import gdb-1999-06-21 snapshot

1 files changed, 2621 insertions, 1 deletions

diff --git a/gdb/top.c b/gdb/top.c
index 1f2a217..af5c40b 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -33,7 +33,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #include "terminal.h" /* For job_control.  */
 #include "annotate.h"
 #include "top.h"
-#include "event-loop.h"
 
 /* readline include files */
 #include <readline/readline.h>
@@ -47,6 +46,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #include <unistd.h>
 #endif
 
+#include "event-loop.h"
 #include "gdb_string.h"
 #include "gdb_stat.h"
 #include <ctype.h>
@@ -1422,3 +1422,2623 @@ command_loop ()
     }
 }
 
+
+/* Commands call this if they do not want to be repeated by null lines.  */
+
+void
+dont_repeat ()
+{
+  if (server_command)
+    return;
+
+  /* If we aren't reading from standard input, we are saving the last
+     thing read from stdin in line and don't want to delete it.  Null lines
+     won't repeat here in any case.  */
+  if (instream == stdin)
+    *line = 0;
+}
+
+/* Read a line from the stream "instream" without command line editing.
+
+   It prints PROMPT_ARG once at the start.
+   Action is compatible with "readline", e.g. space for the result is
+   malloc'd and should be freed by the caller.
+
+   A NULL return means end of file.  */
+char *
+gdb_readline (prompt_arg)
+     char *prompt_arg;
+{
+  int c;
+  char *result;
+  int input_index = 0;
+  int result_size = 80;
+
+  if (prompt_arg)
+    {
+      /* Don't use a _filtered function here.  It causes the assumed
+	 character position to be off, since the newline we read from
+	 the user is not accounted for.  */
+      fputs_unfiltered (prompt_arg, gdb_stdout);
+#ifdef MPW
+      /* Move to a new line so the entered line doesn't have a prompt
+	 on the front of it. */
+      fputs_unfiltered ("\n", gdb_stdout);
+#endif /* MPW */
+      gdb_flush (gdb_stdout);
+    }
+
+  result = (char *) xmalloc (result_size);
+
+  while (1)
+    {
+      /* Read from stdin if we are executing a user defined command.
+	 This is the right thing for prompt_for_continue, at least.  */
+      c = fgetc (instream ? instream : stdin);
+
+      if (c == EOF)
+	{
+	  if (input_index > 0)
+	    /* The last line does not end with a newline.  Return it, and
+	       if we are called again fgetc will still return EOF and
+	       we'll return NULL then.  */
+	    break;
+	  free (result);
+	  return NULL;
+	}
+
+      if (c == '\n')
+#ifndef CRLF_SOURCE_FILES
+	break;
+#else
+	{
+	  if (input_index > 0 && result[input_index - 1] == '\r')
+	    input_index--;
+	  break;
+	}
+#endif
+
+      result[input_index++] = c;
+      while (input_index >= result_size)
+	{
+	  result_size *= 2;
+	  result = (char *) xrealloc (result, result_size);
+	}
+    }
+
+  result[input_index++] = '\0';
+  return result;
+}
+
+/* Variables which control command line editing and history
+   substitution.  These variables are given default values at the end
+   of this file.  */
+static int command_editing_p;
+/* NOTE 1999-04-29: This variable will be static again, once we modify
+   gdb to use the event loop as the default command loop and we merge
+   event-top.c into this file, top.c */
+/* static */ int history_expansion_p;
+static int write_history_p;
+static int history_size;
+static char *history_filename;
+
+/* readline uses the word breaks for two things:
+   (1) In figuring out where to point the TEXT parameter to the
+   rl_completion_entry_function.  Since we don't use TEXT for much,
+   it doesn't matter a lot what the word breaks are for this purpose, but
+   it does affect how much stuff M-? lists.
+   (2) If one of the matches contains a word break character, readline
+   will quote it.  That's why we switch between
+   gdb_completer_word_break_characters and
+   gdb_completer_command_word_break_characters.  I'm not sure when
+   we need this behavior (perhaps for funky characters in C++ symbols?).  */
+
+/* Variables which are necessary for fancy command line editing.  */
+char *gdb_completer_word_break_characters =
+  " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-";
+
+/* When completing on command names, we remove '-' from the list of
+   word break characters, since we use it in command names.  If the
+   readline library sees one in any of the current completion strings,
+   it thinks that the string needs to be quoted and automatically supplies
+   a leading quote. */
+char *gdb_completer_command_word_break_characters =
+  " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,";
+
+/* Characters that can be used to quote completion strings.  Note that we
+   can't include '"' because the gdb C parser treats such quoted sequences
+   as strings. */
+char *gdb_completer_quote_characters =
+  "'";
+
+/* Functions that are used as part of the fancy command line editing.  */
+
+/* This can be used for functions which don't want to complete on symbols
+   but don't want to complete on anything else either.  */
+/* ARGSUSED */
+char **
+noop_completer (text, prefix)
+     char *text;
+     char *prefix;
+{
+  return NULL;
+}
+
+/* Complete on filenames.  */
+char **
+filename_completer (text, word)
+     char *text;
+     char *word;
+{
+  /* From readline.  */
+  extern char *filename_completion_function PARAMS ((char *, int));
+  int subsequent_name;
+  char **return_val;
+  int return_val_used;
+  int return_val_alloced;
+
+  return_val_used = 0;
+  /* Small for testing.  */
+  return_val_alloced = 1;
+  return_val = (char **) xmalloc (return_val_alloced * sizeof (char *));
+
+  subsequent_name = 0;
+  while (1)
+    {
+      char *p;
+      p = filename_completion_function (text, subsequent_name);
+      if (return_val_used >= return_val_alloced)
+	{
+	  return_val_alloced *= 2;
+	  return_val =
+	    (char **) xrealloc (return_val,
+				return_val_alloced * sizeof (char *));
+	}
+      if (p == NULL)
+	{
+	  return_val[return_val_used++] = p;
+	  break;
+	}
+      /* Like emacs, don't complete on old versions.  Especially useful
+	 in the "source" command.  */
+      if (p[strlen (p) - 1] == '~')
+	continue;
+
+      {
+	char *q;
+	if (word == text)
+	  /* Return exactly p.  */
+	  return_val[return_val_used++] = p;
+	else if (word > text)
+	  {
+	    /* Return some portion of p.  */
+	    q = xmalloc (strlen (p) + 5);
+	    strcpy (q, p + (word - text));
+	    return_val[return_val_used++] = q;
+	    free (p);
+	  }
+	else
+	  {
+	    /* Return some of TEXT plus p.  */
+	    q = xmalloc (strlen (p) + (text - word) + 5);
+	    strncpy (q, word, text - word);
+	    q[text - word] = '\0';
+	    strcat (q, p);
+	    return_val[return_val_used++] = q;
+	    free (p);
+	  }
+      }
+      subsequent_name = 1;
+    }
+#if 0
+  /* There is no way to do this just long enough to affect quote inserting
+     without also affecting the next completion.  This should be fixed in
+     readline.  FIXME.  */
+  /* Insure that readline does the right thing
+     with respect to inserting quotes.  */
+  rl_completer_word_break_characters = "";
+#endif
+  return return_val;
+}
+
+/* Here are some useful test cases for completion.  FIXME: These should
+   be put in the test suite.  They should be tested with both M-? and TAB.
+
+   "show output-" "radix"
+   "show output" "-radix"
+   "p" ambiguous (commands starting with p--path, print, printf, etc.)
+   "p "  ambiguous (all symbols)
+   "info t foo" no completions
+   "info t " no completions
+   "info t" ambiguous ("info target", "info terminal", etc.)
+   "info ajksdlfk" no completions
+   "info ajksdlfk " no completions
+   "info" " "
+   "info " ambiguous (all info commands)
+   "p \"a" no completions (string constant)
+   "p 'a" ambiguous (all symbols starting with a)
+   "p b-a" ambiguous (all symbols starting with a)
+   "p b-" ambiguous (all symbols)
+   "file Make" "file" (word break hard to screw up here)
+   "file ../gdb.stabs/we" "ird" (needs to not break word at slash)
+   */
+
+/* Generate completions one by one for the completer.  Each time we are
+   called return another potential completion to the caller.
+   line_completion just completes on commands or passes the buck to the
+   command's completer function, the stuff specific to symbol completion
+   is in make_symbol_completion_list.
+
+   TEXT is the caller's idea of the "word" we are looking at.
+
+   MATCHES is the number of matches that have currently been collected from
+   calling this completion function.  When zero, then we need to initialize,
+   otherwise the initialization has already taken place and we can just
+   return the next potential completion string.
+
+   LINE_BUFFER is available to be looked at; it contains the entire text
+   of the line.  POINT is the offset in that line of the cursor.  You
+   should pretend that the line ends at POINT.
+
+   Returns NULL if there are no more completions, else a pointer to a string
+   which is a possible completion, it is the caller's responsibility to
+   free the string.  */
+
+static char *
+line_completion_function (text, matches, line_buffer, point)
+     char *text;
+     int matches;
+     char *line_buffer;
+     int point;
+{
+  static char **list = (char **)NULL;		/* Cache of completions */
+  static int index;				/* Next cached completion */
+  char *output = NULL;
+  char *tmp_command, *p;
+  /* Pointer within tmp_command which corresponds to text.  */
+  char *word;
+  struct cmd_list_element *c, *result_list;
+
+  if (matches == 0)
+    {
+      /* The caller is beginning to accumulate a new set of completions, so
+	 we need to find all of them now, and cache them for returning one at
+	 a time on future calls. */
+
+      if (list)
+	{
+	  /* Free the storage used by LIST, but not by the strings inside.
+	     This is because rl_complete_internal () frees the strings. */
+	  free ((PTR)list);
+	}
+      list = 0;
+      index = 0;
+
+      /* Choose the default set of word break characters to break completions.
+	 If we later find out that we are doing completions on command strings
+	 (as opposed to strings supplied by the individual command completer
+	 functions, which can be any string) then we will switch to the
+	 special word break set for command strings, which leaves out the
+	 '-' character used in some commands.  */
+
+      rl_completer_word_break_characters =
+	  gdb_completer_word_break_characters;
+
+      /* Decide whether to complete on a list of gdb commands or on symbols. */
+      tmp_command = (char *) alloca (point + 1);
+      p = tmp_command;
+
+      strncpy (tmp_command, line_buffer, point);
+      tmp_command[point] = '\0';
+      /* Since text always contains some number of characters leading up
+	 to point, we can find the equivalent position in tmp_command
+	 by subtracting that many characters from the end of tmp_command.  */
+      word = tmp_command + point - strlen (text);
+
+      if (point == 0)
+	{
+	  /* An empty line we want to consider ambiguous; that is, it
+	     could be any command.  */
+	  c = (struct cmd_list_element *) -1;
+	  result_list = 0;
+	}
+      else
+	{
+	  c = lookup_cmd_1 (&p, cmdlist, &result_list, 1);
+	}
+
+      /* Move p up to the next interesting thing.  */
+      while (*p == ' ' || *p == '\t')
+	{
+	  p++;
+	}
+
+      if (!c)
+	{
+	  /* It is an unrecognized command.  So there are no
+	     possible completions.  */
+	  list = NULL;
+	}
+      else if (c == (struct cmd_list_element *) -1)
+	{
+	  char *q;
+
+	  /* lookup_cmd_1 advances p up to the first ambiguous thing, but
+	     doesn't advance over that thing itself.  Do so now.  */
+	  q = p;
+	  while (*q && (isalnum (*q) || *q == '-' || *q == '_'))
+	    ++q;
+	  if (q != tmp_command + point)
+	    {
+	      /* There is something beyond the ambiguous
+		 command, so there are no possible completions.  For
+		 example, "info t " or "info t foo" does not complete
+		 to anything, because "info t" can be "info target" or
+		 "info terminal".  */
+	      list = NULL;
+	    }
+	  else
+	    {
+	      /* We're trying to complete on the command which was ambiguous.
+		 This we can deal with.  */
+	      if (result_list)
+		{
+		  list = complete_on_cmdlist (*result_list->prefixlist, p,
+					      word);
+		}
+	      else
+		{
+		  list = complete_on_cmdlist (cmdlist, p, word);
+		}
+	      /* Insure that readline does the right thing with respect to
+		 inserting quotes.  */
+	      rl_completer_word_break_characters =
+		gdb_completer_command_word_break_characters;
+	    }
+	}
+      else
+	{
+	  /* We've recognized a full command.  */
+
+	  if (p == tmp_command + point)
+	    {
+	      /* There is no non-whitespace in the line beyond the command.  */
+
+	      if (p[-1] == ' ' || p[-1] == '\t')
+		{
+		  /* The command is followed by whitespace; we need to complete
+		     on whatever comes after command.  */
+		  if (c->prefixlist)
+		    {
+		      /* It is a prefix command; what comes after it is
+			 a subcommand (e.g. "info ").  */
+		      list = complete_on_cmdlist (*c->prefixlist, p, word);
+
+		      /* Insure that readline does the right thing
+			 with respect to inserting quotes.  */
+		      rl_completer_word_break_characters =
+			gdb_completer_command_word_break_characters;
+		    }
+		  else if (c->enums)
+		    {
+		      list = complete_on_enum (c->enums, p, word);
+		      rl_completer_word_break_characters =
+			gdb_completer_command_word_break_characters;
+		    }
+		  else
+		    {
+		      /* It is a normal command; what comes after it is
+			 completed by the command's completer function.  */
+		      list = (*c->completer) (p, word);
+		    }
+		}
+	      else
+		{
+		  /* The command is not followed by whitespace; we need to
+		     complete on the command itself.  e.g. "p" which is a
+		     command itself but also can complete to "print", "ptype"
+		     etc.  */
+		  char *q;
+
+		  /* Find the command we are completing on.  */
+		  q = p;
+		  while (q > tmp_command)
+		    {
+		      if (isalnum (q[-1]) || q[-1] == '-' || q[-1] == '_')
+			--q;
+		      else
+			break;
+		    }
+
+		  list = complete_on_cmdlist (result_list, q, word);
+
+		  /* Insure that readline does the right thing
+		     with respect to inserting quotes.  */
+		  rl_completer_word_break_characters =
+		    gdb_completer_command_word_break_characters;
+		}
+	    }
+	  else
+	    {
+	      /* There is non-whitespace beyond the command.  */
+
+	      if (c->prefixlist && !c->allow_unknown)
+		{
+		  /* It is an unrecognized subcommand of a prefix command,
+		     e.g. "info adsfkdj".  */
+		  list = NULL;
+		}
+	      else if (c->enums)
+		{
+		  list = complete_on_enum (c->enums, p, word);
+		}
+	      else
+		{
+		  /* It is a normal command.  */
+		  list = (*c->completer) (p, word);
+		}
+	    }
+	}
+    }
+
+  /* If we found a list of potential completions during initialization then
+     dole them out one at a time.  The vector of completions is NULL
+     terminated, so after returning the last one, return NULL (and continue
+     to do so) each time we are called after that, until a new list is
+     available. */
+
+  if (list)
+    {
+      output = list[index];
+      if (output)
+	{
+	  index++;
+	}
+    }
+
+#if 0
+  /* Can't do this because readline hasn't yet checked the word breaks
+     for figuring out whether to insert a quote.  */
+  if (output == NULL)
+    /* Make sure the word break characters are set back to normal for the
+       next time that readline tries to complete something.  */
+    rl_completer_word_break_characters =
+      gdb_completer_word_break_characters;
+#endif
+
+  return (output);
+}
+
+/* Line completion interface function for readline.  */
+
+static char *
+readline_line_completion_function (text, matches)
+     char *text;
+     int matches;
+{
+  return line_completion_function (text, matches, rl_line_buffer, rl_point);
+}
+
+/* Skip over a possibly quoted word (as defined by the quote characters
+   and word break characters the completer uses).  Returns pointer to the
+   location after the "word". */
+
+char *
+skip_quoted (str)
+     char *str;
+{
+  char quote_char = '\0';
+  char *scan;
+
+  for (scan = str; *scan != '\0'; scan++)
+    {
+      if (quote_char != '\0')
+	{
+	  /* Ignore everything until the matching close quote char */
+	  if (*scan == quote_char)
+	    {
+	      /* Found matching close quote. */
+	      scan++;
+	      break;
+	    }
+	}
+      else if (strchr (gdb_completer_quote_characters, *scan))
+	{
+	  /* Found start of a quoted string. */
+	  quote_char = *scan;
+	}
+      else if (strchr (gdb_completer_word_break_characters, *scan))
+	{
+	  break;
+	}
+    }
+  return (scan);
+}
+
+
+#ifdef STOP_SIGNAL
+static void
+stop_sig (signo)
+int signo;
+{
+#if STOP_SIGNAL == SIGTSTP
+  signal (SIGTSTP, SIG_DFL);
+  sigsetmask (0);
+  kill (getpid (), SIGTSTP);
+  signal (SIGTSTP, stop_sig);
+#else
+  signal (STOP_SIGNAL, stop_sig);
+#endif
+  printf_unfiltered ("%s", get_prompt ());
+  gdb_flush (gdb_stdout);
+
+  /* Forget about any previous command -- null line now will do nothing.  */
+  dont_repeat ();
+}
+#endif /* STOP_SIGNAL */
+
+/* Initialize signal handlers. */
+static void
+do_nothing (signo)
+int signo;
+{
+  /* Under System V the default disposition of a signal is reinstated after
+     the signal is caught and delivered to an application process.  On such
+     systems one must restore the replacement signal handler if one wishes
+     to continue handling the signal in one's program.  On BSD systems this
+     is not needed but it is harmless, and it simplifies the code to just do
+     it unconditionally. */
+  signal (signo, do_nothing);
+}
+
+static void
+init_signals ()
+{
+  signal (SIGINT, request_quit);
+
+  /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
+     to the inferior and breakpoints will be ignored.  */
+#ifdef SIGTRAP
+  signal (SIGTRAP, SIG_DFL);
+#endif
+
+  /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
+     passed to the inferior, which we don't want.  It would be
+     possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
+     on BSD4.3 systems using vfork, that can affect the
+     GDB process as well as the inferior (the signal handling tables
+     might be in memory, shared between the two).  Since we establish
+     a handler for SIGQUIT, when we call exec it will set the signal
+     to SIG_DFL for us.  */
+  signal (SIGQUIT, do_nothing);
+#ifdef SIGHUP
+  if (signal (SIGHUP, do_nothing) != SIG_IGN)
+    signal (SIGHUP, disconnect);
+#endif
+  signal (SIGFPE, float_handler);
+
+#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
+  signal (SIGWINCH, SIGWINCH_HANDLER);
+#endif
+}
+
+/* Read one line from the command input stream `instream'
+   into the local static buffer `linebuffer' (whose current length
+   is `linelength').
+   The buffer is made bigger as necessary.
+   Returns the address of the start of the line.
+
+   NULL is returned for end of file.
+
+   *If* the instream == stdin & stdin is a terminal, the line read
+   is copied into the file line saver (global var char *line,
+   length linesize) so that it can be duplicated.
+
+   This routine either uses fancy command line editing or
+   simple input as the user has requested.  */
+
+char *
+command_line_input (prompt_arg, repeat, annotation_suffix)
+     char *prompt_arg;
+     int repeat;
+     char *annotation_suffix;
+{
+  static char *linebuffer = 0;
+  static unsigned linelength = 0;
+  register char *p;
+  char *p1;
+  char *rl;
+  char *local_prompt = prompt_arg;
+  char *nline;
+  char got_eof = 0;
+
+  /* The annotation suffix must be non-NULL.  */
+  if (annotation_suffix == NULL)
+    annotation_suffix = "";
+
+  if (annotation_level > 1 && instream == stdin)
+    {
+      local_prompt = alloca ((prompt_arg == NULL ? 0 : strlen (prompt_arg))
+			     + strlen (annotation_suffix) + 40);
+      if (prompt_arg == NULL)
+	local_prompt[0] = '\0';
+      else
+	strcpy (local_prompt, prompt_arg);
+      strcat (local_prompt, "\n\032\032");
+      strcat (local_prompt, annotation_suffix);
+      strcat (local_prompt, "\n");
+    }
+
+  if (linebuffer == 0)
+    {
+      linelength = 80;
+      linebuffer = (char *) xmalloc (linelength);
+    }
+
+  p = linebuffer;
+
+  /* Control-C quits instantly if typed while in this loop
+     since it should not wait until the user types a newline.  */
+  immediate_quit++;
+#ifdef STOP_SIGNAL
+  if (job_control)
+    {
+      if (async_p)
+	signal (STOP_SIGNAL, handle_stop_sig);
+      else
+	signal (STOP_SIGNAL, stop_sig);
+    }
+#endif
+
+  while (1)
+    {
+      /* Make sure that all output has been output.  Some machines may let
+	 you get away with leaving out some of the gdb_flush, but not all.  */
+      wrap_here ("");
+      gdb_flush (gdb_stdout);
+      gdb_flush (gdb_stderr);
+
+      if (source_file_name != NULL)
+	{
+	  ++source_line_number;
+	  sprintf (source_error,
+		   "%s%s:%d: Error in sourced command file:\n",
+		   source_pre_error,
+		   source_file_name,
+		   source_line_number);
+	  error_pre_print = source_error;
+	}
+
+      if (annotation_level > 1 && instream == stdin)
+	{
+	  printf_unfiltered ("\n\032\032pre-");
+	  printf_unfiltered (annotation_suffix);
+	  printf_unfiltered ("\n");
+	}
+
+      /* Don't use fancy stuff if not talking to stdin.  */
+      if (readline_hook && instream == NULL)
+	{
+	  rl = (*readline_hook) (local_prompt);
+	}
+      else if (command_editing_p && instream == stdin && ISATTY (instream))
+	{
+	  rl = readline (local_prompt);
+	}
+      else
+	{
+	  rl = gdb_readline (local_prompt);
+	}
+
+      if (annotation_level > 1 && instream == stdin)
+	{
+	  printf_unfiltered ("\n\032\032post-");
+	  printf_unfiltered (annotation_suffix);
+	  printf_unfiltered ("\n");
+	}
+
+      if (!rl || rl == (char *) EOF)
+	{
+	  got_eof = 1;
+	  break;
+	}
+      if (strlen(rl) + 1 + (p - linebuffer) > linelength)
+	{
+	  linelength = strlen(rl) + 1 + (p - linebuffer);
+	  nline = (char *) xrealloc (linebuffer, linelength);
+	  p += nline - linebuffer;
+	  linebuffer = nline;
+	}
+      p1 = rl;
+      /* Copy line.  Don't copy null at end.  (Leaves line alone
+         if this was just a newline)  */
+      while (*p1)
+	*p++ = *p1++;
+
+      free (rl);			/* Allocated in readline.  */
+
+      if (p == linebuffer || *(p - 1) != '\\')
+	break;
+
+      p--;			/* Put on top of '\'.  */
+      local_prompt = (char *) 0;
+  }
+
+#ifdef STOP_SIGNAL
+  if (job_control)
+    signal (STOP_SIGNAL, SIG_DFL);
+#endif
+  immediate_quit--;
+
+  if (got_eof)
+    return NULL;
+
+#define SERVER_COMMAND_LENGTH 7
+  server_command =
+    (p - linebuffer > SERVER_COMMAND_LENGTH)
+      && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH);
+  if (server_command)
+    {
+      /* Note that we don't set `line'.  Between this and the check in
+	 dont_repeat, this insures that repeating will still do the
+	 right thing.  */
+      *p = '\0';
+      return linebuffer + SERVER_COMMAND_LENGTH;
+    }
+
+  /* Do history expansion if that is wished.  */
+  if (history_expansion_p && instream == stdin
+      && ISATTY (instream))
+    {
+      char *history_value;
+      int expanded;
+
+      *p = '\0';		/* Insert null now.  */
+      expanded = history_expand (linebuffer, &history_value);
+      if (expanded)
+	{
+	  /* Print the changes.  */
+	  printf_unfiltered ("%s\n", history_value);
+
+	  /* If there was an error, call this function again.  */
+	  if (expanded < 0)
+	    {
+	      free (history_value);
+	      return command_line_input (prompt_arg, repeat, annotation_suffix);
+	    }
+	  if (strlen (history_value) > linelength)
+	    {
+	      linelength = strlen (history_value) + 1;
+	      linebuffer = (char *) xrealloc (linebuffer, linelength);
+	    }
+	  strcpy (linebuffer, history_value);
+	  p = linebuffer + strlen(linebuffer);
+	  free (history_value);
+	}
+    }
+
+  /* If we just got an empty line, and that is supposed
+     to repeat the previous command, return the value in the
+     global buffer.  */
+  if (repeat && p == linebuffer)
+    return line;
+  for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++) ;
+  if (repeat && !*p1)
+    return line;
+
+  *p = 0;
+
+  /* Add line to history if appropriate.  */
+  if (instream == stdin
+      && ISATTY (stdin) && *linebuffer)
+    add_history (linebuffer);
+
+  /* Note: lines consisting solely of comments are added to the command
+     history.  This is useful when you type a command, and then
+     realize you don't want to execute it quite yet.  You can comment
+     out the command and then later fetch it from the value history
+     and remove the '#'.  The kill ring is probably better, but some
+     people are in the habit of commenting things out.  */
+  if (*p1 == '#')
+    *p1 = '\0';  /* Found a comment. */
+
+  /* Save into global buffer if appropriate.  */
+  if (repeat)
+    {
+      if (linelength > linesize)
+	{
+	  line = xrealloc (line, linelength);
+	  linesize = linelength;
+	}
+      strcpy (line, linebuffer);
+      return line;
+    }
+
+  return linebuffer;
+}
+
+
+/* Expand the body_list of COMMAND so that it can hold NEW_LENGTH
+   code bodies.  This is typically used when we encounter an "else"
+   clause for an "if" command.  */
+
+static void
+realloc_body_list (command, new_length)
+     struct command_line *command;
+     int new_length;
+{
+  int n;
+  struct command_line **body_list;
+
+  n = command->body_count;
+
+  /* Nothing to do?  */
+  if (new_length <= n)
+    return;
+
+  body_list = (struct command_line **)
+    xmalloc (sizeof (struct command_line *) * new_length);
+
+  memcpy (body_list, command->body_list, sizeof (struct command_line *) * n);
+
+  free (command->body_list);
+  command->body_list = body_list;
+  command->body_count = new_length;
+}
+
+/* Read one line from the input stream.  If the command is an "else" or
+   "end", return such an indication to the caller.  */
+
+static enum misc_command_type
+read_next_line (command)
+     struct command_line **command;
+{
+  char *p, *p1, *prompt_ptr, control_prompt[256];
+  int i = 0;
+
+  if (control_level >= 254)
+    error ("Control nesting too deep!\n");
+
+  /* Set a prompt based on the nesting of the control commands.  */
+  if (instream == stdin || (instream == 0 && readline_hook != NULL))
+    {
+      for (i = 0; i < control_level; i++)
+	control_prompt[i] = ' ';
+      control_prompt[i] = '>';
+      control_prompt[i+1] = '\0';
+      prompt_ptr = (char *)&control_prompt[0];
+    }
+  else
+    prompt_ptr = NULL;
+
+  p = command_line_input (prompt_ptr, instream == stdin, "commands");
+
+  /* Not sure what to do here.  */
+  if (p == NULL)
+    return end_command;
+
+  /* Strip leading and trailing whitespace.  */
+  while (*p == ' ' || *p == '\t')
+    p++;
+
+  p1 = p + strlen (p);
+  while (p1 != p && (p1[-1] == ' ' || p1[-1] == '\t'))
+    p1--;
+
+  /* Blanks and comments don't really do anything, but we need to
+     distinguish them from else, end and other commands which can be
+     executed.  */
+  if (p1 == p || p[0] == '#')
+    return nop_command;
+      
+  /* Is this the end of a simple, while, or if control structure?  */
+  if (p1 - p == 3 && !strncmp (p, "end", 3))
+    return end_command;
+
+  /* Is the else clause of an if control structure?  */
+  if (p1 - p == 4 && !strncmp (p, "else", 4))
+    return else_command;
+
+  /* Check for while, if, break, continue, etc and build a new command
+     line structure for them.  */
+  if (p1 - p > 5 && !strncmp (p, "while", 5))
+    *command = build_command_line (while_control, p + 6);
+  else if (p1 - p > 2 && !strncmp (p, "if", 2))
+    *command = build_command_line (if_control, p + 3);
+  else if (p1 - p == 10 && !strncmp (p, "loop_break", 10))
+    {
+      *command = (struct command_line *)
+	xmalloc (sizeof (struct command_line));
+      (*command)->next = NULL;
+      (*command)->line = NULL;
+      (*command)->control_type = break_control;
+      (*command)->body_count = 0;
+      (*command)->body_list = NULL;
+    }
+  else if (p1 - p == 13 && !strncmp (p, "loop_continue", 13))
+    {
+      *command = (struct command_line *)
+	xmalloc (sizeof (struct command_line));
+      (*command)->next = NULL;
+      (*command)->line = NULL;
+      (*command)->control_type = continue_control;
+      (*command)->body_count = 0;
+      (*command)->body_list = NULL;
+    }
+  else
+    {
+      /* A normal command.  */
+      *command = (struct command_line *)
+	xmalloc (sizeof (struct command_line));
+      (*command)->next = NULL;
+      (*command)->line = savestring (p, p1 - p);
+      (*command)->control_type = simple_control;
+      (*command)->body_count = 0;
+      (*command)->body_list = NULL;
+  }
+
+  /* Nothing special.  */
+  return ok_command;
+}
+
+/* Recursively read in the control structures and create a command_line 
+   structure from them.
+
+   The parent_control parameter is the control structure in which the
+   following commands are nested.  */
+
+static enum command_control_type
+recurse_read_control_structure (current_cmd)
+     struct command_line *current_cmd;
+{
+  int current_body, i;
+  enum misc_command_type val;
+  enum command_control_type ret;
+  struct command_line **body_ptr, *child_tail, *next;
+
+  child_tail = NULL;
+  current_body = 1;
+
+  /* Sanity checks.  */
+  if (current_cmd->control_type == simple_control)
+    {
+      error ("Recursed on a simple control type\n");
+      return invalid_control;
+    }
+
+  if (current_body > current_cmd->body_count)
+    {
+      error ("Allocated body is smaller than this command type needs\n");
+      return invalid_control;
+    }
+
+  /* Read lines from the input stream and build control structures.  */
+  while (1)
+    {
+      dont_repeat ();
+
+      next = NULL;
+      val = read_next_line (&next);
+
+      /* Just skip blanks and comments.  */
+      if (val == nop_command)
+	continue;
+
+      if (val == end_command)
+	{
+	  if (current_cmd->control_type == while_control
+	      || current_cmd->control_type == if_control)
+	    {
+	      /* Success reading an entire control structure.  */
+	      ret = simple_control;
+	      break;
+	    }
+	  else
+	    {
+	      ret = invalid_control;
+	      break;
+	    }
+	}
+      
+      /* Not the end of a control structure.  */
+      if (val == else_command)
+	{
+	  if (current_cmd->control_type == if_control
+	      && current_body == 1)
+	    {
+	      realloc_body_list (current_cmd, 2);
+	      current_body = 2;
+	      child_tail = NULL;
+	      continue;
+	    }
+	  else
+	    {
+	      ret = invalid_control;
+	      break;
+	    }
+	}
+
+      if (child_tail)
+	{
+	  child_tail->next = next;
+	}
+      else
+	{
+	  body_ptr = current_cmd->body_list;
+	  for (i = 1; i < current_body; i++)
+	    body_ptr++;
+
+	  *body_ptr = next;
+
+	}
+
+      child_tail = next;
+
+      /* If the latest line is another control structure, then recurse
+	 on it.  */
+      if (next->control_type == while_control
+	  || next->control_type == if_control)
+	{
+	  control_level++;
+	  ret = recurse_read_control_structure (next);
+	  control_level--;
+
+	  if (ret != simple_control)
+	    break;
+	}
+    }
+
+  dont_repeat ();
+
+  return ret;
+}
+
+/* Read lines from the input stream and accumulate them in a chain of
+   struct command_line's, which is then returned.  For input from a
+   terminal, the special command "end" is used to mark the end of the
+   input, and is not included in the returned chain of commands. */
+
+#define END_MESSAGE "End with a line saying just \"end\"."
+
+struct command_line *
+read_command_lines (prompt_arg, from_tty)
+     char *prompt_arg;
+     int from_tty;
+{
+  struct command_line *head, *tail, *next;
+  struct cleanup *old_chain;
+  enum command_control_type ret;
+  enum misc_command_type val;
+
+  control_level = 0; 
+  if (readline_begin_hook)
+    {
+      /* Note - intentional to merge messages with no newline */
+      (*readline_begin_hook) ("%s  %s\n", prompt_arg, END_MESSAGE);
+    }
+  else if (from_tty && input_from_terminal_p ())
+    {
+      printf_unfiltered ("%s\n%s\n", prompt_arg, END_MESSAGE);
+      gdb_flush (gdb_stdout);
+    }
+
+  head = tail = NULL;
+  old_chain = NULL;
+
+  while (1)
+    {
+      val = read_next_line (&next);
+
+      /* Ignore blank lines or comments.  */
+      if (val == nop_command)
+	continue;
+
+      if (val == end_command)
+	{
+	  ret = simple_control;
+	  break;
+	}
+
+      if (val != ok_command)
+	{
+	  ret = invalid_control;
+	  break;
+	}
+
+      if (next->control_type == while_control
+	  || next->control_type == if_control)
+	{
+	  control_level++;
+	  ret = recurse_read_control_structure (next);
+	  control_level--;
+
+	  if (ret == invalid_control)
+	    break;
+	}
+      
+      if (tail)
+	{
+	  tail->next = next;
+	}
+      else
+	{
+	  head = next;
+	  old_chain = make_cleanup ((make_cleanup_func) free_command_lines, 
+                                    &head);
+	}
+      tail = next;
+    }
+
+  dont_repeat ();
+
+  if (head)
+    {
+      if (ret != invalid_control)
+	{
+	  discard_cleanups (old_chain);
+	}
+      else
+	do_cleanups (old_chain);
+    }
+
+  if (readline_end_hook)
+    {
+      (*readline_end_hook) ();
+    }
+  return (head);
+}
+
+/* Free a chain of struct command_line's.  */
+
+void
+free_command_lines (lptr)
+      struct command_line **lptr;
+{
+  register struct command_line *l = *lptr;
+  register struct command_line *next;
+  struct command_line **blist;
+  int i;
+
+  while (l)
+    {
+      if (l->body_count > 0)
+	{
+	  blist = l->body_list;
+	  for (i = 0; i < l->body_count; i++, blist++)
+	    free_command_lines (blist);
+	}
+      next = l->next;
+      free (l->line);
+      free ((PTR)l);
+      l = next;
+    }
+}
+
+/* Add an element to the list of info subcommands.  */
+
+void
+add_info (name, fun, doc)
+     char *name;
+     void (*fun) PARAMS ((char *, int));
+     char *doc;
+{
+  add_cmd (name, no_class, fun, doc, &infolist);
+}
+
+/* Add an alias to the list of info subcommands.  */
+
+void
+add_info_alias (name, oldname, abbrev_flag)
+     char *name;
+     char *oldname;
+     int abbrev_flag;
+{
+  add_alias_cmd (name, oldname, 0, abbrev_flag, &infolist);
+}
+
+/* The "info" command is defined as a prefix, with allow_unknown = 0.
+   Therefore, its own definition is called only for "info" with no args.  */
+
+/* ARGSUSED */
+static void
+info_command (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  printf_unfiltered ("\"info\" must be followed by the name of an info command.\n");
+  help_list (infolist, "info ", -1, gdb_stdout);
+}
+
+/* The "complete" command is used by Emacs to implement completion.  */
+
+/* ARGSUSED */
+static void
+complete_command (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  int i;
+  int argpoint;
+  char *completion;
+
+  dont_repeat ();
+
+  if (arg == NULL)
+    arg = "";
+  argpoint = strlen (arg);
+
+  for (completion = line_completion_function (arg, i = 0, arg, argpoint);
+       completion;
+       completion = line_completion_function (arg, ++i, arg, argpoint))
+    {
+      printf_unfiltered ("%s\n", completion);
+      free (completion);
+    }
+}
+
+/* The "show" command with no arguments shows all the settings.  */
+
+/* ARGSUSED */
+static void
+show_command (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  cmd_show_list (showlist, from_tty, "");
+}
+
+/* Add an element to the list of commands.  */
+
+void
+add_com (name, class, fun, doc)
+     char *name;
+     enum command_class class;
+     void (*fun) PARAMS ((char *, int));
+     char *doc;
+{
+  add_cmd (name, class, fun, doc, &cmdlist);
+}
+
+/* Add an alias or abbreviation command to the list of commands.  */
+
+void
+add_com_alias (name, oldname, class, abbrev_flag)
+     char *name;
+     char *oldname;
+     enum command_class class;
+     int abbrev_flag;
+{
+  add_alias_cmd (name, oldname, class, abbrev_flag, &cmdlist);
+}
+
+void
+error_no_arg (why)
+     char *why;
+{
+  error ("Argument required (%s).", why);
+}
+
+/* ARGSUSED */
+static void
+help_command (command, from_tty)
+     char *command;
+     int from_tty; /* Ignored */
+{
+  help_cmd (command, gdb_stdout);
+}
+
+static void
+validate_comname (comname)
+     char *comname;
+{
+  register char *p;
+
+  if (comname == 0)
+    error_no_arg ("name of command to define");
+
+  p = comname;
+  while (*p)
+    {
+      if (!isalnum(*p) && *p != '-' && *p != '_')
+	error ("Junk in argument list: \"%s\"", p);
+      p++;
+    }
+}
+
+/* This is just a placeholder in the command data structures.  */
+static void
+user_defined_command (ignore, from_tty)
+     char *ignore;
+     int from_tty;
+{
+}
+
+static void
+define_command (comname, from_tty)
+     char *comname;
+     int from_tty;
+{
+  register struct command_line *cmds;
+  register struct cmd_list_element *c, *newc, *hookc = 0;
+  char *tem = comname;
+  char tmpbuf[128];
+#define	HOOK_STRING	"hook-"
+#define	HOOK_LEN 5
+
+  validate_comname (comname);
+
+  /* Look it up, and verify that we got an exact match.  */
+  c = lookup_cmd (&tem, cmdlist, "", -1, 1);
+  if (c && !STREQ (comname, c->name))
+    c = 0;
+
+  if (c)
+    {
+      if (c->class == class_user || c->class == class_alias)
+	tem = "Redefine command \"%s\"? ";
+      else
+	tem = "Really redefine built-in command \"%s\"? ";
+      if (!query (tem, c->name))
+	error ("Command \"%s\" not redefined.", c->name);
+    }
+
+  /* If this new command is a hook, then mark the command which it
+     is hooking.  Note that we allow hooking `help' commands, so that
+     we can hook the `stop' pseudo-command.  */
+
+  if (!strncmp (comname, HOOK_STRING, HOOK_LEN))
+    {
+      /* Look up cmd it hooks, and verify that we got an exact match.  */
+      tem = comname+HOOK_LEN;
+      hookc = lookup_cmd (&tem, cmdlist, "", -1, 0);
+      if (hookc && !STREQ (comname+HOOK_LEN, hookc->name))
+	hookc = 0;
+      if (!hookc)
+	{
+	  warning ("Your new `%s' command does not hook any existing command.",
+		   comname);
+	  if (!query ("Proceed? "))
+	    error ("Not confirmed.");
+	}
+    }
+
+  comname = savestring (comname, strlen (comname));
+
+  /* If the rest of the commands will be case insensitive, this one
+     should behave in the same manner. */
+  for (tem = comname; *tem; tem++)
+    if (isupper(*tem)) *tem = tolower(*tem);
+
+  sprintf (tmpbuf, "Type commands for definition of \"%s\".", comname);
+  cmds = read_command_lines (tmpbuf, from_tty);
+
+  if (c && c->class == class_user)
+    free_command_lines (&c->user_commands);
+
+  newc = add_cmd (comname, class_user, user_defined_command,
+	   (c && c->class == class_user)
+	   ? c->doc : savestring ("User-defined.", 13), &cmdlist);
+  newc->user_commands = cmds;
+
+  /* If this new command is a hook, then mark both commands as being
+     tied.  */
+  if (hookc)
+    {
+      hookc->hook = newc;	/* Target gets hooked.  */
+      newc->hookee = hookc;	/* We are marked as hooking target cmd.  */
+    }
+}
+
+static void
+document_command (comname, from_tty)
+     char *comname;
+     int from_tty;
+{
+  struct command_line *doclines;
+  register struct cmd_list_element *c;
+  char *tem = comname;
+  char tmpbuf[128];
+
+  validate_comname (comname);
+
+  c = lookup_cmd (&tem, cmdlist, "", 0, 1);
+
+  if (c->class != class_user)
+    error ("Command \"%s\" is built-in.", comname);
+
+  sprintf (tmpbuf, "Type documentation for \"%s\".", comname);
+  doclines = read_command_lines (tmpbuf, from_tty);
+
+  if (c->doc) free (c->doc);
+
+  {
+    register struct command_line *cl1;
+    register int len = 0;
+
+    for (cl1 = doclines; cl1; cl1 = cl1->next)
+      len += strlen (cl1->line) + 1;
+
+    c->doc = (char *) xmalloc (len + 1);
+    *c->doc = 0;
+
+    for (cl1 = doclines; cl1; cl1 = cl1->next)
+      {
+	strcat (c->doc, cl1->line);
+	if (cl1->next)
+	  strcat (c->doc, "\n");
+      }
+  }
+
+  free_command_lines (&doclines);
+}
+
+/* Print the GDB banner. */
+void
+print_gdb_version (stream)
+  GDB_FILE *stream;
+{
+  /* From GNU coding standards, first line is meant to be easy for a
+     program to parse, and is just canonical program name and version
+     number, which starts after last space. */
+
+  fprintf_filtered (stream, "GNU gdb %s\n", version);
+
+  /* Second line is a copyright notice. */
+
+  fprintf_filtered (stream, "Copyright 1998 Free Software Foundation, Inc.\n");
+
+  /* Following the copyright is a brief statement that the program is
+     free software, that users are free to copy and change it on
+     certain conditions, that it is covered by the GNU GPL, and that
+     there is no warranty. */
+
+  fprintf_filtered (stream, "\
+GDB is free software, covered by the GNU General Public License, and you are\n\
+welcome to change it and/or distribute copies of it under certain conditions.\n\
+Type \"show copying\" to see the conditions.\n\
+There is absolutely no warranty for GDB.  Type \"show warranty\" for details.\n");
+
+  /* After the required info we print the configuration information. */
+
+  fprintf_filtered (stream, "This GDB was configured as \"");
+  if (!STREQ (host_name, target_name))
+    {
+      fprintf_filtered (stream, "--host=%s --target=%s", host_name, target_name);
+    }
+  else
+    {
+      fprintf_filtered (stream, "%s", host_name);
+    }
+  fprintf_filtered (stream, "\".");
+}
+
+/* ARGSUSED */
+static void
+show_version (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  immediate_quit++;
+  print_gdb_version (gdb_stdout);
+  printf_filtered ("\n");
+  immediate_quit--;
+}
+
+/* get_prompt: access method for the GDB prompt string.  */
+
+#define MAX_PROMPT_SIZE 256
+
+/*
+ * int get_prompt_1 (char * buf);
+ *
+ * Work-horse for get_prompt (called via catch_errors).
+ * Argument is buffer to hold the formatted prompt.
+ *
+ * Returns: 1 for success (use formatted prompt)
+ *          0 for failure (use gdb_prompt_string).
+ */ 
+
+static int gdb_prompt_escape;
+
+static int
+get_prompt_1 (formatted_prompt)
+     char *formatted_prompt;
+{
+  char *local_prompt;
+
+  if (async_p)
+    local_prompt = PROMPT (0);
+  else
+    local_prompt = gdb_prompt_string;
+
+
+  if (gdb_prompt_escape == 0)
+    {
+      return 0;		/* do no formatting */
+    }
+  else /* formatted prompt */
+    {
+      char   fmt[40], *promptp, *outp, *tmp;
+      value_ptr arg_val;
+      DOUBLEST  doubleval;
+      LONGEST   longval;
+      CORE_ADDR addrval;
+
+      int i, len;
+      struct type *arg_type, *elt_type;
+
+      promptp = local_prompt;
+      outp    = formatted_prompt;
+
+      while (*promptp != '\0')
+	{
+	  int available = MAX_PROMPT_SIZE - (outp - formatted_prompt) - 1;
+
+	  if (*promptp != gdb_prompt_escape)
+	    {
+	      if (available >= 1)			/* overflow protect */
+		*outp++ = *promptp++;
+	    }
+	  else
+	    {
+	      /* GDB prompt string contains escape char.  Parse for arg.
+		 Two consecutive escape chars followed by arg followed by
+		 a comma means to insert the arg using a default format.
+		 Otherwise a printf format string may be included between
+		 the two escape chars.  eg:
+		   %%foo,	insert foo using default format
+		   %2.2f%foo,	insert foo using "%2.2f" format
+		 A mismatch between the format string and the data type
+		 of "foo" is an error (which we don't know how to protect
+		 against).  */
+
+	      fmt[0] = '\0';	/* assume null format string */
+	      if (promptp[1] == gdb_prompt_escape)	/* double esc char */
+		{
+		  promptp += 2;	/* skip past two escape chars. */
+		}
+	      else
+		{
+		  /* extract format string from between two esc chars */
+		  i = 0;
+		  do {
+		    fmt[i++] = *promptp++;	/* copy format string */
+		  } while (i < sizeof (fmt) - 1 && 
+			   *promptp != gdb_prompt_escape &&
+			   *promptp != '\0');
+
+		  if (*promptp != gdb_prompt_escape)
+		    error ("Syntax error at prompt position %d",
+			   promptp - local_prompt);
+		  else
+		    {
+		      promptp++;	/* skip second escape char */
+		      fmt[i++] = '\0';	/* terminate the format string */
+		    }
+		}
+
+	      arg_val = parse_to_comma_and_eval (&promptp);
+	      if (*promptp == ',')
+		promptp++;		/* skip past the comma */
+	      arg_type = check_typedef (VALUE_TYPE (arg_val));
+	      switch (TYPE_CODE (arg_type)) 
+		{
+		case TYPE_CODE_ARRAY:
+		  elt_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+		  if (TYPE_LENGTH (arg_type) > 0  &&
+		      TYPE_LENGTH (elt_type) == 1 &&
+		      TYPE_CODE (elt_type) == TYPE_CODE_INT)
+		    {
+		      int len = TYPE_LENGTH (arg_type);
+
+		      if (VALUE_LAZY (arg_val))
+			value_fetch_lazy (arg_val);
+		      tmp = VALUE_CONTENTS (arg_val);
+
+		      if (len > available)
+			len = available;		/* overflow protect */
+
+		      /* FIXME: how to protect GDB from crashing
+			 from bad user-supplied format string? */
+		      if (fmt[0] != 0)
+			sprintf (outp, fmt, tmp);
+		      else
+			strncpy (outp, tmp, len);
+		      outp[len] = '\0';
+		    }
+		  break;
+		case TYPE_CODE_PTR:
+		  elt_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+		  addrval = value_as_pointer (arg_val);
+
+		  if (TYPE_LENGTH (elt_type) == 1 &&
+		      TYPE_CODE   (elt_type) == TYPE_CODE_INT &&
+		      addrval != 0)
+		    {
+		      /* display it as a string */
+		      char *default_fmt = "%s";
+		      char *tmp;
+		      int err = 0;
+
+		      /* Limiting the number of bytes that the following call
+			 will read protects us from sprintf overflow later. */
+		      i = target_read_string (addrval,		     /* src */
+					      &tmp, 		     /* dest */
+					      available, 	     /* len */
+					      &err);
+		      if (err)	/* read failed */
+			error ("%s on target_read", safe_strerror (err));
+
+		      tmp[i] = '\0';	/* force-terminate string */
+		      /* FIXME: how to protect GDB from crashing
+			 from bad user-supplied format string? */
+		      sprintf (outp, fmt[0] == 0 ? default_fmt : fmt, 
+			       tmp);
+		      free (tmp);
+		    }
+		  else
+		    {
+		      /* display it as a pointer */
+		      char *default_fmt = "0x%x";
+
+		      /* FIXME: how to protect GDB from crashing
+			 from bad user-supplied format string? */
+		      if (available >= 16 /*?*/)	/* overflow protect */
+			sprintf (outp, fmt[0] == 0 ? default_fmt : fmt,
+				 (long) addrval);
+		    }
+		  break;
+		case TYPE_CODE_FLT:
+		  {
+		    char *default_fmt = "%g";
+
+		    doubleval = value_as_double (arg_val);
+		    /* FIXME: how to protect GDB from crashing
+		       from bad user-supplied format string? */
+		    if (available >= 16 /*?*/)		/* overflow protect */
+		      sprintf (outp, fmt[0] == 0 ? default_fmt : fmt,
+			       (double) doubleval);
+		    break;
+		  }
+		case TYPE_CODE_INT:
+		  {
+		    char *default_fmt = "%d";
+
+		    longval = value_as_long (arg_val);
+		    /* FIXME: how to protect GDB from crashing
+		       from bad user-supplied format string? */
+		    if (available >= 16 /*?*/)		/* overflow protect */
+		      sprintf (outp, fmt[0] == 0 ? default_fmt : fmt,
+			       (long) longval);
+		    break;
+		  }
+		case TYPE_CODE_BOOL:
+		  {
+		    /* no default format for bool */
+		    longval = value_as_long (arg_val);
+		    if (available >= 8 /*?*/)		/* overflow protect */
+		      {
+			if (longval)
+			  strcpy (outp, "<true>");
+			else
+			  strcpy (outp, "<false>");
+		      }
+		    break;
+		  }
+		case TYPE_CODE_ENUM:
+		  {
+		    /* no default format for enum */
+		    longval = value_as_long (arg_val);
+		    len = TYPE_NFIELDS (arg_type);
+		    /* find enum name if possible */
+		    for (i = 0; i < len; i++)
+		      if (TYPE_FIELD_BITPOS (arg_type, i) == longval)
+			break;		/* match -- end loop */
+
+		    if (i < len)	/* enum name found */
+		      {
+			char *name = TYPE_FIELD_NAME (arg_type, i);
+
+			strncpy (outp, name, available);
+			/* in casel available < strlen (name), */
+			outp[available] = '\0';
+		      }
+		    else
+		      {
+			if (available >= 16 /*?*/)	/* overflow protect */
+			  sprintf (outp, "%d", (long) longval);
+		      }
+		    break;
+		  }
+		case TYPE_CODE_VOID:
+		  *outp = '\0';
+		  break;	/* void type -- no output */
+		default:
+		  error ("bad data type at prompt position %d",
+			 promptp - local_prompt);
+		  break;
+		}
+	      outp += strlen (outp);
+	    }
+	}
+      *outp++ = '\0';		/* terminate prompt string */
+      return 1;
+    }
+}
+
+char *
+get_prompt ()
+{
+  static char buf[MAX_PROMPT_SIZE];
+
+  if (catch_errors (get_prompt_1, buf, "bad formatted prompt: ", 
+		    RETURN_MASK_ALL))
+    {
+      return &buf[0];	/* successful formatted prompt */
+    }
+  else
+    {
+      /* Prompt could not be formatted.  */
+      if (async_p)
+	return PROMPT (0);
+      else
+	return gdb_prompt_string;
+    }
+}
+
+void
+set_prompt (s)
+     char *s;
+{
+/* ??rehrauer: I don't know why this fails, since it looks as though
+   assignments to prompt are wrapped in calls to savestring...
+  if (prompt != NULL)
+    free (prompt);
+*/
+  if (async_p)
+    PROMPT (0) = savestring (s, strlen (s));
+  else
+    gdb_prompt_string = savestring (s, strlen (s));
+}
+
+
+/* If necessary, make the user confirm that we should quit.  Return
+   non-zero if we should quit, zero if we shouldn't.  */
+
+int
+quit_confirm ()
+{
+  if (inferior_pid != 0 && target_has_execution)
+    {
+      char *s;
+
+      /* This is something of a hack.  But there's no reliable way to
+	 see if a GUI is running.  The `use_windows' variable doesn't
+	 cut it.  */
+      if (init_ui_hook)
+	s = "A debugging session is active.\nDo you still want to close the debugger?";
+      else if (attach_flag)
+	s = "The program is running.  Quit anyway (and detach it)? ";
+      else
+	s = "The program is running.  Exit anyway? ";
+
+      if (! query (s))
+	return 0;
+    }
+
+  return 1;
+}
+
+/* Quit without asking for confirmation.  */
+
+void
+quit_force (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  int exit_code = 0;
+
+  /* An optional expression may be used to cause gdb to terminate with the 
+     value of that expression. */
+  if (args)
+    {
+      value_ptr val = parse_and_eval (args);
+
+      exit_code = (int) value_as_long (val);
+    }
+
+  if (inferior_pid != 0 && target_has_execution)
+    {
+      if (attach_flag)
+	target_detach (args, from_tty);
+      else
+	target_kill ();
+    }
+
+  /* UDI wants this, to kill the TIP.  */
+  target_close (1);
+
+  /* Save the history information if it is appropriate to do so.  */
+  if (write_history_p && history_filename)
+    write_history (history_filename);
+
+  do_final_cleanups(ALL_CLEANUPS);	/* Do any final cleanups before exiting */
+
+#if defined(TUI)
+  /* tuiDo((TuiOpaqueFuncPtr)tuiCleanUp); */
+  /* The above does not need to be inside a tuiDo(), since
+   * it is not manipulating the curses screen, but rather,
+   * it is tearing it down.
+   */
+  if (tui_version)
+    tuiCleanUp();
+#endif
+
+  exit (exit_code);
+}
+
+/* Handle the quit command.  */
+
+void
+quit_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (! quit_confirm ())
+    error ("Not confirmed.");
+  quit_force (args, from_tty);
+}
+
+/* Returns whether GDB is running on a terminal and whether the user
+   desires that questions be asked of them on that terminal.  */
+
+int
+input_from_terminal_p ()
+{
+  return gdb_has_a_terminal () && (instream == stdin) & caution;
+}
+
+/* ARGSUSED */
+static void
+pwd_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (args) error ("The \"pwd\" command does not take an argument: %s", args);
+  getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
+
+  if (!STREQ (gdb_dirbuf, current_directory))
+    printf_unfiltered ("Working directory %s\n (canonically %s).\n",
+	    current_directory, gdb_dirbuf);
+  else
+    printf_unfiltered ("Working directory %s.\n", current_directory);
+}
+
+void
+cd_command (dir, from_tty)
+     char *dir;
+     int from_tty;
+{
+  int len;
+  /* Found something other than leading repetitions of "/..".  */
+  int found_real_path;
+  char *p;
+
+  /* If the new directory is absolute, repeat is a no-op; if relative,
+     repeat might be useful but is more likely to be a mistake.  */
+  dont_repeat ();
+
+  if (dir == 0)
+    error_no_arg ("new working directory");
+
+  dir = tilde_expand (dir);
+  make_cleanup (free, dir);
+
+  if (chdir (dir) < 0)
+    perror_with_name (dir);
+
+  len = strlen (dir);
+  dir = savestring (dir, len - (len > 1 && SLASH_P(dir[len-1])));
+  if (ROOTED_P(dir))
+    current_directory = dir;
+  else
+    {
+      if (SLASH_P (current_directory[0]) && current_directory[1] == '\0')
+	current_directory = concat (current_directory, dir, NULL);
+      else
+	current_directory = concat (current_directory, SLASH_STRING, dir, NULL);
+      free (dir);
+    }
+
+  /* Now simplify any occurrences of `.' and `..' in the pathname.  */
+
+  found_real_path = 0;
+  for (p = current_directory; *p;)
+    {
+      if (SLASH_P (p[0]) && p[1] == '.' && (p[2] == 0 || SLASH_P (p[2])))
+	strcpy (p, p + 2);
+      else if (SLASH_P (p[0]) && p[1] == '.' && p[2] == '.'
+	       && (p[3] == 0 || SLASH_P (p[3])))
+	{
+	  if (found_real_path)
+	    {
+	      /* Search backwards for the directory just before the "/.."
+		 and obliterate it and the "/..".  */
+	      char *q = p;
+	      while (q != current_directory && ! SLASH_P (q[-1]))
+		--q;
+
+	      if (q == current_directory)
+		/* current_directory is
+		   a relative pathname ("can't happen"--leave it alone).  */
+		++p;
+	      else
+		{
+		  strcpy (q - 1, p + 3);
+		  p = q - 1;
+		}
+	    }
+	  else
+	    /* We are dealing with leading repetitions of "/..", for example
+	       "/../..", which is the Mach super-root.  */
+	    p += 3;
+	}
+      else
+	{
+	  found_real_path = 1;
+	  ++p;
+	}
+    }
+
+  forget_cached_source_info ();
+
+  if (from_tty)
+    pwd_command ((char *) 0, 1);
+}
+
+struct source_cleanup_lines_args {
+  int old_line;
+  char *old_file;
+  char *old_pre_error;
+  char *old_error_pre_print;
+};
+
+static void
+source_cleanup_lines (args)
+     PTR args;
+{
+  struct source_cleanup_lines_args *p =
+    (struct source_cleanup_lines_args *)args;
+  source_line_number = p->old_line;
+  source_file_name = p->old_file;
+  source_pre_error = p->old_pre_error;
+  error_pre_print = p->old_error_pre_print;
+}
+
+/* ARGSUSED */
+void
+source_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  FILE *stream;
+  struct cleanup *old_cleanups;
+  char *file = args;
+  struct source_cleanup_lines_args old_lines;
+  int needed_length;
+
+  if (file == NULL)
+    {
+      error ("source command requires pathname of file to source.");
+    }
+
+  file = tilde_expand (file);
+  old_cleanups = make_cleanup (free, file);
+
+  stream = fopen (file, FOPEN_RT);
+  if (!stream)
+    {
+      if (from_tty)
+	perror_with_name (file);
+      else
+	return;
+    }
+
+  make_cleanup ((make_cleanup_func) fclose, stream);
+
+  old_lines.old_line = source_line_number;
+  old_lines.old_file = source_file_name;
+  old_lines.old_pre_error = source_pre_error;
+  old_lines.old_error_pre_print = error_pre_print;
+  make_cleanup (source_cleanup_lines, &old_lines);
+  source_line_number = 0;
+  source_file_name = file;
+  source_pre_error = error_pre_print == NULL ? "" : error_pre_print;
+  source_pre_error = savestring (source_pre_error, strlen (source_pre_error));
+  make_cleanup (free, source_pre_error);
+  /* This will get set every time we read a line.  So it won't stay "" for
+     long.  */
+  error_pre_print = "";
+
+  needed_length = strlen (source_file_name) + strlen (source_pre_error) + 80;
+  if (source_error_allocated < needed_length)
+    {
+      source_error_allocated *= 2;
+      if (source_error_allocated < needed_length)
+	source_error_allocated = needed_length;
+      if (source_error == NULL)
+	source_error = xmalloc (source_error_allocated);
+      else
+	source_error = xrealloc (source_error, source_error_allocated);
+    }
+
+  read_command_file (stream);
+
+  do_cleanups (old_cleanups);
+}
+
+/* ARGSUSED */
+static void
+echo_command (text, from_tty)
+     char *text;
+     int from_tty;
+{
+  char *p = text;
+  register int c;
+
+  if (text)
+    while ((c = *p++) != '\0')
+      {
+	if (c == '\\')
+	  {
+	    /* \ at end of argument is used after spaces
+	       so they won't be lost.  */
+	    if (*p == 0)
+	      return;
+
+	    c = parse_escape (&p);
+	    if (c >= 0)
+	      printf_filtered ("%c", c);
+	  }
+	else
+	  printf_filtered ("%c", c);
+      }
+
+  /* Force this output to appear now.  */
+  wrap_here ("");
+  gdb_flush (gdb_stdout);
+}
+
+/* ARGSUSED */
+static void
+dont_repeat_command (ignored, from_tty)
+     char *ignored;
+     int from_tty;
+{
+  *line = 0;		/* Can't call dont_repeat here because we're not
+			   necessarily reading from stdin.  */
+}
+
+/* Functions to manipulate command line editing control variables.  */
+
+/* Number of commands to print in each call to show_commands.  */
+#define Hist_print 10
+static void
+show_commands (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  /* Index for history commands.  Relative to history_base.  */
+  int offset;
+
+  /* Number of the history entry which we are planning to display next.
+     Relative to history_base.  */
+  static int num = 0;
+
+  /* The first command in the history which doesn't exist (i.e. one more
+     than the number of the last command).  Relative to history_base.  */
+  int hist_len;
+
+  extern HIST_ENTRY *history_get PARAMS ((int));
+
+  /* Print out some of the commands from the command history.  */
+  /* First determine the length of the history list.  */
+  hist_len = history_size;
+  for (offset = 0; offset < history_size; offset++)
+    {
+      if (!history_get (history_base + offset))
+	{
+	  hist_len = offset;
+	  break;
+	}
+    }
+
+  if (args)
+    {
+      if (args[0] == '+' && args[1] == '\0')
+	/* "info editing +" should print from the stored position.  */
+	;
+      else
+	/* "info editing <exp>" should print around command number <exp>.  */
+	num = (parse_and_eval_address (args) - history_base) - Hist_print / 2;
+    }
+  /* "show commands" means print the last Hist_print commands.  */
+  else
+    {
+      num = hist_len - Hist_print;
+    }
+
+  if (num < 0)
+    num = 0;
+
+  /* If there are at least Hist_print commands, we want to display the last
+     Hist_print rather than, say, the last 6.  */
+  if (hist_len - num < Hist_print)
+    {
+      num = hist_len - Hist_print;
+      if (num < 0)
+	num = 0;
+    }
+
+  for (offset = num; offset < num + Hist_print && offset < hist_len; offset++)
+    {
+      printf_filtered ("%5d  %s\n", history_base + offset,
+	      (history_get (history_base + offset))->line);
+    }
+
+  /* The next command we want to display is the next one that we haven't
+     displayed yet.  */
+  num += Hist_print;
+
+  /* If the user repeats this command with return, it should do what
+     "show commands +" does.  This is unnecessary if arg is null,
+     because "show commands +" is not useful after "show commands".  */
+  if (from_tty && args)
+    {
+      args[0] = '+';
+      args[1] = '\0';
+    }
+}
+
+/* Called by do_setshow_command.  */
+/* ARGSUSED */
+static void
+set_history_size_command (args, from_tty, c)
+     char *args;
+     int from_tty;
+     struct cmd_list_element *c;
+{
+  if (history_size == INT_MAX)
+    unstifle_history ();
+  else if (history_size >= 0)
+    stifle_history (history_size);
+  else
+    {
+      history_size = INT_MAX;
+      error ("History size must be non-negative");
+    }
+}
+
+/* ARGSUSED */
+static void
+set_history (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  printf_unfiltered ("\"set history\" must be followed by the name of a history subcommand.\n");
+  help_list (sethistlist, "set history ", -1, gdb_stdout);
+}
+
+/* ARGSUSED */
+static void
+show_history (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  cmd_show_list (showhistlist, from_tty, "");
+}
+
+int info_verbose = 0;		/* Default verbose msgs off */
+
+/* Called by do_setshow_command.  An elaborate joke.  */
+/* ARGSUSED */
+static void
+set_verbose (args, from_tty, c)
+     char *args;
+     int from_tty;
+     struct cmd_list_element *c;
+{
+  char *cmdname = "verbose";
+  struct cmd_list_element *showcmd;
+
+  showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
+
+  if (info_verbose)
+    {
+      c->doc = "Set verbose printing of informational messages.";
+      showcmd->doc = "Show verbose printing of informational messages.";
+    }
+  else
+    {
+      c->doc = "Set verbosity.";
+      showcmd->doc = "Show verbosity.";
+    }
+}
+
+static void
+float_handler (signo)
+int signo;
+{
+  /* This message is based on ANSI C, section 4.7.  Note that integer
+     divide by zero causes this, so "float" is a misnomer.  */
+  signal (SIGFPE, float_handler);
+  error ("Erroneous arithmetic operation.");
+}
+
+
+static void
+init_cmd_lists ()
+{
+  cmdlist = NULL;
+  infolist = NULL;
+  enablelist = NULL;
+  disablelist = NULL;
+  togglelist = NULL;
+  stoplist = NULL;
+  deletelist = NULL;
+  enablebreaklist = NULL;
+  setlist = NULL;
+  unsetlist = NULL;
+  showlist = NULL;
+  sethistlist = NULL;
+  showhistlist = NULL;
+  unsethistlist = NULL;
+  maintenancelist = NULL;
+  maintenanceinfolist = NULL;
+  maintenanceprintlist = NULL;
+  setprintlist = NULL;
+  showprintlist = NULL;
+  setchecklist = NULL;
+  showchecklist = NULL;
+}
+
+/* Init the history buffer.  Note that we are called after the init file(s)
+ * have been read so that the user can change the history file via his
+ * .gdbinit file (for instance).  The GDBHISTFILE environment variable
+ * overrides all of this.
+ */
+
+void
+init_history()
+{
+  char *tmpenv;
+
+  tmpenv = getenv ("HISTSIZE");
+  if (tmpenv)
+    history_size = atoi (tmpenv);
+  else if (!history_size)
+    history_size = 256;
+
+  stifle_history (history_size);
+
+  tmpenv = getenv ("GDBHISTFILE");
+  if (tmpenv)
+    history_filename = savestring (tmpenv, strlen(tmpenv));
+  else if (!history_filename) {
+    /* We include the current directory so that if the user changes
+       directories the file written will be the same as the one
+       that was read.  */
+    history_filename = concat (current_directory, "/.gdb_history", NULL);
+  }
+  read_history (history_filename);
+}
+
+static void
+init_main ()
+{
+  struct cmd_list_element *c;
+
+  /* If we are running the asynchronous version,
+     we initialize the prompts differently. */
+  if (!async_p)
+    {
+#ifdef DEFAULT_PROMPT
+      gdb_prompt_string = savestring (DEFAULT_PROMPT, strlen(DEFAULT_PROMPT));
+#else
+      gdb_prompt_string = savestring ("(gdb) ", 6);
+#endif
+    }
+  else
+    {
+      /* initialize the prompt stack to a simple "(gdb) " prompt or to
+	 whatever the DEFULAT_PROMPT is. */
+      the_prompts.top = 0;
+      PREFIX(0) = "";
+#ifdef DEFAULT_PROMPT
+      PROMPT(0) = savestring (DEFAULT_PROMPT, strlen(DEFAULT_PROMPT));
+#else
+      PROMPT(0) = savestring ("(gdb) ", 6);
+#endif
+      SUFFIX(0) = "";
+      /* Set things up for annotation_level > 1, if the user ever decides
+	 to use it. */
+      async_annotation_suffix = "prompt";
+      /* Set the variable associated with the setshow prompt command. */
+      new_async_prompt = savestring (PROMPT (0), strlen (PROMPT (0)));
+    }
+  gdb_prompt_escape = 0;	/* default to none.  */
+
+  /* Set the important stuff up for command editing.  */
+  command_editing_p = 1;
+  async_command_editing_p = 1;
+  history_expansion_p = 0;
+  write_history_p = 0;
+
+  /* Setup important stuff for command line editing.  */
+  rl_completion_entry_function = (int (*)()) readline_line_completion_function;
+  rl_completer_word_break_characters = gdb_completer_word_break_characters;
+  rl_completer_quote_characters = gdb_completer_quote_characters;
+  rl_readline_name = "gdb";
+
+  /* Define the classes of commands.
+     They will appear in the help list in the reverse of this order.  */
+
+  add_cmd ("internals", class_maintenance, NO_FUNCTION,
+	   "Maintenance commands.\n\
+Some gdb commands are provided just for use by gdb maintainers.\n\
+These commands are subject to frequent change, and may not be as\n\
+well documented as user commands.",
+	   &cmdlist);
+  add_cmd ("obscure", class_obscure, NO_FUNCTION, "Obscure features.", &cmdlist);
+  add_cmd ("aliases", class_alias, NO_FUNCTION, "Aliases of other commands.", &cmdlist);
+  add_cmd ("user-defined", class_user, NO_FUNCTION, "User-defined commands.\n\
+The commands in this class are those defined by the user.\n\
+Use the \"define\" command to define a command.", &cmdlist);
+  add_cmd ("support", class_support, NO_FUNCTION, "Support facilities.", &cmdlist);
+  if (!dbx_commands)
+    add_cmd ("status", class_info, NO_FUNCTION, "Status inquiries.", &cmdlist);
+  add_cmd ("files", class_files, NO_FUNCTION, "Specifying and examining files.", &cmdlist);
+  add_cmd ("breakpoints", class_breakpoint, NO_FUNCTION, "Making program stop at certain points.", &cmdlist);
+  add_cmd ("data", class_vars, NO_FUNCTION, "Examining data.", &cmdlist);
+  add_cmd ("stack", class_stack, NO_FUNCTION, "Examining the stack.\n\
+The stack is made up of stack frames.  Gdb assigns numbers to stack frames\n\
+counting from zero for the innermost (currently executing) frame.\n\n\
+At any time gdb identifies one frame as the \"selected\" frame.\n\
+Variable lookups are done with respect to the selected frame.\n\
+When the program being debugged stops, gdb selects the innermost frame.\n\
+The commands below can be used to select other frames by number or address.",
+	   &cmdlist);
+  add_cmd ("running", class_run, NO_FUNCTION, "Running the program.", &cmdlist);
+
+  add_com ("pwd", class_files, pwd_command,
+	   "Print working directory.  This is used for your program as well.");
+  c = add_cmd ("cd", class_files, cd_command,
+	   "Set working directory to DIR for debugger and program being debugged.\n\
+The change does not take effect for the program being debugged\n\
+until the next time it is started.", &cmdlist);
+  c->completer = filename_completer;
+
+  /* The set prompt command is different depending whether or not the
+     async version is run. NOTE: this difference is going to
+     disappear as we make the event loop be the default engine of
+     gdb. */
+  if (!async_p)
+    {
+      add_show_from_set
+	(add_set_cmd ("prompt", class_support, var_string, 
+		      (char *) &gdb_prompt_string, "Set gdb's prompt",
+		      &setlist),
+	 &showlist);
+    }
+  else
+    {
+      c = add_set_cmd ("prompt", class_support, var_string, 
+		      (char *)&new_async_prompt, "Set gdb's prompt",
+		       &setlist);
+      add_show_from_set (c, &showlist);
+      c->function.sfunc = set_async_prompt;
+    }
+
+  add_show_from_set
+    (add_set_cmd ("prompt-escape-char", class_support, var_zinteger, 
+		  (char *) &gdb_prompt_escape,
+		  "Set escape character for formatting of gdb's prompt",
+		  &setlist),
+     &showlist);
+
+  add_com ("echo", class_support, echo_command,
+	   "Print a constant string.  Give string as argument.\n\
+C escape sequences may be used in the argument.\n\
+No newline is added at the end of the argument;\n\
+use \"\\n\" if you want a newline to be printed.\n\
+Since leading and trailing whitespace are ignored in command arguments,\n\
+if you want to print some you must use \"\\\" before leading whitespace\n\
+to be printed or after trailing whitespace.");
+  add_com ("document", class_support, document_command,
+	   "Document a user-defined command.\n\
+Give command name as argument.  Give documentation on following lines.\n\
+End with a line of just \"end\".");
+  add_com ("define", class_support, define_command,
+	   "Define a new command name.  Command name is argument.\n\
+Definition appears on following lines, one command per line.\n\
+End with a line of just \"end\".\n\
+Use the \"document\" command to give documentation for the new command.\n\
+Commands defined in this way may have up to ten arguments.");
+
+#ifdef __STDC__
+  c = add_cmd ("source", class_support, source_command,
+	   "Read commands from a file named FILE.\n\
+Note that the file \"" GDBINIT_FILENAME "\" is read automatically in this way\n\
+when gdb is started.", &cmdlist);
+#else
+  /* Punt file name, we can't help it easily.  */
+  c = add_cmd ("source", class_support, source_command,
+	   "Read commands from a file named FILE.\n\
+Note that the file \".gdbinit\" is read automatically in this way\n\
+when gdb is started.", &cmdlist);
+#endif
+  c->completer = filename_completer;
+
+  add_com ("quit", class_support, quit_command, "Exit gdb.");
+  add_com ("help", class_support, help_command, "Print list of commands.");
+  add_com_alias ("q", "quit", class_support, 1);
+  add_com_alias ("h", "help", class_support, 1);
+
+  add_com ("dont-repeat", class_support, dont_repeat_command, "Don't repeat this command.\n\
+Primarily used inside of user-defined commands that should not be repeated when\n\
+hitting return.");
+
+  c = add_set_cmd ("verbose", class_support, var_boolean, (char *)&info_verbose,
+		   "Set ",
+		   &setlist),
+  add_show_from_set (c, &showlist);
+  c->function.sfunc = set_verbose;
+  set_verbose (NULL, 0, c);
+
+  /* The set editing command is different depending whether or not the
+     async version is run. NOTE: this difference is going to disappear
+     as we make the event loop be the default engine of gdb. */
+  if (!async_p)
+    {
+      add_show_from_set
+	(add_set_cmd ("editing", class_support, var_boolean, (char *)&command_editing_p,
+		      "Set editing of command lines as they are typed.\n\
+Use \"on\" to enable the editing, and \"off\" to disable it.\n\
+Without an argument, command line editing is enabled.  To edit, use\n\
+EMACS-like or VI-like commands like control-P or ESC.", &setlist),
+	 &showlist);
+    }
+  else
+    {
+      c = add_set_cmd ("editing", class_support, var_boolean, (char *)&async_command_editing_p,
+		       "Set editing of command lines as they are typed.\n\
+Use \"on\" to enable the editing, and \"off\" to disable it.\n\
+Without an argument, command line editing is enabled.  To edit, use\n\
+EMACS-like or VI-like commands like control-P or ESC.", &setlist);
+
+      add_show_from_set (c, &showlist);
+      c->function.sfunc = set_async_editing_command;
+    }
+
+  add_prefix_cmd ("history", class_support, set_history,
+		  "Generic command for setting command history parameters.",
+		  &sethistlist, "set history ", 0, &setlist);
+  add_prefix_cmd ("history", class_support, show_history,
+		  "Generic command for showing command history parameters.",
+		  &showhistlist, "show history ", 0, &showlist);
+
+  add_show_from_set
+    (add_set_cmd ("expansion", no_class, var_boolean, (char *)&history_expansion_p,
+	   "Set history expansion on command input.\n\
+Without an argument, history expansion is enabled.", &sethistlist),
+     &showhistlist);
+
+  add_show_from_set
+    (add_set_cmd ("save", no_class, var_boolean, (char *)&write_history_p,
+	   "Set saving of the history record on exit.\n\
+Use \"on\" to enable the saving, and \"off\" to disable it.\n\
+Without an argument, saving is enabled.", &sethistlist),
+     &showhistlist);
+
+  c = add_set_cmd ("size", no_class, var_integer, (char *)&history_size,
+		   "Set the size of the command history, \n\
+ie. the number of previous commands to keep a record of.", &sethistlist);
+  add_show_from_set (c, &showhistlist);
+  c->function.sfunc = set_history_size_command;
+
+  add_show_from_set
+    (add_set_cmd ("filename", no_class, var_filename, (char *)&history_filename,
+	   "Set the filename in which to record the command history\n\
+ (the list of previous commands of which a record is kept).", &sethistlist),
+     &showhistlist);
+
+  add_show_from_set
+    (add_set_cmd ("confirm", class_support, var_boolean,
+		  (char *)&caution,
+		  "Set whether to confirm potentially dangerous operations.",
+		  &setlist),
+     &showlist);
+
+  add_prefix_cmd ("info", class_info, info_command,
+        "Generic command for showing things about the program being debugged.",
+		  &infolist, "info ", 0, &cmdlist);
+  add_com_alias ("i", "info", class_info, 1);
+
+  add_com ("complete", class_obscure, complete_command,
+	   "List the completions for the rest of the line as a command.");
+
+  add_prefix_cmd ("show", class_info, show_command,
+		  "Generic command for showing things about the debugger.",
+		  &showlist, "show ", 0, &cmdlist);
+  /* Another way to get at the same thing.  */
+  add_info ("set", show_command, "Show all GDB settings.");
+
+  add_cmd ("commands", no_class, show_commands,
+	   "Show the history of commands you typed.\n\
+You can supply a command number to start with, or a `+' to start after\n\
+the previous command number shown.",
+	   &showlist);
+
+  add_cmd ("version", no_class, show_version,
+	   "Show what version of GDB this is.", &showlist);
+
+  add_com ("while", class_support, while_command,
+"Execute nested commands WHILE the conditional expression is non zero.\n\
+The conditional expression must follow the word `while' and must in turn be\n\
+followed by a new line.  The nested commands must be entered one per line,\n\
+and should be terminated by the word `end'.");
+
+  add_com ("if", class_support, if_command,
+"Execute nested commands once IF the conditional expression is non zero.\n\
+The conditional expression must follow the word `if' and must in turn be\n\
+followed by a new line.  The nested commands must be entered one per line,\n\
+and should be terminated by the word 'else' or `end'.  If an else clause\n\
+is used, the same rules apply to its nested commands as to the first ones.");
+
+  /* If target is open when baud changes, it doesn't take effect until the
+     next open (I think, not sure).  */
+  add_show_from_set (add_set_cmd ("remotebaud", no_class,
+				  var_zinteger, (char *)&baud_rate,
+				  "Set baud rate for remote serial I/O.\n\
+This value is used to set the speed of the serial port when debugging\n\
+using remote targets.", &setlist),
+		     &showlist);
+
+  add_show_from_set (
+    add_set_cmd ("remotedebug", no_class, var_zinteger, (char *)&remote_debug,
+		   "Set debugging of remote protocol.\n\
+When enabled, each packet sent or received with the remote target\n\
+is displayed.", &setlist),
+		     &showlist);
+
+  add_show_from_set (
+    add_set_cmd ("remotetimeout", no_class, var_integer, (char *)&remote_timeout,
+		   "Set timeout limit to wait for target to respond.\n\
+This value is used to set the time limit for gdb to wait for a response\n\
+from the target.", &setlist),
+		     &showlist);
+
+  /* The set annotate command is different depending whether or not
+     the async version is run. NOTE: this difference is going to
+     disappear as we make the event loop be the default engine of
+     gdb. */
+  if (!async_p)
+    {
+      c = add_set_cmd ("annotate", class_obscure, var_zinteger, 
+		       (char *)&annotation_level, "Set annotation_level.\n\
+0 == normal;     1 == fullname (for use when running under emacs)\n\
+2 == output annotated suitably for use by programs that control GDB.",
+		       &setlist);
+      c = add_show_from_set (c, &showlist);
+    }
+  else
+    {
+      c = add_set_cmd ("annotate", class_obscure, var_zinteger, 
+		       (char *)&annotation_level, "Set annotation_level.\n\
+0 == normal;     1 == fullname (for use when running under emacs)\n\
+2 == output annotated suitably for use by programs that control GDB.",
+		       &setlist);     
+      add_show_from_set (c, &showlist);
+      c->function.sfunc = set_async_annotation_level;
+    }
+}