/* Copyright (C) 1991, 1992, 1996, 1998 Free Software Foundation, Inc. This file is derived from mkstemp.c from 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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <sys/types.h> #ifdef HAVE_STDLIB_H #include <stdlib.h> #endif #ifdef HAVE_STRING_H #include <string.h> #endif #include <errno.h> #include <stdio.h> #include <fcntl.h> #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #ifdef HAVE_SYS_TIME_H #include <sys/time.h> #endif #include "ansidecl.h" /* We need to provide a type for gcc_uint64_t. */ #ifdef __GNUC__ __extension__ typedef unsigned long long gcc_uint64_t; #else typedef unsigned long gcc_uint64_t; #endif #ifndef TMP_MAX #define TMP_MAX 16384 #endif /* Generate a unique temporary file name from TEMPLATE. TEMPLATE has the form: <path>/ccXXXXXX<suffix> SUFFIX_LEN tells us how long <suffix> is (it can be zero length). The last six characters of TEMPLATE before <suffix> must be "XXXXXX"; they are replaced with a string that makes the filename unique. Returns a file descriptor open on the file for reading and writing. */ int mkstemps (template, suffix_len) char *template; int suffix_len; { static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; static gcc_uint64_t value; #ifdef HAVE_GETTIMEOFDAY struct timeval tv; #endif char *XXXXXX; size_t len; int count; len = strlen (template); if ((int) len < 6 + suffix_len || strncmp (&template[len - 6 - suffix_len], "XXXXXX", 6)) { return -1; } XXXXXX = &template[len - 6 - suffix_len]; #ifdef HAVE_GETTIMEOFDAY /* Get some more or less random data. */ gettimeofday (&tv, NULL); value += ((gcc_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid (); #else value += getpid (); #endif for (count = 0; count < TMP_MAX; ++count) { gcc_uint64_t v = value; int fd; /* 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 = open (template, O_RDWR|O_CREAT|O_EXCL, 0600); if (fd >= 0) /* The file does not exist. */ return fd; /* This is a random value. It is only necessary that the next TMP_MAX values generated by adding 7777 to VALUE are different with (module 2^32). */ value += 7777; } /* We return the null string if we can't find a unique file name. */ template[0] = '\0'; return -1; }