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 setblock()              Modify Size of MS-DOS Memory Segment

 #include   <dos.h>

 int        setblock(seg,newsize);
 unsigned   seg;                         Segment address
 unsigned   newsize;                     New size in paragraphs

    setblock() changes the size of a DOS memory segment, basing the
    change on the segment address ('seg') returned by an earlier call to
    allocmem() and the size, in paragraphs, specified by 'newsize'.

       Returns:     -1, if successful.  On error, the size of the largest
                    possible block is returned, '_doserrno' is set, and
                    'errno' is set to ENOMEM (not enough memory).

   Portability:     MS-DOS only.