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From: Bruno Haible <bruno@clisp.org>
To: musl@lists.openwall.com
Date: Mon, 12 Jun 2023 16:44:44 +0200
Message-ID: <2976941.0vhOF50zNu@nimes>
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Subject: [musl] swprintf %lc directive does not work for some wide characters

According to ISO C 11 =A7 7.29.2.1, in the *wprintf family of functions, the
%lc directive works like this:
  "[If an l length modifier is present,] the wint_t argument is converted to
   wchar_t and written."

Likewise in ISO C 17 =A7 7.29.2 and ISO C 23 =A7 7.31.2.1 and in POSIX:2018
<https://pubs.opengroup.org/onlinepubs/9699919799/functions/fwprintf.html>.

In musl libc 1.2.4 (as part of Alpine Linux 3.18.0) this does not work for
some characters.

How to reproduce:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D foo.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
#include <stdio.h>
#include <wchar.h>
int main ()
{
  static wint_t L_invalid =3D (wchar_t) 0x76543210;
  wchar_t buf[3];
  int ret =3D swprintf (buf, 3, L"%lc", L_invalid);
  if (ret >=3D 0)
    fprintf (stderr, "OK, %d characters\n", ret);
  else
    perror ("swprintf failed");
}
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
$ gcc -Wall foo.c
$ ./a.out

Expected output:
OK, 1 characters

Actual output:
swprintf failed: Illegal byte sequence