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-rw-r--r--stdio-common/tmpnam.c43
1 files changed, 25 insertions, 18 deletions
diff --git a/stdio-common/tmpnam.c b/stdio-common/tmpnam.c
index 88dd0a4..44397bc 100644
--- a/stdio-common/tmpnam.c
+++ b/stdio-common/tmpnam.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1993 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1993, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -16,27 +16,34 @@ License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
-#include <ansidecl.h>
-#include <stddef.h>
#include <stdio.h>
#include <string.h>
-/* Generate a unique filename in P_tmpdir. */
+/* Generate a unique filename in P_tmpdir.
+
+ This function is *not* thread safe! */
char *
-DEFUN(tmpnam, (s), register char *s)
+tmpnam (char *s)
{
- register char *t = __stdio_gen_tempname((CONST char *) NULL,
- (CONST char *) NULL, 0,
- (size_t *) NULL, (FILE **) NULL);
-
- if (t == NULL)
- return NULL;
-
- if (s != NULL)
- (void) strcpy(s, t);
- else
- s = t;
-
- return s;
+ /* By using two buffers we manage to be thread safe in the case
+ where S != NULL. */
+ static char buf[L_tmpnam];
+ char *tmpbuf[L_tmpnam];
+ char *result;
+
+ /* In the following call we use the buffer pointed to by S if
+ non-NULL although we don't know the size. But we limit the size
+ to FILENAME_MAX characters in any case. */
+ result = __stdio_gen_tempname (s ?: tmpbuf, L_tmpnam, (const char *) NULL,
+ (const char *) NULL, 0,
+ (size_t *) NULL, (FILE **) NULL);
+
+ if (result != NULL && s == NULL)
+ {
+ memcpy (buf, result, L_tmpnam);
+ result = buf;
+ }
+
+ return result;
}