5 # WARNING: This must be kept in sync with the UTF8_MAXBYTES value in
7 $CHARSET_TRANSLATIONS::UTF_EBCDIC_MAXBYTES = 14;
9 # Utilities for various character set issues. Currently handles ASCII and
10 # EBCDIC only. It is trivial to add support for new EBCDIC code pages (unless
11 # they have identical variant character signatures as existing ones, and there
12 # aren't other glitches that arise): just add a mapping table to
13 # %ebcdic_translations and regen everything that uses this.
15 my %ebcdic_translations = (
16 # Keys are code page name; values are arrays that map ASCII ordinals to
17 # the code page's ordinals
20 [ 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
21 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
22 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
23 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
24 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
25 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
26 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
27 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
28 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
29 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF,
30 0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBB, 0xB4, 0x9A, 0x8A, 0xB0, 0xCA, 0xAF, 0xBC,
31 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
32 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
33 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xBA, 0xAE, 0x59,
34 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
35 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF
38 # 'EBCDIC POSIX-BC' =>
40 # 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
41 # 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
42 # 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
43 # 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
44 # 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
45 # 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xBB, 0xBC, 0xBD, 0x6A, 0x6D,
46 # 0x4A, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
47 # 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xFB, 0x4F, 0xFD, 0xFF, 0x07,
48 # 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
49 # 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0x5F,
50 # 0x41, 0xAA, 0xB0, 0xB1, 0x9F, 0xB2, 0xD0, 0xB5, 0x79, 0xB4, 0x9A, 0x8A, 0xBA, 0xCA, 0xAF, 0xA1,
51 # 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
52 # 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
53 # 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xE0, 0xFE, 0xDD, 0xFC, 0xAD, 0xAE, 0x59,
54 # 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
55 # 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xC0, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF
60 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F, 0x16, 0x05, 0x25, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
61 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26, 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
62 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
63 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
64 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
65 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xBA, 0xE0, 0xBB, 0xB0, 0x6D,
66 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
67 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
68 0x20, 0x21, 0x22, 0x23, 0x24, 0x15, 0x06, 0x17, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x09, 0x0A, 0x1B,
69 0x30, 0x31, 0x1A, 0x33, 0x34, 0x35, 0x36, 0x08, 0x38, 0x39, 0x3A, 0x3B, 0x04, 0x14, 0x3E, 0xFF,
70 0x41, 0xAA, 0x4A, 0xB1, 0x9F, 0xB2, 0x6A, 0xB5, 0xBD, 0xB4, 0x9A, 0x8A, 0x5F, 0xCA, 0xAF, 0xBC,
71 0x90, 0x8F, 0xEA, 0xFA, 0xBE, 0xA0, 0xB6, 0xB3, 0x9D, 0xDA, 0x9B, 0x8B, 0xB7, 0xB8, 0xB9, 0xAB,
72 0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9E, 0x68, 0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,
73 0xAC, 0x69, 0xED, 0xEE, 0xEB, 0xEF, 0xEC, 0xBF, 0x80, 0xFD, 0xFE, 0xFB, 0xFC, 0xAD, 0xAE, 0x59,
74 0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9C, 0x48, 0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,
75 0x8C, 0x49, 0xCD, 0xCE, 0xCB, 0xCF, 0xCC, 0xE1, 0x70, 0xDD, 0xDE, 0xDB, 0xDC, 0x8D, 0x8E, 0xDF
79 my $ascii_key = 'ASCII/Latin1';
81 my %I8_TO_NATIVE_UTF8; # Maps I8 UTF to final UTF-EBCDIC
82 # See http://www.unicode.org/reports/tr16/
84 sub get_supported_code_pages() {
85 # Returns an ordered array of the currently supported code pages,
86 # including ASCII as the 0th element, 1047 as the 1th, and the others
87 # sorted lexically by code page name.
89 # Create an ASCII table.
90 unless (exists $ebcdic_translations{$ascii_key}) {
91 for my $i (0 .. 255) {
92 $ebcdic_translations{$ascii_key}->[$i] = $i;
106 } keys %ebcdic_translations;
110 # Returns the mapping array for ASCII to code page for the code page named
111 # by the input parameter.
115 if (! exists $ebcdic_translations{$charset}) {
116 die "Unknown character set '$charset'";
119 return $ebcdic_translations{$charset};
122 sub get_I8_2_utf($) {
123 # Returns the mapping array for I8 to code page UTF-EBCDIC for the code
124 # page named by the input parameter. This is Table 2 of TR16 customized
125 # for the code page. See utfebcdic.h for why, contrary to TR16, it has to
126 # be code-page-specific.
130 die "I8 not a valid concept for ASCII" if $charset eq $ascii_key;
131 die "'$charset' unknown" unless exists $ebcdic_translations{$charset};
133 # Generate the table if not already present
134 if (! exists $I8_TO_NATIVE_UTF8{$charset}) {
136 # The code points not used for invariants. Initialized to everything,
137 # then entries are removed as we go along.
139 for my $i (0 .. 255) {
143 # These are the invariants. The output has them mapped to the
144 # original EBCDIC code point.
145 for my $i (0 .. 0x9F) {
147 my $ebcdic_value = $ebcdic_translations{$charset}[$i];
148 #printf "$charset: using %02x which is %02x ascii, %s\n", $ebcdic_value, $i, charnames::viacode($i);
149 $I8_TO_NATIVE_UTF8{$charset}[$i] = $ebcdic_value;
150 if (! defined delete $unused_cps{$ebcdic_value}) {
151 die "Two code points map to $ebcdic_value; one is $i";
155 # Put the unused code points in order
156 my @unused_cps = sort { $a <=> $b } keys %unused_cps;
158 # Fill in the rest of the map with these ordered code points, as TR16
160 for my $i (0xA0 .. 255) {
161 $I8_TO_NATIVE_UTF8{$charset}[$i] = shift @unused_cps;
162 #printf "$charset: filling in %02x which is %02x ascii, %s\n", $I8_TO_NATIVE_UTF8{$charset}[$i], $i, charnames::viacode($i);
166 die "Left-over code points";
170 return $I8_TO_NATIVE_UTF8{$charset};
175 my $charset; # We use these to do some error checking that the #if and
176 # #endif are matched.
179 sub get_conditional_compile_line_start($;$) {
180 # Returns the '#if' line to put into C code to compile for the code
181 # page given by the first parameter. The second parameter, if
182 # present, is the indentation level, like '# if ...'
184 if (defined $charset || defined $indent) {
185 die "Missing call to get_conditional_compile_line_end()"
189 my $indent_level = shift // 0;
191 die "This is designed to run only on an ASCII platform" unless ord "A" == 65;
193 if ($indent_level == 0) {
197 $indent = " " x $indent_level;
200 die "Unknown character set '$charset'" unless exists $ebcdic_translations{$charset};
207 # We use all the typical variant characters to construct the #if,
208 # so that it is unlikely that a different code page will match
210 for my $char (qw/A \\\ [ ] { } ^ ~ ! # | $ @ `/) {
212 my $ascii_ord = ord $char;
213 my $first_time = $return eq "";
215 $compare = $ebcdic_translations{$charset}[$ascii_ord];
216 $return .= " && " unless $first_time;
217 $return .= "'$char' == $compare";
218 $return .= " /* $charset */" if $first_time;
219 last if $charset eq $ascii_key;
221 $return .= " \\\n " if $first_time || $count % 5 == 0;
225 return "#${indent}if $return\n";
228 sub get_conditional_compile_line_end () {
229 # Returns the #endif for the currently open #if
231 my $return = "#${indent}endif\t/* $charset */\n";
238 sub _UTF_START_MASK($) {
241 return (($len >= 7) ? 0x00 : (0x1F >> ($len - 2)));
244 sub _UTF_START_MARK($) {
247 return (($len > 7) ? 0xFF : (0xFF & (0xFE << (7- $len))));
250 sub cp_2_utfbytes($$) {
251 # Returns a string consisting of the UTF-EBCDIC for the code page given by
252 # the 2nd parameter, of the Unicode code point given by the first
253 # parameter, using the UTF-MOD algorithm published in TR16. (If the "code
254 # page" is ASCII, straight UTF-8 is returned.)
256 my ($ucp, $charset) = @_;
258 if ($charset eq $ascii_key) {
264 elsif (exists $ebcdic_translations{$charset}) {
267 return chr $ebcdic_translations{$charset}[$ucp];
270 my $I8_2_utf = get_I8_2_utf($charset);
272 my $len = $ucp < 0xA0 ? 1 :
276 $ucp < 0x400000 ? 5 :
277 $ucp < 0x4000000 ? 6 :
278 $ucp < 0x40000000? 7 :
279 $CHARSET_TRANSLATIONS::UTF_EBCDIC_MAXBYTES;
282 for (1 .. $len - 1) {
283 unshift @str, chr $I8_2_utf->[($ucp & 0x1f) | 0xA0];
287 unshift @str, chr $I8_2_utf->[($ucp & _UTF_START_MASK($len)) | _UTF_START_MARK($len)];
289 return join "", @str;
292 die "Unknown character set '$charset'";