Category : C Source Code
Archive   : HEAPMAN.ZIP
Filename : INITHEAP.C

 
Output of file : INITHEAP.C contained in archive : HEAPMAN.ZIP
#include
#include "mm.h"

long gMPTsize = ZERO,
*gTableSizeCountAdrs = NIL,
*gTopOfHeap = NIL;



InitHeap(BlockSize, TableSize)
long BlockSize, TableSize;

/*
Allocates and initializes the heap. Moreover, it also sets up the
Master Pointer Table (MPT) to the size specified by TableSize. Note:
table size must be a power of 2 or else it rets an error.

calling params:
heap size
number of handles in MPT

return params:
err | noErr
Author: Byro
Creation: 01/11/91
Modified: 01/21/91
Revision:

*/

{
char *theBlk = NIL; /* needed by mac 2 alloc non reloc blk */
unsigned long myTemp; /* used 2 avoid errs during computing adrses */

if (((TableSize +1) * BYTE_OFFSET) > BlockSize)
return(INIT_HEAP); /* err, not enough space */

if (IsEven(TableSize) == FALSE)
return(INIT_HEAP);

gMPTsize = TableSize;

theBlk = malloc((unsigned int) BlockSize);
gTableSizeCountAdrs = (long *) theBlk;

if (theBlk == NIL)
return(INIT_HEAP);

myTemp = (unsigned long) gTableSizeCountAdrs + (unsigned long) BlockSize;
gTopOfHeap = (long *) myTemp;

/* clr mpt table which consists of n + 1 elements */

ZeroStruct((char *) gTableSizeCountAdrs, (int) (gMPTsize + 1) * BYTE_OFFSET);

/* set mpt table count size */

*gTableSizeCountAdrs = gMPTsize;

return(NO_ERR); /* successs! */
}


  3 Responses to “Category : C Source Code
Archive   : HEAPMAN.ZIP
Filename : INITHEAP.C
”

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    January 27, 2013 at 3:59 pm

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