't know the size. But we limit the size
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to L_tmpnam characters in any case. */
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if (__path_search (s ? : tmpbuf, L_tmpnam, NULL, NULL, 0))
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return NULL;
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if (__gen_tempname (s ? : tmpbuf, __GT_NOCREATE))
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return NULL;
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if (s == NULL)
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return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam);
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return s;
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}
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link_warning (tmpnam,
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"the use of `tmpnam' is dangerous, better use `mkstemp'")
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