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/*
* (C) Copyright 1990, 1991 Tom Dinger
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* A "DOS-aware" chdir() function, that will change current drive as well.
*
* chdir( "B:" ) -- changes to the default directory, on drive B:
* chdir( "C:\FOO" ) changes to the specified directory, on drive C:
* chdir( "\BAR" ) changes to the specified directory on the current
* drive.
*/
#include <stdlib.h>
#include <ctype.h>
#include <direct.h>
#include <dos.h>
#include <errno.h>
#include "config.h"
#ifdef chdir
#undef chdir
#endif
/* We should have the line:
*
* #define chdir perl_chdir
*
* in some header for perl (I put it in config.h) so that all
* references to chdir() become references to this function.
*/
/*------------------------------------------------------------------*/
#if defined(BUGGY_MSC5) /* only needed for MSC 5.1 */
int _chdrive( int drivenum )
{
unsigned int ndrives;
unsigned int tmpdrive;
_dos_setdrive( drivenum, &ndrives );
/* check for illegal drive letter */
_dos_getdrive( &tmpdrive );
return (tmpdrive != drivenum) ? -1 : 0 ;
}
#endif
/*-----------------------------------------------------------------*/
int perl_chdir( char * path )
{
int drive_letter;
unsigned int drivenum;
if ( path && *path && (path[1] == ':') )
{
/* The path starts with a drive letter */
/* Change current drive */
drive_letter = *path;
if ( isalpha(drive_letter) )
{
/* Drive letter legal */
if ( islower(drive_letter) )
drive_letter = toupper(drive_letter);
drivenum = drive_letter - 'A' + 1;
/* Change drive */
if ( _chdrive( drivenum ) == -1 )
{
/* Drive change failed -- must be illegal drive letter */
errno = ENODEV;
return -1;
}
/* Now see if that's all we do */
if ( ! path[2] )
return 0; /* no path after drive -- all done */
}
/* else drive letter illegal -- fall into "normal" chdir */
}
/* Here with some path as well */
return chdir( path );
/* end perl_chdir() */
}
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