1 #!/usr/bin/env perl 1 #!/usr/bin/env perl
2 # SPDX-License-Identifier: GPL-2.0 2 # SPDX-License-Identifier: GPL-2.0
3 # Prefix all lines with "# ", unbuffered. Comm 3 # Prefix all lines with "# ", unbuffered. Command being piped in may need
4 # to have unbuffering forced with "stdbuf -i0 4 # to have unbuffering forced with "stdbuf -i0 -o0 -e0 $cmd".
5 use strict; 5 use strict;
6 use IO::Handle; 6 use IO::Handle;
7 7
8 binmode STDIN; 8 binmode STDIN;
9 binmode STDOUT; 9 binmode STDOUT;
10 10
11 STDOUT->autoflush(1); 11 STDOUT->autoflush(1);
12 12
13 my $needed = 1; 13 my $needed = 1;
14 while (1) { 14 while (1) {
15 my $char; 15 my $char;
16 my $bytes = sysread(STDIN, $char, 1); 16 my $bytes = sysread(STDIN, $char, 1);
17 exit 0 if ($bytes == 0); 17 exit 0 if ($bytes == 0);
18 if ($needed) { 18 if ($needed) {
19 print "# "; 19 print "# ";
20 $needed = 0; 20 $needed = 0;
21 } 21 }
22 print $char; 22 print $char;
23 $needed = 1 if ($char eq "\n"); 23 $needed = 1 if ($char eq "\n");
24 } 24 }
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