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[/] [openrisc/] [tags/] [gnu-src/] [gdb-7.2/] [gdb-7.2-or32-1.0rc3/] [libiberty/] [mkstemps.c] - Rev 810
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/* Copyright (C) 1991, 1992, 1996, 1998, 2004 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 #ifndef O_BINARY # define O_BINARY 0 #endif /* @deftypefn Replacement int mkstemps (char *@var{pattern}, int @var{suffix_len}) Generate a unique temporary file name from @var{pattern}. @var{pattern} has the form: @example @var{path}/ccXXXXXX@var{suffix} @end example @var{suffix_len} tells us how long @var{suffix} is (it can be zero length). The last six characters of @var{pattern} before @var{suffix} must be @samp{XXXXXX}; they are replaced with a string that makes the filename unique. Returns a file descriptor open on the file for reading and writing. @end deftypefn */ int mkstemps (char *pattern, 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 (pattern); if ((int) len < 6 + suffix_len || strncmp (&pattern[len - 6 - suffix_len], "XXXXXX", 6)) { return -1; } XXXXXX = &pattern[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 (pattern, O_BINARY|O_RDWR|O_CREAT|O_EXCL, 0600); if (fd >= 0) /* The file does not exist. */ return fd; if (errno != EEXIST #ifdef EISDIR && errno != EISDIR #endif ) /* Fatal error (EPERM, ENOSPC etc). Doesn't make sense to loop. */ break; /* 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. */ pattern[0] = '\0'; return -1; }
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