3 .ds ;G \\*(;G\\f\\$1\\$3\\f\\$2
4 .if !
\a\\$4
\a\a .Af \\$2 \\$1 "\\$4" "\\$5" "\\$6" "\\$7" "\\$8" "\\$9"
7 .ie
\a\\$3
\a\a .ft \\$1
11 .Af "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7" "\\$8" "\\$9"
16 .aF 5 \\n(.f "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"
19 .aF 5 1 "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"
22 .aF 1 5 "\\$1" "\\$2" "\\$3" "\\$4" "\\$5" "\\$6" "\\$7"
24 .de EX \" start example
41 hsort \- array heap sort
46 void strsort(char** \fIarray\fP, int \fIelements\fP, int (*\fIcompare\fP)(const char* \fIa\fP, const char* \fIb\fP));
50 does a heap sort on the array of pointers
54 elements using the comparison function
61 is lexicographically less than
72 is lexicographically greater than