37 lines
678 B
C
37 lines
678 B
C
#include <_ansi.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "sys/syscall.h"
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int errno;
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int __trap0 (int function, int p1, int p2, int p3);
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#define TRAP0(f, p1, p2, p3) __trap0(f, (int)(p1), (int)(p2), (int)(p3))
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caddr_t
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_sbrk (int incr)
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{
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extern char end; /* Defined by the linker */
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static char *heap_end;
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char *prev_heap_end;
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#if 0
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char *sp = (char *)stack_ptr;
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#else
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char *sp = (char *)&sp;
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#endif
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if (heap_end == 0)
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{
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heap_end = &end;
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}
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prev_heap_end = heap_end;
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if (heap_end + incr > sp)
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{
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_write (1, "Heap and stack collision\n", 25);
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abort ();
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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