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Diffstat (limited to 'static/v10/man3/compar.3')
| -rw-r--r-- | static/v10/man3/compar.3 | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/static/v10/man3/compar.3 b/static/v10/man3/compar.3 new file mode 100644 index 00000000..3fc488d5 --- /dev/null +++ b/static/v10/man3/compar.3 @@ -0,0 +1,43 @@ +.pa 1 +.he 'COMPAR (III)'1/15/73'COMPAR (III)' +.ti 0 +NAME compar -- default comparison routine for qsort +.sp +.ti 0 +SYNOPSIS jsr pc,compar +.sp +.ti 0 +DESCRIPTION Compar is the default comparison routine +called by qsort and is separated out so that the user can +supply his own comparison. +.sp +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. +.sp +Return is via the condition codes, +which are tested by the instructions "blt" and "bgt". +.a +That is, in the absence of overflow, then 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. +.sp +Only r0 is changed by the call. +.sp +.ti 0 +FILES kept in /lib/liba.a +.sp +.ti 0 +SEE ALSO qsort (III) +.sp +.ti 0 +DIAGNOSTICS -- +.sp +.ti 0 +BUGS It could be recoded to run faster. |