84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
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/*_ page.h Mon May 1 1989 Modified by: Walter Bright */
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#ifndef __PAGE_H
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#define __PAGE_H 1
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#define PAGEOVERHEAD 10
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/*****************************************
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* Allocate a block of data and clear it.
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* Use:
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* unsigned page_calloc(void far *baseptr,unsigned size);
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* Returns:
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* offset of allocated data else 0
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*/
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unsigned cdecl page_calloc(void far *baseptr,unsigned size);
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/*****************************************
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* Allocate a block of data.
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* unsigned page_malloc(void far *baseptr,unsigned size);
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* Returns:
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* offset of allocated data else 0
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*/
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unsigned cdecl page_malloc(void far *baseptr,unsigned size);
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/*****************************************
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* Reallocate memory that was allocated by page_malloc() or page_calloc().
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* Use:
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* unsigned page_realloc(void far *baseptr,unsigned p, unsigned nbytes)
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* Returns:
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* 0 error
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* else offset of reallocated memory
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*/
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unsigned cdecl page_realloc(void far *baseptr,unsigned p, unsigned nbytes);
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/*****************************************
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* Free memory that was allocated by page_malloc() or page_calloc().
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* Use:
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* int page_free(void far *baseptr,unsigned p);
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* Returns:
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* 0 success
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* -1 error (baseptr is bad, or memory is corrupted)
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*/
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int cdecl page_free(void far *baseptr,unsigned p);
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/*****************************************
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* Determine size of largest free block in page.
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* unsigned page_maxfree(void far *baseptr);
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*/
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unsigned cdecl page_maxfree(void far *baseptr);
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/*****************************************
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* Initialize memory allocation system in a page.
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* unsigned page_initialize(void far *baseptr,unsigned pagesize);
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* Returns:
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* size of largest allocatable block
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*/
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unsigned cdecl page_initialize(void far *baseptr,unsigned pagesize);
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/*****************************************
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* Return number of bytes allocated for chunk of memory that was
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* allocated by page_malloc, page_calloc or page_realloc.
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*/
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/*unsigned cdecl page_size(void far *baseptr,unsigned p);*/
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#define page_size(baseptr,p) \
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(*(unsigned short far *)((char far *)(baseptr) + (p) - 2) - 2)
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/****************************************
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* Convert pointer to page and offset into that page into a void * pointer.
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*/
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/*void far * near page_toptr(void far *baseptr,unsigned p);*/
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#define page_toptr(baseptr,p) (void far *)((char far *)(baseptr) + (p))
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#endif /* __PAGE_H */
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