COMPAR(III) 1/15/73 COMPAR(III)
NAME
compar - default comparison routine for qsort
SYNOPSIS
jsr pc,compar
DESCRIPTION
Compar is the default comparison routine called by qsort and
is separated out so that the user can supply his own
comparison.
The routine is called with the width (in bytes) of an
element in r3 and it compares byte-by-byte the element
pointed to by r0 with the element pointed to by r4.
Return is via the condition codes, which are tested by the
instructions ``blt'' and ``bgt''. That is, in the absence
of overflow, the condition (r0) < (r4) should leave the Z-
bit off and N-bit on while (r0) > (r4) should leave Z and N
off. Still another way of putting it is that for elements
of length 1 the instruction
cmpb (r0),(r4)
suffices.
Only r0 is changed by the call.
SEE ALSO
qsort (III)
BUGS
It could be recoded to run faster.