--- freem/src/mdebug.c	2025/04/29 18:46:17	1.5
+++ freem/src/mdebug.c	2025/04/30 14:41:03	1.6
@@ -1,5 +1,5 @@
 /*
- *   $Id: mdebug.c,v 1.5 2025/04/29 18:46:17 snw Exp $
+ *   $Id: mdebug.c,v 1.6 2025/04/30 14:41:03 snw Exp $
  *    debugger enhancements
  *
  *  
@@ -24,6 +24,9 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: mdebug.c,v $
+ *   Revision 1.6  2025/04/30 14:41:03  snw
+ *   Further debugger work
+ *
  *   Revision 1.5  2025/04/29 18:46:17  snw
  *   Begin work on interactive debugger
  *
@@ -98,17 +101,23 @@ void dbg_init (void)
 
 }
 
-int debugger (void)
+int debugger (int entry_mode, char *curcode)
 {
     
 #if defined(HAVE_LIBREADLINE)    
     static int first_entry = TRUE;
+    static int stepmode = STEPMODE_NONE;
+    
     char *dbg_buf;
     char dbg_prompt[256];
     HIST_ENTRY **dbg_hist;
     int dbg_hist_idx;
     HIST_ENTRY *dbg_hist_ent;
     char rouname_buf[256];
+    char *savptr;
+    char *dbg_cmd;
+    int do_prompt = FALSE;
+    register int i;
     
     set_io (UNIX);
     
@@ -117,24 +126,99 @@ int debugger (void)
         
         printf ("\nEntering debug mode; M commands unavailable.\n");
         printf ("Type 'exit' to return to direct mode; 'help' for help.\n\n");
+
+        do_prompt = TRUE;
     }
+    else {
+        switch (entry_mode) {
+            
+            case DEBENTRY_CMD:
+                if (stepmode == STEPMODE_CMD) {
+                    do_prompt = TRUE;
+                }
+                else {
+                    do_prompt = FALSE;
+                }
+                    
+                break;
+                    
+            case DEBENTRY_LINE:
+                if (stepmode == STEPMODE_CMD || stepmode == STEPMODE_LINE) {
+                    do_prompt = TRUE;
+                }
+                else {
+                    do_prompt = FALSE;
+                }
+                
+                break;
+                
+            case DEBENTRY_BREAKPOINT:
+                do_prompt = TRUE;
+                break;
+                
+            case DEBENTRY_SIGINT:
+                break;
+        }
+    }
+
+
+    if (!do_prompt) return TRUE;
 
     while (1) {
-        stcpy (rouname_buf, rou_name);
+        
+        //stcpy (rouname_buf, rou_name);
+        getraddress (rouname_buf, nstx);
         stcnv_m2c (rouname_buf);
         
         snprintf (dbg_prompt, sizeof (dbg_prompt) - 1, "%s $STACK=%d [DEBUG]> ", rouname_buf, nstx);
 
+        if ((stepmode == STEPMODE_LINE) || (stepmode == STEPMODE_CMD)) {
+            char codbuf[512];
+            stcpy (codbuf, curcode);
+            stcnv_m2c (codbuf);
+            
+            printf ("%s\n", codbuf);
+        }
         dbg_buf = readline (dbg_prompt);
 
         if (!dbg_buf) continue;
 
-        if (strcmp (dbg_buf, "exit") == 0) {
+        savptr = dbg_buf;
+        dbg_cmd = strtok_r (dbg_buf, " ", &savptr);
+        
+        if ((strcmp (dbg_cmd, "exit") == 0) || (strcmp (dbg_cmd, "quit") == 0)) {
             first_entry = TRUE;
+            stepmode = STEPMODE_NONE;
             printf ("\n\nExiting debug mode.\n\n");
             set_io (MUMPS);
             return FALSE;
         }
+        else if ((strcmp (dbg_cmd, "step") == 0) || (strcmp (dbg_cmd, "s") == 0)) {
+            stepmode = STEPMODE_CMD;
+            return TRUE;
+        }
+        else if ((strcmp (dbg_cmd, "next") == 0) || (strcmp (dbg_cmd, "n") == 0)) {
+            stepmode = STEPMODE_LINE;
+            return TRUE;
+        }
+        else if ((strcmp (dbg_cmd, "continue") == 0) || (strcmp (dbg_cmd, "cont") == 0) || (strcmp(dbg_cmd, "c") == 0)) {
+            stepmode = STEPMODE_CONT;
+            return TRUE;
+        }
+        else if ((strcmp (dbg_cmd, "backtrace") == 0) || (strcmp (dbg_cmd, "bt") == 0)) {
+            char tmpbuf[256];
+
+            printf ("%-10s%s\n", "$STACK", "(CMND)ENTRY");
+            printf ("%-10s%s\n", "======", "===========");
+            
+            
+            for (i = 1; i <= nstx; i++) getraddress (callerr[i], i);
+            for (i = nstx; i > 0; i--) {
+                stcpy (tmpbuf, callerr[i]);
+                stcnv_m2c (tmpbuf);
+                printf ("%-10d%s\n", i, tmpbuf);
+            }
+        }
         else {
             printf ("DEBUG:  invalid command\r\n");
         }