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/* Copyright (C) 2000 MySQL AB
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "mysys/mysys_priv.h"
#include <mystrings/m_string.h>
#include "my_static.h"
#include "mysys/mysys_err.h"
#include <stdio.h>
#include <errno.h>
#include <string>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
using namespace std;
/*
@brief
Create a temporary file with unique name in a given directory
@details
create_temp_file
to pointer to buffer where temporary filename will be stored
dir directory where to create the file
prefix prefix the filename with this
MyFlags Magic flags
@return
File descriptor of opened file if success
-1 and sets errno if fails.
@note
The behaviour of this function differs a lot between
implementation, it's main use is to generate a file with
a name that does not already exist.
The implementation using mkstemp should be considered the
reference implementation when adding a new or modifying an
existing one
*/
File create_temp_file(char *to, const char *dir, const char *prefix, myf MyFlags)
{
File file= -1;
#if defined(_ZTC__)
if (!dir)
dir=getenv("TMPDIR");
if ((res=tempnam((char*) dir,(char *) prefix)))
{
strncpy(to,res,FN_REFLEN-1);
(*free)(res);
file=my_create(to, 0, mode | O_EXCL, MyFlags);
}
#elif defined(HAVE_MKSTEMP)
{
File org_file;
string prefix_str;
prefix_str= prefix ? prefix : "tmp.";
prefix_str.append("XXXXXX");
if (!dir && ! (dir =getenv("TMPDIR")))
dir= P_tmpdir;
if (strlen(dir)+prefix_str.length() > FN_REFLEN-2)
{
errno=my_errno= ENAMETOOLONG;
return(file);
}
strcpy(convert_dirname(to,dir,NULL),prefix_str.c_str());
org_file=mkstemp(to);
/* TODO: This was old behavior, but really don't we want to
* unlink files immediately under all circumstances?
* if (mode & O_TEMPORARY)
(void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
*/
file=my_register_filename(org_file, to, EE_CANTCREATEFILE, MyFlags);
/* If we didn't manage to register the name, remove the temp file */
if (org_file >= 0 && file < 0)
{
int tmp=my_errno;
close(org_file);
(void) my_delete(to, MYF(MY_WME | ME_NOINPUT));
my_errno=tmp;
}
}
#elif defined(HAVE_TEMPNAM)
{
(void)MyFlags;
char *res,**old_env,*temp_env[1];
if (dir && !dir[0])
{ /* Change empty string to current dir */
to[0]= FN_CURLIB;
to[1]= 0;
dir=to;
}
old_env= (char**) environ;
if (dir)
{ /* Don't use TMPDIR if dir is given */
environ=(const char**) temp_env;
temp_env[0]=0;
}
if ((res=tempnam((char*) dir, (char*) prefix)))
{
strncpy(to,res,FN_REFLEN-1);
(*free)(res);
file=my_create(to,0,
(int) (O_RDWR | O_TRUNC | O_EXCL),
MYF(MY_WME));
}
environ=(const char**) old_env;
}
#else
#error No implementation found for create_temp_file
#endif
if (file >= 0)
my_tmp_file_created++;
return(file);
}
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