newlib/libc/sys/h8300hms/sbrk.c

   1 #include <_ansi.h>
   2 #include <sys/types.h>
   3 #include <sys/stat.h>
   4 #include <stdlib.h>
   5
   6 register char *stack_ptr asm ("sp");
   7 extern int _write (int, char *, int);
   8
   9 caddr_t
  10   _sbrk(incr)
  11      int incr;
  12 {
  13   extern char end;              /* Defined by the linker */
  14   static char *heap_end;
  15   char *prev_heap_end;
  16
  17   if (heap_end == 0)
  18     {
  19       heap_end = &end;
  20     }
  21   prev_heap_end = heap_end;
  22   if (heap_end + incr > stack_ptr)
  23     {
  24       _write (1, "Heap and stack collision\n", 25);
  25       abort ();
  26     }
  27   heap_end += incr;
  28   return (caddr_t)prev_heap_end;
  29 }
  30