Generated: Sat Oct 24 16:35:29 2020 from shwoffset.pl 2018/04/14 9.4 KB. text copy
#!/usr/bin/perl -w # NAME: shwoffset.pl # AIM: Given a file and an offset, show line with that offset # 2018-04-14 - Try to fix an 'uninitialized value $tmp' # 20150108 - Limit output unless -v5 # 01/03/2014 geoff mclane http://geoffair.net/mperl use strict; use warnings; use File::Basename; # split path ($name,$dir,$ext) = fileparse($file [, qr/\.[^.]*/] ) use Cwd; my $os = $^O; my $perl_dir = '/home/geoff/bin'; my $PATH_SEP = '/'; my $temp_dir = '/tmp'; if ($os =~ /win/i) { $perl_dir = 'C:\GTools\perl'; $temp_dir = $perl_dir; $PATH_SEP = "\\"; } unshift(@INC, $perl_dir); require 'lib_utils.pl' or die "Unable to load 'lib_utils.pl' Check paths in \@INC...\n"; # log file stuff our ($LF); my $pgmname = $0; if ($pgmname =~ /(\\|\/)/) { my @tmpsp = split(/(\\|\/)/,$pgmname); $pgmname = $tmpsp[-1]; } my $outfile = $temp_dir.$PATH_SEP."temp.$pgmname.txt"; open_log($outfile); # user variables my $VERS = "0.0.2 2014-03-01"; my $load_log = 0; my $in_file = ''; my $verbosity = 0; my $out_file = ''; my $offset = -1; my $def_span = 32; # ### DEBUG ### my $debug_on = 0; my $def_file = 'def_file'; ### program variables my @warnings = (); my $cwd = cwd(); sub VERB1() { return $verbosity >= 1; } sub VERB2() { return $verbosity >= 2; } sub VERB5() { return $verbosity >= 5; } sub VERB9() { return $verbosity >= 9; } sub show_warnings($) { my ($val) = @_; if (@warnings) { prt( "\nGot ".scalar @warnings." WARNINGS...\n" ); foreach my $itm (@warnings) { prt("$itm\n"); } prt("\n"); } else { prt( "\nNo warnings issued.\n\n" ) if (VERB9()); } } sub pgm_exit($$) { my ($val,$msg) = @_; if (length($msg)) { $msg .= "\n" if (!($msg =~ /\n$/)); prt($msg); } show_warnings($val); close_log($outfile,$load_log); exit($val); } sub prtw($) { my ($tx) = shift; $tx =~ s/\n$//; prt("$tx\n"); push(@warnings,$tx); } sub process_in_file($) { my ($inf) = @_; if (! open INF, "<$inf") { pgm_exit(1,"ERROR: Unable to open file [$inf]\n"); } my @lines = <INF>; close INF; my $lncnt = scalar @lines; prt("Processing $lncnt lines, from [$inf], up to offet $offset...\n"); my ($i,$line,$inc,$lnn,$len,$tmp,$skip,$tlen1,$tlen2,$tlen,$rem); $lnn = 0; my $total_len = 0; my $prev_tot = 0; for ($i = 0; $i < $lncnt; $i++) { $line = $lines[$i]; $len = length($line); $prev_tot = $total_len; $total_len += $len; chomp $line; $lnn++; if ($total_len >= $offset) { if (VERB9()) { if ($i > 4) { $tmp = $lines[$i-5]; chomp $tmp; prt(($i - 4).": $tmp\n"); } } if (VERB5()) { if ($i > 3) { $tmp = $lines[$i-4]; chomp $tmp; prt(($i - 3).": $tmp\n"); } } if (VERB2()) { if ($i > 2) { $tmp = $lines[$i-3]; chomp $tmp; prt(($i - 2).": $tmp\n"); } } if (VERB1()) { if ($i > 1) { $tmp = $lines[$i-2]; chomp $tmp; prt(($i - 1).": $tmp\n"); } } if ($i) { $tmp = $lines[$i-1]; chomp $tmp; prt("$i: $tmp\n"); } ################################################ # the line containing this offset if (VERB5()) { # whow WHOLE line prt("$lnn> $line\n"); } else { # show only around the OFFSET # offset is after $prev_tot, and before or at $total_len $len = length($line); $tlen1 = $total_len - $offset; if ($tlen1 > $def_span) { $tlen1 = $def_span; } $tlen2 = $offset - $prev_tot; if ($tlen2 > $def_span) { $tlen2 = $def_span; } $tlen = $tlen1 + $tlen2; $skip = $offset - $tlen2; $tmp = substr($line,$skip,$tlen); prt("Offset $offset prev $prev_tot next $total_len substr $skip,$tlen\n"); prt("$lnn> $tmp\n"); $tmp = ' ' x ($tlen2-1); $tmp .= '^'; prt("$lnn> $tmp\n"); } if (($i + 1) < $lncnt) { $tmp = $lines[$i+1]; chomp $tmp; prt(($i+2).": $tmp\n"); } if (VERB1()) { if (($i + 2) < $lncnt) { $tmp = $lines[$i+2]; chomp $tmp; prt(($i+3).": $tmp\n"); } } if (VERB2()) { if (($i + 3) < $lncnt) { $tmp = $lines[$i+3]; chomp $tmp; prt(($i+4).": $tmp\n"); } } if (VERB5()) { if (($i + 4) < $lncnt) { $tmp = $lines[$i+4]; chomp $tmp; prt(($i+5).": $tmp\n"); } } if (VERB9()) { if (($i + 5) < $lncnt) { $tmp = $lines[$i+5]; chomp $tmp; prt(($i+6).": $tmp\n"); } } last; } } } ######################################### ### MAIN ### parse_args(@ARGV); process_in_file($in_file); pgm_exit(0,""); ######################################## sub need_arg { my ($arg,@av) = @_; pgm_exit(1,"ERROR: [$arg] must have a following argument!\n") if (!@av); } sub parse_args { my (@av) = @_; my ($arg,$sarg,$cnt); my $verb = VERB2(); $cnt = 0; while (@av) { $arg = $av[0]; if ($arg =~ /^-/) { $sarg = substr($arg,1); $sarg = substr($sarg,1) while ($sarg =~ /^-/); if (($sarg =~ /^h/i)||($sarg eq '?')) { give_help(); pgm_exit(0,"Help exit(0)"); } elsif ($sarg =~ /^v/) { if ($sarg =~ /^v.*(\d+)$/) { $verbosity = $1; } else { while ($sarg =~ /^v/) { $verbosity++; $sarg = substr($sarg,1); } } $verb = VERB2(); prt("Verbosity = $verbosity\n") if ($verb); } elsif ($sarg =~ /^l/) { if ($sarg =~ /^ll/) { $load_log = 2; } else { $load_log = 1; } prt("Set to load log at end. ($load_log)\n") if ($verb); } elsif ($sarg =~ /^o/) { need_arg(@av); shift @av; $sarg = $av[0]; $out_file = $sarg; prt("Set out file to [$out_file].\n") if ($verb); } else { pgm_exit(1,"ERROR: Invalid argument [$arg]! Try -?\n"); } } else { if ($cnt == 0) { $in_file = $arg; if (-f $in_file) { prt("Set input to [$in_file]\n") if ($verb); } else { pgm_exit(1,"Command error! Expect first bear argument to be a valid file.\nFile [$in_file] NOT found.\n"); } } elsif ($cnt == 1) { $offset = $arg; if ($offset =~ /^\d+$/) { prt("Set offset to [$offset]\n") if ($verb); } else { pgm_exit(1,"Command error! Expected integer offset and 2nd bare argument, not [$arg]\n"); } } else { pgm_exit(1,"Command error! Already have file [$in_file], and offset [$offset]!\nWhat is this [$arg]\n"); } $cnt++; } shift @av; } if ($debug_on) { prtw("WARNING: DEBUG is ON!\n"); if (length($in_file) == 0) { $in_file = $def_file; prt("Set DEFAULT input to [$in_file]\n"); } } if (length($in_file) == 0) { pgm_exit(1,"ERROR: No input files found in command! Try -?\n"); } if ($offset == -1) { pgm_exit(1,"ERROR: No offset found in command! Try -?\n"); } if ($offset >= 0) { } else { pgm_exit(1,"ERROR: Bad offset [$offset]! Must be 0 to 99999999999! Try -?\n"); } if (! -f $in_file) { pgm_exit(1,"ERROR: Unable to find in file [$in_file]! Check name, location...\n"); } } sub give_help { prt("$pgmname: version $VERS\n"); prt("Usage: $pgmname [options] in-file offset\n"); prt("Options:\n"); prt(" --help (-h or -?) = This help, and exit 0.\n"); prt(" --verb[n] (-v) = Bump [or set] verbosity. def=$verbosity\n"); prt(" --load (-l) = Load LOG at end. ($outfile)\n"); prt(" --out <file> (-o) = Write output to this file.\n"); } # eof - template.pl