$NetBSD: patch-ah,v 1.1 1999/10/01 17:05:15 dmcmahill Exp $

--- src/bin/main.c.orig	Thu Jul 29 01:48:32 1993
+++ src/bin/main.c	Mon Mar  8 12:00:35 1999
@@ -25,6 +25,13 @@
 #include <pwd.h>
 #endif
 
+#ifdef HAS_GNUREADLINE
+/* Added GNU Readline Support 11/3/97 -- Andrew Veliath <veliaa@rpi.edu> */
+#include <readline/readline.h>
+#include <readline/history.h>
+#include "fteinput.h"
+#endif
+
 #ifdef HAS_UNIX_SIGS
 #include <signal.h>
 #endif
@@ -36,6 +43,11 @@
 #endif
 
 #include "patchlev.h"
+
+#ifdef __FreeBSD__
+#include <floatingpoint.h>
+#endif
+
 #include "suffix.h"
 
 int Patch_Level = PATCHLEVEL;
@@ -49,6 +61,11 @@
 bool ft_intrpt = false;     /* Set by the (void) signal handlers. */
 bool ft_setflag = false;    /* Don't abort after an interrupt. */
 
+#ifdef HAS_GNUREADLINE
+char gnu_history_file[512];
+static char *application_name;
+#endif
+
 struct variable *(*if_getparam)( );
 
 #ifdef BATCH
@@ -181,6 +198,89 @@
 
 #endif
 
+#ifdef HAS_GNUREADLINE
+/* Adapted ../lib/cp/lexical.c:prompt() for GNU Readline -- Andrew Veliath <veliaa@rpi.edu> */
+static char *
+prompt()
+{
+    static char pbuf[128];
+    char *p = pbuf, *s;
+
+    if (cp_interactive == false)
+        return;
+    if (cp_promptstring == NULL)
+        s = "-> ";
+    else
+        s = cp_promptstring;
+    if (cp_altprompt)
+        s = cp_altprompt;
+    while (*s) {
+        switch (strip(*s)) {
+	case '!':
+	    p += sprintf(p, "%d", where_history() + 1);
+	    break;
+	case '\\':
+	    if (*(s + 1)) 
+		p += sprintf(p, "%c", strip(*++s));
+	default:
+	    *p = strip(*s); ++p;
+	    break;
+        }
+        s++;
+    }
+    *p = 0;
+    return pbuf;
+}
+
+/* Process device events in Readline's hook since there is no where
+   else to do it now - AV */
+int rl_event_func()
+{
+    static REQUEST reqst = { checkup_option, 0 };
+    Input(&reqst, NULL);
+    return 0;
+}
+
+/* Added GNU Readline Support -- Andrew Veliath <veliaa@rpi.edu> */
+void app_rl_readlines()
+{
+    char *line, *expanded_line;
+
+    strcpy(gnu_history_file, getenv("HOME"));
+    strcat(gnu_history_file, "/.");
+    strcat(gnu_history_file, application_name);
+    strcat(gnu_history_file, "_history");
+
+    using_history();
+    read_history(gnu_history_file);
+
+    rl_readline_name = application_name;
+    rl_instream = cp_in;
+    rl_outstream = cp_out;
+    rl_event_hook = rl_event_func;
+	
+    while (1) {
+	history_set_pos(history_length);
+	line = readline(prompt());
+	if (line && *line) {
+	    int s = history_expand(line, &expanded_line);
+		    
+	    if (s == 2) {
+		fprintf(stderr, "-> %s\n", expanded_line);
+	    } else if (s == -1) {
+		fprintf(stderr, "readline: %s\n", expanded_line);
+	    } else {
+		cp_evloop(expanded_line);
+		add_history(expanded_line);
+	    }
+	    free(expanded_line);
+	}
+	if (line) free(line);
+    }
+    /* History gets written in ../fte/misccoms.c com_quit */
+}
+#endif /* HAS_GNUREADLINE */
+
 char *hlp_filelist[] = { "spice", 0 };
 
 void
@@ -210,6 +310,10 @@
 
 #endif
 
+#ifdef __FreeBSD__
+    fpsetmask(fpgetmask() & ~FP_X_INV);
+#endif
+
     /* MFB tends to jump to 0 on errors.  This tends to catch it. */
     if (started) {
         fprintf(cp_err, "main: Internal Error: jump to zero\n");
@@ -217,6 +321,13 @@
     }
     started = true;
 
+#ifdef HAS_GNUREADLINE
+    if (!(application_name = strrchr(av[0],'/')))
+        application_name = av[0];
+    else
+        ++application_name;
+#endif
+
 #ifdef HAS_MAC_ARGCARGV
     ac = initmac(&av);
 #endif
@@ -393,7 +504,11 @@
 #  ifdef HAS_UNIX_SIGS
     /* Set up (void) signal handling */
     if (!ft_batchmode) {
+#    ifdef HAS_GNUREADLINE
+        (void) signal(SIGINT, SIG_IGN);
+#    else
         (void) signal(SIGINT, ft_sigintr);
+#    endif
         (void) signal(SIGFPE, sigfloat);
 #    ifdef SIGTSTP
         (void) signal(SIGTSTP, sigstop);
@@ -588,7 +703,11 @@
     } else {
         (void) setjmp(jbuf);
         cp_interactive = true;
+#ifdef HAS_GNUREADLINE
+	app_rl_readlines();
+#else
 	while (cp_evloop((char *) NULL) == 1) ;
+#endif /* ifelse HAS_GNUREADLINE */
     }
 
 #  else /* if BATCH */
@@ -627,7 +746,11 @@
     /* Nutmeg "main" */
     (void) setjmp(jbuf);
     cp_interactive = true;
+#ifdef HAS_GNUREADLINE
+    app_rl_readlines();
+#else
     while (cp_evloop((char *) NULL) == 1) ;
+#endif /* ifelse HAS_GNUREADLINE */
 
 #endif