lib/libc/sys-minix/sbrk.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3 #include <lib.h>
   4
   5 #include <unistd.h>
   6
   7 #ifdef __weak_alias
   8 __weak_alias(sbrk, _sbrk)
   9 #endif
  10
  11 extern char *_brksize;
  12
  13 void *sbrk(incr)
  14 intptr_t incr;
  15 {
  16   char *newsize, *oldsize;
  17
  18   oldsize = _brksize;
  19   newsize = _brksize + incr;
  20   if ((incr > 0 && newsize < oldsize) || (incr < 0 && newsize > oldsize))
  21         return( (char *) -1);
  22   if (brk(newsize) == 0)
  23         return(oldsize);
  24   else
  25         return( (char *) -1);
  26 }