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elinks/src/intl/charsets.c
Witold Filipczyk 3d96b0d7d7 Revert "Compile with C++."
This reverts commit 4f4df33638.
2019-04-21 12:27:40 +02:00

1674 lines
42 KiB
C

/* Charsets convertor */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* strcasecmp() */
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_LANGINFO_CODESET
#include <langinfo.h>
#endif
#include <ctype.h>
#include <stdlib.h>
#if HAVE_WCTYPE_H
#include <wctype.h>
#endif
#ifdef HAVE_ICONV
#include <errno.h>
#include <iconv.h>
#endif
#include "elinks.h"
#include "document/options.h"
#include "intl/charsets.h"
#include "util/conv.h"
#include "util/error.h"
#include "util/fastfind.h"
#include "util/hash.h"
#include "util/memory.h"
#include "util/string.h"
/* Fix namespace clash on MacOS. */
#define table table_elinks
struct table_entry {
unsigned char c;
/* This should in principle be unicode_val_T, but because all
* the values currently in codepage.inc fit in 16 bits, we can
* as well use uint16_t and halve sizeof(struct table_entry)
* from 8 bytes to 4. Should other characters ever be needed,
* unicode_val_T u : 24 might be a possibility, although it
* seems a little unportable as bitfields are in principle
* restricted to int, which may be 16-bit. */
uint16_t u;
};
struct codepage_desc {
unsigned char *name;
unsigned char *const *aliases;
/* The Unicode mappings of codepage bytes 0x80...0xFF.
* (0x00...0x7F are assumed to be ASCII in all codepages.)
* Because all current values fit in 16 bits, we store them as
* uint16_t rather than unicode_val_T. If the codepage does
* not use some byte, then @highhalf maps that byte to 0xFFFF,
* which C code converts to UCS_REPLACEMENT_CHARACTER where
* appropriate. (U+FFFF is reserved and will never be
* assigned as a character.) */
const uint16_t *highhalf;
/* If some byte in the codepage corresponds to multiple Unicode
* characters, then the preferred character is in @highhalf
* above, and the rest are listed here in @table. This table
* is not used for translating from the codepage to Unicode. */
const struct table_entry *table;
/* Whether use iconv for translation */
unsigned int iconv:1;
};
#include "intl/codepage.inc"
#include "intl/uni_7b.inc"
#include "intl/entity.inc"
/* Declare the external-linkage inline functions defined in this file.
* Avoid the GCC 4.3.1 warning: `foo' declared inline after being
* called. The functions are not declared inline in charsets.h
* because C99 6.7.4p6 says that every external-linkage function
* declared inline shall be defined in the same translation unit.
* The non-inline declarations in charsets.h also make sure that the
* compiler emits global definitions for the symbols so that the
* functions can be called from other translation units. */
NONSTATIC_INLINE unsigned char *encode_utf8(unicode_val_T u);
NONSTATIC_INLINE int utf8charlen(const unsigned char *p);
NONSTATIC_INLINE int unicode_to_cell(unicode_val_T c);
NONSTATIC_INLINE unicode_val_T utf8_to_unicode(unsigned char **string,
const unsigned char *end);
static const char strings[256][2] = {
"\000", "\001", "\002", "\003", "\004", "\005", "\006", "\007",
"\010", "\011", "\012", "\013", "\014", "\015", "\016", "\017",
"\020", "\021", "\022", "\023", "\024", "\025", "\026", "\033",
"\030", "\031", "\032", "\033", "\034", "\035", "\036", "\033",
"\040", "\041", "\042", "\043", "\044", "\045", "\046", "\047",
"\050", "\051", "\052", "\053", "\054", "\055", "\056", "\057",
"\060", "\061", "\062", "\063", "\064", "\065", "\066", "\067",
"\070", "\071", "\072", "\073", "\074", "\075", "\076", "\077",
"\100", "\101", "\102", "\103", "\104", "\105", "\106", "\107",
"\110", "\111", "\112", "\113", "\114", "\115", "\116", "\117",
"\120", "\121", "\122", "\123", "\124", "\125", "\126", "\127",
"\130", "\131", "\132", "\133", "\134", "\135", "\136", "\137",
"\140", "\141", "\142", "\143", "\144", "\145", "\146", "\147",
"\150", "\151", "\152", "\153", "\154", "\155", "\156", "\157",
"\160", "\161", "\162", "\163", "\164", "\165", "\166", "\167",
"\170", "\171", "\172", "\173", "\174", "\175", "\176", "\177",
"\200", "\201", "\202", "\203", "\204", "\205", "\206", "\207",
"\210", "\211", "\212", "\213", "\214", "\215", "\216", "\217",
"\220", "\221", "\222", "\223", "\224", "\225", "\226", "\227",
"\230", "\231", "\232", "\233", "\234", "\235", "\236", "\237",
"\240", "\241", "\242", "\243", "\244", "\245", "\246", "\247",
"\250", "\251", "\252", "\253", "\254", "\255", "\256", "\257",
"\260", "\261", "\262", "\263", "\264", "\265", "\266", "\267",
"\270", "\271", "\272", "\273", "\274", "\275", "\276", "\277",
"\300", "\301", "\302", "\303", "\304", "\305", "\306", "\307",
"\310", "\311", "\312", "\313", "\314", "\315", "\316", "\317",
"\320", "\321", "\322", "\323", "\324", "\325", "\326", "\327",
"\330", "\331", "\332", "\333", "\334", "\335", "\336", "\337",
"\340", "\341", "\342", "\343", "\344", "\345", "\346", "\347",
"\350", "\351", "\352", "\353", "\354", "\355", "\356", "\357",
"\360", "\361", "\362", "\363", "\364", "\365", "\366", "\367",
"\370", "\371", "\372", "\373", "\374", "\375", "\376", "\377",
};
#ifdef HAVE_ICONV
static iconv_t iconv_cd = (iconv_t)-1;
#endif
static void
free_translation_table(struct conv_table *p)
{
int i;
for (i = 0; i < 256; i++)
if (p[i].t)
free_translation_table(p[i].u.tbl);
mem_free(p);
}
/* A string used in conversion tables when there is no correct
* conversion. This is compared by address and therefore should be a
* named array rather than a pointer so that it won't share storage
* with any other string literal that happens to have the same
* characters. */
static const unsigned char no_str[] = "*";
static void
new_translation_table(struct conv_table *p)
{
int i;
for (i = 0; i < 256; i++)
if (p[i].t)
free_translation_table(p[i].u.tbl);
for (i = 0; i < 128; i++) {
p[i].t = 0;
p[i].u.str = strings[i];
}
for (; i < 256; i++) {
p[i].t = 0;
p[i].u.str = no_str;
}
p->iconv_cp = -1;
}
#define BIN_SEARCH(table, entry, entries, key, result) \
{ \
long _s = 0, _e = (entries) - 1; \
\
while (_s <= _e || !((result) = -1)) { \
long _m = (_s + _e) / 2; \
\
if ((table)[_m].entry == (key)) { \
(result) = _m; \
break; \
} \
if ((table)[_m].entry > (key)) _e = _m - 1; \
if ((table)[_m].entry < (key)) _s = _m + 1; \
} \
} \
static const unicode_val_T strange_chars[32] = {
0x20ac, 0x0000, 0x002a, 0x0000, 0x201e, 0x2026, 0x2020, 0x2021,
0x005e, 0x2030, 0x0160, 0x003c, 0x0152, 0x0000, 0x0000, 0x0000,
0x0000, 0x0060, 0x0027, 0x0022, 0x0022, 0x002a, 0x2013, 0x2014,
0x007e, 0x2122, 0x0161, 0x003e, 0x0153, 0x0000, 0x0000, 0x0000,
};
#define SYSTEM_CHARSET_FLAG 128
#define is_cp_ptr_utf8(cp_ptr) ((cp_ptr)->aliases == aliases_utf8)
const unsigned char *
u2cp_(unicode_val_T u, int to, enum nbsp_mode nbsp_mode)
{
int j;
int s;
if (u < 128) return strings[u];
if (u < 0xa0) {
u = strange_chars[u - 0x80];
if (!u) return NULL;
}
to &= ~SYSTEM_CHARSET_FLAG;
if (is_cp_ptr_utf8(&codepages[to]))
return encode_utf8(u);
/* To mark non breaking spaces in non-UTF-8 strings, we use a
* special char NBSP_CHAR. */
if (u == UCS_NO_BREAK_SPACE) {
if (nbsp_mode == NBSP_MODE_HACK) return NBSP_CHAR_STRING;
else /* NBSP_MODE_ASCII */ return " ";
}
if (u == UCS_SOFT_HYPHEN) return "";
if (u < 0xFFFF)
for (j = 0; j < 0x80; j++)
if (codepages[to].highhalf[j] == u)
return strings[0x80 + j];
for (j = 0; codepages[to].table[j].c; j++)
if (codepages[to].table[j].u == u)
return strings[codepages[to].table[j].c];
BIN_SEARCH(unicode_7b, x, N_UNICODE_7B, u, s);
if (s != -1) return unicode_7b[s].s;
return no_str;
}
static unsigned char utf_buffer[7];
NONSTATIC_INLINE unsigned char *
encode_utf8(unicode_val_T u)
{
memset(utf_buffer, 0, 7);
if (u < 0x80)
utf_buffer[0] = u;
else if (u < 0x800)
utf_buffer[0] = 0xc0 | ((u >> 6) & 0x1f),
utf_buffer[1] = 0x80 | (u & 0x3f);
else if (u < 0x10000)
utf_buffer[0] = 0xe0 | ((u >> 12) & 0x0f),
utf_buffer[1] = 0x80 | ((u >> 6) & 0x3f),
utf_buffer[2] = 0x80 | (u & 0x3f);
else if (u < 0x200000)
utf_buffer[0] = 0xf0 | ((u >> 18) & 0x0f),
utf_buffer[1] = 0x80 | ((u >> 12) & 0x3f),
utf_buffer[2] = 0x80 | ((u >> 6) & 0x3f),
utf_buffer[3] = 0x80 | (u & 0x3f);
else if (u < 0x4000000)
utf_buffer[0] = 0xf8 | ((u >> 24) & 0x0f),
utf_buffer[1] = 0x80 | ((u >> 18) & 0x3f),
utf_buffer[2] = 0x80 | ((u >> 12) & 0x3f),
utf_buffer[3] = 0x80 | ((u >> 6) & 0x3f),
utf_buffer[4] = 0x80 | (u & 0x3f);
else utf_buffer[0] = 0xfc | ((u >> 30) & 0x01),
utf_buffer[1] = 0x80 | ((u >> 24) & 0x3f),
utf_buffer[2] = 0x80 | ((u >> 18) & 0x3f),
utf_buffer[3] = 0x80 | ((u >> 12) & 0x3f),
utf_buffer[4] = 0x80 | ((u >> 6) & 0x3f),
utf_buffer[5] = 0x80 | (u & 0x3f);
return utf_buffer;
}
/* Number of bytes utf8 character indexed by first byte. Illegal bytes are
* equal ones and handled different. */
static const char utf8char_len_tab[256] = {
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,
3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 5,5,5,5,6,6,1,1,
};
#ifdef CONFIG_UTF8
NONSTATIC_INLINE int
utf8charlen(const unsigned char *p)
{
return p ? utf8char_len_tab[*p] : 0;
}
int
strlen_utf8(unsigned char **str)
{
unsigned char *s = *str;
unsigned char *end = strchr((const char *)s, '\0');
int x;
int len;
for (x = 0;; x++, s += len) {
len = utf8charlen(s);
if (s + len > end) break;
}
*str = s;
return x;
}
#define utf8_issingle(p) (((p) & 0x80) == 0)
#define utf8_islead(p) (utf8_issingle(p) || ((p) & 0xc0) == 0xc0)
/* Start from @current and move back to @pos char. This pointer return. The
* most left pointer is @start. */
unsigned char *
utf8_prevchar(unsigned char *current, int pos, unsigned char *start)
{
if (current == NULL || start == NULL || pos < 0)
return NULL;
while (pos > 0 && current != start) {
current--;
if (utf8_islead(*current))
pos--;
}
return current;
}
/* Count number of standard terminal cells needed for displaying UTF-8
* character. */
int
utf8_char2cells(unsigned char *utf8_char, unsigned char *end)
{
unicode_val_T u;
if (end == NULL)
end = strchr((const char *)utf8_char, '\0');
if(!utf8_char || !end)
return -1;
u = utf8_to_unicode(&utf8_char, end);
return unicode_to_cell(u);
}
/* Count number of standard terminal cells needed for displaying string
* with UTF-8 characters. */
int
utf8_ptr2cells(unsigned char *string, unsigned char *end)
{
int charlen, cell, cells = 0;
if (end == NULL)
end = strchr((const char *)string, '\0');
if(!string || !end)
return -1;
do {
charlen = utf8charlen(string);
if (string + charlen > end)
break;
cell = utf8_char2cells(string, end);
if (cell < 0)
return -1;
cells += cell;
string += charlen;
} while (1);
return cells;
}
/* Count number of characters in string. */
int
utf8_ptr2chars(unsigned char *string, unsigned char *end)
{
int charlen, chars = 0;
if (end == NULL)
end = strchr((const char *)string, '\0');
if(!string || !end)
return -1;
do {
charlen = utf8charlen(string);
if (string + charlen > end)
break;
chars++;
string += charlen;
} while (1);
return chars;
}
/*
* Count number of bytes from begining of the string needed for displaying
* specified number of cells.
*/
int
utf8_cells2bytes(unsigned char *string, int max_cells, unsigned char *end)
{
unsigned int bytes = 0, cells = 0;
assert(max_cells>=0);
if (end == NULL)
end = strchr((const char *)string, '\0');
if(!string || !end)
return -1;
do {
int cell = utf8_char2cells(&string[bytes], end);
if (cell < 0)
return -1;
cells += cell;
if (cells > max_cells)
break;
bytes += utf8charlen(&string[bytes]);
if (string + bytes > end) {
bytes = end - string;
break;
}
} while(1);
return bytes;
}
/* Take @max steps forward from @string in the specified @way, but
* not going past @end. Return the resulting address. Store the
* number of steps taken to *@count, unless @count is NULL.
*
* This assumes the text is valid UTF-8, and @string and @end point to
* character boundaries. If not, it doesn't crash but the results may
* be inconsistent.
*
* This function can do some of the same jobs as utf8charlen(),
* utf8_cells2bytes(), and strlen_utf8(). */
unsigned char *
utf8_step_forward(unsigned char *string, unsigned char *end,
int max, enum utf8_step way, int *count)
{
int steps = 0;
unsigned char *current = string;
assert(string);
assert(max >= 0);
if_assert_failed goto invalid_arg;
if (end == NULL)
end = strchr((const char *)string, '\0');
switch (way) {
case UTF8_STEP_CHARACTERS:
while (steps < max && current < end) {
++current;
if (utf8_islead(*current))
++steps;
}
break;
case UTF8_STEP_CELLS_FEWER:
case UTF8_STEP_CELLS_MORE:
while (steps < max && current < end) {
unicode_val_T u;
unsigned char *prev = current;
int width;
u = utf8_to_unicode(&current, end);
if (u == UCS_NO_CHAR) {
/* Assume the incomplete sequence
* costs one cell. */
current = end;
++steps;
break;
}
width = unicode_to_cell(u);
if (way == UTF8_STEP_CELLS_FEWER
&& steps + width > max) {
/* Back off. */
current = prev;
break;
}
steps += width;
}
break;
default:
INTERNAL("impossible enum utf8_step");
}
invalid_arg:
if (count)
*count = steps;
return current;
}
/* Take @max steps backward from @string in the specified @way, but
* not going past @start. Return the resulting address. Store the
* number of steps taken to *@count, unless @count is NULL.
*
* This assumes the text is valid UTF-8, and @string and @start point
* to character boundaries. If not, it doesn't crash but the results
* may be inconsistent.
*
* This function can do some of the same jobs as utf8_prevchar(). */
unsigned char *
utf8_step_backward(unsigned char *string, unsigned char *start,
int max, enum utf8_step way, int *count)
{
int steps = 0;
unsigned char *current = string;
assert(string);
assert(start);
assert(max >= 0);
if_assert_failed goto invalid_arg;
switch (way) {
case UTF8_STEP_CHARACTERS:
while (steps < max && current > start) {
--current;
if (utf8_islead(*current))
++steps;
}
break;
case UTF8_STEP_CELLS_FEWER:
case UTF8_STEP_CELLS_MORE:
while (steps < max) {
unsigned char *prev = current;
unsigned char *look;
unicode_val_T u;
int width;
if (current <= start)
break;
do {
--current;
} while (current > start && !utf8_islead(*current));
look = current;
u = utf8_to_unicode(&look, prev);
if (u == UCS_NO_CHAR) {
/* Assume the incomplete sequence
* costs one cell. */
width = 1;
} else
width = unicode_to_cell(u);
if (way == UTF8_STEP_CELLS_FEWER
&& steps + width > max) {
/* Back off. */
current = prev;
break;
}
steps += width;
}
break;
default:
INTERNAL("impossible enum utf8_step");
}
invalid_arg:
if (count)
*count = steps;
return current;
}
/*
* Find out number of standard terminal collumns needed for displaying symbol
* (glyph) which represents Unicode character c.
*
* TODO: Use wcwidth when it is available. This seems to require:
* - Make the configure script check whether <wchar.h> and wcwidth exist.
* - Define _XOPEN_SOURCE and include <wchar.h>.
* - Test that __STDC_ISO_10646__ is defined. (This macro means wchar_t
* matches ISO 10646 in all locales.)
* However, these do not suffice, because wcwidth depends on LC_CTYPE
* in glibc-2.3.6. For instance, wcwidth(0xff20) is -1 when LC_CTYPE
* is "fi_FI.ISO-8859-1" or "C", but 2 when LC_CTYPE is "fi_FI.UTF-8".
* <features.h> defines __STDC_ISO_10646__ as 200009L, so 0xff20 means
* U+FF20 FULLWIDTH COMMERCIAL AT regardless of LC_CTYPE; but this
* character is apparently not supported in all locales. Why is that?
* - Perhaps there is standardese that requires supported characters
* to be convertable to multibyte form. Then ELinks could just pick
* some UTF-8 locale for its wcwidth purposes.
* - Perhaps wcwidth can even return different nonnegative values for
* the same ISO 10646 character in different locales. Then ELinks
* would have to set LC_CTYPE to match at least the terminal's
* charset (which may differ from the LC_CTYPE environment variable,
* especially when the master process is serving a slave terminal).
* But there is no guarantee that the libc supports all the same
* charsets as ELinks does.
* For now, it seems safest to avoid the potentially locale-dependent
* libc version of wcwidth, and instead use a hardcoded mapping.
*
* @return 2 for double-width glyph, 1 for others.
* 0 for unprintable glyphs (like 0x200e: "LEFT-TO-RIGHT MARK")
*/
NONSTATIC_INLINE int
unicode_to_cell(unicode_val_T c)
{
if (c == 0x200e || c == 0x200f)
return 0;
if (c >= 0x1100
&& (c <= 0x115f /* Hangul Jamo */
|| c == 0x2329
|| c == 0x232a
|| (c >= 0x2e80 && c <= 0xa4cf
&& c != 0x303f) /* CJK ... Yi */
|| (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
|| (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility
Ideographs */
|| (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
|| (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
|| (c >= 0xffe0 && c <= 0xffe6)
|| (c >= 0x20000 && c <= 0x2fffd)
|| (c >= 0x30000 && c <= 0x3fffd)))
return 2;
return 1;
}
/* Fold the case of a Unicode character, so that hotkeys in labels can
* be compared case-insensitively. It is unspecified whether the
* result will be in upper or lower case. */
unicode_val_T
unicode_fold_label_case(unicode_val_T c)
{
#if __STDC_ISO_10646__ && HAVE_WCTYPE_H
return towlower(c);
#else /* !(__STDC_ISO_10646__ && HAVE_WCTYPE_H) */
/* For now, this supports only ASCII. It would be possible to
* use code generated from CaseFolding.txt of Unicode if the
* acknowledgements required by http://www.unicode.org/copyright.html
* were added to associated documentation of ELinks. */
if (c >= 0x41 && c <= 0x5A)
return c + 0x20;
else
return c;
#endif /* !(__STDC_ISO_10646__ && HAVE_WCTYPE_H) */
}
#endif /* CONFIG_UTF8 */
NONSTATIC_INLINE unicode_val_T
utf8_to_unicode(unsigned char **string, const unsigned char *end)
{
unsigned char *str = *string;
unicode_val_T u;
int length;
length = utf8char_len_tab[str[0]];
if (str + length > end) {
return UCS_NO_CHAR;
}
switch (length) {
case 1: /* U+0000 to U+007F */
if (str[0] >= 0x80) {
invalid_utf8:
++*string;
return UCS_REPLACEMENT_CHARACTER;
}
u = str[0];
break;
case 2: /* U+0080 to U+07FF */
if ((str[1] & 0xc0) != 0x80)
goto invalid_utf8;
u = (str[0] & 0x1f) << 6;
u += (str[1] & 0x3f);
if (u < 0x80)
goto invalid_utf8;
break;
case 3: /* U+0800 to U+FFFF, except surrogates */
if ((str[1] & 0xc0) != 0x80 || (str[2] & 0xc0) != 0x80)
goto invalid_utf8;
u = (str[0] & 0x0f) << 12;
u += ((str[1] & 0x3f) << 6);
u += (str[2] & 0x3f);
if (u < 0x800 || is_utf16_surrogate(u))
goto invalid_utf8;
break;
case 4: /* U+10000 to U+1FFFFF */
if ((str[1] & 0xc0) != 0x80 || (str[2] & 0xc0) != 0x80
|| (str[3] & 0xc0) != 0x80)
goto invalid_utf8;
u = (str[0] & 0x0f) << 18;
u += ((str[1] & 0x3f) << 12);
u += ((str[2] & 0x3f) << 6);
u += (str[3] & 0x3f);
if (u < 0x10000)
goto invalid_utf8;
break;
case 5: /* U+200000 to U+3FFFFFF */
if ((str[1] & 0xc0) != 0x80 || (str[2] & 0xc0) != 0x80
|| (str[3] & 0xc0) != 0x80 || (str[4] & 0xc0) != 0x80)
goto invalid_utf8;
u = (str[0] & 0x0f) << 24;
u += ((str[1] & 0x3f) << 18);
u += ((str[2] & 0x3f) << 12);
u += ((str[3] & 0x3f) << 6);
u += (str[4] & 0x3f);
if (u < 0x200000)
goto invalid_utf8;
break;
case 6: /* U+4000000 to U+7FFFFFFF */
if ((str[1] & 0xc0) != 0x80 || (str[2] & 0xc0) != 0x80
|| (str[3] & 0xc0) != 0x80 || (str[4] & 0xc0) != 0x80
|| (str[5] & 0xc0) != 0x80)
goto invalid_utf8;
u = (str[0] & 0x01) << 30;
u += ((str[1] & 0x3f) << 24);
u += ((str[2] & 0x3f) << 18);
u += ((str[3] & 0x3f) << 12);
u += ((str[4] & 0x3f) << 6);
u += (str[5] & 0x3f);
if (u < 0x4000000)
goto invalid_utf8;
break;
default:
INTERNAL("utf8char_len_tab out of range");
goto invalid_utf8;
}
*string = str + length;
return u;
}
/* The common part of cp2u and cp2utf_8. */
static unicode_val_T
cp2u_shared(const struct codepage_desc *from, unsigned char c)
{
unicode_val_T u = from->highhalf[c - 0x80];
if (u == 0xFFFF) u = UCS_REPLACEMENT_CHARACTER;
return u;
}
/* Used for converting input from the terminal. */
unicode_val_T
cp2u(int from, unsigned char c)
{
from &= ~SYSTEM_CHARSET_FLAG;
/* UTF-8 is a multibyte codepage and cannot be handled with
* this function. */
assert(!is_cp_ptr_utf8(&codepages[from]));
if_assert_failed return UCS_REPLACEMENT_CHARACTER;
if (c < 0x80) return c;
else return cp2u_shared(&codepages[from], c);
}
/* This slow and ugly code is used by the terminal utf_8_io */
const unsigned char *
cp2utf8(int from, int c)
{
from &= ~SYSTEM_CHARSET_FLAG;
if (is_cp_ptr_utf8(&codepages[from]) || c < 128)
return strings[c];
return encode_utf8(cp2u_shared(&codepages[from], c));
}
unicode_val_T
cp_to_unicode(int codepage, unsigned char **string, const unsigned char *end)
{
unicode_val_T ret;
if (is_cp_utf8(codepage))
return utf8_to_unicode(string, end);
if (*string >= end)
return UCS_NO_CHAR;
ret = cp2u(codepage, **string);
++*string;
return ret;
}
#ifdef CONFIG_COMBINE
unicode_val_T last_combined = UCS_BEGIN_COMBINED - 1;
unicode_val_T **combined;
struct hash *combined_hash;
unicode_val_T
get_combined(unicode_val_T *data, int length)
{
struct hash_item *item;
unicode_val_T *key;
int i, indeks;
assert(length >= 1 && length <= UCS_MAX_LENGTH_COMBINED);
if_assert_failed return UCS_NO_CHAR;
if (!combined_hash) combined_hash = init_hash8();
if (!combined_hash) return UCS_NO_CHAR;
item = get_hash_item(combined_hash, (unsigned char *)data, length * sizeof(*data));
if (item) return (unicode_val_T)(long)item->value;
if (last_combined >= UCS_END_COMBINED) return UCS_NO_CHAR;
key = mem_alloc((length + 1) * sizeof(*key));
if (!key) return UCS_NO_CHAR;
for (i = 0; i < length; i++)
key[i] = data[i];
key[i] = UCS_END_COMBINED;
last_combined++;
indeks = last_combined - UCS_BEGIN_COMBINED;
combined = mem_realloc(combined, sizeof(*combined) * (indeks + 1));
if (!combined) {
mem_free(key);
last_combined--;
return UCS_NO_CHAR;
}
combined[indeks] = key;
item = add_hash_item(combined_hash, (unsigned char *)key,
length * sizeof(*data), (void *)(long)(last_combined));
if (!item) {
last_combined--;
mem_free(key);
return UCS_NO_CHAR;
}
return last_combined;
}
void
free_combined()
{
int i, end = last_combined - UCS_BEGIN_COMBINED + 1;
if (combined_hash)
free_hash(&combined_hash);
for (i = 0; i < end; i++)
mem_free(combined[i]);
mem_free_if(combined);
}
#endif /* CONFIG_COMBINE */
static void
add_utf8(struct conv_table *ct, unicode_val_T u, const unsigned char *str)
{
unsigned char *p = encode_utf8(u);
while (p[1]) {
if (ct[*p].t) ct = ct[*p].u.tbl;
else {
struct conv_table *nct;
assertm(ct[*p].u.str == no_str, "bad utf encoding #1");
if_assert_failed return;
nct = mem_calloc(256, sizeof(*nct));
if (!nct) return;
new_translation_table(nct);
ct[*p].t = 1;
ct[*p].u.tbl = nct;
ct = nct;
}
p++;
}
assertm(!ct[*p].t, "bad utf encoding #2");
if_assert_failed return;
if (ct[*p].u.str == no_str)
ct[*p].u.str = str;
}
/* A conversion table from some charset to UTF-8.
* If it is from UTF-8 to UTF-8, it converts each byte separately.
* Unlike in other translation tables, the strings in elements 0x80 to
* 0xFF are allocated dynamically. */
struct conv_table utf_table[256];
int utf_table_init = 1;
static void
free_utf_table(void)
{
int i;
/* Cast away const. */
for (i = 128; i < 256; i++)
mem_free((unsigned char *) utf_table[i].u.str);
}
static struct conv_table *
get_translation_table_to_utf8(int from)
{
int i;
static int lfr = -1;
if (from == -1) return NULL;
from &= ~SYSTEM_CHARSET_FLAG;
if (from == lfr) return utf_table;
lfr = from;
if (utf_table_init) {
memset(utf_table, 0, sizeof(utf_table));
utf_table_init = 0;
} else
free_utf_table();
for (i = 0; i < 128; i++)
utf_table[i].u.str = strings[i];
if (is_cp_ptr_utf8(&codepages[from])) {
for (i = 128; i < 256; i++)
utf_table[i].u.str = stracpy(strings[i]);
return utf_table;
}
for (i = 128; i < 256; i++) {
unicode_val_T u = codepages[from].highhalf[i - 0x80];
if (u == 0xFFFF)
utf_table[i].u.str = NULL;
else
utf_table[i].u.str = stracpy(encode_utf8(u));
}
for (i = 0; codepages[from].table[i].c; i++) {
unicode_val_T u = codepages[from].table[i].u;
if (!utf_table[codepages[from].table[i].c].u.str)
utf_table[codepages[from].table[i].c].u.str =
stracpy(encode_utf8(u));
}
for (i = 128; i < 256; i++)
if (!utf_table[i].u.str)
utf_table[i].u.str = stracpy(no_str);
return utf_table;
}
/* A conversion table between two charsets, where the target is not UTF-8. */
static struct conv_table table[256];
static int first = 1;
void
free_conv_table(void)
{
if (!utf_table_init) free_utf_table();
if (first) {
memset(table, 0, sizeof(table));
first = 0;
}
new_translation_table(table);
#ifdef HAVE_ICONV
if (iconv_cd != (iconv_t)-1) {
iconv_close(iconv_cd);
iconv_cd = (iconv_t)-1;
}
#endif
}
struct conv_table *
get_translation_table(int from, int to)
{
static int lfr = -1;
static int lto = -1;
from &= ~SYSTEM_CHARSET_FLAG;
to &= ~SYSTEM_CHARSET_FLAG;
if (first) {
memset(table, 0, sizeof(table));
first = 0;
}
if (codepages[from].iconv) {
struct conv_table *table2 = get_translation_table_to_utf8(34);
if (table2) table2->iconv_cp = from;
return table2;
}
if (/*from == to ||*/ from == -1 || to == -1)
return NULL;
if (is_cp_ptr_utf8(&codepages[to])) {
struct conv_table *table2 = get_translation_table_to_utf8(from);
if (table2) table2->iconv_cp = -1;
return table2;
}
if (from == lfr && to == lto)
return table;
lfr = from;
lto = to;
new_translation_table(table);
if (is_cp_ptr_utf8(&codepages[from])) {
int i;
/* Map U+00A0 and U+00AD the same way as u2cp() would. */
add_utf8(table, UCS_NO_BREAK_SPACE, strings[NBSP_CHAR]);
add_utf8(table, UCS_SOFT_HYPHEN, "");
for (i = 0x80; i <= 0xFF; i++)
if (codepages[to].highhalf[i - 0x80] != 0xFFFF)
add_utf8(table,
codepages[to].highhalf[i - 0x80],
strings[i]);
for (i = 0; codepages[to].table[i].c; i++)
add_utf8(table, codepages[to].table[i].u,
strings[codepages[to].table[i].c]);
for (i = 0; unicode_7b[i].x != -1; i++)
if (unicode_7b[i].x >= 0x80)
add_utf8(table, unicode_7b[i].x,
unicode_7b[i].s);
} else {
int i;
for (i = 128; i < 256; i++) {
if (codepages[from].highhalf[i - 0x80] != 0xFFFF) {
const unsigned char *u;
u = u2cp(codepages[from].highhalf[i - 0x80], to);
if (u) table[i].u.str = u;
}
}
}
return table;
}
static inline int
xxstrcmp(unsigned char *s1, unsigned char *s2, int l2)
{
while (l2) {
if (*s1 > *s2) return 1;
if (*s1 < *s2) return -1;
s1++;
s2++;
l2--;
}
return *s2 ? -1 : 0;
}
/* Entity cache debugging purpose. */
#if 0
#define DEBUG_ENTITY_CACHE
#else
#undef DEBUG_ENTITY_CACHE
#endif
struct entity_cache {
unsigned int hits;
int strlen;
int encoding;
const unsigned char *result;
unsigned char str[20]; /* Suffice in any case. */
};
/* comparison function for qsort() */
static int
hits_cmp(const void *v1, const void *v2)
{
const struct entity_cache *a = v1, *b = v2;
if (a->hits == b->hits) return 0;
if (a->hits > b->hits) return -1;
else return 1;
}
static int
compare_entities(const void *key_, const void *element_)
{
struct string *key = (struct string *) key_;
struct entity *element = (struct entity *) element_;
int length = key->length;
unsigned char *first = key->source;
unsigned char *second = element->s;
return xxstrcmp(first, second, length);
}
const unsigned char *
get_entity_string(const unsigned char *str, const int strlen, int encoding)
{
#define ENTITY_CACHE_SIZE 10 /* 10 seems a good value. */
#define ENTITY_CACHE_MAXLEN 9 /* entities with length >= ENTITY_CACHE_MAXLEN or == 1
will go in [0] table */
static struct entity_cache entity_cache[ENTITY_CACHE_MAXLEN][ENTITY_CACHE_SIZE];
static unsigned int nb_entity_cache[ENTITY_CACHE_MAXLEN];
unsigned int slen = 0;
const unsigned char *result = NULL;
/* Note that an object of static storage duration is automatically
* initialised to zero in C. */
if (strlen <= 0) return NULL;
#ifdef CONFIG_UTF8
/* TODO: caching UTF-8 */
encoding &= ~SYSTEM_CHARSET_FLAG;
if (is_cp_ptr_utf8(&codepages[encoding]))
goto skip;
#endif /* CONFIG_UTF8 */
/* Check if cached. A test on many websites (freshmeat.net + whole ELinks website
* + google + slashdot + websites that result from a search for test on google,
* + various ones) show quite impressive improvment:
* Top ten is:
* 0: hits=2459 l=4 st='nbsp'
* 1: hits=2152 l=6 st='eacute'
* 2: hits=235 l=6 st='egrave'
* 3: hits=136 l=6 st='agrave'
* 4: hits=100 l=3 st='amp'
* 5: hits=40 l=5 st='laquo'
* 6: hits=8 l=4 st='copy'
* 7: hits=5 l=2 st='gt'
* 8: hits=2 l=2 st='lt'
* 9: hits=1 l=6 st='middot'
*
* Most of the time cache hit ratio is near 95%.
*
* A long test shows: 15186 hits vs. 24 misses and mean iteration
* count is kept < 2 (worst case 1.58). Not so bad ;)
*
* --Zas */
/* entities with length >= ENTITY_CACHE_MAXLEN or == 1 will go in [0] table */
slen = (strlen > 1 && strlen < ENTITY_CACHE_MAXLEN) ? strlen : 0;
if (strlen < ENTITY_CACHE_MAXLEN && nb_entity_cache[slen] > 0) {
int i;
for (i = 0; i < nb_entity_cache[slen]; i++) {
if (entity_cache[slen][i].encoding == encoding
&& !memcmp(str, entity_cache[slen][i].str, strlen)) {
#ifdef DEBUG_ENTITY_CACHE
static double total_iter = 0;
static unsigned long hit_count = 0;
total_iter += i + 1;
hit_count++;
fprintf(stderr, "hit after %d iter. (mean = %0.2f)\n", i + 1, total_iter / (double) hit_count);
#endif
if (entity_cache[slen][i].hits < (unsigned int) ~0)
entity_cache[slen][i].hits++;
return entity_cache[slen][i].result;
}
}
#ifdef DEBUG_ENTITY_CACHE
fprintf(stderr, "miss\n");
#endif
}
#ifdef CONFIG_UTF8
skip:
#endif /* CONFIG_UTF8 */
if (*str == '#') { /* Numeric entity. */
int l = (int) strlen;
unsigned char *st = (unsigned char *) str;
unicode_val_T n = 0;
if (l == 1) goto end; /* &#; ? */
st++, l--;
if ((*st | 32) == 'x') { /* Hexadecimal */
if (l == 1 || l > 9) goto end; /* xFFFFFFFF max. */
st++, l--;
do {
unsigned char c = (*(st++) | 32);
if (isdigit(c))
n = (n << 4) | (c - '0');
else if (isxdigit(c))
n = (n << 4) | (c - 'a' + 10);
else
goto end; /* Bad char. */
} while (--l);
} else { /* Decimal */
if (l > 10) goto end; /* 4294967295 max. */
do {
unsigned char c = *(st++);
if (isdigit(c))
n = n * 10 + c - '0';
else
goto end; /* Bad char. */
/* Limit to 0xFFFFFFFF. */
if (n >= (unicode_val_T) 0xFFFFFFFFu)
goto end;
} while (--l);
}
result = u2cp(n, encoding);
#ifdef DEBUG_ENTITY_CACHE
fprintf(stderr, "%lu %016x %s\n", (unsigned long) n , n, result);
#endif
} else { /* Text entity. */
struct string key = INIT_STRING((unsigned char *) str, strlen);
struct entity *element = bsearch((void *) &key, entities,
N_ENTITIES,
sizeof(*element),
compare_entities);
if (element) result = u2cp(element->c, encoding);
}
#ifdef CONFIG_UTF8
if (is_cp_ptr_utf8(&codepages[encoding])) {
return result;
}
#endif /* CONFIG_UTF8 */
end:
/* Take care of potential buffer overflow. */
if (strlen < sizeof(entity_cache[slen][0].str)) {
struct entity_cache *ece;
/* Sort entries by hit order. */
if (nb_entity_cache[slen] > 1)
qsort(&entity_cache[slen][0], nb_entity_cache[slen],
sizeof(entity_cache[slen][0]), hits_cmp);
/* Increment number of cache entries if possible.
* Else, just replace the least used entry. */
if (nb_entity_cache[slen] < ENTITY_CACHE_SIZE) nb_entity_cache[slen]++;
ece = &entity_cache[slen][nb_entity_cache[slen] - 1];
/* Copy new entry to cache. */
ece->hits = 1;
ece->strlen = strlen;
ece->encoding = encoding;
ece->result = result;
memcpy(ece->str, str, strlen);
ece->str[strlen] = '\0';
#ifdef DEBUG_ENTITY_CACHE
fprintf(stderr, "Added in [%u]: l=%d st='%s'\n", slen,
entity_cache[slen][0].strlen, entity_cache[slen][0].str);
{
unsigned int i;
fprintf(stderr, "- Cache entries [%u] -\n", slen);
for (i = 0; i < nb_entity_cache[slen] ; i++)
fprintf(stderr, "%d: hits=%u l=%d st='%s'\n", i,
entity_cache[slen][i].hits, entity_cache[slen][i].strlen,
entity_cache[slen][i].str);
fprintf(stderr, "-----------------\n");
}
#endif /* DEBUG_ENTITY_CACHE */
}
return result;
}
unsigned char *
convert_string(struct conv_table *convert_table,
unsigned char *chars2, int charslen2, int cp,
enum convert_string_mode mode, int *length,
void (*callback)(void *data, unsigned char *buf, int buflen),
void *callback_data)
{
unsigned char *buffer;
int bufferpos = 0;
int charspos = 0;
unsigned char *chars = chars2;
int charslen = charslen2;
#ifdef HAVE_ICONV
static char iconv_input[256];
static char iconv_output[256 * 8];
static size_t iconv_offset;
static int iconv_cp;
static size_t iconv_inleft;
size_t iconv_outleft = 256 * 8;
int loop = 0;
int is_iconv = 0;
int chars_offset = 0;
if (!convert_table && !memchr(chars, '&', charslen)) {
if (callback) {
if (charslen) callback(callback_data, chars, charslen);
return NULL;
} else {
return memacpy(chars, charslen);
}
}
if (cp >= 0) {
if (convert_table && convert_table->iconv_cp > 0) {
is_iconv = 1;
cp = convert_table->iconv_cp;
} else {
is_iconv = codepages[cp & ~SYSTEM_CHARSET_FLAG].iconv;
}
}
#endif
/* Buffer allocation */
buffer = mem_alloc(ALLOC_GR + 1 /* trailing \0 */);
if (!buffer) return NULL;
#ifdef HAVE_ICONV
if (is_iconv) {
int v;
size_t before, to_copy;
char *outp, *inp;
if (iconv_cd >= 0) {
if (cp != iconv_cp) {
iconv_close(iconv_cd);
iconv_cd = (iconv_t)-1;
}
}
if (iconv_cd == (iconv_t)-1) {
iconv_offset = 0;
iconv_cd = iconv_open("utf-8", get_cp_mime_name(cp));
if (iconv_cd == (iconv_t)-1) {
mem_free(buffer);
return NULL;
}
iconv_cp = cp;
}
repeat:
to_copy = charslen2 - chars_offset;
if (to_copy > 256 - iconv_offset) to_copy = 256 - iconv_offset;
memcpy(iconv_input + iconv_offset, chars2 + chars_offset, to_copy);
iconv_outleft = 256 * 8;
iconv_inleft = iconv_offset + to_copy;
inp = iconv_input;
outp = iconv_output;
before = iconv_inleft;
v = iconv(iconv_cd, &inp, &iconv_inleft, &outp, &iconv_outleft);
chars_offset += before - iconv_inleft;
charslen = 256 * 8 - iconv_outleft;
chars = (unsigned char *)iconv_output;
charspos = 0;
if (v == -1) {
switch (errno) {
case EINVAL:
memcpy(iconv_input, inp, iconv_inleft);
iconv_offset = iconv_inleft;
break;
case EILSEQ:
loop = 0;
goto out;
break;
default:
iconv_offset = 0;
}
} else {
iconv_offset = 0;
}
loop = chars_offset < charslen2;
}
#endif
/* Iterate ;-) */
out:
while (charspos < charslen) {
const unsigned char *translit;
#define PUTC do { \
buffer[bufferpos++] = chars[charspos++]; \
translit = ""; \
goto flush; \
} while (0)
if (chars[charspos] != '&') {
struct conv_table *t;
int i;
if (chars[charspos] < 128 || !convert_table) PUTC;
t = convert_table;
i = charspos;
while (t[chars[i]].t) {
t = t[chars[i++]].u.tbl;
if (i >= charslen) PUTC;
}
translit = t[chars[i]].u.str;
charspos = i + 1;
} else if (mode == CSM_FORM || mode == CSM_NONE) {
PUTC;
} else {
int start = charspos + 1;
int i = start;
while (i < charslen
&& (isasciialpha(chars[i])
|| isdigit(chars[i])
|| (chars[i] == '#')))
i++;
/* This prevents bug 213: we were expanding "entities"
* in URL query strings. */
/* XXX: But this disables &nbsp&nbsp usage, which
* appears to be relatively common! --pasky */
if ((mode == CSM_DEFAULT || (chars[i] != '&' && chars[i] != '='))
&& i > start
&& !isasciialpha(chars[i]) && !isdigit(chars[i])) {
translit = get_entity_string(&chars[start], i - start,
cp);
if (chars[i] != ';') {
/* Eat &nbsp &nbsp<foo> happily, but
* pull back from the character after
* entity string if it is not the valid
* terminator. */
i--;
}
if (!translit) PUTC;
charspos = i + (i < charslen);
} else PUTC;
}
if (!translit[0]) continue;
if (!translit[1]) {
buffer[bufferpos++] = translit[0];
translit = "";
goto flush;
}
while (*translit) {
unsigned char *new_;
buffer[bufferpos++] = *(translit++);
flush:
if (bufferpos & (ALLOC_GR - 1)) continue;
if (callback) {
buffer[bufferpos] = 0;
callback(callback_data, buffer, bufferpos);
bufferpos = 0;
} else {
new_ = mem_realloc(buffer, bufferpos + ALLOC_GR);
if (!new_) {
mem_free(buffer);
return NULL;
}
buffer = new_;
}
}
#undef PUTC
}
#ifdef HAVE_ICONV
if (loop) goto repeat;
#endif
/* Say bye */
buffer[bufferpos] = 0;
if (length) *length = bufferpos;
if (callback) {
if (bufferpos) callback(callback_data, buffer, bufferpos);
mem_free(buffer);
return NULL;
} else {
return buffer;
}
}
#ifndef USE_FASTFIND
int
get_cp_index(const unsigned char *name)
{
int i, a;
int syscp = 0;
if (!c_strcasecmp(name, "System")) {
#if HAVE_LANGINFO_CODESET
name = nl_langinfo(CODESET);
syscp = SYSTEM_CHARSET_FLAG;
#else
name = "us-ascii";
#endif
}
for (i = 0; codepages[i].name; i++) {
for (a = 0; codepages[i].aliases[a]; a++) {
/* In the past, we looked for the longest substring
* in all the names; it is way too expensive, though:
*
* % cumulative self self total
* time seconds seconds calls us/call us/call name
* 3.00 0.66 0.03 1325 22.64 22.64 get_cp_index
*
* Anything called from redraw_screen() is in fact
* relatively expensive, even if it's called just
* once. So we will do a simple strcasecmp() here.
*/
if (!c_strcasecmp(name, codepages[i].aliases[a]))
return i | syscp;
}
}
if (syscp) {
return get_cp_index("us-ascii") | syscp;
} else {
return -1;
}
}
#else
static unsigned int i_name = 0;
static unsigned int i_alias = 0;
/* Reset internal list pointer */
void
charsets_list_reset(void)
{
i_name = 0;
i_alias = 0;
}
/* Returns a pointer to a struct that contains current key and data pointers
* and increment internal pointer. It returns NULL when key is NULL. */
struct fastfind_key_value *
charsets_list_next(void)
{
static struct fastfind_key_value kv;
if (!codepages[i_name].name) return NULL;
kv.key = codepages[i_name].aliases[i_alias];
kv.data = (void *) &codepages[i_name]; /* cast away const */
if (codepages[i_name].aliases[i_alias + 1])
i_alias++;
else {
i_name++;
i_alias = 0;
}
return &kv;
}
static struct fastfind_index ff_charsets_index
= INIT_FASTFIND_INDEX("charsets_lookup", charsets_list_reset, charsets_list_next);
/* It searchs for a charset named @name or one of its aliases and
* returns index for it or -1 if not found. */
int
get_cp_index(const unsigned char *name)
{
const struct codepage_desc *codepage;
int syscp = 0;
if (!c_strcasecmp(name, "System")) {
#if HAVE_LANGINFO_CODESET
name = nl_langinfo(CODESET);
syscp = SYSTEM_CHARSET_FLAG;
#else
name = "us-ascii";
#endif
}
codepage = fastfind_search(&ff_charsets_index, name, strlen(name));
if (codepage) {
assert(codepages <= codepage && codepage < codepages + N_CODEPAGES);
return (codepage - codepages) | syscp;
} else if (syscp) {
return get_cp_index("us-ascii") | syscp;
} else {
return -1;
}
}
#endif /* USE_FASTFIND */
void
init_charsets_lookup(void)
{
#ifdef USE_FASTFIND
fastfind_index(&ff_charsets_index, FF_COMPRESS);
#endif
}
void
free_charsets_lookup(void)
{
#ifdef USE_FASTFIND
fastfind_done(&ff_charsets_index);
#endif
}
/* Get the codepage's name for displaying to the user, or NULL if
* @cp_index is one past the end. In the future, we might want to
* localize these with gettext. So it may be best not to use this
* function if the name will have to be converted back to an
* index. */
unsigned char *
get_cp_name(int cp_index)
{
if (cp_index < 0) return "none";
if (cp_index & SYSTEM_CHARSET_FLAG) return "System";
return codepages[cp_index].name;
}
/* Get the codepage's name for saving to a configuration file. These
* names can be converted back to indexes, even in future versions of
* ELinks. */
unsigned char *
get_cp_config_name(int cp_index)
{
if (cp_index < 0) return "none";
if (cp_index & SYSTEM_CHARSET_FLAG) return "System";
if (!codepages[cp_index].aliases) return NULL;
return codepages[cp_index].aliases[0];
}
/* Get the codepage's name for sending to a library or server that
* understands MIME charset names. This function irreversibly maps
* the "System" codepage to the underlying charset. */
unsigned char *
get_cp_mime_name(int cp_index)
{
if (cp_index < 0) return "none";
cp_index &= ~SYSTEM_CHARSET_FLAG;
if (!codepages[cp_index].aliases) return NULL;
return codepages[cp_index].aliases[0];
}
int
is_cp_utf8(int cp_index)
{
cp_index &= ~SYSTEM_CHARSET_FLAG;
return is_cp_ptr_utf8(&codepages[cp_index]);
}
/* This function will be used by the xhtml parser. */
const uint16_t *
get_cp_highhalf(const unsigned char *name)
{
int cp = get_cp_index(name);
if (cp < 0) return NULL;
cp &= ~SYSTEM_CHARSET_FLAG;
return codepages[cp].highhalf;
}