X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ftempname.c;h=410213447c1e35a3a4fb600885f83f35768bf3f5;hb=ad82c2fb130fbf3bfd3f7f9aa60e99a19ff9d396;hp=5ead95ea3cc087634ab5b6907e1372de02ee61a6;hpb=9b10f7706c41cdad4cecbc0b17b7eab499b74c49;p=gnulib.git
diff --git a/lib/tempname.c b/lib/tempname.c
index 5ead95ea3..410213447 100644
--- a/lib/tempname.c
+++ b/lib/tempname.c
@@ -1,23 +1,27 @@
-/* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
+/* tempname.c - generate the name of a temporary file.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2009 Free Software Foundation,
+ Inc.
- The GNU C Library is distributed in the hope that it will be useful,
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see . */
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+/* Extracted from glibc sysdeps/posix/tempname.c. See also tmpdir.c. */
-#if HAVE_CONFIG_H
+#if !_LIBC
# include
+# include "tempname.h"
#endif
#include
@@ -36,77 +40,58 @@
# define TMP_MAX 238328
#endif
#ifndef __GT_FILE
-# define __GT_FILE 0
-# define __GT_BIGFILE 1
+# define __GT_FILE 1
# define __GT_DIR 2
# define __GT_NOCREATE 3
#endif
-#if STDC_HEADERS || _LIBC
-# include
-# include
-# include
-#endif
-
-#if HAVE_FCNTL_H || _LIBC
-# include
-#endif
-
-#if HAVE_SYS_TIME_H || _LIBC
-# include
-#endif
+#include
+#include
+#include
-#if HAVE_STDINT_H || _LIBC
-# include
-#endif
-
-#if HAVE_UNISTD_H || _LIBC
-# include
-#endif
+#include
+#include
+#include
+#include
#include
-#if STAT_MACROS_BROKEN
-# undef S_ISDIR
-#endif
-#if !defined S_ISDIR && defined S_IFDIR
-# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
-#endif
-#if !S_IRUSR && S_IREAD
-# define S_IRUSR S_IREAD
-#endif
-#if !S_IRUSR
-# define S_IRUSR 00400
-#endif
-#if !S_IWUSR && S_IWRITE
-# define S_IWUSR S_IWRITE
-#endif
-#if !S_IWUSR
-# define S_IWUSR 00200
-#endif
-#if !S_IXUSR && S_IEXEC
-# define S_IXUSR S_IEXEC
-#endif
-#if !S_IXUSR
-# define S_IXUSR 00100
-#endif
#if _LIBC
# define struct_stat64 struct stat64
#else
# define struct_stat64 struct stat
+# define __open open
+# define __gen_tempname gen_tempname
# define __getpid getpid
# define __gettimeofday gettimeofday
# define __mkdir mkdir
-# define __open open
-# define __open64 open
-# define __lxstat64(version, path, buf) lstat (path, buf)
-# define __xstat64(version, path, buf) stat (path, buf)
+# define __lxstat64(version, file, buf) lstat (file, buf)
+# define __xstat64(version, file, buf) stat (file, buf)
#endif
#if ! (HAVE___SECURE_GETENV || _LIBC)
# define __secure_getenv getenv
#endif
+#ifdef _LIBC
+# include
+# if HP_TIMING_AVAIL
+# define RANDOM_BITS(Var) \
+ if (__builtin_expect (value == UINT64_C (0), 0)) \
+ { \
+ /* If this is the first time this function is used initialize \
+ the variable we accumulate the value in to some somewhat \
+ random value. If we'd not do this programs at startup time \
+ might have a reduced set of possible names, at least on slow \
+ machines. */ \
+ struct timeval tv; \
+ __gettimeofday (&tv, NULL); \
+ value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
+ } \
+ HP_TIMING_NOW (Var)
+# endif
+#endif
+
/* Use the widest available unsigned type if uint64_t is not
available. The algorithm below extracts a number less than 62**6
(approximately 2**35.725) from uint64_t, so ancient hosts where
@@ -116,6 +101,7 @@
# define uint64_t uintmax_t
#endif
+#if _LIBC
/* Return nonzero if DIR is an existent directory. */
static int
direxists (const char *dir)
@@ -186,8 +172,9 @@ __path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
return 0;
}
+#endif /* _LIBC */
-/* These are the characters used in temporary filenames. */
+/* These are the characters used in temporary file names. */
static const char letters[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
@@ -201,21 +188,37 @@ static const char letters[] =
at the time of the call.
__GT_FILE: create the file using open(O_CREAT|O_EXCL)
and return a read-write fd. The file is mode 0600.
- __GT_BIGFILE: same as __GT_FILE but use open64().
__GT_DIR: create a directory, which will be mode 0700.
We use a clever algorithm to get hard-to-predict names. */
int
-__gen_tempname (char *tmpl, int kind)
+__gen_tempname (char *tmpl, int flags, int kind)
{
int len;
char *XXXXXX;
static uint64_t value;
uint64_t random_time_bits;
- int count, fd = -1;
+ unsigned int count;
+ int fd = -1;
int save_errno = errno;
struct_stat64 st;
+ /* A lower bound on the number of temporary files to attempt to
+ generate. The maximum total number of temporary file names that
+ can exist for a given template is 62**6. It should never be
+ necessary to try all these combinations. Instead if a reasonable
+ number of names is tried (we define reasonable as 62**3) fail to
+ give the system administrator the chance to remove the problems. */
+#define ATTEMPTS_MIN (62 * 62 * 62)
+
+ /* The number of times to attempt to generate a temporary file. To
+ conform to POSIX, this must be no smaller than TMP_MAX. */
+#if ATTEMPTS_MIN < TMP_MAX
+ unsigned int attempts = TMP_MAX;
+#else
+ unsigned int attempts = ATTEMPTS_MIN;
+#endif
+
len = strlen (tmpl);
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
{
@@ -227,18 +230,18 @@ __gen_tempname (char *tmpl, int kind)
XXXXXX = &tmpl[len - 6];
/* Get some more or less random data. */
-#if HAVE_GETTIMEOFDAY || _LIBC
+#ifdef RANDOM_BITS
+ RANDOM_BITS (random_time_bits);
+#else
{
struct timeval tv;
__gettimeofday (&tv, NULL);
random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
}
-#else
- random_time_bits = time (NULL);
#endif
value += random_time_bits ^ __getpid ();
- for (count = 0; count < TMP_MAX; value += 7777, ++count)
+ for (count = 0; count < attempts; value += 7777, ++count)
{
uint64_t v = value;
@@ -258,11 +261,9 @@ __gen_tempname (char *tmpl, int kind)
switch (kind)
{
case __GT_FILE:
- fd = __open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
- break;
-
- case __GT_BIGFILE:
- fd = __open64 (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+ fd = __open (tmpl,
+ (flags & ~0777) | O_RDWR | O_CREAT | O_EXCL,
+ S_IRUSR | S_IWUSR);
break;
case __GT_DIR: