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From: | Kyzer <stuart DOT caie AT gmail DOT com> |
Date: | Wed, 25 Mar 2015 14:34:28 +0000 |
Message-ID: | <CAOCY71AaRWGEFVcPqLKNEjqWEkELdfLD-KBvxMAQCi0wt2A5ZA@mail.gmail.com> |
Subject: | With bad UTF-8, cygwin can create files it can't read |
To: | cygwin AT cygwin DOT com |
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Hello, I've found that if you use cygwin to create a file with badly-encoded UTF-8, readdir() gives out an entry with a name that cygwin won't subsequently accept. * create a file using filename with hex bytes F4 8F BF BF * readdir() reports the filename as hex bytes E2 8E B3 ED BF BF * attempting to open or unlink the filename E2 8E B3 ED BF BF fails * attempting to open or unlink the filename F4 8F BF BF succeeds Here's a test case. Beware that it will delete everything in the current directory. #include <stdio.h> #include <dirent.h> int main() { DIR *d; struct dirent *de; char *fname = "\xF4\x8F\xBF\xBF"; // touch file fclose(fopen(fname, "wb")); // iterate through dir d = opendir("."); while ((de = readdir(d))) { if (de->d_name[0] == '.') continue; printf("unlink(%s) = %d\n", de->d_name, unlink(de->d_name)); } closedir(d); // show that unlink works if you know the real filename printf("unlink(%s) = %d\n", fname, unlink(fname)); } This outputs (piped through hexdump -C) 00000000 75 6e 6c 69 6e 6b 28 e2 8e b3 ed bf bf 29 20 3d |unlink(......) =| 00000010 20 2d 31 0a 75 6e 6c 69 6e 6b 28 f4 8f bf bf 29 | -1.unlink(....)| 00000020 20 3d 20 30 0a | = 0.| 00000025 e.g. unlink(\xe2\x8e\xb3\xed\xbf\xbf) = -1 unlink(\xf4\x8f\xbf\xbf) = 0 This is with cygwin package 1.7.35 $ cygcheck -c cygwin Cygwin Package Information Package Version Status cygwin 1.7.35-1 OK WIndows / DOS does not have the problem: c:\test\t>dir Volume in drive C has no label. Volume Serial Number is ....-.... Directory of c:\test\t 25/03/2015 14:30 <DIR> . 25/03/2015 14:30 <DIR> .. 25/03/2015 14:30 0 ?? 1 File(s) 0 bytes 2 Dir(s) 39,906,525,184 bytes free c:\test\t>del * c:\test\t\*, Are you sure (Y/N)? y c:\test\t>dir Volume in drive C has no label. Volume Serial Number is ....-.... Directory of c:\test\t 25/03/2015 14:31 <DIR> . 25/03/2015 14:31 <DIR> .. 0 File(s) 0 bytes 2 Dir(s) 39,906,525,184 bytes free Regards Stuart -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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