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xmstest.cpp
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1993-11-22
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//--------------------------------------------------------------------------
//
// XMSTEST.CPP: Test program for XMS class.
// Copyright (c) J.English 1993.
// Author's address: je@unix.brighton.ac.uk
//
// Permission is granted to use copy and distribute the
// information contained in this file provided that this
// copyright notice is retained intact and that any software
// or other document incorporating this file or parts thereof
// makes the source code for the library of which this file
// is a part freely available.
//
//--------------------------------------------------------------------------
//
// Revision history:
// 2.0 Nov 1993 Initial coding
//
//--------------------------------------------------------------------------
#include "xms.h"
#include "doserror.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
//--------------------------------------------------------------------------
//
// Global data.
//
DOSerror e; // guard against critical errors and control-breaks
XMS* desc [100]; // array of pointers to XMS descriptors
int ndesc = 0; // number of descriptors
//--------------------------------------------------------------------------
//
// Function prototypes.
//
char menu (); // display menu & get user's choice
void XMSstats (); // 1. XMS statistics
void blocksizes (); // 2. List block sizes
void allocate (); // 3. Allocate block
void deallocate (); // 4. Deallocate block
void copy (); // 5. Copy block
void resize (); // 6. Resize block
//--------------------------------------------------------------------------
//
// Main program.
//
// A menu of choices is displayed, allowing the user to exercise
// each of the XMS functions available (with the exception of
// XMS-to-XMS copying).
//
void main ()
{
XMSstats();
char choice;
for (;;)
{
choice = menu ();
if (choice == 'X')
break;
switch (choice)
{
case '1':
XMSstats ();
break;
case '2':
blocksizes ();
break;
case '3':
allocate ();
break;
case '4':
deallocate ();
break;
case '5':
copy ();
break;
case '6':
resize ();
break;
}
}
for (int i = 0; i < ndesc; i++)
delete desc[i];
}
//--------------------------------------------------------------------------
//
// Display menu and get user choice.
//
// The choice must be a line containing a single character from 1 to 6
// (or X for exit).
//
char menu ()
{
printf ("\nChoose desired operation:\n"
" 1) XMS statistics\n"
" 2) List block sizes\n"
" 3) Allocate block\n"
" 4) Deallocate block\n"
" 5) Copy block\n"
" 6) Resize block\n"
" X) Exit program\n");
char buff [80];
for (;;)
{
printf ("Enter your choice: ");
fgets (buff, 80, stdin);
if ((buff[0] == 'x' || buff[0] == 'X') && buff[1] == '\n')
return 'X';
if (buff[0] < '1' || buff[0] > '6' || buff[1] != '\n')
printf ("Invalid choice!\a\n");
else
break;
}
printf ("\n");
return buff[0];
}
//--------------------------------------------------------------------------
//
// Display XMS statistics.
//
void XMSstats ()
{
printf ("XMS available: %ld bytes\nLargest block: %ld bytes\n",
XMS::available(), XMS::largest());
}
//--------------------------------------------------------------------------
//
// List block sizes.
//
void blocksizes ()
{
int flag = 0;
for (int i = 0; i < ndesc; i++)
{ if (desc[i] != 0)
{ printf ("Block %d: size = %ld\n", i+1, desc[i]->size());
flag = 1;
}
}
if (flag == 0)
printf ("No blocks allocated!\n");
}
//--------------------------------------------------------------------------
//
// Allocate block.
//
// Attempt to allocate a new block of a specified size and report the
// result.
//
void allocate ()
{
printf ("Enter block size: ");
long size;
scanf ("%ld", &size);
while (getchar() != '\n')
continue;
desc [ndesc++] = new XMS (size);
printf ("Block %d: ", ndesc);
printf ("requested %ld bytes, granted %ld bytes.\n",
size, desc[ndesc-1]->size());
if (!desc[ndesc-1]->valid())
delete desc[--ndesc];
}
//--------------------------------------------------------------------------
//
// Deallocate block.
//
// Attempt to deallocate an existing block and report the result.
//
void deallocate ()
{
printf ("Enter block number: ");
int b;
scanf ("%d", &b); b--;
while (getchar() != '\n')
continue;
if (b < 0 || b >= ndesc || desc[b] == 0)
printf ("No such block!\n");
else
{ delete desc[b];
desc[b] = 0;
printf ("Block %d deallocated.\n", b+1);
}
}
//--------------------------------------------------------------------------
//
// Copy to/from XMS.
//
// Prompts for a block number and a transfer size. An array of random
// numbers of the specified size is created in conventional memory,
// copied to the specified block starting at the specified offset,
// copied back to conventional memory, and finally compared with the
// original block.
//
void copy ()
{
printf ("Enter block number: ");
int b;
scanf ("%d", &b); b--;
while (getchar() != '\n')
continue;
if (b < 0 || b >= ndesc || desc[b] == 0)
{ printf ("No such block!\n");
return;
}
printf ("Enter transfer size: ");
unsigned s;
scanf ("%u", &s);
while (getchar() != '\n')
continue;
char* x = new char [s];
char* y = new char [s];
if (x == 0 || y == 0)
{ printf ("Not enough real memory!\n");
return;
}
printf ("Enter block offset: ");
long p;
scanf ("%ld", &p);
while (getchar() != '\n')
continue;
printf ("Copying %u bytes to/from XMS block %d, offset %ld.\n", s, b, p);
printf ("Generating random data... "); fflush (stdout);
randomize ();
for (unsigned i = 0; i < s; i++)
x[i] = random (256);
printf ("done.\n");
XMS::error r = XMS::copy (desc[b]->at(p), x, s);
printf ("Random data copied to XMS, result code %02X\n", int(r));
if (r == XMS::SUCCESS)
{ r = XMS::copy (y, desc[b]->at(p), s);
printf ("Data copied back from XMS, result code %02X\n", int(r));
if (r == XMS::SUCCESS)
{ for (i = 0; i < s; i++)
{ if (x[i] != y[i])
{ printf ("Verification error at offset %u.\n", i);
break;
}
}
if (i == s)
printf ("Copy verified successfully.\n");
}
}
delete x;
delete y;
}
//--------------------------------------------------------------------------
//
// Resize an existing block.
//
// Attempt to resize an existing XMS allocation and report the result.
//
void resize ()
{
printf ("Enter block number: ");
int b;
scanf ("%d", &b); b--;
while (getchar() != '\n')
continue;
if (b < 0 || b >= ndesc || desc[b] == 0)
{ printf ("No such block!\n");
return;
}
printf ("Current size: %ld\nEnter new size: ", desc[b]->size());
long size;
scanf ("%ld", &size);
while (getchar() != '\n')
continue;
XMS::error r = desc[b]->resize (size);
if (r == XMS::SUCCESS)
printf ("Requested %ld, granted %ld.\n", size, desc[b]->size());
else
printf ("Resize failed: error code = %02X\n", int(r));
}