toolchain/gcc/libgloss/iq2000/sbrk.c

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