Can I determine if the terminal interprets the C1 control codes? - unix

ISO/IEC 2022 defines the C0 and C1 control codes. The C0 set are the familiar codes between 0x00 and 0x1f in ASCII, ISO-8859-1 and UTF-8 (eg. ESC, CR, LF).
Some VT100 terminal emulators (eg. screen(1), PuTTY) support the C1 set, too. These are the values between 0x80 and 0x9f (so, for example, 0x84 moves the cursor down a line).
I am displaying user-supplied input. I do not wish the user input to be able to alter the terminal state (eg. move the cursor). I am currently filtering out the character codes in the C0 set; however I would like to conditionally filter out the C1 set too, if terminal will interpret them as control codes.
Is there a way of getting this information from a database like termcap?

The only way to do it that I can think of is using C1 requests and testing the return value:
$ echo `echo -en "\x9bc"`
^[[?1;2c
$ echo `echo -e "\x9b5n"`
^[[0n
$ echo `echo -e "\x9b6n"`
^[[39;1R
$ echo `echo -e "\x9b0x" `
^[[2;1;1;112;112;1;0x
The above ones are:
CSI c Primary DA; request Device Attributes
CSI 5 n DSR; Device Status Report
CSI 6 n CPR; Cursor Position Report
CSI 0 x DECREQTPARM; Request Terminal Parameters
The terminfo/termcap that ESR maintains (link) has a couple of these requests in user strings 7 and 9 (user7/u7, user9/u9):
# INTERPRETATION OF USER CAPABILITIES
#
# The System V Release 4 and XPG4 terminfo format defines ten string
# capabilities for use by applications, .... In this file, we use
# certain of these capabilities to describe functions which are not covered
# by terminfo. The mapping is as follows:
#
# u9 terminal enquire string (equiv. to ANSI/ECMA-48 DA)
# u8 terminal answerback description
# u7 cursor position request (equiv. to VT100/ANSI/ECMA-48 DSR 6)
# u6 cursor position report (equiv. to ANSI/ECMA-48 CPR)
#
# The terminal enquire string should elicit an answerback response
# from the terminal. Common values for will be ^E (on older ASCII
# terminals) or \E[c (on newer VT100/ANSI/ECMA-48-compatible terminals).
#
# The cursor position request () string should elicit a cursor position
# report. A typical value (for VT100 terminals) is \E[6n.
#
# The terminal answerback description (u8) must consist of an expected
# answerback string. The string may contain the following scanf(3)-like
# escapes:
#
# %c Accept any character
# %[...] Accept any number of characters in the given set
#
# The cursor position report () string must contain two scanf(3)-style
# %d format elements. The first of these must correspond to the Y coordinate
# and the second to the %d. If the string contains the sequence %i, it is
# taken as an instruction to decrement each value after reading it (this is
# the inverse sense from the cup string). The typical CPR value is
# \E[%i%d;%dR (on VT100/ANSI/ECMA-48-compatible terminals).
#
# These capabilities are used by tac(1m), the terminfo action checker
# (distributed with ncurses 5.0).
Example:
$ echo `tput u7`
^[[39;1R
$ echo `tput u9`
^[[?1;2c
Of course, if you only want to prevent display corruption, you can use less approach, and let the user switch between displaying/not displaying control characters (-r and -R options in less). Also, if you know your output charset, ISO-8859 charsets have the C1 range reserved for control codes (so they have no printable chars in that range).

Actually, PuTTY does not appear to support C1 controls.
The usual way of testing this feature is with vttest, which provides menu entries for changing the input- and output- separately to use 8-bit controls. PuTTY fails the sanity-check for each of those menu entries, and if the check is disabled, the result confirms that PuTTY does not honor those controls.

I don't think there's a straightforward way to query whether the terminal supports them. You can try nasty hacky workarounds (like print them and then query the cursor position) but I really don't recommend anything along these lines.
I think you could just filter out these C1 codes unconditionally. Unicode declares the U+0080.. U+009F range as control characters anyway, I don't think you should ever use them for anything different.
(Note: you used the example 0x84 for cursor down. It's in fact U+0084 encoded in whichever encoding the terminal uses, e.g. 0xC2 0x84 for UTF-8.)

Doing it 100% automatically is challenging at best. Many, if not most, Unix interfaces are smart (xterms and whatnot), but you don't actually know if connected to an ASR33 or a PC running MSDOS.
You could try some of the terminal interrogation escape sequences and timeout if there is no reply. But then you might have to fall back and maybe ask the user what kind of terminal they are using.

Related

pdf2image: how to remove the '0001' in jpg file names? (Solved)

My goal is to convert a multi page pdf file into a number of .jpg files, in such a way that the images are directly written to the hard-disk/SSD in stead of stored into memory.
In python 3.11 :
from pdf2image import convert_from_path
poppler_path = r".\poppler-22.12.0\Library\bin"
images = convert_from_path('test.pdf', output_folder='.', output_file = 'test',
poppler_path=poppler_path, paths_only = True)
pdf2image generates files with the following names
'test_0001-1.jpg',
'test_0001-2.jpg',
etc
Problem:
I would like to have the files have names without the suffix '_0001-' (eg. 'test1.jpg').
The only way so far seems to be to use convert_from_path WITHOUT output_folder and then
save each images by images.save. But in this way the images are stored first into memory, which easyly can become a lot of Mbytes.
Is it possible to change the way pdf2image generates the file names when saving images directly to files?
I'm not familiar if Poppler already has some parameters to customize the generated file names, but you can always do this:
Run the command in an empty directory (e.g. in tempfile.TemporaryDirectory())
After command finishes, list the contents of the directory and store the result in a list
Iterate over the list with a regex that will match the numbers, and create a dict for the mapping (integer to file name)
At this point you are free to rename the files to whatever you like, or to process them.
The benefit of this solution is that it's neutral, robust and works for many similar scenarios.
hi have a look at your codebase in file generators.py ,
I got mine from def counter_generator(prefix="", suffix="", padding_goal=4):
at line 41 you have :
....
#threadsafe
def counter_generator(prefix="", suffix="", padding_goal=4):
"""Returns a joined prefix, iteration number, and suffix"""
i = 0
while True:
i += 1
yield str(prefix) + str(i).zfill(padding_goal) + str(suffix)
....
think you need to play with the yield line zfill() :
The Python String zfill() method is used to fill the string with zeroes on its left until it reaches a certain width; else called Padding. If the prefix of this string is a sign character (+ or -), the zeroes are added after the sign character rather than before.
The Python String zfill() method does not fill the string if the length of the string is greater than the total width of the string after padding.
Note: The zfill() method works similar to the rjust() method if we assign '0' to the fillchar parameter of the rjust() method.
https://www.tutorialspoint.com/python/string_zfill.htm
Just use poppler utilities direct (or xpdf pdftopng) so simply call it via a shell (add other options like -r 200 as desired for resolutions other than 150)
I recommend PNG as better image fidelity, however if you want .jpg replace "-png" below with "-jpg" (direct answer as asked would be pdftoppm -jpg -f 1 -l 9 -sep "" test.pdf "test") but do follow the below enhancement for file sorting. Windows file sorting needs leading zeros otherwise sort in zip or folder is 1,10,11...2,20...., which is often undesirable.
"path to bin\pdftoppm" -png "path to \in.pdf" "name"
Result =
name-1.png
name-2.png etc.
adding digits is limited compared to other apps so if you want "name-01.png" you need to only output pages 1-9 as
\bin>pdftoppm -png -f 1 -l 9 -sep "0" in.pdf "name-"
then for pages 10 to ## use say for up to 99 page file use default (it will only use the page numbers that are available)
\bin>pdftoppm -png -f 10 -l 99 in.pdf "name"
thus for 12 pages this would produce only -10 -11 and -12 as required
likewise, for up to 9999 pages you need 4 calls, if you don't want - simply delete it. For different output directory adjust output accordingly.
set "name=%~dpn1"
set "bin=path to Poppler\Release-22.12.0-0\poppler-22.12.0\Library\bin"
"%bin%\pdftoppm" -png -r 200 -f 1 -l 9 -sep "0" "%name%.pdf" "%name%-00"
"%bin%\pdftoppm" -png -r 200 -f 10 -l 99 -sep "0" "%name%.pdf" "%name%-0"
"%bin%\pdftoppm" -png -r 200 -f 100 -l 999 -sep "0" "%name%.pdf" "%name%-"
"%bin%\pdftoppm" -png -r 200 -f 1000 -l 9999 -sep "" "%name%.pdf" "%name%-"
in say example for 12 page above the worst case would be last calls replies
Wrong page range given: the first page (100) can not be after the last page (12). and same for 1000 Thus, those warnings can be ignored.
Those 4 lines could be in a windows or OS script batch file (for sendto or drag and drop) that accepts arguments then very simply use in system or python by call pdf2png.bat input.pdf for each file and output will in that simple case be same directory.

How do facetiles in Apple Photos that correspond to RKFace.modelId?

I have been digging through the Apple Photos macOS app for a couple weekends now and I am stuck. I am hoping the smart people at StackOverflow can figure this out.
What I don't know:
How are new hex directories determined and how do they correspond to RK.modelId. Perhaps 16 mod of RKFace.ModelId, or mod 256 of RKFace.ModelId?
After a while, the facetile hex value no longer corresponds to the RKFace.ModelId. For example RKFace.modelId 61047 should be facetile_ee77.jpeg. The correct facetile, however, is face/20/01/facetile_1209b.jpeg. hex value 1209b is dec value 73883 for which I have no RKFace.ModelId.
Things I know:
Apple Photos leverages deep learning networks to detect and crop faces out of your imported photos. It saves a cropped jpeg these detected faces into your photo library in resources/media/face/00/00/facetile_1.jpeg.
A record corresponding to this facetile is inserted into RKFace where RKFace.modelId integer is the decimal number of tail hex version of the filename. You can use a standard dec to hex converter and derive the correct values. For example:
Each subdirectory, for example "/00/00" will only hold a maximum of 256 facetiles before it starts a new directory. The directory name is also in hex format with directories. For example 3e, 3f.
While trying to render photo mosaics, I stumbled upon that issue, too...
Then I was lucky to find both a master image and the corresponding facetile,
allowing me to grep around, searching for the decimal and hex equivalent of the numbers embedded in the filenames.
This is what I came up with (assuming you are searching for someone named NAME):
SELECT
printf('%04x', mr.modelId) AS tileId
FROM
RKModelResource mr, RKFace f, RKPerson p
WHERE
f.modelId = mr.attachedModelId
AND f.personId = p.modelId
AND p.displayName = NAME
This select prints out all RKModelResource.modelIds in hex, used to name the corresponding facetiles you were searching for. All that is needed now is the complete path to the facetile.
So, a complete bash script to copy all those facetiles of a person (to a local folder out in the current directory) could be:
#!/bin/bash
set -eEu
PHOTOS_PATH=$HOME/Pictures/Photos\ Library.photoslibrary
DB_PATH=$PHOTOS_PATH/database/photos.db
echo $NAME
mkdir -p out/$NAME
TILES=( $(sqlite3 "$DB_PATH" "SELECT printf('%04x', mr.modelId) AS tileId FROM RKModelResource mr, RKFace f, RKPerson p WHERE f.modelId = mr.attachedModelId AND f.personId = p.modelId AND p.displayName='"$NAME"'") )
for TILE in ${TILES[#]}; do
FOLDER=${TILE:0:2}
SOURCE="$PHOTOS_PATH/resources/media/face/$FOLDER/00/facetile_$TILE.jpeg"
[[ -e "$SOURCE" ]] || continue
TARGET=out/$NAME/$TILE.jpeg
[[ -e "$TARGET" ]] && continue
cp "$SOURCE" "$TARGET" || :
done

What's the difference between cursor_up (cuu1) and key_up (kcuu1) in terminfo(5)?

In terminfo(5):
Variable String
Capname
TCap Code
Description
cursor_up
cuu1
up
up one line
key_up
kcuu1
ku
up-arrow key
I tried with tput and they produce the same output:
$ tput cuu1 | hd -C
00000000 1b 5b 41 |.[A|
00000003
$ tput kcuu1 | hd -C
00000000 1b 5b 41 |.[A|
00000003
In a terminfo description, names beginning with k denote keys, while other names are used for non-key capabilities. For most keys, there is no readily apparent relationship between the keys and an existing escape sequence, but cursor-keys are the exception.
Whether they are the same or not depends upon the terminal description. For TERM=linux, they happen to be the same, however a terminal description could be written for the Linux console where they are not.
The distinction is whether the terminal is initialized into application mode or left in the (default/power-up) normal mode. In application mode, the cursor keys would send EscapeO as a prefix rather than Escape[.
A little over half (54%) of the terminal descriptions in the ncurses terminal database use application mode, meaning that cuu1 is more often than not different from kcuu1.
There's another quirk to be aware of: for other cursor movement, such as cud1, the terminal description may say \n, while the key for cursor-down would not send that character (see iTerm for example).
Further reading:
My cursor keys do not work
cursor_up is the control sequence sent by the host to the terminal to move the cursor up a line.
key_up is the control sequence sent by the terminal to the host when the up arrow key is pressed.
In VT100-based terminals (which includes all sane modern terminal emulators), these sequences are identical. However, some older terminal hardware may have used different sequences in these two roles, so terminfo keeps them separate.

Insert character Cisco IOS EEM Script

I am extracting the ip address of an interface and using that address' 3rd octet as part of the BGP AS number. I need to insert a 0 before the number if the 3rd octet is < 10.
For example, if 3rd octet = 8 then BGP AS = 11108
Here is my current and unfinished applet.
event manager applet replace
event none
action 1.0 cli command "conf t"
action 1.1 cli command "do show ip int brief vlan 1"
action 1.2 regexp " [0-9.]+ " $_cli_result ip match
action 2.0 regexp {([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)} $_cli_result match ip
action 2.1 regexp {([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)} $ip match first second third forth
action 2.2 set vl1 $first.$second.$third.$forth
action 2.3 cli command "router bpg 111$third"
The simplest method here is to use format with the right formatting sequence. (If you've ever used sprintf() in C, you'll understand what the format command does straight off. Except the Tcl command doesn't have any problems with buffer overruns or other tricky bits like that.)
# Rest of your script unchanged; I'm lazy so I'll not repeat it here
set bpg [format "652%02d" $third]
action 2.3 cli command "router bpg $bpg"
The key here is that %02d does formatting (%) of a decimal number (d) in a zero-padded (0) field of width two (2). And there's a literal 652 in front of it (no % there so literal).
You can roll the above into a single line if you want, but I think it is much clearer to write it in two (there's really no good excuse for writing unclear code, as it just makes your life harder later and it doesn't really take much less time to write clearly in the first place):
action 2.3 cli command "router bpg [format 652%02d $third]"

Parse .a2l and .hex files

I'm trying to parse some .a2l and .hex files to extract variables and their values. So far l don't know how to find the values of the variables in the .hex file. Here is a link to download an example of these files.
To be more specific : How can I read the value at the address 0x810600 in the .hex file ?
/begin CHARACTERISTIC ASAM.C.DEPENDENT.REF_1.SWORD
"Dependent SWORD"
VALUE
0x810600
RL.FNC.SWORD.ROW_DIR
0
CM.IDENTICAL
-32268 32267
/begin DEPENDENT_CHARACTERISTIC
"X1 + 5"
ASAM.C.SCALAR.SBYTE.IDENTICAL
/end DEPENDENT_CHARACTERISTIC
DISPLAY_IDENTIFIER DI.ASAM.C.DEPENDENT.REF_1.SWORD
/end CHARACTERISTIC
In the same A2L, please find RL.FNC.SWORD.ROW_DIR item, I guess it might be kind of signed word (2 bytes) type.
I'm not sure if this is kind of array or some special type... I assume this is just single variable (scalar).
Again, find CM.IDENTICAL item, as it's name maybe it's identical compu_method. This means HEX value 0 -> displayed screen as 0, HEX value 100 -> displayed screen as 100, ... identical between internal value and physical value. No special conversion I guess.
Go to the address 0x810600 in HEX then you can find some values there. As it is identical compu_method type, the value in HEX might be identically displayed in M/C SW (INCA, Vision, CANape, ...) I guess.
HEX is of intel hex format. This format is used to map each part of the file to a part in virtual address space of device. You can also use the following command if you use Linux:
objdump -s file.hex

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