[musl] [BUG] swprintf() doesn't handle Unicode characters correctly

[Konstantin Isakov <dragonroot@gmail.com>]

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Hi,

The following program:

===================================
#include <stdio.h>
#include <wchar.h>

int main()
{
  wchar_t buf[ 32 ];

  swprintf( buf, sizeof( buf ) / sizeof( *buf ), L"ab\u00E1c" );

  for ( wchar_t * p = buf; *p; ++p )
    printf( "%u\n", ( unsigned ) *p );

  return 0;
}
===================================

With musl 1.2.2 produces the following output:
97
98

The expected output is:
97
98
225
99

With musl, only the first two characters ('a' and 'b') are processed, and
the string ends on a Unicode character (U+00E1, which is an 'a' with acute
accent), instead of outputting it and the last character, 'c'.

Please CC me when replying. Thanks!

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