Support wide Curses on MS-DOS

Also, fix IBMGraphics on Curses

win/curses/cursmain.c

@@ -154,11 +154,30 @@ curses_init_nhwindows(int *argcp UNUSED,
                       char **argv UNUSED)
 {
 #ifdef PDCURSES
+    static char pdc_font[BUFSZ] = "";
     char window_title[BUFSZ];
 #endif
 
 #ifdef CURSES_UNICODE
     setlocale(LC_CTYPE, "");
+#ifdef PDCURSES
+    /* Assume the DOSVGA port of PDCursesMod, or the SDL1 or SDL2 port of
+       either PDCurses or PDCursesMod. Honor the font_map option to set
+       a font.
+       On MS-DOS, if no font_map is set, use ter-u16v.psf if it is present.
+       PDC_FONT has no effect on other PDCurses or PDCursesMod ports. */
+    if (iflags.wc_font_map && iflags.wc_font_map[0]) {
+        Snprintf(pdc_font, sizeof(pdc_font), "PDC_FONT=%s",
+                 iflags.wc_font_map);
+#ifdef MSDOS
+    } else if (access("ter-u16v.psf", R_OK) >= 0) {
+        Snprintf(pdc_font, sizeof(pdc_font), "PDC_FONT=ter-u16v.psf");
+#endif
+    }
+    if (pdc_font[0] != '\0') {
+        putenv(pdc_font);
+    }
+#endif
 #endif
 
 #ifdef XCURSES