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Re: Quotes around command-line argument that has unicode characters are not removed




Greetings, Dmitry Katsubo!

> Dear Cygwin community,

> I observe the following on my Cygwin:

This is not cygwin, this is bare Windows.

> when I put quotes around file that has
> non-ASCII symbols, these quotes are passed to argv of the process literally,
> otherwise they are removed. I would expect that there is a consistency.

Parameter unquoting done by the shell.
CMD does that differently from POSIX shells.

> I have written a small C program that displays arguments, and run it three
> times:

Run it in bash. I'm pretty sure you will see your results more consistent.

> #1 For the file with space, taken into quotes ("the file.txt") -- OK
> #2 For the file with non-ASCII characters (Château.txt) -- OK
> #3 For the file with non-ASCII characters, taken into quotes ("Château.txt") -- WRONG

> d:\cli> uname -a
> CYGWIN_NT-6.1-WOW PC 2.9.0(0.318/5/3) 2017-09-12 10:41 i686 Cygwin

> D:\cli> chcp
> Active code page: 866

> D:\cli> dir
> ...cut...
> 2018-03-22  00:43                 0 Château.txt
> 2018-03-22  00:01               393 test.c
> 2018-03-22  00:01           150,230 test.exe
> 2018-03-21  00:15               186 test.pl
> 2018-03-22  00:43                 0 the file.txt
> 2018-03-22  00:40                16 текст плюс.txt
>                6 File(s)        150,825 bytes
>                2 Dir(s)  41,972,293,632 bytes free

> D:\cli> test "the file.txt"
> param 0 = test
> param 1 = the file.txt
> File 'the file.txt' was opened

> D:\cli> test Château.txt
> param 0 = test
> param 1 = Château.txt
> File 'Château.txt' was opened

> D:\cli> test "Château.txt"
> param 0 = test
> param 1 = "Château.txt"
> Failed to open '"Château.txt"': No such file or directory

> As one can see, the last run fails. I am a bit puzzled: how can I pass the name
> of the file with space and Unicode symbols? I need to do it in uniform way, as I
> am calling a Cygwin program from native Windows program, as in [1].

> D:\cli> test "текст плюс.txt"
> param 0 = test
> param 1 = "текст плюс.txt"
> Failed to open '"текст плюс.txt"': No such file or directory

> I have search a bit, but I couldn't find a direct answer. From post [1] and [2]
> I see that compiler inserts the code to do some argument pre-processing like
> @pathnames [3], but what are exactly the rules? Is quote pre-processing done in
> dcrt0.cc:177 [4]?

> Any feedback is appreciated.

> [1] https://sourceware.org/ml/cygwin/2016-05/msg00082.html
> [2] http://daviddeley.com/autohotkey/parameters/parameters.htm
> [3] https://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-at
> [4] https://github.com/openunix/cygwin/blob/master/winsup/cygwin/dcrt0.cc#L177

> === test.c ===
> #include <stdio.h>
> #include <errno.h>
> #include <string.h>

> int main(int argc, char* argv[])
> {
>         for (int i = 0; i < argc; i++)
>         {
>                 printf("param %d = %s\n", i, argv[i]);
>         }
>         FILE* f = fopen(argv[1], "r");
>         if (f != NULL)
>         {
>                 printf("File '%s' was opened\n", argv[1]);
>                 fclose(f);
>         } else {
>                 printf("Failed to open '%s': %s\n", argv[1], strerror(errno));
>         }
>         return 0;
> }



-- 
With best regards,
Andrey Repin
Thursday, March 22, 2018 14:21:25

Sorry for my terrible english...
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