Add an option to use wcwidth_cjk() instead of wcwidth(), as several people

have asked for it.

[originally from svn r5542]

config.c

@@ -1282,6 +1282,11 @@ void setup_config_box(struct controlbox *b, struct sesslist *sesslist,
 		  'r', 100, HELPCTX(translation_codepage),
 		  codepage_handler, P(NULL), P(NULL));
 
+    s = ctrl_getset(b, "Window/Translation", "tweaks", NULL);
+    ctrl_checkbox(s, "Treat CJK ambiguous characters as wide", 'w',
+		  HELPCTX(translation_cjk_ambig_wide),
+		  dlg_stdcheckbox_handler, I(offsetof(Config,cjk_ambig_wide)));
+
     str = dupprintf("Adjust how %s handles line drawing characters", appname);
     s = ctrl_getset(b, "Window/Translation", "linedraw", str);
     sfree(str);

doc/config.but

@@ -1213,6 +1213,24 @@ its name manually (\c{CP866} for example) in the list box. If the
 underlying version of Windows has the appropriate translation table
 installed, PuTTY will use it.
 
+\S{config-cjk-ambig-wide} \q{Treat CJK ambiguous characters as wide}
+
+\cfg{winhelp-topic}{translation.cjkambigwide}
+
+There are \I{East Asian Ambiguous characters}some Unicode characters
+whose width is not well-defined. In most contexts, such characters
+should be treated as single-width for the purposes of wrapping and so
+on; however, in some CJK contexts, they are better treated as
+double-width for historical reasons, and some server-side applications
+may expect them to be displayed as such. Setting this option will
+cause PuTTY to take the double-width interpretation. 
+
+If you use legacy CJK applications, and you find your lines are
+wrapping in the wrong places, or you are having other display
+problems, you might want to play with this setting.
+
+This option only has any effect in UTF-8 mode (see \k{config-charset}).
+
 \S{config-cyr} \q{Caps Lock acts as Cyrillic switch}
 
 \cfg{winhelp-topic}{translation.cyrillic}

putty.h

@@ -525,6 +525,7 @@ struct config_tag {
     /* translations */
     int vtmode;
     char line_codepage[128];
+    int cjk_ambig_wide;
     int utf8_override;
     int xlat_capslockcyr;
     /* X11 forwarding */
@@ -869,6 +870,8 @@ void get_unitab(int codepage, wchar_t * unitab, int ftype);
  */
 int wcwidth(wchar_t ucs);
 int wcswidth(const wchar_t *pwcs, size_t n);
+int wcwidth_cjk(wchar_t ucs);
+int wcswidth_cjk(const wchar_t *pwcs, size_t n);
 
 /*
  * Exports from mscrypto.c

settings.c

@@ -339,6 +339,7 @@ void save_open_settings(void *sesskey, int do_host, Config *cfg)
 	write_setting_s(sesskey, buf, buf2);
     }
     write_setting_s(sesskey, "LineCodePage", cfg->line_codepage);
+    write_setting_i(sesskey, "CJKAmbigWide", cfg->cjk_ambig_wide);
     write_setting_i(sesskey, "UTF8Override", cfg->utf8_override);
     write_setting_s(sesskey, "Printer", cfg->printer);
     write_setting_i(sesskey, "CapsLockCyr", cfg->xlat_capslockcyr);
@@ -666,6 +667,7 @@ void load_open_settings(void *sesskey, int do_host, Config *cfg)
      */
     gpps(sesskey, "LineCodePage", "", cfg->line_codepage,
 	 sizeof(cfg->line_codepage));
+    gppi(sesskey, "CJKAmbigWide", 0, &cfg->cjk_ambig_wide);
     gppi(sesskey, "UTF8Override", 1, &cfg->utf8_override);
     gpps(sesskey, "Printer", "", cfg->printer, sizeof(cfg->printer));
     gppi (sesskey, "CapsLockCyr", 0, &cfg->xlat_capslockcyr);

terminal.c

@@ -2845,7 +2845,9 @@ static void term_out(Terminal *term)
 		    if (DIRECT_CHAR(c))
 			width = 1;
 		    if (!width)
-			width = wcwidth((wchar_t) c);
+			width = (term->cfg.cjk_ambig_wide ?
+				 wcwidth_cjk((wchar_t) c) :
+				 wcwidth((wchar_t) c));
 
 		    if (term->wrapnext && term->wrap && width > 0) {
 			cline->lattr |= LATTR_WRAPPED;

testdata/utf8.txt

@@ -19,3 +19,5 @@ Arabic and bidirectional text:
                عن جرير رضي الله عنه قال قال رسول الله صلى الله عليه
           وسلم: بني الاسلام على خمس شهادة ان لا اله الا الله واقام              
 Mixed LTR and RTL text: جرير رضي back to LTR.
+
+East Asian Ambiguous characters: ¼½¾¼½¾¼½¾¼½¾¼½¾¼½¾¼½¾¼½¾¼½¾¼½¾

wcwidth.c

@@ -146,7 +146,6 @@ int wcswidth(const wchar_t *pwcs, size_t n)
   return width;
 }
 
-#if 0 /* RDB: we don't need the cjk version */
 /*
  * The following function is the same as wcwidth(), except that
  * spacing characters in the East Asian Ambiguous (A) category as
@@ -155,7 +154,7 @@ int wcswidth(const wchar_t *pwcs, size_t n)
  * encodings who want to migrate to UCS. It is not otherwise
  * recommended for general use.
  */
-static int wcwidth_cjk(wchar_t ucs)
+int wcwidth_cjk(wchar_t ucs)
 {
   /* sorted list of non-overlapping intervals of East Asian Ambiguous
    * characters */
@@ -233,4 +232,3 @@ int wcswidth_cjk(const wchar_t *pwcs, size_t n)
 
   return width;
 }
-#endif

windows/wincfg.c

@@ -177,8 +177,7 @@ void win_setup_config_box(struct controlbox *b, HWND *hwndp, int has_help,
      * the least we can do is ensure it never makes it to any other
      * platform (at least unless someone fixes it!).
      */
-    s = ctrl_getset(b, "Window/Translation", "input",
-		    "Enable character set translation on input data");
+    s = ctrl_getset(b, "Window/Translation", "tweaks", NULL);
     ctrl_checkbox(s, "Caps Lock acts as Cyrillic switch", 's',
 		  HELPCTX(translation_cyrillic),
 		  dlg_stdcheckbox_handler,

windows/winhelp.h

@@ -112,6 +112,7 @@
 #define WINHELP_CTX_colours_logpal "colours.logpal"
 #define WINHELP_CTX_colours_config "colours.config"
 #define WINHELP_CTX_translation_codepage "translation.codepage"
+#define WINHELP_CTX_translation_cjk_ambig_wide "translation.cjkambigwide"
 #define WINHELP_CTX_translation_cyrillic "translation.cyrillic"
 #define WINHELP_CTX_translation_linedraw "translation.linedraw"
 #define WINHELP_CTX_ssh_tunnels_x11 "ssh.tunnels.x11"