scriptreplay: rewrite in C
The dependence on Perl sucks... Co-Author: James Youngman <jay@gnu.org> Signed-off-by: Karel Zak <kzak@redhat.com> Signed-off-by: James Youngman <jay@gnu.org>
This commit is contained in:
Karel Zak
parent
e687632e57
commit
18a706bdfd
|
|
@ -693,7 +693,6 @@ tests/Makefile
|
|||
tests/helpers/Makefile
|
||||
tests/commands.sh
|
||||
misc-utils/chkdupexe:misc-utils/chkdupexe.pl
|
||||
misc-utils/scriptreplay:misc-utils/scriptreplay.pl
|
||||
])
|
||||
|
||||
AC_OUTPUT
|
||||
|
|
|
|||
|
|
@ -5,14 +5,14 @@ EXTRA_DIST = README.flushb
|
|||
bin_PROGRAMS =
|
||||
|
||||
usrbinexec_PROGRAMS = cal ddate logger look mcookie \
|
||||
namei script whereis
|
||||
namei script whereis scriptreplay
|
||||
EXTRA_DIST += README.cal README.ddate README.namei README.namei2
|
||||
|
||||
mcookie_SOURCES = mcookie.c ../lib/md5.c
|
||||
|
||||
usrbinexec_SCRIPTS = chkdupexe scriptreplay
|
||||
usrbinexec_SCRIPTS = chkdupexe
|
||||
|
||||
CLEANFILES = chkdupexe scriptreplay
|
||||
CLEANFILES = chkdupexe
|
||||
|
||||
dist_man_MANS = cal.1 chkdupexe.1 ddate.1 logger.1 look.1 mcookie.1 \
|
||||
namei.1 script.1 whereis.1 scriptreplay.1
|
||||
|
|
|
|||
|
|
@ -149,8 +149,18 @@ scriptreplay timingfile [typescript [divisor]]
|
|||
.IX Header "DESCRIPTION"
|
||||
This program replays a typescript, using timing information to ensure that
|
||||
output happens at the same speed as it originally appeared when the script
|
||||
was recorded. It is only guaranteed to work properly if run on the same
|
||||
terminal the script was recorded on.
|
||||
was recorded.
|
||||
.PP
|
||||
The replay simply displays the information again; the programs
|
||||
that were run when the typescript was being recorded are not run again.
|
||||
Since the same information is simply being displayed,
|
||||
.B scriptreplay
|
||||
is only guaranteed to work properly if run on the same type of
|
||||
terminal the typescript was recorded on. Otherwise, any escape characters
|
||||
in the typescript may be interpreted differently by the terminal to
|
||||
which
|
||||
.B scriptreplay
|
||||
is sending its output.
|
||||
.PP
|
||||
The timings information is what script outputs to standard error if it is
|
||||
run with the \-t parameter.
|
||||
|
|
@ -158,8 +168,11 @@ run with the \-t parameter.
|
|||
By default, the typescript to display is assumed to be named \*(L"typescript\*(R",
|
||||
but other filenames may be specified, as the second parameter.
|
||||
.PP
|
||||
If the third parameter exits, it is used as a time divisor. For example,
|
||||
specifying a divisor of 2 makes the script be replayed twice as fast.
|
||||
If the third parameter is specified, it is used as a speed-up multiplier. For
|
||||
example, a speed-up of 2 makes
|
||||
.B scriptreplay
|
||||
go twice as fast and a speed-up of 0.1 makes it go ten times slower
|
||||
than the original session.
|
||||
.SH "EXAMPLE"
|
||||
.IX Header "EXAMPLE"
|
||||
.Vb 7
|
||||
|
|
@ -176,10 +189,23 @@ specifying a divisor of 2 makes the script be replayed twice as fast.
|
|||
.BR script (1)
|
||||
.SH "COPYRIGHT"
|
||||
.IX Header "COPYRIGHT"
|
||||
This program is in the public domain.
|
||||
Copyright \(co 2008 James Youngman
|
||||
.PP
|
||||
Copyright \(co 2008 Karel Zak
|
||||
.PP
|
||||
This is free software; see the source for copying conditions. There is NO
|
||||
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
||||
PURPOSE.
|
||||
.PP
|
||||
Released under the GNU General Public License version 2 or later.
|
||||
.SH "AUTHOR"
|
||||
.IX Header "AUTHOR"
|
||||
Joey Hess <joey@kitenet.net>
|
||||
The original
|
||||
.B scriptreplay
|
||||
program was written by Joey Hess <joey@kitenet.net>.
|
||||
The program was re-written in C by James Youngman <jay@gnu.org> and Karel Zak <kzak@redhat.com>.
|
||||
.SH AVAILABILITY
|
||||
The scriptreplay command is part of the util-linux-ng package and is available from
|
||||
The
|
||||
.B scriptreplay
|
||||
command is part of the util-linux-ng package and is available from
|
||||
ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
|
||||
|
|
|
|||
|
|
@ -0,0 +1,179 @@
|
|||
/*
|
||||
* Copyright (C) 2008, Karel Zak <kzak@redhat.com>
|
||||
* Copyright (C) 2008, James Youngman <jay@gnu.org>
|
||||
*
|
||||
* This file is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This file is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
*
|
||||
* Based on scriptreplay.pl by Joey Hess <joey@kitenet.net>
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdarg.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <time.h>
|
||||
#include <limits.h>
|
||||
#include <math.h>
|
||||
#include <sys/select.h>
|
||||
#include <unistd.h>
|
||||
#include <err.h>
|
||||
|
||||
#include "nls.h"
|
||||
|
||||
#define SCRIPT_MIN_DELAY 0.0001 /* from original sripreplay.pl */
|
||||
|
||||
void __attribute__((__noreturn__))
|
||||
usage(int rc)
|
||||
{
|
||||
printf("%s <timingfile> [<typescript> [<divisor>]]\n",
|
||||
program_invocation_short_name);
|
||||
exit(rc);
|
||||
}
|
||||
|
||||
static double
|
||||
getnum(const char *s)
|
||||
{
|
||||
double d;
|
||||
char *end;
|
||||
|
||||
errno = 0;
|
||||
d = strtod(s, &end);
|
||||
|
||||
if (end && *end != '\0')
|
||||
errx(EXIT_FAILURE, _("expected a number, but got '%s'"), s);
|
||||
|
||||
if ((d == HUGE_VAL || d == -HUGE_VAL) && ERANGE == errno)
|
||||
err(EXIT_FAILURE, _("divisor '%s'"), s);
|
||||
|
||||
if (!(d==d)) { /* did they specify "nan"? */
|
||||
errno = EINVAL;
|
||||
err(EXIT_FAILURE, _("divisor '%s'"), s);
|
||||
}
|
||||
return d;
|
||||
}
|
||||
|
||||
static void
|
||||
delay_for(double delay)
|
||||
{
|
||||
#ifdef HAVE_NANOSLEEP
|
||||
struct timespec ts, remainder;
|
||||
ts.tv_sec = (time_t) delay;
|
||||
ts.tv_nsec = (delay - ts.tv_sec) * 1.0e9;
|
||||
|
||||
while (-1 == nanosleep(&ts, &remainder)) {
|
||||
if (EINTR == errno)
|
||||
ts = remainder;
|
||||
else
|
||||
break;
|
||||
}
|
||||
#else
|
||||
struct timeval tv;
|
||||
tv.tv_sec = (long) delay;
|
||||
tv.tv_usec = (delay - tv.tv_sec) * 1.0e6;
|
||||
select(0, NULL, NULL, NULL, &tv);
|
||||
#endif
|
||||
}
|
||||
|
||||
static void
|
||||
emit(FILE *fd, const char *filename, size_t ct)
|
||||
{
|
||||
char buf[BUFSIZ];
|
||||
|
||||
while(ct) {
|
||||
size_t len, cc;
|
||||
|
||||
cc = ct > sizeof(buf) ? sizeof(buf) : ct;
|
||||
len = fread(buf, 1, cc, fd);
|
||||
|
||||
if (!len)
|
||||
break;
|
||||
|
||||
ct -= len;
|
||||
cc = write(STDOUT_FILENO, buf, len);
|
||||
if (cc != len)
|
||||
err(EXIT_FAILURE, "write to stdout failed");
|
||||
}
|
||||
|
||||
if (!ct)
|
||||
return;
|
||||
if (feof(fd))
|
||||
errx(EXIT_FAILURE, _("unexpected end of file on %s"), filename);
|
||||
|
||||
err(EXIT_FAILURE, _("failed to read typescript file %s"), filename);
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
FILE *tfile, *sfile;
|
||||
const char *sname, *tname;
|
||||
double divi;
|
||||
int c;
|
||||
unsigned long line;
|
||||
|
||||
/* Because we use space as a separator, we can't afford to use any
|
||||
* locale which tolerates a space in a number. In any case, script.c
|
||||
* sets the LC_NUMERIC locale to C, anyway.
|
||||
*/
|
||||
setlocale(LC_ALL, "");
|
||||
setlocale(LC_NUMERIC, "C");
|
||||
|
||||
bindtextdomain(PACKAGE, LOCALEDIR);
|
||||
textdomain(PACKAGE);
|
||||
|
||||
if (argc < 2 && argc > 4)
|
||||
usage(EXIT_FAILURE);
|
||||
|
||||
tname = argv[1];
|
||||
sname = argc > 2 ? argv[2] : "typescript";
|
||||
divi = argc == 4 ? getnum(argv[3]) : 1;
|
||||
|
||||
tfile = fopen(tname, "r");
|
||||
if (!tfile)
|
||||
err(EXIT_FAILURE, _("cannot open timing file %s"), tname);
|
||||
sfile = fopen(sname, "r");
|
||||
if (!sfile)
|
||||
err(EXIT_FAILURE, _("cannot open typescript file %s"), sname);
|
||||
|
||||
/* ignore the first typescript line */
|
||||
while((c = fgetc(sfile)) != EOF && c != '\n');
|
||||
|
||||
for(line = 0; ; line++) {
|
||||
double delay;
|
||||
size_t blk;
|
||||
char nl;
|
||||
|
||||
if ((fscanf(tfile, "%lf %zd%[\n]\n", &delay, &blk, &nl) != 3) ||
|
||||
(nl != '\n')) {
|
||||
if (feof(tfile))
|
||||
break;
|
||||
if (ferror(tfile))
|
||||
err(EXIT_FAILURE,
|
||||
"failed to read timing file %s", tname);
|
||||
errx(EXIT_FAILURE,
|
||||
_("timings file %s: %lu: expected format"),
|
||||
tname, line);
|
||||
}
|
||||
delay /= divi;
|
||||
|
||||
if (delay > SCRIPT_MIN_DELAY)
|
||||
delay_for(delay);
|
||||
|
||||
emit(sfile, sname, blk);
|
||||
}
|
||||
|
||||
fclose(sfile);
|
||||
fclose(tfile);
|
||||
exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
|
@ -1,83 +0,0 @@
|
|||
#!@PERL@ -w
|
||||
|
||||
# "script -t" will output a typescript with timings
|
||||
# this script "scriptreplay" replays it
|
||||
# run pod2man on it to get a man page
|
||||
|
||||
=head1 NAME
|
||||
|
||||
scriptreplay - play back typescripts, using timing information
|
||||
|
||||
=head1 SYNOPSIS
|
||||
|
||||
scriptreplay timingfile [typescript [divisor]]
|
||||
|
||||
=head1 DESCRIPTION
|
||||
|
||||
This program replays a typescript, using timing information to ensure that
|
||||
output happens at the same speed as it originally appeared when the script
|
||||
was recorded. It is only guaranteed to work properly if run on the same
|
||||
terminal the script was recorded on.
|
||||
|
||||
The timings information is what script outputs to standard error if it is
|
||||
run with the -t parameter.
|
||||
|
||||
By default, the typescript to display is assumed to be named "typescript",
|
||||
but other filenames may be specified, as the second parameter.
|
||||
|
||||
If the third parameter exits, it is used as a time divisor. For example,
|
||||
specifying a divisor of 2 makes the script be replayed twice as fast.
|
||||
|
||||
=head1 EXAMPLE
|
||||
|
||||
% script -t 2> timingfile
|
||||
Script started, file is typescript
|
||||
% ls
|
||||
<etc, etc>
|
||||
% exit
|
||||
Script done, file is typescript
|
||||
% scriptreplay timingfile
|
||||
|
||||
=cut
|
||||
|
||||
use strict;
|
||||
$|=1;
|
||||
open (TIMING, shift)
|
||||
or die "cannot read timing info: $!";
|
||||
open (TYPESCRIPT, shift || 'typescript')
|
||||
or die "cannot read typescript: $!";
|
||||
my $divisor=shift || 1;
|
||||
|
||||
# Read starting timestamp line and ignore.
|
||||
<TYPESCRIPT>;
|
||||
|
||||
my $block;
|
||||
my $oldblock='';
|
||||
while (<TIMING>) {
|
||||
my ($delay, $blocksize)=split ' ', $_, 2;
|
||||
# Sleep, unless the delay is really tiny. Really tiny delays cannot
|
||||
# be accurately done, because the system calls in this loop will
|
||||
# have more overhead. The 0.0001 is arbitrary, but works fairly well.
|
||||
if ($delay / $divisor > 0.0001) {
|
||||
select(undef, undef, undef, $delay / $divisor - 0.0001);
|
||||
}
|
||||
|
||||
read(TYPESCRIPT, $block, $blocksize)
|
||||
or die "read failure on typescript: $!";
|
||||
print $oldblock;
|
||||
$oldblock=$block;
|
||||
}
|
||||
print $oldblock;
|
||||
|
||||
=head1 SEE ALSO
|
||||
|
||||
script(1)
|
||||
|
||||
=head1 COPYRIGHT
|
||||
|
||||
This program is in the public domain.
|
||||
|
||||
=head1 AUTHOR
|
||||
|
||||
Joey Hess <joey@kitenet.net>
|
||||
|
||||
Loading…
Reference in New Issue