unicode: exclude FDD0..FDEF range too

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/unicode_wcwidth.c

@@ -90,13 +90,13 @@
  * until Unicode committee assigns something there.
  */
 
-#if CONFIG_LAST_SUPPORTED_WCHAR < 126 || CONFIG_LAST_SUPPORTED_WCHAR > 0x30000
+#if CONFIG_LAST_SUPPORTED_WCHAR < 126 || CONFIG_LAST_SUPPORTED_WCHAR >= 0x30000
-# define LAST_SUPPORTED_WCHAR 0x30000
+# define LAST_SUPPORTED_WCHAR 0x2ffff
 #else
 # define LAST_SUPPORTED_WCHAR CONFIG_LAST_SUPPORTED_WCHAR
 #endif
 
-#if LAST_SUPPORTED_WCHAR >= 0x0300
+#if LAST_SUPPORTED_WCHAR >= 0x300
 struct interval {
 	uint16_t first;
 	uint16_t last;
@@ -185,7 +185,7 @@ static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
  */
 static int wcwidth(unsigned ucs)
 {
-#if LAST_SUPPORTED_WCHAR >= 0x0300
+#if LAST_SUPPORTED_WCHAR >= 0x300
 	/* sorted list of non-overlapping intervals of non-spacing characters */
 	/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
 	static const struct interval combining[] = {
@@ -460,7 +460,50 @@ static int wcwidth(unsigned ucs)
 #undef BIG_
 #undef PAIR
 	};
+#endif
+
+	if (ucs == 0)
+		return 0;
+
+	/* Test for 8-bit control characters (00-1f, 80-9f, 7f) */
+	if ((ucs & ~0x80) < 0x20 || ucs == 0x7f)
+		return -1;
+	/* Quick abort if it is an obviously invalid char */
+	if (ucs > LAST_SUPPORTED_WCHAR)
+		return -1;
+
+	/* Optimization: no combining chars below 0x300 */
+	if (LAST_SUPPORTED_WCHAR < 0x300 || ucs < 0x300)
+		return 1;
+
+#if LAST_SUPPORTED_WCHAR >= 0x300
+	/* Binary search in table of non-spacing characters */
+	if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1))
+		return 0;
+	if (in_uint16_table(ucs, combining1, ARRAY_SIZE(combining1) - 1))
+		return 0;
+
+	/* Optimization: all chars below 0x1100 are not double-width */
+	if (LAST_SUPPORTED_WCHAR < 0x1100 || ucs < 0x1100)
+		return 1;
+
+# if LAST_SUPPORTED_WCHAR >= 0x1100
+	/* Invalid code points: */
+	/* High (d800..dbff) and low (dc00..dfff) surrogates (valid only in UTF16) */
+	/* Private Use Area (e000..f8ff) */
+	/* Noncharacters fdd0..fdef */
+	if ((LAST_SUPPORTED_WCHAR >= 0xd800 && ucs >= 0xd800 && ucs <= 0xf8ff)
+	 || (LAST_SUPPORTED_WCHAR >= 0xfdd0 && ucs >= 0xfdd0 && ucs <= 0xfdef)
+	) {
+		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
+	if (ucs >= 0x10000) {
 		/* Combining chars in Supplementary Multilingual Plane 0x1xxxx */
 		static const struct interval combining0x10000[] = {
 			{ 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F },
@@ -468,55 +511,9 @@ static int wcwidth(unsigned ucs)
 			{ 0xD173, 0xD182 }, { 0xD185, 0xD18B }, { 0xD1AA, 0xD1AD },
 			{ 0xD242, 0xD244 }
 		};
-# endif
+		/* Binary search in table of non-spacing characters in Supplementary Multilingual Plane */
-#endif
-
-	if (ucs == 0)
-		return 0;
-	/* test for 8-bit control characters (00-1f, 80-9f, 7f) */
-	if ((ucs & ~0x80) < 0x20 || ucs == 0x7f)
-		return -1;
-	if (ucs < 0x0300) /* optimization */
-		return 1;
-
-#if LAST_SUPPORTED_WCHAR < 0x0300
-	return -1;
-#else
-	/* binary search in table of non-spacing characters */
-	if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1))
-		return 0;
-	if (in_uint16_table(ucs, combining1, ARRAY_SIZE(combining1) - 1))
-		return 0;
-
-	if (ucs < 0x1100) /* optimization */
-		return 1;
-
-# if LAST_SUPPORTED_WCHAR < 0x1100
-	return -1;
-# else
-	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;
-#  endif
 		/* Check a few non-spacing chars in Supplementary Special-purpose Plane 0xExxxx */
 		if (LAST_SUPPORTED_WCHAR >= 0xE0001
 		 && (  ucs == 0xE0001
@@ -526,9 +523,12 @@ static int wcwidth(unsigned ucs)
 		) {
 			return 0;
 		}
+	}
+#  endif
 
-	/* if we arrive here, ucs is not a combining or C0/C1 control character */
+	/* If we arrive here, ucs is not a combining or C0/C1 control character.
-
+	 * Check whether it's 1 char or 2-shar wide.
+	 */
 	return 1 +
 		(  (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */
 		|| ucs == 0x2329 /* left-pointing angle bracket; also CJK punct. char */

testsuite/ls.tests

@@ -13,7 +13,7 @@ mkdir ls.testdir || exit 1
 
 # With Unicode provided by libc locale, I'm not sure this test can pass.
 # I suspect we might fail to skip exactly correct number of bytes
-# over broken unicode sequences.
+# over broked unicode sequences.
 test x"$CONFIG_FEATURE_ASSUME_UNICODE" = x"y" \
 && test x"$CONFIG_LOCALE_SUPPORT" != x"y" \
 && test x"$CONFIG_SUBST_WCHAR" = x"63" \
@@ -144,7 +144,7 @@ test x"$CONFIG_FEATURE_ASSUME_UNICODE" = x"y" \
 0003_2.1__First_possible_sequence_of_a_certain_length_____________________|
 0004_2.1.2__2_bytes__U-00000080_:________"?"______________________________|
 0005_2.1.3__3_bytes__U-00000800_:________"ࠀ"______________________________|
-0006_2.1.4__4_bytes__U-00010000_:________"?"______________________________|
+0006_2.1.4__4_bytes__U-00010000_:________"𐀀"______________________________|
 0007_2.1.5__5_bytes__U-00200000_:________"?"______________________________|
 0008_2.1.6__6_bytes__U-04000000_:________"?"______________________________|
 0009_2.2__Last_possible_sequence_of_a_certain_length______________________|
@@ -155,9 +155,9 @@ test x"$CONFIG_FEATURE_ASSUME_UNICODE" = x"y" \
 0014_2.2.5__5_bytes__U-03FFFFFF_:________"?"______________________________|
 0015_2.2.6__6_bytes__U-7FFFFFFF_:________"?"______________________________|
 0016_2.3__Other_boundary_conditions_______________________________________|
-0017_2.3.1__U-0000D7FF_=_ed_9f_bf_=_"?"___________________________________|
+0017_2.3.1__U-0000D7FF_=_ed_9f_bf_=_"퟿"___________________________________|
 0018_2.3.2__U-0000E000_=_ee_80_80_=_"?"___________________________________|
-0019_2.3.3__U-0000FFFD_=_ef_bf_bd_=_"?"___________________________________|
+0019_2.3.3__U-0000FFFD_=_ef_bf_bd_=_"<EFBFBD>"___________________________________|
 0020_2.3.4__U-0010FFFF_=_f4_8f_bf_bf_=_"?"________________________________|
 0021_2.3.5__U-00110000_=_f4_90_80_80_=_"?"________________________________|
 0022_3__Malformed_sequences_______________________________________________|