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/* PSPP - a program for statistical analysis.
Copyright (C) 2010, 2011 Free Software Foundation, Inc.
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 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 <http://www.gnu.org/licenses/>. */
/* Functions for temporary files that honor $TMPDIR. */
#include <config.h>
#include "libpspp/temp-file.h"
#include "libpspp/hmapx.h"
#include "libpspp/hash-functions.h"
#include <stdlib.h>
#include "gl/clean-temp.h"
#include "gl/xvasprintf.h"
/* Creates and returns a new temporary file that will be removed automatically
when the process exits. The file is opened in mode "wb+". To close the
file before the process exits, use close_temp_file() to ensure that it gets
deleted early.
Returns NULL if creating the temporary file fails.
This is similar to tmpfile(), except:
- It honors the $TMPDIR environment variable.
*/
static void cleanup (void);
static struct temp_dir *temp_dir;
struct hmapx map;
static void
setup (void)
{
hmapx_init (&map);
temp_dir = create_temp_dir ("pspp", NULL, true);
}
static void
initialise (void)
{
if (temp_dir == NULL)
{
setup ();
if (temp_dir == NULL)
return ;
atexit (cleanup);
}
}
const char *
temp_dir_name (void)
{
initialise ();
if (temp_dir)
return temp_dir->dir_name;
return NULL;
}
static void
cleanup (void)
{
struct hmapx_node *node;
char *fn;
cleanup_temp_dir (temp_dir);
HMAPX_FOR_EACH (fn, node, &map)
{
free (fn);
}
hmapx_destroy (&map);
}
FILE *
create_temp_file (void)
{
static int idx = 0;
char *file_name;
FILE *stream;
initialise ();
if (temp_dir == NULL)
return NULL;
file_name = xasprintf ("%s/%d", temp_dir->dir_name, idx++);
register_temp_file (temp_dir, file_name);
stream = fopen_temp (file_name, "wb+");
if (stream == NULL)
unregister_temp_file (temp_dir, file_name);
else
setvbuf (stream, NULL, _IOFBF, 65536);
hmapx_insert (&map, file_name, hash_pointer (stream, 0));
return stream;
}
/* Closes and removes a temporary file created by create_temp_file(). */
void
close_temp_file (FILE *file)
{
if (file != NULL)
{
struct hmapx_node *node = hmapx_first_with_hash (&map, hash_pointer (file, 0));
char *fn = node->data;
fclose_temp (file);
cleanup_temp_file (temp_dir, fn);
hmapx_delete (&map, node);
free (fn);
}
}
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