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wcsxfrm() with empty locale crashes the runtime

From: LRN <lrn1986 at gmail dot com>
To: cygwin at cygwin dot com
Date: Tue, 19 Mar 2019 22:28:40 +0300
Subject: wcsxfrm() with empty locale crashes the runtime

The testcase is attached. Running it with Cygwin-i386 leads to a crash. My
guess is that the implementation is not POSIX-conformant and tries to
dereference the first argument (NULL), even though the third argument is 0.

Tested with Cygwin-3.0.4.

Attachment: wcsxfrm_test.c
Description: Text document

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Description: OpenPGP digital signature

Follow-Ups:
- Re: wcsxfrm() with empty locale crashes the runtime
  - From: Corinna Vinschen
- Re: wcsxfrm() with empty locale crashes the runtime
  - From: Brian Inglis

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