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Ruslan Ermilov 2001-05-18 10:39:41 +00:00
parent 94ccf5741c
commit 8275cc7fb1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76807
1 changed files with 34 additions and 37 deletions
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71
usr.bin/scrshot/scrshot.1
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@ -37,20 +37,22 @@ The
.Nm
utility uses the
.Xr syscons 4
.Li CONS_SCRSHOT
ioctl to capture the current contents of the video buffer corresponding to the
.Dv CONS_SCRSHOT
.Xr ioctl 2
to capture the current contents of the video buffer corresponding to the
terminal device given as the first argument.
.Nm
writes version and additional information to the standard output, followed by
the contents of the terminal device.
.Sh IMPLEMENTATION NOTES
PC video memory is typically arranged in two byte tuples, one per character
position. In each tuple, the first byte will be the character code, and the
second byte is the character's colour attribute.
position.
In each tuple, the first byte will be the character code, and the
second byte is the character's color attribute.
.Pp
The colour attribute byte is further broken down in to the low nybble, which
specifies which of 16 different foreground colours is active, and the high
nybble, which specifies which of 16 different background colours is active.
The color attribute byte is further broken down in to the low nibble, which
specifies which of 16 different foreground colors is active, and the high
nibble, which specifies which of 16 different background colors is active.
.Pp
.Bl -hang -offset indent -compact
.It 0
@ -87,15 +89,14 @@ Yellow
White
.El
.Pp
It can be seen that the last 8 colours are brighter versions of the first 8.
It can be seen that the last 8 colors are brighter versions of the first 8.
.Pp
For example, the two bytes
.Bd -literal -offset indent
65 158
.Ed
.Pp
specify an uppercase A (character code 65), in yellow (low nybble 15) on a
light blue background (high nybble 9).
.Dl "65 158"
.Pp
specify an uppercase A (character code 65), in yellow (low nibble 15) on a
light blue background (high nibble 9).
.Pp
The
.Nm
@ -103,19 +104,19 @@ output contains a small header which includes additional information which may
be useful to utilities processing the output.
.Pp
The first 10 bytes are always arranged as follows:
.Bl -column "Byte range " "Contents " -offset -indent
.It Sy Byte Range Ta Sy Contents
.It 1 thru 8 Ta Literal text Dq SCRSHOT_
.It 9 Ta File format version number
.It 10 Ta Remaining number of bytes in the header
.Bl -column "Byte range" "Contents" -offset indent
.It Sy "Byte Range Contents"
.It "1 thru 8 Literal text" Dq Li SCRSHOT_
.It "9 File format version number"
.It "10 Remaining number of bytes in the header"
.El
.Pp
Subsequent bytes depend on the version number.
.Bl -column "Version " "4 and up" -offset indent
.It Sy Version Ta Sy Byte Ta Sy Meaning
.It 1 Ta 11 Ta Terminal width, in characters
.It Ta 12 Ta Terminal depth, in characters
.It Ta 13 and up Ta The snapshot data
.Bl -column "Version" "13 and up" -offset indent
.It Sy "Version Byte Meaning"
.It "1 11 Terminal width, in characters"
.It " 12 Terminal depth, in characters"
.It " 13 and up The snapshot data"
.El
.Pp
So a dump of an 80x25 screen would start (in hex)
@ -128,24 +129,23 @@ So a dump of an 80x25 screen would start (in hex)
| `--------- File format version 1
`------------------------ Literal "SCRSHOT_"
.Ed
.Sh RETURN VALUES
The
.Nm
utility exits 0 on success or >0 if an error occurred.
.Sh EXAMPLES
The command:
.Bd -literal -offset indent
.Ic scrshot /dev/ttyv0 > shot.scr
.Ed
.Pp
.Dl "scrshot /dev/ttyv0 > shot.scr"
.Pp
will capture the contents of the first virtual terminal, and redirect the
output to the
.Li shot.scr
.Pa shot.scr
file.
.Sh DIAGNOSTICS
The
.Nm
utility exits 0 on success or >0 if an error occurred.
.Sh SEE ALSO
.Xr syscons 4 ,
.Xr ascii 7 ,
.Xr watch 8 .
.Xr watch 8
.Pp
The various
.Li shot2*
@ -155,11 +155,8 @@ category of the ports collection.
.Sh HISTORY
A
.Nm
utility appeared in
.Fx 5.0
and was backported to
utility first appeared in
.Fx 4.4 .
.Sh AUTHORS
.An Joel Holveck Aq joelh@gnu.org
and
.An Nik Clayton Aq nik@FreeBSD.org
.An Nik Clayton Aq nik@FreeBSD.org