early arg support for older platforms

The startup had fallen behind NetHack 5.0 startup for other platforms,
and lacked support for some of the early command line options.

Following this, if PC_EARLY_OPTIONS is defined in pcconf.h, the
port will support those options, such as --version, --showpaths,
--dumpenums, etc.)

Currently, MSDOS #defines's PC_EARLY_OPTIONS, but AMIGA, ATARI,
and MAC68K do not.

include/pcconf.h

@@ -148,9 +148,13 @@
                              LEVELDIR, SAVEDIR, BONESDIR, DATADIR,         \
                              SCOREDIR, LOCKDIR, CONFIGDIR, and TROUBLEDIR. \
                              */
-
 #endif /* MSDOS configuration stuff */
 
+/* include early argument processing --dumpenums etc. */
+#if defined(MSDOS)
+#define PC_EARLY_OPTIONS
+#endif
+
 #ifndef PATHLEN
 #define PATHLEN 64  /* maximum pathlength */
 #endif

sys/share/pcmain.c

@@ -116,6 +116,10 @@ _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);*/
     startup();
 #endif
 
+#if defined(PC_EARLY_OPTIONS)
+  program_state.early_options = 1;
+#endif
+
 #ifdef TOS
     if (*argv[0]) { /* only a CLI can give us argv[0] */
         gh.hname = argv[0];
@@ -124,6 +128,9 @@ _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);*/
 #endif
         gh.hname = "NetHack"; /* used for syntax messages */
 
+#if defined(PC_EARLY_OPTIONS)
+    early_init(argc, argv);
+#endif
     choose_windows(DEFAULT_WINDOW_SYS);
 
 
@@ -266,6 +273,12 @@ _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);*/
 #endif
     ami_wininit_data(WININIT);
 #endif
+
+#if defined(PC_EARLY_OPTIONS)
+    early_options(&argc, &argv, &dir);
+    program_state.early_options = 0;
+#endif
+
     initoptions();
 
 #ifdef NOCWD_ASSUMPTIONS

sys/share/pcsys.c

@@ -155,8 +155,11 @@ getreturn(const char *str)
     msmsg("Hit <Enter> %s.", str);
 #endif
 #endif
-    while (pgetchar() != '\n')
-        ;
+#if defined(PC_EARLY_OPTIONS)
+    if (isatty(STDOUT_FILENO))
+#endif
+        while (pgetchar() != '\n')
+            ;
     return;
 }