Fix the display of utf8 sequences in the gui

term_addstr() had a long-standing fixme that suggested it didn't
take into account the string encoding when calculating the string
length.
The BIG5 code path is untested.

src/fe-common/core/utf8.h

@@ -8,6 +8,8 @@
 #define is_big5_hi(hi)  (0x81 <= (hi) && (hi) <= 0xFE)
 #define is_big5(hi,lo) (is_big5_hi(hi) && is_big5_lo(lo))
 
+int strlen_big5(const unsigned char *str);
+
 /* Returns width for character (0-2). */
 int mk_wcwidth(unichar c);
 

src/fe-text/gui-printtext.c

@@ -220,16 +220,15 @@ static void sig_gui_print_text(WINDOW_REC *window, void *fgcolor,
 	get_colors(flags, &fg, &bg, &attr);
 
 	if (window == NULL) {
-                g_return_if_fail(next_xpos != -1);
+		g_return_if_fail(next_xpos != -1);
 
 		term_set_color2(root_window, attr, fg, bg);
 
 		term_move(root_window, next_xpos, next_ypos);
 		if (flags & GUI_PRINT_FLAG_CLRTOEOL)
 			term_clrtoeol(root_window);
-		term_addstr(root_window, str);
+		next_xpos += term_addstr(root_window, str);
-		next_xpos += strlen(str); /* FIXME utf8 or big5 */
+		return;
-                return;
 	}
 
 	lineinfo.level = dest == NULL ? 0 : dest->level;

src/fe-text/term-terminfo.c

@@ -522,15 +522,60 @@ void term_add_unichar(TERM_WINDOW *window, unichar chr)
 	}
 }
 
-void term_addstr(TERM_WINDOW *window, const char *str)
+int term_addstr(TERM_WINDOW *window, const char *str)
 {
-	int len;
+	int i, len, raw_len;
+	unichar *tmp;
+	const char *ptr;
 
 	if (vcmove) term_move_real();
-	len = strlen(str); /* FIXME utf8 or big5 */
+
+	raw_len = strlen(str);
+
+	/* The string length depends on the terminal encoding */
+	switch (term_type) {
+	case TERM_TYPE_BIG5:
+		len = strlen_big5((const unsigned char *)str);
+		break;
+	case TERM_TYPE_UTF8:
+		len = g_utf8_strlen(str, -1);
+		break;
+	default:
+		len = strlen(str);
+		break;
+	}
+
+	tmp = calloc(len, sizeof(unichar));
+	if (tmp == NULL)
+	    return 0;
+
+	switch (term_type) {
+	case TERM_TYPE_BIG5:
+	    big5_to_unichars(str, tmp);
+	    break;
+	case TERM_TYPE_UTF8:
+	    ptr = str;
+	    for (i = 0; i < len; i++) {
+		tmp[i] = g_utf8_get_char(ptr);
+		ptr = g_utf8_next_char(ptr);
+	    }
+	    break;
+	default:
+	    for (i = 0; i < len; i++)
+		tmp[i] = str[i];
+	}
+
+	for (len = i = 0; i < len; i++)
+	    len += unichar_isprint(tmp[i]) ? mk_wcwidth(tmp[i]) : 1;
+
+	free(tmp);
+
         term_printed_text(len);
 
-	fwrite(str, 1, len, window->term->out);
+	/* Use strlen() here since we need the number of raw bytes */
+	fwrite(str, 1, raw_len, window->term->out);
+
+	return len;
 }
 
 void term_clrtoeol(TERM_WINDOW *window)

src/fe-text/term.h

@@ -83,7 +83,7 @@ void term_set_color(TERM_WINDOW *window, int col);
 void term_move(TERM_WINDOW *window, int x, int y);
 void term_addch(TERM_WINDOW *window, char chr);
 void term_add_unichar(TERM_WINDOW *window, unichar chr);
-void term_addstr(TERM_WINDOW *window, const char *str);
+int  term_addstr(TERM_WINDOW *window, const char *str);
 void term_clrtoeol(TERM_WINDOW *window);
 
 void term_move_cursor(int x, int y);