diff options
author | Siep Kroonenberg <siepo@cybercomm.nl> | 2011-02-17 16:52:23 +0000 |
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committer | Siep Kroonenberg <siepo@cybercomm.nl> | 2011-02-17 16:52:23 +0000 |
commit | 8da2d23733595367fad869e5fbc6c9a87041879b (patch) | |
tree | 0f3719f4eea97f872b6347c6d9ff5aa2ccd38299 /Master/tlpkg/tlperl/lib/look.pl | |
parent | 9d55a4cf517a832c74e85179eac4239f9be8d2e7 (diff) |
New tlperl part VIII
git-svn-id: svn://tug.org/texlive/trunk@21430 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/tlpkg/tlperl/lib/look.pl')
-rw-r--r-- | Master/tlpkg/tlperl/lib/look.pl | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/look.pl b/Master/tlpkg/tlperl/lib/look.pl new file mode 100644 index 00000000000..f2a4e09dd6b --- /dev/null +++ b/Master/tlpkg/tlperl/lib/look.pl @@ -0,0 +1,52 @@ +;# Usage: &look(*FILEHANDLE,$key,$dict,$fold) +# +# This library is no longer being maintained, and is included for backward +# compatibility with Perl 4 programs which may require it. +# This legacy library is deprecated and will be removed in a future +# release of perl. +# +# In particular, this should not be used as an example of modern Perl +# programming techniques. + +;# Sets file position in FILEHANDLE to be first line greater than or equal +;# (stringwise) to $key. Pass flags for dictionary order and case folding. + +sub look { + local(*FH,$key,$dict,$fold) = @_; + local($max,$min,$mid,$_); + local($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime, + $blksize,$blocks) = stat(FH); + $blksize = 8192 unless $blksize; + $key =~ s/[^\w\s]//g if $dict; + $key = lc $key if $fold; + $max = int($size / $blksize); + while ($max - $min > 1) { + $mid = int(($max + $min) / 2); + seek(FH,$mid * $blksize,0); + $_ = <FH> if $mid; # probably a partial line + $_ = <FH>; + chop; + s/[^\w\s]//g if $dict; + $_ = lc $_ if $fold; + if ($_ lt $key) { + $min = $mid; + } + else { + $max = $mid; + } + } + $min *= $blksize; + seek(FH,$min,0); + <FH> if $min; + while (<FH>) { + chop; + s/[^\w\s]//g if $dict; + $_ = lc $_ if $fold; + last if $_ ge $key; + $min = tell(FH); + } + seek(FH,$min,0); + $min; +} + +1; |