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/*

 * Version of sbrk for no operating system.

 */

#include "config.h"

#include <_ansi.h>

#include <_syslist.h>

#include <sys/types.h>

#include <errno.h>

#undef errno

extern int errno;

caddr_t

_DEFUN (_sbrk, (incr),

        int incr)

{

   extern char end; /* set by linker */

   static char *heap_end;

   char *prev_heap_end;

   if (heap_end == 0) {

      heap_end = &end;

   }

   prev_heap_end = heap_end;

   heap_end += incr;

   return (caddr_t) prev_heap_end;

}