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authorDenys Vlasenko <vda.linux@googlemail.com>2010-01-31 16:04:30 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2010-01-31 16:04:30 +0100
commit40e4e88a28398c49d326b0fdf0d7f100f08b8f8d (patch)
tree89e7c1880d057393ee6a5596bee77d802b882c3f /libbb
parent344a44fbc5a236a06d840e7776ccbcc4702efa7f (diff)
downloadbusybox-40e4e88a28398c49d326b0fdf0d7f100f08b8f8d.tar.gz
exclude more invalid unicode chars
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb')
-rw-r--r--libbb/unicode_wcwidth.c72
1 files changed, 63 insertions, 9 deletions
diff --git a/libbb/unicode_wcwidth.c b/libbb/unicode_wcwidth.c
index ab62b18f6..410c741ac 100644
--- a/libbb/unicode_wcwidth.c
+++ b/libbb/unicode_wcwidth.c
@@ -59,8 +59,39 @@
* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
*/
-#if CONFIG_LAST_SUPPORTED_WCHAR == 0
-# define LAST_SUPPORTED_WCHAR ((1 << 31) - 1)
+/* Assigned Unicode character ranges:
+ * Plane Range
+ * 0 0000–FFFF Basic Multilingual Plane
+ * 1 10000–1FFFF Supplementary Multilingual Plane
+ * 2 20000–2FFFF Supplementary Ideographic Plane
+ * 3 30000-3FFFF Tertiary Ideographic Plane (no chars assigned yet)
+ * 4-13 40000–DFFFF currently unassigned
+ * 14 E0000–EFFFF Supplementary Special-purpose Plane
+ * 15 F0000–FFFFF Supplementary Private Use Area-A
+ * 16 100000–10FFFF Supplementary Private Use Area-B
+ *
+ * "Supplementary Special-purpose Plane currently contains non-graphical
+ * characters in two blocks of 128 and 240 characters. The first block
+ * is for language tag characters for use when language cannot be indicated
+ * through other protocols (such as the xml:lang attribute in XML).
+ * The other block contains glyph variation selectors to indicate
+ * an alternate glyph for a character that cannot be determined by context."
+ *
+ * In simpler terms: it is a tool to fix the "Han unification" mess
+ * created by Unicode committee, to select Chinese/Japanese/Korean/Taiwan
+ * version of a character. (They forgot that the whole purpose of the Unicode
+ * was to be able to write all chars in one charset without such tricks).
+ * Until East Asian users say it is actually necessary to support these
+ * code points in console applications like busybox
+ * (i.e. do these chars ever appear in filenames, hostnames, text files
+ * and such?), we are treating these code points as invalid.
+ *
+ * Tertiary Ideographic Plane is also ignored for now,
+ * until Unicode committee assigns something there.
+ */
+
+#if CONFIG_LAST_SUPPORTED_WCHAR < 126 || CONFIG_LAST_SUPPORTED_WCHAR > 0x30000
+# define LAST_SUPPORTED_WCHAR 0x30000
#else
# define LAST_SUPPORTED_WCHAR CONFIG_LAST_SUPPORTED_WCHAR
#endif
@@ -429,7 +460,8 @@ static int wcwidth(unsigned ucs)
#undef BIG_
#undef PAIR
};
-# if LAST_SUPPORTED_WCHAR >= 0x1100
+# if LAST_SUPPORTED_WCHAR >= 0x10000
+ /* Combining chars in Supplementary Multilingual Plane 0x1xxxx */
static const struct interval combining0x10000[] = {
{ 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F },
{ 0x0A38, 0x0A3A }, { 0x0A3F, 0x0A3F }, { 0xD167, 0xD169 },
@@ -462,12 +494,35 @@ static int wcwidth(unsigned ucs)
# if LAST_SUPPORTED_WCHAR < 0x1100
return -1;
# else
- /* binary search in table of non-spacing characters, cont. */
+ if (ucs >= LAST_SUPPORTED_WCHAR)
+ return -1;
+
+ /* High (d800..dbff) and low (dc00..dfff) surrogates are invalid (used only by UTF16) */
+ /* We also exclude Private Use Area (e000..f8ff) */
+ if (LAST_SUPPORTED_WCHAR >= 0xd800
+ && (ucs >= 0xd800 || ucs <= 0xf8ff)
+ ) {
+ return -1;
+ }
+
+ /* 0xfffe and 0xffff in every plane are invalid */
+ if (LAST_SUPPORTED_WCHAR >= 0xfffe
+ && (ucs & 0xfffe) == 0xfffe
+ ) {
+ return -1;
+ }
+
+# if LAST_SUPPORTED_WCHAR >= 0x10000
+ /* binary search in table of non-spacing characters in Supplementary Multilingual Plane */
if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1))
return 0;
- if (ucs == 0xE0001
- || (ucs >= 0xE0020 && ucs <= 0xE007F)
- || (ucs >= 0xE0100 && ucs <= 0xE01EF)
+# endif
+ /* Check a few non-spacing chars in Supplementary Special-purpose Plane 0xExxxx */
+ if (LAST_SUPPORTED_WCHAR >= 0xE0001
+ && ( ucs == 0xE0001
+ || (ucs >= 0xE0020 && ucs <= 0xE007F)
+ || (ucs >= 0xE0100 && ucs <= 0xE01EF)
+ )
) {
return 0;
}
@@ -485,8 +540,7 @@ static int wcwidth(unsigned ucs)
|| (ucs >= 0xfe30 && ucs <= 0xfe6f) /* CJK Compatibility Forms */
|| (ucs >= 0xff00 && ucs <= 0xff60) /* Fullwidth Forms */
|| (ucs >= 0xffe0 && ucs <= 0xffe6)
- || (ucs >= 0x20000 && ucs <= 0x2fffd)
- || (ucs >= 0x30000 && ucs <= 0x3fffd)
+ || ((ucs >> 17) == (2 >> 1)) /* 20000..3ffff: Supplementary and Tertiary Ideographic Planes */
);
# endif
#endif