xz: Multiple fixes.

The code assumed that printing numbers with thousand separators
and decimal points would always produce only US-ASCII characters.
This was used for buffer sizes (with snprintf(), no overflows)
and aligning columns of the progress indicator and --list. That
assumption was wrong (e.g. LC_ALL=fi_FI.UTF-8 with glibc), so
multibyte character support was added in this commit. The old
way is used if the operating system doesn't have enough multibyte
support (e.g. lacks wcwidth()).

The sizes of buffers were increased to accomodate multibyte
characters. I don't know how big they should be exactly, but
they aren't used for anything critical, so it's not too bad.
If they still aren't big enough, I hopefully get a bug report.
snprintf() takes care of avoiding buffer overflows.

Some static buffers were replaced with buffers allocated on
stack. double_to_str() was removed. uint64_to_str() and
uint64_to_nicestr() now share the static buffer and test
for thousand separator support.

Integrity check names "None" and "Unknown-N" (2 <= N <= 15)
were marked to be translated. I had forgot these, plus they
wouldn't have worked correctly anyway before this commit,
because printing tables with multibyte strings didn't work.

Thanks to Marek Černocký for reporting the bug about
misaligned table columns in --list output.

1 files changed, 30 insertions, 0 deletions

diff --git a/m4/tuklib_mbstr.m4 b/m4/tuklib_mbstr.m4
new file mode 100644
index 00000000..991be9b9
--- /dev/null
+++ b/m4/tuklib_mbstr.m4
@@ -0,0 +1,30 @@
+#
+# SYNOPSIS
+#
+#   TUKLIB_MBSTR
+#
+# DESCRIPTION
+#
+#   Check if multibyte and wide character functionality is available
+#   for use by tuklib_mbstr_* functions. If not enough multibyte string
+#   support is available in the C library, the functions keep working
+#   with the assumption that all strings are a in single-byte character
+#   set without combining characters, e.g. US-ASCII or ISO-8859-*.
+#
+#   This .m4 file and tuklib_mbstr.h are common to all tuklib_mbstr_*
+#   functions, but each function is put into a separate .c file so
+#   that it is possible to pick only what is strictly needed.
+#
+# COPYING
+#
+#   Author: Lasse Collin
+#
+#   This file has been put into the public domain.
+#   You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_MBSTR], [
+AC_REQUIRE([TUKLIB_COMMON])
+AC_FUNC_MBRTOWC
+AC_CHECK_FUNCS([wcwidth])
+])dnl