Dear Cygwin community,
I observe the following on my Cygwin: 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.
I have written a small C program that displays arguments, and run it three
times:
#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,
Dmitry
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