-
/*
-
- Copyright 1994 Alec Russell, ALL rights reserved
- Permission granted to use as you wish.
-
+ Written by Alexander J. Russell 1994
+
+ Placed in the public Domain by Alec Russell, March 1995
+
Slightly higher level xms calls than xmem.asm
-
+
*/
-
+
#include <stdio.h>
#include <io.h>
#include <string.h>
#include <malloc.h>
-
-#include <xmem.h>
-
+
+#include "src\lib\exmm\xmem.h"
+
xms_head_t xms_head={0}; // set handle to zero
-
-
+
+
/* ---------------------- alloc_xms() ----------------- February 19,1994 */
short alloc_xms(unsigned short far *size) // size in 16k blocks
{
return(XMS_alloc(0, size));
}
-
+
+
+
/* ---------------------- xms_to_mem() ---------------- February 19,1994 */
-short xms_to_mem(unsigned short handle, void far *p, unsigned long off, unsigned short n)
+short xms_to_mem(unsigned short handle, void far *p, unsigned long off,
+unsigned short n)
{
unsigned short block, boff;
-
+
block=off >> XMSBLOCKSHIFT;
boff=off - (block << XMSBLOCKSHIFT);
-
+
return(XMStoMem(handle, block, boff, n, p));
}
-
+
+
/* ---------------------- mem_to_xms() ---------------- February 19,1994 */
-short mem_to_xms(unsigned short handle, void far *p, unsigned long off, unsigned short n)
+short mem_to_xms(unsigned short handle, void far *p, unsigned long off,
+unsigned short n)
{
unsigned short block, boff;
-
+
block=off >> XMSBLOCKSHIFT;
boff=off - (block << XMSBLOCKSHIFT);
-
+
return(MemToXMS(handle, block, boff, n, p));
}
-
+
+
/* ---------------------- qalloc_xms() -------------------- March 8,1994 */
xms_node_t *qalloc_xms(unsigned long size)
{
xms_node_t *node=NULL;
xms_node_t *t1;
-
+
if ( size <= xms_head.avail )
{
// look for existing node
else
t1=t1->next;
}
-
+
if ( node == NULL ) // didn't find existing node
{
node=malloc(sizeof(xms_node_t));
}
}
else
- pr2("out of near mem in qalloc_xms");
+ printf("out of near mem in qalloc_xms");
}
}
else
- pr2("out of xms mem in qalloc size %lu avail %lu", size, xms_head.avail);
-
+ printf("out of xms mem in qalloc size %lu avail %lu", size,
+xms_head.avail);
+
return(node);
}
-
+
+
/* ---------------------- qfree_xms() --------------------- March 8,1994 */
void qfree_xms(xms_node_t *node)
{
xms_node_t *t1;
-
+
if ( xms_head.next )
{
t1=xms_head.next;
while ( t1 != node && t1 )
t1=t1->next;
-
+
if ( t1 )
{
t1->used=0;
}
else
- pr2("ERROR didn't find node qfree");
+ printf("ERROR didn't find node qfree");
}
else
{
- pr2("ATTEMPTED to qfree empty list");
+ printf("ATTEMPTED to qfree empty list");
}
}
-
+
+
+
/* ---------------------- xms_open() ---------------------- March 8,1994 */
xms_node_t *xms_open(char *file)
{
FILE *fp;
char *buffer;
unsigned long off;
-
+
fp=fopen(file, "rb");
if ( fp )
{
off=0l;
while ( (i=fread(buffer, 1, 4096, fp)) )
{
- mem_to_xms(xms_head.handle, (char far *)buffer, off+node->start, i);
+ mem_to_xms(xms_head.handle, (char far *)buffer,
+off+node->start, i);
off+=i;
}
-
+
free(buffer);
}
else
- pr2("out of mem in xms_open 1");
+ printf("out of mem in xms_open 1");
}
-
+
fclose(fp);
}
else
- pr2("ERROR opening %s in xms_open", file);
-
+ printf("ERROR opening %s in xms_open", file);
+
return(node);
}
-
+
+
/* ---------------------- xms_read() ---------------------- March 8,1994 */
short xms_read(void far *buffer, unsigned short n, xms_node_t *node)
{
-
+
if ( node->off >= node->size )
return 0;
-
+
if ( n+node->off > node->size )
n=node->size - node->off;
-
+
xms_to_mem(xms_head.handle, buffer, node->start+node->off, n);
node->off+=n;
-
+
return(n);
}
-
+
+
/* ---------------------- xms_write() ---------------------- March 8,1994 */
short xms_write(void far *buffer, unsigned short n, xms_node_t *node)
{
-
+
if ( node->off >= node->size )
return 0;
-
+
if ( n+node->off > node->size )
n=node->size - node->off;
-
+
mem_to_xms(xms_head.handle, buffer, node->start+node->off, n);
node->off+=n;
-
+
return(n);
}
-
-
+
+
/* ---------------------- xms_tell() ---------------------- March 8,1994 */
long xms_tell(xms_node_t *node)
{
return node->off;
}
-
+
+
+
/* ---------------------- xms_seek() ---------------------- March 8,1994 */
short xms_seek(xms_node_t *node, long off, short whence)
{
short err=0;
-
+
switch ( whence )
{
case SEEK_SET:
else
node->off=off;
break;
-
+
case SEEK_END:
if ( off > 0l || (node->size + off) < 0l )
err=1;
else
node->off=node->size + off;
break;
-
+
case SEEK_CUR:
if ( node->off + off < 0l || node->off + off > node->size )
err=1;
node->off+=off;
break;
}
-
+
return(err);
}
-
+
+
/* ---------------------- xms_close() --------------------- March 8,1994 */
void xms_close(xms_node_t *node)
{
qfree_xms(node);
}
-
+
+
+
+
/* ---------------------- init_xms() ---------------------- March 8,1994 */
short init_xms(unsigned short min_blocks)
{
unsigned short blocks;
-
+
blocks=XMSblk_available();
if ( blocks >= min_blocks )
{
memset(&xms_head, 0, sizeof(xms_head_t));
if ( (xms_head.handle=alloc_xms(&blocks)) )
{
- pr2("blocks minus by = %u", blocks);
+ printf("blocks minus by = %u", blocks);
min_blocks-=blocks;
xms_head.avail=xms_head.total=(unsigned long)min_blocks*XMSBLOCK;
blocks=min_blocks;
}
else
blocks=0;
-
+
return(blocks);
}
-
+
+
/* ---------------------- deinit_xms() -------------------- March 8,1994 */
void deinit_xms(void)
{
xms_node_t *t1, *t2;
-
+
if ( xms_head.handle )
{
XMS_dealloc(xms_head.handle);
t2=t1->next;
}
}
-
+
memset(&xms_head, 0, sizeof(xms_head_t));
}
}
+
+
+
/* --------------------------- end of file ------------------------- */
-/*
-
-Not sure how to use this?
-
-call init_xms(x) to allocate a big chunk of xms.
-x is in 'blocks' of 16Kb. Pick X big enough to buffer all the files
-you want to place in xms.
-
-call xms_open("filename); for each file to be buffered. This copies the file
-int xms.
-
-then use xms_read(), xms_write(), and xms_seek() to read the file from
-xms instead of disk.
-
-call deinit_xms() just before exit to clean up.
-
-You can also use the lower level calls directly.
-
+/*\r
+\r
+Not sure how to use this?\r
+\r
+call init_xms(x) to allocate a big chunk of xms.\r
+x is in 'blocks' of 16Kb. Pick X big enough to buffer all the files\r
+you want to place in xms.\r
+\r
+call xms_open("filename); for each file to be buffered. This copies the file\r
+int xms.\r
+\r
+then use xms_read(), xms_write(), and xms_seek() to read the file from\r
+xms instead of disk.\r
+\r
+call deinit_xms() just before exit to clean up.\r
+\r
+You can also use the lower level calls directly.\r
+\r
*/
projects / 16.git / blobdiff