exclude more invalid unicode chars

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

2 files changed, 183 insertions, 10 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
diff --git a/testsuite/ls.tests b/testsuite/ls.tests
index 60f3eb50f..e08249ea6 100755
--- a/testsuite/ls.tests
+++ b/testsuite/ls.tests
@@ -18,7 +18,7 @@ test x"$CONFIG_FEATURE_ASSUME_UNICODE" = x"y" \
 && test x"$CONFIG_LOCALE_SUPPORT" != x"y" \
 && test x"$CONFIG_SUBST_WCHAR" = x"63" \
 && test x"$CONFIG_LAST_SUPPORTED_WCHAR" = x"767" \
-&& testing "ls unicode test" \
+&& testing "ls unicode test with codepoints limited to 767" \
 "(cd ls.testdir && sh ../ls.mk_uni_tests) && ls -1 ls.testdir" \
 '0001_1__Some_correct_UTF-8_text___________________________________________|
 0002_2__Boundary_condition_test_cases_____________________________________|
@@ -132,6 +132,125 @@ test x"$CONFIG_FEATURE_ASSUME_UNICODE" = x"y" \
 0110_5.3.2__U+FFFF_=_ef_bf_bf_=_"?"_______________________________________|
 ' "" ""
 
+# Currently fails on "0080_4.2.2__U-000007FF_=_e0_9f_bf" line
+test x"$CONFIG_FEATURE_ASSUME_UNICODE" = x"y" \
+&& test x"$CONFIG_LOCALE_SUPPORT" != x"y" \
+&& test x"$CONFIG_SUBST_WCHAR" = x"63" \
+&& test x"$CONFIG_LAST_SUPPORTED_WCHAR" = x"0" \
+&& testing "ls unicode test with unlimited codepoints" \
+"(cd ls.testdir && sh ../ls.mk_uni_tests) && ls -1 ls.testdir" \
+'0001_1__Some_correct_UTF-8_text___________________________________________|
+0002_2__Boundary_condition_test_cases_____________________________________|
+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_:________"?"______________________________|
+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______________________|
+0010_2.2.1__1_byte___U-0000007F_:________"?"______________________________|
+0011_2.2.2__2_bytes__U-000007FF_:________"߿"______________________________|
+0012_2.2.3__3_bytes__U-0000FFFF_:________"?"______________________________|
+0013_2.2.4__4_bytes__U-001FFFFF_:________"?"______________________________|
+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_=_"?"___________________________________|
+0018_2.3.2__U-0000E000_=_ee_80_80_=_"?"___________________________________|
+0019_2.3.3__U-0000FFFD_=_ef_bf_bd_=_"?"___________________________________|
+0020_2.3.4__U-0010FFFF_=_f4_8f_bf_bf_=_"?"________________________________|
+0021_2.3.5__U-00110000_=_f4_90_80_80_=_"?"________________________________|
+0022_3__Malformed_sequences_______________________________________________|
+0023_3.1__Unexpected_continuation_bytes___________________________________|
+0024_3.1.1__First_continuation_byte_0x80:_"?"_____________________________|
+0025_3.1.2__Last__continuation_byte_0xbf:_"?"_____________________________|
+0026_3.1.3__2_continuation_bytes:_"??"____________________________________|
+0027_3.1.4__3_continuation_bytes:_"???"___________________________________|
+0028_3.1.5__4_continuation_bytes:_"????"__________________________________|
+0029_3.1.6__5_continuation_bytes:_"?????"_________________________________|
+0030_3.1.7__6_continuation_bytes:_"??????"________________________________|
+0031_3.1.8__7_continuation_bytes:_"???????"_______________________________|
+0032_3.1.9__Sequence_of_all_64_possible_continuation_bytes__0x80-0xbf_:___|
+0033____"????????????????_________________________________________________|
+0034_____????????????????_________________________________________________|
+0035_____????????????????_________________________________________________|
+0036_____????????????????"________________________________________________|
+0037_3.2__Lonely_start_characters_________________________________________|
+0038_3.2.1__All_32_first_bytes_of_2-byte_sequences__0xc0-0xdf_,___________|
+0039________each_followed_by_a_space_character:___________________________|
+0040____"?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?__________________________________|
+0041_____?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_"________________________________|
+0042_3.2.2__All_16_first_bytes_of_3-byte_sequences__0xe0-0xef_,___________|
+0043________each_followed_by_a_space_character:___________________________|
+0044____"?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_?_"________________________________|
+0045_3.2.3__All_8_first_bytes_of_4-byte_sequences__0xf0-0xf7_,____________|
+0046________each_followed_by_a_space_character:___________________________|
+0047____"?_?_?_?_?_?_?_?_"________________________________________________|
+0048_3.2.4__All_4_first_bytes_of_5-byte_sequences__0xf8-0xfb_,____________|
+0049________each_followed_by_a_space_character:___________________________|
+0050____"?_?_?_?_"________________________________________________________|
+0051_3.2.5__All_2_first_bytes_of_6-byte_sequences__0xfc-0xfd_,____________|
+0052________each_followed_by_a_space_character:___________________________|
+0053____"?_?_"____________________________________________________________|
+0054_3.3__Sequences_with_last_continuation_byte_missing___________________|
+0055_3.3.1__2-byte_sequence_with_last_byte_missing__U+0000_:_____"?"______|
+0056_3.3.2__3-byte_sequence_with_last_byte_missing__U+0000_:_____"?"______|
+0057_3.3.3__4-byte_sequence_with_last_byte_missing__U+0000_:_____"?"______|
+0058_3.3.4__5-byte_sequence_with_last_byte_missing__U+0000_:_____"?"______|
+0059_3.3.5__6-byte_sequence_with_last_byte_missing__U+0000_:_____"?"______|
+0060_3.3.6__2-byte_sequence_with_last_byte_missing__U-000007FF_:_"?"______|
+0061_3.3.7__3-byte_sequence_with_last_byte_missing__U-0000FFFF_:_"?"______|
+0062_3.3.8__4-byte_sequence_with_last_byte_missing__U-001FFFFF_:_"?"______|
+0063_3.3.9__5-byte_sequence_with_last_byte_missing__U-03FFFFFF_:_"?"______|
+0064_3.3.10_6-byte_sequence_with_last_byte_missing__U-7FFFFFFF_:_"?"______|
+0065_3.4__Concatenation_of_incomplete_sequences___________________________|
+0066____"??????????"______________________________________________________|
+0067_3.5__Impossible_bytes________________________________________________|
+0068_3.5.1__fe_=_"?"______________________________________________________|
+0069_3.5.2__ff_=_"?"______________________________________________________|
+0070_3.5.3__fe_fe_ff_ff_=_"????"__________________________________________|
+0071_4__Overlong_sequences________________________________________________|
+0072_4.1__Examples_of_an_overlong_ASCII_character_________________________|
+0073_4.1.1_U+002F_=_c0_af_____________=_"?"_______________________________|
+0074_4.1.2_U+002F_=_e0_80_af__________=_"?"_______________________________|
+0075_4.1.3_U+002F_=_f0_80_80_af_______=_"?"_______________________________|
+0076_4.1.4_U+002F_=_f8_80_80_80_af____=_"?"_______________________________|
+0077_4.1.5_U+002F_=_fc_80_80_80_80_af_=_"?"_______________________________|
+0078_4.2__Maximum_overlong_sequences______________________________________|
+0079_4.2.1__U-0000007F_=_c1_bf_____________=_"?"__________________________|
+0080_4.2.2__U-000007FF_=_e0_9f_bf__________=_"?"__________________________|
+0081_4.2.3__U-0000FFFF_=_f0_8f_bf_bf_______=_"?"__________________________|
+0082_4.2.4__U-001FFFFF_=_f8_87_bf_bf_bf____=_"?"__________________________|
+0083_4.2.5__U-03FFFFFF_=_fc_83_bf_bf_bf_bf_=_"?"__________________________|
+0084_4.3__Overlong_representation_of_the_NUL_character____________________|
+0085_4.3.1__U+0000_=_c0_80_____________=_"?"______________________________|
+0086_4.3.2__U+0000_=_e0_80_80__________=_"?"______________________________|
+0087_4.3.3__U+0000_=_f0_80_80_80_______=_"?"______________________________|
+0088_4.3.4__U+0000_=_f8_80_80_80_80____=_"?"______________________________|
+0089_4.3.5__U+0000_=_fc_80_80_80_80_80_=_"?"______________________________|
+0090_5__Illegal_code_positions____________________________________________|
+0091_5.1_Single_UTF-16_surrogates_________________________________________|
+0092_5.1.1__U+D800_=_ed_a0_80_=_"?"_______________________________________|
+0093_5.1.2__U+DB7F_=_ed_ad_bf_=_"?"_______________________________________|
+0094_5.1.3__U+DB80_=_ed_ae_80_=_"?"_______________________________________|
+0095_5.1.4__U+DBFF_=_ed_af_bf_=_"?"_______________________________________|
+0096_5.1.5__U+DC00_=_ed_b0_80_=_"?"_______________________________________|
+0097_5.1.6__U+DF80_=_ed_be_80_=_"?"_______________________________________|
+0098_5.1.7__U+DFFF_=_ed_bf_bf_=_"?"_______________________________________|
+0099_5.2_Paired_UTF-16_surrogates_________________________________________|
+0100_5.2.1__U+D800_U+DC00_=_ed_a0_80_ed_b0_80_=_"??"______________________|
+0101_5.2.2__U+D800_U+DFFF_=_ed_a0_80_ed_bf_bf_=_"??"______________________|
+0102_5.2.3__U+DB7F_U+DC00_=_ed_ad_bf_ed_b0_80_=_"??"______________________|
+0103_5.2.4__U+DB7F_U+DFFF_=_ed_ad_bf_ed_bf_bf_=_"??"______________________|
+0104_5.2.5__U+DB80_U+DC00_=_ed_ae_80_ed_b0_80_=_"??"______________________|
+0105_5.2.6__U+DB80_U+DFFF_=_ed_ae_80_ed_bf_bf_=_"??"______________________|
+0106_5.2.7__U+DBFF_U+DC00_=_ed_af_bf_ed_b0_80_=_"??"______________________|
+0107_5.2.8__U+DBFF_U+DFFF_=_ed_af_bf_ed_bf_bf_=_"??"______________________|
+0108_5.3_Other_illegal_code_positions_____________________________________|
+0109_5.3.1__U+FFFE_=_ef_bf_be_=_"?"_______________________________________|
+0110_5.3.2__U+FFFF_=_ef_bf_bf_=_"?"_______________________________________|
+' "" ""
+
 # Clean up
 rm -rf ls.testdir 2>/dev/null