lib/other/_sbrk.c

   1 #include <lib.h>
   2 #define sbrk    _sbrk
   3 #include <unistd.h>
   4
   5 extern char *_brksize;
   6
   7 PUBLIC char *sbrk(incr)
   8 int incr;
   9 {
  10   char *newsize, *oldsize;
  11
  12   oldsize = _brksize;
  13   newsize = _brksize + incr;
  14   if ((incr > 0 && newsize < oldsize) || (incr < 0 && newsize > oldsize))
  15         return( (char *) -1);
  16   if (brk(newsize) == 0)
  17         return(oldsize);
  18   else
  19         return( (char *) -1);
  20 }