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61 lines
1.3 KiB
61 lines
1.3 KiB
unsigned int global_heap_start = 0;
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unsigned int global_heap_end = 0;
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unsigned int global_heap_next = 0;
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void* malloc(num_bytes);
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void* calloc(number_elements, size);
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int set_heap_settings(param_start, param_end);
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unsigned int get_heap_next();
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void* malloc(num_bytes)
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int num_bytes;
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{
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unsigned int allocated_pointer = global_heap_next;
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global_heap_next = global_heap_next + num_bytes;
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if (global_heap_next > global_heap_end)
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{
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return 0; /* No more memory */
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}
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return allocated_pointer;
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}
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void* calloc(number_elements, size)
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unsigned int number_elements;
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unsigned int size;
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{
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int i;
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char* temp_pointer;
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unsigned int num_bytes = number_elements * size;
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void* allocated_pointer = global_heap_next;
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global_heap_next = global_heap_next + num_bytes;
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if (global_heap_next > global_heap_end)
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{
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return 0; /* No more memory */
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}
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/* Since this is calloc, we set the memory to zero */
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temp_pointer = allocated_pointer;
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for (i = 0; i < num_bytes; ++i)
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{
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*temp_pointer = 0;
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temp_pointer++;
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}
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return allocated_pointer;
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}
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int set_heap_settings(param_start, param_end)
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unsigned int param_start;
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unsigned int param_end;
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{
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global_heap_start = param_start;
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global_heap_next = param_start;
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global_heap_end = param_end;
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return 0;
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}
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unsigned int get_heap_next()
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{
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return global_heap_next;
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}
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