git.distorted.org.uk Git - u/mdw/putty/blob - unix/uxucs.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <ctype.h>
   4 #include <locale.h>
   5 #include <limits.h>
   6 #include <wchar.h>
   7
   8 #include <time.h>
   9
  10 #include "putty.h"
  11 #include "terminal.h"
  12 #include "misc.h"
  13
  14 /*
  15  * Unix Unicode-handling routines.
  16  */
  17
  18 int is_dbcs_leadbyte(int codepage, char byte)
  19 {
  20     return 0;                          /* we don't do DBCS */
  21 }
  22
  23 int mb_to_wc(int codepage, int flags, char *mbstr, int mblen,
  24              wchar_t *wcstr, int wclen)
  25 {
  26     if (codepage == DEFAULT_CODEPAGE) {
  27         int n = 0;
  28         mbstate_t state = { 0 };
  29
  30         setlocale(LC_CTYPE, "");
  31
  32         while (mblen > 0) {
  33             size_t i = mbrtowc(wcstr+n, mbstr, (size_t)mblen, &state);
  34             if (i == (size_t)-1 || i == (size_t)-2)
  35                 break;
  36             n++;
  37             mbstr += i;
  38             mblen -= i;
  39         }
  40
  41         setlocale(LC_CTYPE, "C");
  42
  43         return n;
  44     } else if (codepage == CS_NONE) {
  45         int n = 0;
  46
  47         while (mblen > 0) {
  48             wcstr[n] = 0xD800 | (mbstr[0] & 0xFF);
  49             n++;
  50             mbstr++;
  51             mblen--;
  52         }
  53
  54         return n;
  55     } else
  56         return charset_to_unicode(&mbstr, &mblen, wcstr, wclen, codepage,
  57                                   NULL, NULL, 0);
  58 }
  59
  60 int wc_to_mb(int codepage, int flags, wchar_t *wcstr, int wclen,
  61              char *mbstr, int mblen, char *defchr, int *defused)
  62 {
  63     /* FIXME: we should remove the defused param completely... */
  64     if (defused)
  65         *defused = 0;
  66
  67     if (codepage == DEFAULT_CODEPAGE) {
  68         char output[MB_LEN_MAX];
  69         mbstate_t state = { 0 };
  70         int n = 0;
  71
  72         setlocale(LC_CTYPE, "");
  73
  74         while (wclen > 0) {
  75             int i = wcrtomb(output, wcstr[0], &state);
  76             if (i == (size_t)-1 || i > n - mblen)
  77                 break;
  78             memcpy(mbstr+n, output, i);
  79             n += i;
  80             wcstr++;
  81             wclen--;
  82         }
  83
  84         setlocale(LC_CTYPE, "C");
  85
  86         return n;
  87     } else if (codepage == CS_NONE) {
  88         int n = 0;
  89         while (wclen > 0 && n < mblen) {
  90             if (*wcstr >= 0xD800 && *wcstr < 0xD900)
  91                 mbstr[n++] = (*wcstr & 0xFF);
  92             else if (defchr)
  93                 mbstr[n++] = *defchr;
  94             wcstr++;
  95             wclen--;
  96         }
  97         return n;
  98     } else {
  99         return charset_from_unicode(&wcstr, &wclen, mbstr, mblen, codepage,
 100                                     NULL, defchr?defchr:NULL, defchr?1:0);
 101     }
 102 }
 103
 104 /*
 105  * Return value is TRUE if pterm is to run in direct-to-font mode.
 106  */
 107 int init_ucs(char *linecharset, int font_charset)
 108 {
 109     int i, ret = 0;
 110
 111     /*
 112      * In the platform-independent parts of the code, font_codepage
 113      * is used only for system DBCS support - which we don't
 114      * support at all. So we set this to something which will never
 115      * be used.
 116      */
 117     font_codepage = -1;
 118
 119     /*
 120      * line_codepage should be decoded from the specification in
 121      * cfg.
 122      */
 123     line_codepage = charset_from_mimeenc(linecharset);
 124     if (line_codepage == CS_NONE)
 125         line_codepage = charset_from_xenc(linecharset);
 126
 127     /*
 128      * If line_codepage is _still_ CS_NONE, we assume we're using
 129      * the font's own encoding. This has been passed in to us, so
 130      * we use that. If it's still CS_NONE after _that_ - i.e. the
 131      * font we were given had an incomprehensible charset - then we
 132      * fall back to using the D800 page.
 133      */
 134     if (line_codepage == CS_NONE)
 135         line_codepage = font_charset;
 136
 137     if (line_codepage == CS_NONE)
 138         ret = 1;
 139
 140     /*
 141      * Set up unitab_line, by translating each individual character
 142      * in the line codepage into Unicode.
 143      */
 144     for (i = 0; i < 256; i++) {
 145         char c[1], *p;
 146         wchar_t wc[1];
 147         int len;
 148         c[0] = i;
 149         p = c;
 150         len = 1;
 151         if (line_codepage == CS_NONE)
 152             unitab_line[i] = 0xD800 | i;
 153         else if (1 == charset_to_unicode(&p, &len, wc, 1, line_codepage,
 154                                          NULL, L"", 0))
 155             unitab_line[i] = wc[0];
 156         else
 157             unitab_line[i] = 0xFFFD;
 158     }
 159
 160     /*
 161      * Set up unitab_xterm. This is the same as unitab_line except
 162      * in the line-drawing regions, where it follows the Unicode
 163      * encoding.
 164      *
 165      * (Note that the strange X encoding of line-drawing characters
 166      * in the bottom 32 glyphs of ISO8859-1 fonts is taken care of
 167      * by the font encoding, which will spot such a font and act as
 168      * if it were in a variant encoding of ISO8859-1.)
 169      */
 170     for (i = 0; i < 256; i++) {
 171         static const wchar_t unitab_xterm_std[32] = {
 172             0x2666, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
 173             0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
 174             0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
 175             0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x0020
 176         };
 177         if (i >= 0x5F && i < 0x7F)
 178             unitab_xterm[i] = unitab_xterm_std[i & 0x1F];
 179         else
 180             unitab_xterm[i] = unitab_line[i];
 181     }
 182
 183     /*
 184      * Set up unitab_scoacs. The SCO Alternate Character Set is
 185      * simply CP437.
 186      */
 187     for (i = 0; i < 256; i++) {
 188         char c[1], *p;
 189         wchar_t wc[1];
 190         int len;
 191         c[0] = i;
 192         p = c;
 193         len = 1;
 194         if (1 == charset_to_unicode(&p, &len, wc, 1, CS_CP437, NULL, L"", 0))
 195             unitab_scoacs[i] = wc[0];
 196         else
 197             unitab_scoacs[i] = 0xFFFD;
 198     }
 199
 200     /*
 201      * Find the control characters in the line codepage. For
 202      * direct-to-font mode using the D800 hack, we assume 00-1F and
 203      * 7F are controls, but allow 80-9F through. (It's as good a
 204      * guess as anything; and my bet is that half the weird fonts
 205      * used in this way will be IBM or MS code pages anyway.)
 206      */
 207     for (i = 0; i < 256; i++) {
 208         int lineval = unitab_line[i];
 209         if (lineval < ' ' || (lineval >= 0x7F && lineval < 0xA0) ||
 210             (lineval >= 0xD800 && lineval < 0xD820) || (lineval == 0xD87F))
 211             unitab_ctrl[i] = i;
 212         else
 213             unitab_ctrl[i] = 0xFF;
 214     }
 215
 216     return ret;
 217 }