/* * $LynxId: UCAux.c,v 1.40 2009/03/10 21:13:12 tom Exp $ */ #include #include #include #include #include #include #include #include #include BOOL UCCanUniTranslateFrom(int from) { if (from < 0) return NO; #ifndef EXP_JAPANESEUTF8_SUPPORT if (LYCharSet_UC[from].enc == UCT_ENC_CJK) return NO; #endif if (!strcmp(LYCharSet_UC[from].MIMEname, "x-transparent")) return NO; /* others YES */ return YES; } BOOL UCCanTranslateUniTo(int to) { if (to < 0) return NO; /*??? if (!strcmp(LYCharSet_UC[to].MIMEname, "x-transparent")) return NO; */ return YES; /* well at least some characters... */ } BOOL UCCanTranslateFromTo(int from, int to) { if (from == to) return YES; if (from < 0 || to < 0) return NO; if (from == LATIN1) return UCCanTranslateUniTo(to); if (to == LATIN1 || LYCharSet_UC[to].enc == UCT_ENC_UTF8) return UCCanUniTranslateFrom(from); { const char *fromname = LYCharSet_UC[from].MIMEname; const char *toname = LYCharSet_UC[to].MIMEname; if (!strcmp(fromname, "x-transparent") || !strcmp(toname, "x-transparent")) { return YES; /* ??? */ } else if (!strcmp(fromname, "us-ascii")) { return YES; } if (LYCharSet_UC[from].enc == UCT_ENC_CJK) { /* * CJK mode may be off (i.e., !IS_CJK_TTY) because the current * document is not CJK, but the check may be for capability in * relation to another document, for which CJK mode might be turned * on when retrieved. Thus, when the from charset is CJK, check if * the to charset is CJK, and return NO or YES in relation to that. * - FM */ if (LYCharSet_UC[to].enc != UCT_ENC_CJK) return NO; if ((!strcmp(toname, "euc-jp") || !strcmp(toname, "shift_jis")) && (!strcmp(fromname, "euc-jp") || !strcmp(fromname, "shift_jis"))) return YES; /* * The euc-cn and euc-kr charsets were handled by the (from == to) * above, so we need not check those. - FM */ return NO; } } return YES; /* others YES */ } /* * Returns YES if no translation necessary (because * charsets are equal, are equivalent, etc.). */ BOOL UCNeedNotTranslate(int from, int to) { const char *fromname; const char *toname; if (from == to) return YES; if (from < 0) return NO; /* ??? */ if (LYCharSet_UC[from].enc == UCT_ENC_7BIT) { return YES; /* Only 7bit chars. */ } fromname = LYCharSet_UC[from].MIMEname; if (!strcmp(fromname, "x-transparent") || !strcmp(fromname, "us-ascii")) { return YES; } if (to < 0) return NO; /* ??? */ if (to == LATIN1) { if (LYCharSet_UC[from].codepoints & (UCT_CP_SUBSETOF_LAT1)) return YES; } toname = LYCharSet_UC[to].MIMEname; if (!strcmp(toname, "x-transparent")) { return YES; } if (LYCharSet_UC[to].enc == UCT_ENC_UTF8) { return NO; } if (from == LATIN1) { if (LYCharSet_UC[from].codepoints & (UCT_CP_SUPERSETOF_LAT1)) return YES; } if (LYCharSet_UC[from].enc == UCT_ENC_CJK) { if (!IS_CJK_TTY) /* Use that global flag, for now. */ return NO; if (HTCJK == JAPANESE && (!strcmp(fromname, "euc-jp") || !strcmp(fromname, "shift_jis"))) return YES; /* translate internally by lynx, no unicode */ return NO; /* If not handled by (from == to) above. */ } return NO; } /* * The idea here is that any stage of the stream pipe which is interested * in some charset dependent processing will call this function. * Given input and output charsets, this function will set various flags * in a UCTransParams structure that _suggest_ to the caller what to do. * * Should be called once when a stage starts processing text (and the * input and output charsets are known), or whenever one of input or * output charsets has changed (e.g., by SGML.c stage after HTML.c stage * has processed a META tag). * The global flags (LYRawMode, HTPassEightBitRaw etc.) are currently * not taken into account here (except for HTCJK, somewhat), it's still * up to the caller to do something about them. - KW */ void UCSetTransParams(UCTransParams * pT, int cs_in, const LYUCcharset *p_in, int cs_out, const LYUCcharset *p_out) { CTRACE((tfp, "UCSetTransParams: from %s(%d) to %s(%d)\n", p_in->MIMEname, UCGetLYhndl_byMIME(p_in->MIMEname), p_out->MIMEname, UCGetLYhndl_byMIME(p_out->MIMEname))); /* * Initialize this element to FALSE, and set it TRUE below if we're dealing * with VISCII. - FM */ pT->trans_C0_to_uni = FALSE; /* * The "transparent" display character set is a "super raw mode". - FM */ pT->transp = (BOOL) (!strcmp(p_in->MIMEname, "x-transparent") || !strcmp(p_out->MIMEname, "x-transparent")); /* * UCS-2 is handled as a special case in SGML_write(). */ pT->ucs_mode = 0; if (pT->transp) { /* * Set up the structure for "transparent". - FM */ pT->do_cjk = FALSE; pT->decode_utf8 = FALSE; pT->output_utf8 = FALSE; /* We may, but won't know about it. - KW */ pT->do_8bitraw = TRUE; pT->use_raw_char_in = TRUE; pT->strip_raw_char_in = FALSE; pT->pass_160_173_raw = TRUE; pT->repl_translated_C0 = (BOOL) (p_out->enc == UCT_ENC_8BIT_C0); pT->trans_C0_to_uni = (BOOL) (p_in->enc == UCT_ENC_8BIT_C0 || p_out->enc == UCT_ENC_8BIT_C0); } else { /* * Initialize local flags. - FM */ BOOL intm_ucs = FALSE; BOOL use_ucs = FALSE; /* * Set this element if we want to treat the input as CJK. - FM */ pT->do_cjk = (BOOL) ((p_in->enc == UCT_ENC_CJK) && IS_CJK_TTY); /* * Set these elements based on whether we are dealing with UTF-8. - FM */ pT->decode_utf8 = (BOOL) (p_in->enc == UCT_ENC_UTF8); pT->output_utf8 = (BOOL) (p_out->enc == UCT_ENC_UTF8); if (pT->do_cjk) { /* * Set up the structure for a CJK input with * a CJK output (IS_CJK_TTY). - FM */ intm_ucs = FALSE; pT->trans_to_uni = FALSE; use_ucs = FALSE; pT->do_8bitraw = FALSE; pT->pass_160_173_raw = TRUE; pT->use_raw_char_in = FALSE; /* Not used for CJK. - KW */ pT->repl_translated_C0 = FALSE; pT->trans_from_uni = FALSE; /* Not used for CJK. - KW */ } else { /* * Set up for all other charset combinations. The intm_ucs flag is * set TRUE if the input charset is iso-8859-1 or UTF-8, or largely * equivalent to them, i.e., if we have UCS without having to do a * table translation. */ intm_ucs = (BOOL) (cs_in == LATIN1 || pT->decode_utf8 || (p_in->codepoints & (UCT_CP_SUBSETOF_LAT1 | UCT_CP_SUBSETOF_UCS2))); /* * pT->trans_to_uni is set TRUE if we do not have that as input * already, and we can translate to Unicode. Note that UTF-8 * always is converted to Unicode in functions that use the * transformation structure, so it is treated as already Unicode * here. */ pT->trans_to_uni = (BOOL) (!intm_ucs && UCCanUniTranslateFrom(cs_in)); /* * We set this if we are translating to Unicode and what normally * are low value control characters in fact are encoding octets for * the input charset (presently, this applies to VISCII). - FM */ pT->trans_C0_to_uni = (BOOL) (pT->trans_to_uni && p_in->enc == UCT_ENC_8BIT_C0); /* * We set this, presently, for VISCII. - FM */ pT->repl_translated_C0 = (BOOL) (p_out->enc == UCT_ENC_8BIT_C0); /* * Currently unused for any charset combination. * Should always be FALSE */ pT->strip_raw_char_in = FALSE; /* * use_ucs should be set TRUE if we have or will create Unicode * values for input octets or UTF multibytes. - FM */ use_ucs = (BOOL) (intm_ucs || pT->trans_to_uni); /* * This is set TRUE if use_ucs was set FALSE. It is complementary * to the HTPassEightBitRaw flag, which is set TRUE or FALSE * elsewhere based on the raw mode setting in relation to the * current Display Character Set. - FM */ pT->do_8bitraw = (BOOL) (!use_ucs); /* * This is set TRUE when 160 and 173 should not be treated as nbsp * and shy, respectively. - FM */ pT->pass_160_173_raw = (BOOL) (!use_ucs && !(p_in->like8859 & UCT_R_8859SPECL)); /* * This is set when the input and output charsets match, and they * are not ones which should go through a Unicode translation * process anyway. - FM */ pT->use_raw_char_in = (BOOL) (!pT->output_utf8 && cs_in == cs_out && !pT->trans_C0_to_uni); /* * This should be set TRUE when we expect to have done translation * to Unicode or had the equivalent as input, can translate it to * our output charset, and normally want to do so. The latter * depends on the pT->do_8bitraw and pT->use_raw_char_in values set * above, but also on HTPassEightBitRaw in any functions which use * the transformation structure.. - FM */ pT->trans_from_uni = (BOOL) (use_ucs && !pT->do_8bitraw && !pT->use_raw_char_in && UCCanTranslateUniTo(cs_out)); } } } /* * This function initializes the transformation * structure by setting all its elements to * FALSE. - KW */ void UCTransParams_clear(UCTransParams * pT) { pT->transp = FALSE; pT->do_cjk = FALSE; pT->decode_utf8 = FALSE; pT->output_utf8 = FALSE; pT->do_8bitraw = FALSE; pT->use_raw_char_in = FALSE; pT->strip_raw_char_in = FALSE; pT->pass_160_173_raw = FALSE; pT->trans_to_uni = FALSE; pT->trans_C0_to_uni = FALSE; pT->repl_translated_C0 = FALSE; pT->trans_from_uni = FALSE; } /* * If terminal is in UTF-8 mode, it probably cannot understand box drawing * chars as the 8-bit (n)curses handles them. (This may also be true for other * display character sets, but isn't currently checked.) In that case set the * chars for horizontal and vertical drawing chars to displayable ASCII chars * if '0' was requested. They'll stay as they are otherwise. -KW, TD * * If we're able to obtain a character set based on the locale settings, * assume that the user has setup $TERM and the fonts already so line-drawing * works. */ void UCSetBoxChars(int cset, int *pvert_out, int *phori_out, int vert_in, int hori_in) { BOOL fix_lines = FALSE; if (cset >= 0) { #ifndef WIDEC_CURSES if (LYCharSet_UC[cset].enc == UCT_ENC_UTF8) { fix_lines = TRUE; } #endif /* * If we've identified a charset that works, require it. * This is important if we have loaded a font, which would * confuse curses. */ /* US-ASCII vs Latin-1 is safe (usually) */ if ((cset == US_ASCII || cset == LATIN1) && (linedrawing_char_set == US_ASCII || linedrawing_char_set == LATIN1)) { #if (defined(FANCY_CURSES) && defined(A_ALTCHARSET)) || defined(USE_SLANG) vert_in = 0; hori_in = 0; #else ; #endif } #ifdef EXP_CHARTRANS_AUTOSWITCH #if defined(NCURSES_VERSION) || defined(HAVE_TIGETSTR) else { static BOOL first = TRUE; static int last_cset = -99; static BOOL last_result = TRUE; /* *INDENT-OFF* */ static struct { int mapping; int internal; int external; } table[] = { { 'j', 0x2518, 0 }, /* BOX DRAWINGS LIGHT UP AND LEFT */ { 'k', 0x2510, 0 }, /* BOX DRAWINGS LIGHT DOWN AND LEFT */ { 'l', 0x250c, 0 }, /* BOX DRAWINGS LIGHT DOWN AND RIGHT */ { 'm', 0x2514, 0 }, /* BOX DRAWINGS LIGHT UP AND RIGHT */ { 'n', 0x253c, 0 }, /* BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL */ { 'q', 0x2500, 0 }, /* BOX DRAWINGS LIGHT HORIZONTAL */ { 't', 0x251c, 0 }, /* BOX DRAWINGS LIGHT VERTICAL AND RIGHT */ { 'u', 0x2524, 0 }, /* BOX DRAWINGS LIGHT VERTICAL AND LEFT */ { 'v', 0x2534, 0 }, /* BOX DRAWINGS LIGHT UP AND HORIZONTAL */ { 'w', 0x252c, 0 }, /* BOX DRAWINGS LIGHT DOWN AND HORIZONTAL */ { 'x', 0x2502, 0 }, /* BOX DRAWINGS LIGHT VERTICAL */ }; /* *INDENT-ON* */ unsigned n; if (first) { char *map = tigetstr("acsc"); if (map != 0) { CTRACE((tfp, "build terminal line-drawing map\n")); while (map[0] != 0 && map[1] != 0) { for (n = 0; n < TABLESIZE(table); ++n) { if (table[n].mapping == map[0]) { table[n].external = UCH(map[1]); CTRACE((tfp, " map[%c] %#x -> %#x\n", table[n].mapping, table[n].internal, table[n].external)); break; } } map += 2; } } first = FALSE; } if (cset == last_cset) { fix_lines = last_result; } else if (cset == UTF8_handle) { last_result = FALSE; last_cset = cset; } else { CTRACE((tfp, "check terminal line-drawing map\n")); for (n = 0; n < TABLESIZE(table); ++n) { int test = UCTransUniChar(table[n].internal, cset); if (test != table[n].external) { CTRACE((tfp, "line-drawing map %c mismatch (have %#x, want %#x)\n", table[n].mapping, test, table[n].external)); fix_lines = TRUE; break; } } last_result = fix_lines; last_cset = cset; } } #else else if (cset != linedrawing_char_set && linedrawing_char_set >= 0) { fix_lines = TRUE; } #endif #endif } if (fix_lines) { if (!vert_in) vert_in = '|'; if (!hori_in) hori_in = '-'; } *pvert_out = vert_in; *phori_out = hori_in; } /* * Given an output target HTStream* (can also be a HTStructured* via * typecast), the target stream's put_character method, and a Unicode * character, CPutUtf8_charstring() will either output the UTF8 * encoding of the Unicode and return YES, or do nothing and return * NO (if conversion would be unnecessary or the Unicode character is * considered invalid). * * [Could be used more generally, but is currently only used for &#nnnnn * stuff - generation of UTF8 from 8-bit encoded charsets not yet done * by SGML.c etc.] */ #define PUTC(ch) ((*myPutc)(target, (char)(ch))) #define PUTC2(ch) ((*myPutc)(target,(char)(0x80|(0x3f &(ch))))) BOOL UCPutUtf8_charstring(HTStream *target, putc_func_t * myPutc, long code) { if (code < 128) return NO; /* indicate to caller we didn't handle it */ else if (code < 0x800L) { PUTC(0xc0 | (code >> 6)); PUTC2(code); } else if (code < 0x10000L) { PUTC(0xe0 | (code >> 12)); PUTC2(code >> 6); PUTC2(code); } else if (code < 0x200000L) { PUTC(0xf0 | (code >> 18)); PUTC2(code >> 12); PUTC2(code >> 6); PUTC2(code); } else if (code < 0x4000000L) { PUTC(0xf8 | (code >> 24)); PUTC2(code >> 18); PUTC2(code >> 12); PUTC2(code >> 6); PUTC2(code); } else if (code <= 0x7fffffffL) { PUTC(0xfc | (code >> 30)); PUTC2(code >> 24); PUTC2(code >> 18); PUTC2(code >> 12); PUTC2(code >> 6); PUTC2(code); } else return NO; return YES; } /* * This function converts a Unicode (UCode_t) value * to a multibyte UTF-8 character, which is loaded * into the buffer received as an argument. The * buffer should be large enough to hold at least * seven characters (but should be declared as 8 * to minimize byte alignment problems with some * compilers). - FM */ BOOL UCConvertUniToUtf8(UCode_t code, char *buffer) { char *ch = buffer; if (!ch) return NO; if (code <= 0 || code > 0x7fffffffL) { *ch = '\0'; return NO; } if (code < 0x800L) { *ch++ = (char) (0xc0 | (code >> 6)); *ch++ = (char) (0x80 | (0x3f & (code))); *ch = '\0'; } else if (code < 0x10000L) { *ch++ = (char) (0xe0 | (code >> 12)); *ch++ = (char) (0x80 | (0x3f & (code >> 6))); *ch++ = (char) (0x80 | (0x3f & (code))); *ch = '\0'; } else if (code < 0x200000L) { *ch++ = (char) (0xf0 | (code >> 18)); *ch++ = (char) (0x80 | (0x3f & (code >> 12))); *ch++ = (char) (0x80 | (0x3f & (code >> 6))); *ch++ = (char) (0x80 | (0x3f & (code))); *ch = '\0'; } else if (code < 0x4000000L) { *ch++ = (char) (0xf8 | (code >> 24)); *ch++ = (char) (0x80 | (0x3f & (code >> 18))); *ch++ = (char) (0x80 | (0x3f & (code >> 12))); *ch++ = (char) (0x80 | (0x3f & (code >> 6))); *ch++ = (char) (0x80 | (0x3f & (code))); *ch = '\0'; } else { *ch++ = (char) (0xfc | (code >> 30)); *ch++ = (char) (0x80 | (0x3f & (code >> 24))); *ch++ = (char) (0x80 | (0x3f & (code >> 18))); *ch++ = (char) (0x80 | (0x3f & (code >> 12))); *ch++ = (char) (0x80 | (0x3f & (code >> 6))); *ch++ = (char) (0x80 | (0x3f & (code))); *ch = '\0'; } return YES; } /* * Get UCS character code for one character from UTF-8 encoded string. * * On entry: * *ppuni should point to beginning of UTF-8 encoding character * On exit: * *ppuni is advanced to point to the last byte of UTF-8 sequence, * if there was a valid one; otherwise unchanged. * returns the UCS value * returns negative value on error (invalid UTF-8 sequence) */ UCode_t UCGetUniFromUtf8String(char **ppuni) { UCode_t uc_out = 0; char *p = *ppuni; int utf_count, i; if (!(**ppuni & 0x80)) return (UCode_t) **ppuni; /* ASCII range character */ else if (!(**ppuni & 0x40)) return (-1); /* not a valid UTF-8 start */ if ((*p & 0xe0) == 0xc0) { utf_count = 1; } else if ((*p & 0xf0) == 0xe0) { utf_count = 2; } else if ((*p & 0xf8) == 0xf0) { utf_count = 3; } else if ((*p & 0xfc) == 0xf8) { utf_count = 4; } else if ((*p & 0xfe) == 0xfc) { utf_count = 5; } else { /* garbage */ return (-1); } for (p = *ppuni, i = 0; i < utf_count; i++) { if ((*(++p) & 0xc0) != 0x80) return (-1); } p = *ppuni; switch (utf_count) { case 1: uc_out = (((*p & 0x1f) << 6) | (*(p + 1) & 0x3f)); break; case 2: uc_out = (((((*p & 0x0f) << 6) | (*(p + 1) & 0x3f)) << 6) | (*(p + 2) & 0x3f)); break; case 3: uc_out = (((((((*p & 0x07) << 6) | (*(p + 1) & 0x3f)) << 6) | (*(p + 2) & 0x3f)) << 6) | (*(p + 3) & 0x3f)); break; case 4: uc_out = (((((((((*p & 0x03) << 6) | (*(p + 1) & 0x3f)) << 6) | (*(p + 2) & 0x3f)) << 6) | (*(p + 3) & 0x3f)) << 6) | (*(p + 4) & 0x3f)); break; case 5: uc_out = (((((((((((*p & 0x01) << 6) | (*(p + 1) & 0x3f)) << 6) | (*(p + 2) & 0x3f)) << 6) | (*(p + 3) & 0x3f)) << 6) | (*(p + 4) & 0x3f)) << 6) | (*(p + 5) & 0x3f)); break; } *ppuni = p + utf_count; return uc_out; }