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SETFSIZE.C
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1994-05-23
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/***************************************************************************
* *
* Squish Developers Kit Source, Version 2.00 *
* Copyright 1989-1994 by SCI Communications. All rights reserved. *
* *
* USE OF THIS FILE IS SUBJECT TO THE RESTRICTIONS CONTAINED IN THE *
* SQUISH DEVELOPERS KIT LICENSING AGREEMENT IN SQDEV.PRN. IF YOU DO NOT *
* FIND THE TEXT OF THIS AGREEMENT IN THE AFOREMENTIONED FILE, OR IF YOU *
* DO NOT HAVE THIS FILE, YOU SHOULD IMMEDIATELY CONTACT THE AUTHOR AT *
* ONE OF THE ADDRESSES LISTED BELOW. IN NO EVENT SHOULD YOU PROCEED TO *
* USE THIS FILE WITHOUT HAVING ACCEPTED THE TERMS OF THE SQUISH *
* DEVELOPERS KIT LICENSING AGREEMENT, OR SUCH OTHER AGREEMENT AS YOU ARE *
* ABLE TO REACH WITH THE AUTHOR. *
* *
* You can contact the author at one of the address listed below: *
* *
* Scott Dudley FidoNet 1:249/106 *
* 777 Downing St. Internet sjd@f106.n249.z1.fidonet.org *
* Kingston, Ont. CompuServe >INTERNET:sjd@f106.n249.z1.fidonet.org *
* Canada K7M 5N3 BBS 1-613-634-3058, V.32bis *
* *
***************************************************************************/
/* name=Function to dynamically change the size of a file
*/
#include <dos.h>
#include "prog.h"
#if defined(__MSDOS__)
#include <stdio.h>
#include <stdlib.h>
#include <io.h>
#include <fcntl.h>
int _fast setfsize(int fd, long size)
{
union REGS r;
long pos=tell(fd);
lseek(fd, size, SEEK_SET);
#ifdef __386__
r.h.ah=0x40;
r.x.ebx=fd;
r.x.ecx=0;
r.x.edx=0;
int386(0x21, &r, &r);
#else
r.h.ah=0x40;
r.x.bx=fd;
r.x.cx=0;
r.x.dx=0;
int86(0x21, &r, &r);
#endif
lseek(fd, pos, SEEK_SET);
return 0;
}
#elif defined(OS_2)
#define INCL_DOSFILEMGR
#include <os2.h>
int _fast setfsize(int fd, long size)
{
return ((int)DosNewSize((HFILE)fd, (ULONG)size));
}
#elif defined(NT)
#include "pwin.h"
int _fast setfsize(int fd, long size)
{
SetFilePointer((HANDLE)fd, size, NULL, FILE_BEGIN);
return (!SetEndOfFile((HANDLE)fd));
}
#else
#error Unknown OS
#endif