8 # Usage: look(*FILEHANDLE,$key,$dict,$fold)
10 # Sets file position in FILEHANDLE to be first line greater than or equal
11 # (stringwise) to $key. Pass flags for dictionary order and case folding.
14 local(*FH,$key,$dict,$fold) = @_;
15 local($max,$min,$mid,$_);
16 local($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,
17 $blksize,$blocks) = stat(FH);
18 $blksize = 8192 unless $blksize;
19 $key =~ s/[^\w\s]//g if $dict;
20 $key =~ tr/A-Z/a-z/ if $fold;
21 $max = int($size / $blksize);
22 while ($max - $min > 1) {
23 $mid = int(($max + $min) / 2);
24 seek(FH,$mid * $blksize,0);
25 $_ = <FH> if $mid; # probably a partial line
28 s/[^\w\s]//g if $dict;
42 s/[^\w\s]//g if $dict;