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/* Handle set and show GDB commands.

   Copyright 2000, 2001, 2002 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "value.h"

#include <ctype.h>

#include "gdb_string.h"

#include "ui-out.h"

#include "cli/cli-decode.h"

#include "cli/cli-cmds.h"

#include "cli/cli-setshow.h"

/* Prototypes for local functions */

static int parse_binary_operation (char *);

static enum auto_boolean

parse_auto_binary_operation (const char *arg)

{

  if (arg != NULL && *arg != '\0')

    {

      int length = strlen (arg);

      while (isspace (arg[length - 1]) && length > 0)

        length--;

      if (strncmp (arg, "on", length) == 0

          || strncmp (arg, "1", length) == 0

          || strncmp (arg, "yes", length) == 0

          || strncmp (arg, "enable", length) == 0)

        return AUTO_BOOLEAN_TRUE;

      else if (strncmp (arg, "off", length) == 0

               || strncmp (arg, "0", length) == 0

               || strncmp (arg, "no", length) == 0

               || strncmp (arg, "disable", length) == 0)

        return AUTO_BOOLEAN_FALSE;

      else if (strncmp (arg, "auto", length) == 0

               || (strncmp (arg, "-1", length) == 0 && length > 1))

        return AUTO_BOOLEAN_AUTO;

    }

  error ("\"on\", \"off\" or \"auto\" expected.");

  return AUTO_BOOLEAN_AUTO; /* pacify GCC */

}

static int

parse_binary_operation (char *arg)

{

  int length;

  if (!arg || !*arg)

    return 1;

  length = strlen (arg);

  while (arg[length - 1] == ' ' || arg[length - 1] == '\t')

    length--;

  if (strncmp (arg, "on", length) == 0

      || strncmp (arg, "1", length) == 0

      || strncmp (arg, "yes", length) == 0

      || strncmp (arg, "enable", length) == 0)

    return 1;

  else if (strncmp (arg, "off", length) == 0

           || strncmp (arg, "0", length) == 0

           || strncmp (arg, "no", length) == 0

           || strncmp (arg, "disable", length) == 0)

    return 0;

  else

    {

      error ("\"on\" or \"off\" expected.");

      return 0;

    }

}

/* Do a "set" or "show" command.  ARG is NULL if no argument, or the text

   of the argument, and FROM_TTY is nonzero if this command is being entered

   directly by the user (i.e. these are just like any other

   command).  C is the command list element for the command.  */

void

do_setshow_command (char *arg, int from_tty, struct cmd_list_element *c)

{

  if (c->type == set_cmd)

    {

      switch (c->var_type)

        {

        case var_string:

          {

            char *new;

            char *p;

            char *q;

            int ch;

            if (arg == NULL)

              arg = "";

            new = (char *) xmalloc (strlen (arg) + 2);

            p = arg;

            q = new;

            while ((ch = *p++) != '\000')

              {

                if (ch == '\\')

                  {

                    /* \ at end of argument is used after spaces

                       so they won't be lost.  */

                    /* This is obsolete now that we no longer strip

                       trailing whitespace and actually, the backslash

                       didn't get here in my test, readline or

                       something did something funky with a backslash

                       right before a newline.  */

                    if (*p == 0)

                      break;

                    ch = parse_escape (&p);

                    if (ch == 0)

                      break;    /* C loses */

                    else if (ch > 0)

                      *q++ = ch;

                  }

                else

                  *q++ = ch;

              }

#if 0

            if (*(p - 1) != '\\')

              *q++ = ' ';

#endif

            *q++ = '\0';

            new = (char *) xrealloc (new, q - new);

            if (*(char **) c->var != NULL)

              xfree (*(char **) c->var);

            *(char **) c->var = new;

          }

          break;

        case var_string_noescape:

          if (arg == NULL)

            arg = "";

          if (*(char **) c->var != NULL)

            xfree (*(char **) c->var);

          *(char **) c->var = savestring (arg, strlen (arg));

          break;

        case var_filename:

          if (arg == NULL)

            error_no_arg ("filename to set it to.");

          if (*(char **) c->var != NULL)

            xfree (*(char **) c->var);

          *(char **) c->var = tilde_expand (arg);

          break;

        case var_boolean:

          *(int *) c->var = parse_binary_operation (arg);

          break;

        case var_auto_boolean:

          *(enum auto_boolean *) c->var = parse_auto_binary_operation (arg);

          break;

        case var_uinteger:

          if (arg == NULL)

            error_no_arg ("integer to set it to.");

          *(unsigned int *) c->var = parse_and_eval_long (arg);

          if (*(unsigned int *) c->var == 0)

            *(unsigned int *) c->var = UINT_MAX;

          break;

        case var_integer:

          {

            unsigned int val;

            if (arg == NULL)

              error_no_arg ("integer to set it to.");

            val = parse_and_eval_long (arg);

            if (val == 0)

              *(int *) c->var = INT_MAX;

            else if (val >= INT_MAX)

              error ("integer %u out of range", val);

            else

              *(int *) c->var = val;

            break;

          }

        case var_zinteger:

          if (arg == NULL)

            error_no_arg ("integer to set it to.");

          *(int *) c->var = parse_and_eval_long (arg);

          break;

        case var_enum:

          {

            int i;

            int len;

            int nmatches;

            const char *match = NULL;

            char *p;

            /* if no argument was supplied, print an informative error message */

            if (arg == NULL)

              {

                char msg[1024];

                strcpy (msg, "Requires an argument. Valid arguments are ");

                for (i = 0; c->enums[i]; i++)

                  {

                    if (i != 0)

                      strcat (msg, ", ");

                    strcat (msg, c->enums[i]);

                  }

                strcat (msg, ".");

                error (msg);

              }

            p = strchr (arg, ' ');

            if (p)

              len = p - arg;

            else

              len = strlen (arg);

            nmatches = 0;

            for (i = 0; c->enums[i]; i++)

              if (strncmp (arg, c->enums[i], len) == 0)

                {

                  if (c->enums[i][len] == '\0')

                    {

                      match = c->enums[i];

                      nmatches = 1;

                      break; /* exact match. */

                    }

                  else

                    {

                      match = c->enums[i];

                      nmatches++;

                    }

                }

            if (nmatches <= 0)

              error ("Undefined item: \"%s\".", arg);

            if (nmatches > 1)

              error ("Ambiguous item \"%s\".", arg);

            *(const char **) c->var = match;

          }

          break;

        default:

          error ("gdb internal error: bad var_type in do_setshow_command");

        }

    }

  else if (c->type == show_cmd)

    {

      struct cleanup *old_chain;

      struct ui_stream *stb;

      int quote;

      stb = ui_out_stream_new (uiout);

      old_chain = make_cleanup_ui_out_stream_delete (stb);

      /* Possibly call the pre hook.  */

      if (c->pre_show_hook)

        (c->pre_show_hook) (c);

      /* Print doc minus "show" at start.  */

      print_doc_line (gdb_stdout, c->doc + 5);

      ui_out_text (uiout, " is ");

      ui_out_wrap_hint (uiout, "    ");

      quote = 0;

      switch (c->var_type)

        {

        case var_string:

          {

            unsigned char *p;

            if (*(unsigned char **) c->var)

              fputstr_filtered (*(unsigned char **) c->var, '"', stb->stream);

            quote = 1;

          }

          break;

        case var_string_noescape:

        case var_filename:

        case var_enum:

          if (*(char **) c->var)

            fputs_filtered (*(char **) c->var, stb->stream);

          quote = 1;

          break;

        case var_boolean:

          fputs_filtered (*(int *) c->var ? "on" : "off", stb->stream);

          break;

        case var_auto_boolean:

          switch (*(enum auto_boolean*) c->var)

            {

            case AUTO_BOOLEAN_TRUE:

              fputs_filtered ("on", stb->stream);

              break;

            case AUTO_BOOLEAN_FALSE:

              fputs_filtered ("off", stb->stream);

              break;

            case AUTO_BOOLEAN_AUTO:

              fputs_filtered ("auto", stb->stream);

              break;

            default:

              internal_error (__FILE__, __LINE__,

                              "do_setshow_command: invalid var_auto_boolean");

              break;

            }

          break;

        case var_uinteger:

          if (*(unsigned int *) c->var == UINT_MAX)

            {

              fputs_filtered ("unlimited", stb->stream);

              break;

            }

          /* else fall through */

        case var_zinteger:

          fprintf_filtered (stb->stream, "%u", *(unsigned int *) c->var);

          break;

        case var_integer:

          if (*(int *) c->var == INT_MAX)

            {

              fputs_filtered ("unlimited", stb->stream);

            }

          else

            fprintf_filtered (stb->stream, "%d", *(int *) c->var);

          break;

        default:

          error ("gdb internal error: bad var_type in do_setshow_command");

        }

      if (quote)

        ui_out_text (uiout, "\"");

      ui_out_field_stream (uiout, "value", stb);

      if (quote)

        ui_out_text (uiout, "\"");

      ui_out_text (uiout, ".\n");

      do_cleanups (old_chain);

    }

  else

    error ("gdb internal error: bad cmd_type in do_setshow_command");

  c->func (c, NULL, from_tty);

  if (c->type == set_cmd && set_hook)

    set_hook (c);

}

/* Show all the settings in a list of show commands.  */

void

cmd_show_list (struct cmd_list_element *list, int from_tty, char *prefix)

{

  ui_out_tuple_begin (uiout, "showlist");

  for (; list != NULL; list = list->next)

    {

      /* If we find a prefix, run its list, prefixing our output by its

         prefix (with "show " skipped).  */

      if (list->prefixlist && !list->abbrev_flag)

        {

          ui_out_tuple_begin (uiout, "optionlist");

          ui_out_field_string (uiout, "prefix", list->prefixname + 5);

          cmd_show_list (*list->prefixlist, from_tty, list->prefixname + 5);

          ui_out_tuple_end (uiout);

        }

      if (list->type == show_cmd)

        {

          ui_out_tuple_begin (uiout, "option");

          ui_out_text (uiout, prefix);

          ui_out_field_string (uiout, "name", list->name);

          ui_out_text (uiout, ":  ");

          do_setshow_command ((char *) NULL, from_tty, list);

          ui_out_tuple_end (uiout);

        }

    }

  ui_out_tuple_end (uiout);

}