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authorPerberos <[email protected]>2011-11-09 22:53:33 -0300
committerPerberos <[email protected]>2011-11-09 22:53:33 -0300
commit70438138096a47b2505ac55634cd94947ce378b6 (patch)
treee45e49dda10a71616466500a4ab65d1c54b5f6c1 /src/mkdtemp.c
downloadengrampa-70438138096a47b2505ac55634cd94947ce378b6.tar.bz2
engrampa-70438138096a47b2505ac55634cd94947ce378b6.tar.xz
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+/* Copyright (C) 1999, 2001-2002 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
+ 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.
+
+ The GNU C Library 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.
+
+ 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 misc/mkdtemp.c and sysdeps/posix/tempname.c. */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+/* Specification. */
+#include "mkdtemp.h"
+
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(Val) errno = (Val)
+#endif
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <stdio.h>
+#ifndef TMP_MAX
+# define TMP_MAX 238328
+#endif
+
+#if HAVE_STDINT_H_WITH_UINTMAX || _LIBC
+# include <stdint.h>
+#endif
+
+#if HAVE_INTTYPES_H_WITH_UINTMAX || _LIBC
+# include <inttypes.h>
+#endif
+
+#if HAVE_UNISTD_H || _LIBC
+# include <unistd.h>
+#endif
+
+#if HAVE_GETTIMEOFDAY || _LIBC
+# if HAVE_SYS_TIME_H || _LIBC
+# include <sys/time.h>
+# endif
+#else
+# if HAVE_TIME_H || _LIBC
+# include <time.h>
+# endif
+#endif
+
+#include <sys/stat.h>
+#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 __getpid getpid
+# define __gettimeofday gettimeofday
+# define __mkdir mkdir
+#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
+ uintmax_t is only 32 bits lose about 3.725 bits of randomness,
+ which is better than not having mkstemp at all. */
+#if !defined UINT64_MAX && !defined uint64_t
+# define uint64_t uintmax_t
+#endif
+
+/* These are the characters used in temporary filenames. */
+static const char letters[] =
+"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+/* Generate a temporary file name based on TMPL. TMPL must match the
+ rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
+ does not exist at the time of the call to __gen_tempname. TMPL is
+ overwritten with the result.
+
+ KIND is:
+ __GT_DIR: create a directory, which will be mode 0700.
+
+ We use a clever algorithm to get hard-to-predict names. */
+static int
+gen_tempname (tmpl)
+ char *tmpl;
+{
+ int len;
+ char *XXXXXX;
+ static uint64_t value;
+ uint64_t random_time_bits;
+ int count, fd = -1;
+ int save_errno = errno;
+
+ len = strlen (tmpl);
+ if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ /* This is where the Xs start. */
+ XXXXXX = &tmpl[len - 6];
+
+ /* Get some more or less random data. */
+#ifdef RANDOM_BITS
+ RANDOM_BITS (random_time_bits);
+#else
+# if HAVE_GETTIMEOFDAY || _LIBC
+ {
+ 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
+#endif
+ value += random_time_bits ^ __getpid ();
+
+ for (count = 0; count < TMP_MAX; value += 7777, ++count)
+ {
+ uint64_t v = value;
+
+ /* Fill in the random bits. */
+ XXXXXX[0] = letters[v % 62];
+ v /= 62;
+ XXXXXX[1] = letters[v % 62];
+ v /= 62;
+ XXXXXX[2] = letters[v % 62];
+ v /= 62;
+ XXXXXX[3] = letters[v % 62];
+ v /= 62;
+ XXXXXX[4] = letters[v % 62];
+ v /= 62;
+ XXXXXX[5] = letters[v % 62];
+
+ fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
+
+ if (fd >= 0)
+ {
+ __set_errno (save_errno);
+ return fd;
+ }
+ else if (errno != EEXIST)
+ return -1;
+ }
+
+ /* We got out of the loop because we ran out of combinations to try. */
+ __set_errno (EEXIST);
+ return -1;
+}
+
+/* Generate a unique temporary directory from TEMPLATE.
+ The last six characters of TEMPLATE must be "XXXXXX";
+ they are replaced with a string that makes the filename unique.
+ The directory is created, mode 700, and its name is returned.
+ (This function comes from OpenBSD.) */
+char *
+mkdtemp (template)
+ char *template;
+{
+ if (gen_tempname (template))
+ return NULL;
+ else
+ return template;
+}