97d40d3d4a
us up to version 2.17.50.20070703, at the last GPLv2 commit. Amongst others, this added upstream support for some FreeBSD-specific things that we previously had to manually hack in, such as the OSABI label support, and so on. There are also quite a number of new files, some for cpu's (e.g. SPU) that we may or may not be interested in, but those can be cleaned up later on, if needed.
141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/* Copyright (C) 1991, 1992, 1996, 1998, 2004 Free Software Foundation, Inc.
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This file is derived from mkstemp.c from 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., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include "ansidecl.h"
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/* We need to provide a type for gcc_uint64_t. */
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#ifdef __GNUC__
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__extension__ typedef unsigned long long gcc_uint64_t;
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#else
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typedef unsigned long gcc_uint64_t;
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#endif
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#ifndef TMP_MAX
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#define TMP_MAX 16384
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#endif
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#ifndef O_BINARY
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# define O_BINARY 0
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#endif
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/*
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@deftypefn Replacement int mkstemps (char *@var{pattern}, int @var{suffix_len})
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Generate a unique temporary file name from @var{pattern}.
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@var{pattern} has the form:
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@example
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@var{path}/ccXXXXXX@var{suffix}
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@end example
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@var{suffix_len} tells us how long @var{suffix} is (it can be zero
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length). The last six characters of @var{pattern} before @var{suffix}
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must be @samp{XXXXXX}; they are replaced with a string that makes the
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filename unique. Returns a file descriptor open on the file for
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reading and writing.
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@end deftypefn
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*/
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int
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mkstemps (char *pattern, int suffix_len)
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{
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static const char letters[]
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= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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static gcc_uint64_t value;
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#ifdef HAVE_GETTIMEOFDAY
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struct timeval tv;
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#endif
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char *XXXXXX;
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size_t len;
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int count;
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len = strlen (pattern);
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if ((int) len < 6 + suffix_len
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|| strncmp (&pattern[len - 6 - suffix_len], "XXXXXX", 6))
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{
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return -1;
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}
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XXXXXX = &pattern[len - 6 - suffix_len];
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#ifdef HAVE_GETTIMEOFDAY
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/* Get some more or less random data. */
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gettimeofday (&tv, NULL);
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value += ((gcc_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
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#else
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value += getpid ();
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#endif
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for (count = 0; count < TMP_MAX; ++count)
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{
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gcc_uint64_t v = value;
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int fd;
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/* Fill in the random bits. */
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XXXXXX[0] = letters[v % 62];
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v /= 62;
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XXXXXX[1] = letters[v % 62];
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v /= 62;
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XXXXXX[2] = letters[v % 62];
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v /= 62;
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XXXXXX[3] = letters[v % 62];
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v /= 62;
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XXXXXX[4] = letters[v % 62];
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v /= 62;
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XXXXXX[5] = letters[v % 62];
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fd = open (pattern, O_BINARY|O_RDWR|O_CREAT|O_EXCL, 0600);
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if (fd >= 0)
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/* The file does not exist. */
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return fd;
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/* This is a random value. It is only necessary that the next
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TMP_MAX values generated by adding 7777 to VALUE are different
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with (module 2^32). */
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value += 7777;
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}
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/* We return the null string if we can't find a unique file name. */
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pattern[0] = '\0';
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return -1;
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}
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