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SBRK.C
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C/C++ Source or Header
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1994-10-13
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563b
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29 lines
#include <sys/emx.h>
#include <errno.h>
extern unsigned long _sys_heap_begin;
extern unsigned long _sys_heap_end;
void * __sbrk (int incr)
{
static int inited = 0;
static int _brk_left;
static int _brk_val;
void *retv;
if (!inited) {
_brk_val = _sys_heap_begin;
_brk_left = _sys_heap_end - _sys_heap_begin;
inited = 1;
}
if ((incr > _brk_left) || (_brk_val + incr > _sys_heap_end))
return ((void *)-1);
retv = (void *) _brk_val;
_brk_val += incr;
_brk_left -= incr;
return retv;
}