newlib-cygwin/newlib/libc/sys/h8300hms/sbrk.c

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2000-02-18 03:39:52 +08:00
#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
register char *stack_ptr asm ("sp");
caddr_t
_sbrk(incr)
int incr;
{
extern char end; /* Defined by the linker */
static char *heap_end;
char *prev_heap_end;
if (heap_end == 0)
{
heap_end = &end;
}
prev_heap_end = heap_end;
if (heap_end + incr > stack_ptr)
{
_write (1, "Heap and stack collision\n", 25);
abort ();
}
heap_end += incr;
return (caddr_t)prev_heap_end;
}