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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This 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.
This 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 this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
#include "mysys_priv.h"
#include <m_string.h>
#include "my_static.h"
#include "mysys_err.h"
#define TMP_EXT ".tmp" /* Extension of tempfile */
#if ! defined(P_tmpdir)
#define P_tmpdir ""
#endif
#ifdef HAVE_TEMPNAM
#ifndef MSDOS
extern char **environ;
#endif
#endif
/* Make a uniq temp file name by using dir and adding something after
pfx to make name uniq. Name is made by adding a uniq 8 length-string and
TMP_EXT after pfx.
Returns pointer to malloced area for filename. Should be freed by
free().
The name should be uniq, but it isn't checked if it file allready exists.
Uses tempnam() if function exist on system.
This function fixes that if dir is given it's used. For example
MSDOS tempnam() uses always TMP environment-variable if it exists.
*/
/* ARGSUSED */
my_string my_tempnam(const char *dir, const char *pfx,
myf MyFlags __attribute__((unused)))
{
#ifdef _MSC_VER
char temp[FN_REFLEN],*end,*res,**old_env,*temp_env[1];
old_env=environ;
if (dir)
{
end=strend(dir)-1;
if (!dir[0])
{ /* Change empty string to current dir */
temp[0]= FN_CURLIB;
temp[1]= 0;
dir=temp;
}
else if (*end == FN_DEVCHAR)
{ /* Get current dir for drive */
_fullpath(temp,dir,FN_REFLEN);
dir=temp;
}
else if (*end == FN_LIBCHAR && dir < end && end[-1] != FN_DEVCHAR)
{
strmake(temp,dir,(uint) (end-dir)); /* Copy and remove last '\' */
dir=temp;
}
environ=temp_env; /* Force use of dir (dir not checked) */
temp_env[0]=0;
}
res=tempnam((char*) dir,(my_string) pfx);
environ=old_env;
return res;
#else
#ifdef __ZTC__
if (!dir)
{ /* If empty test first if TMP can be used */
dir=getenv("TMP");
}
return tempnam((char*) dir,(my_string) pfx); /* Use stand. dir with prefix */
#else
#ifdef HAVE_TEMPNAM
char temp[2],*res,**old_env,*temp_env[1];
if (dir && !dir[0])
{ /* Change empty string to current dir */
temp[0]= FN_CURLIB;
temp[1]= 0;
dir=temp;
}
old_env=environ;
if (dir)
{ /* Don't use TMPDIR if dir is given */
environ=temp_env;
temp_env[0]=0;
}
res=tempnam((char*) dir,(my_string) pfx); /* Use stand. dir with prefix */
environ=old_env;
if (!res)
DBUG_PRINT("error",("Got error: %d from tempnam",errno));
return res;
#else
register long uniq;
register int length;
my_string pos,end_pos;
DBUG_ENTER("my_tempnam");
/* Make a uniq nummber */
pthread_mutex_lock(&THR_LOCK_open);
uniq= ((long) getpid() << 20) + (long) _my_tempnam_used++ ;
pthread_mutex_unlock(&THR_LOCK_open);
if (!dir && !(dir=getenv("TMPDIR"))) /* Use this if possibly */
dir=P_tmpdir; /* Use system default */
length=strlen(dir)+strlen(pfx)+1;
DBUG_PRINT("test",("mallocing %d byte",length+8+sizeof(TMP_EXT)+1));
if (!(pos=(char*) malloc(length+8+sizeof(TMP_EXT)+1)))
{
if (MyFlags & MY_FAE+MY_WME)
my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG),
length+8+sizeof(TMP_EXT)+1);
DBUG_RETURN(NullS);
}
end_pos=strmov(pos,dir);
if (end_pos != pos && end_pos[-1] != FN_LIBCHAR)
*end_pos++=FN_LIBCHAR;
end_pos=strmov(end_pos,pfx);
for (length=0 ; length < 8 && uniq ; length++)
{
*end_pos++= _dig_vec[(int) (uniq & 31)];
uniq >>= 5;
}
VOID(strmov(end_pos,TMP_EXT));
DBUG_PRINT("exit",("tempnam: '%s'",pos));
DBUG_RETURN(pos);
#endif /* HAVE_TEMPNAM */
#endif /* __ZTC__ */
#endif /* _MSC_VER */
} /* my_tempnam */
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