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usr/src/linux-headers-5.4.0-200-generic/scripts/cleanpatch 0000755 00000012076 14722073035 0017017 0 ustar 00 #!/usr/bin/env perl # SPDX-License-Identifier: GPL-2.0 # # Clean a patch file -- or directory of patch files -- of stealth whitespace. # WARNING: this can be a highly destructive operation. Use with caution. # use warnings; use bytes; use File::Basename; # Default options $max_width = 79; # Clean up space-tab sequences, either by removing spaces or # replacing them with tabs. sub clean_space_tabs($) { no bytes; # Tab alignment depends on characters my($li) = @_; my($lo) = ''; my $pos = 0; my $nsp = 0; my($i, $c); for ($i = 0; $i < length($li); $i++) { $c = substr($li, $i, 1); if ($c eq "\t") { my $npos = ($pos+$nsp+8) & ~7; my $ntab = ($npos >> 3) - ($pos >> 3); $lo .= "\t" x $ntab; $pos = $npos; $nsp = 0; } elsif ($c eq "\n" || $c eq "\r") { $lo .= " " x $nsp; $pos += $nsp; $nsp = 0; $lo .= $c; $pos = 0; } elsif ($c eq " ") { $nsp++; } else { $lo .= " " x $nsp; $pos += $nsp; $nsp = 0; $lo .= $c; $pos++; } } $lo .= " " x $nsp; return $lo; } # Compute the visual width of a string sub strwidth($) { no bytes; # Tab alignment depends on characters my($li) = @_; my($c, $i); my $pos = 0; my $mlen = 0; for ($i = 0; $i < length($li); $i++) { $c = substr($li,$i,1); if ($c eq "\t") { $pos = ($pos+8) & ~7; } elsif ($c eq "\n") { $mlen = $pos if ($pos > $mlen); $pos = 0; } else { $pos++; } } $mlen = $pos if ($pos > $mlen); return $mlen; } $name = basename($0); @files = (); while (defined($a = shift(@ARGV))) { if ($a =~ /^-/) { if ($a eq '-width' || $a eq '-w') { $max_width = shift(@ARGV)+0; } else { print STDERR "Usage: $name [-width #] files...\n"; exit 1; } } else { push(@files, $a); } } foreach $f ( @files ) { print STDERR "$name: $f\n"; if (! -f $f) { print STDERR "$f: not a file\n"; next; } if (!open(FILE, '+<', $f)) { print STDERR "$name: Cannot open file: $f: $!\n"; next; } binmode FILE; # First, verify that it is not a binary file; consider any file # with a zero byte to be a binary file. Is there any better, or # additional, heuristic that should be applied? $is_binary = 0; while (read(FILE, $data, 65536) > 0) { if ($data =~ /\0/) { $is_binary = 1; last; } } if ($is_binary) { print STDERR "$name: $f: binary file\n"; next; } seek(FILE, 0, 0); $in_bytes = 0; $out_bytes = 0; $lineno = 0; @lines = (); $in_hunk = 0; $err = 0; while ( defined($line = <FILE>) ) { $lineno++; $in_bytes += length($line); if (!$in_hunk) { if ($line =~ /^\@\@\s+\-([0-9]+),([0-9]+)\s+\+([0-9]+),([0-9]+)\s\@\@/) { $minus_lines = $2; $plus_lines = $4; if ($minus_lines || $plus_lines) { $in_hunk = 1; @hunk_lines = ($line); } } else { push(@lines, $line); $out_bytes += length($line); } } else { # We're in a hunk if ($line =~ /^\+/) { $plus_lines--; $text = substr($line, 1); $text =~ s/[ \t\r]*$//; # Remove trailing spaces $text = clean_space_tabs($text); $l_width = strwidth($text); if ($max_width && $l_width > $max_width) { print STDERR "$f:$lineno: adds line exceeds $max_width ", "characters ($l_width)\n"; } push(@hunk_lines, '+'.$text); } elsif ($line =~ /^\-/) { $minus_lines--; push(@hunk_lines, $line); } elsif ($line =~ /^ /) { $plus_lines--; $minus_lines--; push(@hunk_lines, $line); } else { print STDERR "$name: $f: malformed patch\n"; $err = 1; last; } if ($plus_lines < 0 || $minus_lines < 0) { print STDERR "$name: $f: malformed patch\n"; $err = 1; last; } elsif ($plus_lines == 0 && $minus_lines == 0) { # End of a hunk. Process this hunk. my $i; my $l; my @h = (); my $adj = 0; my $done = 0; for ($i = scalar(@hunk_lines)-1; $i > 0; $i--) { $l = $hunk_lines[$i]; if (!$done && $l eq "+\n") { $adj++; # Skip this line } elsif ($l =~ /^[ +]/) { $done = 1; unshift(@h, $l); } else { unshift(@h, $l); } } $l = $hunk_lines[0]; # Hunk header undef @hunk_lines; # Free memory if ($adj) { die unless ($l =~ /^\@\@\s+\-([0-9]+),([0-9]+)\s+\+([0-9]+),([0-9]+)\s\@\@(.*)$/); my $mstart = $1; my $mlin = $2; my $pstart = $3; my $plin = $4; my $tail = $5; # doesn't include the final newline $l = sprintf("@@ -%d,%d +%d,%d @@%s\n", $mstart, $mlin, $pstart, $plin-$adj, $tail); } unshift(@h, $l); # Transfer to the output array foreach $l (@h) { $out_bytes += length($l); push(@lines, $l); } $in_hunk = 0; } } } if ($in_hunk) { print STDERR "$name: $f: malformed patch\n"; $err = 1; } if (!$err) { if ($in_bytes != $out_bytes) { # Only write to the file if changed seek(FILE, 0, 0); print FILE @lines; if ( !defined($where = tell(FILE)) || !truncate(FILE, $where) ) { die "$name: Failed to truncate modified file: $f: $!\n"; } } } close(FILE); }
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