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/* Handle set and show GDB commands.

   Copyright (c) 2000, 2001, 2002, 2003, 2007, 2008

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "readline/tilde.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;

    }

}

void

deprecated_show_value_hack (struct ui_file *ignore_file,

                            int ignore_from_tty,

                            struct cmd_list_element *c,

                            const char *value)

{

  /* If there's no command or value, don't try to print it out.  */

  if (c == NULL || value == NULL)

    return;

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

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

  switch (c->var_type)

    {

    case var_string:

    case var_string_noescape:

    case var_optional_filename:

    case var_filename:

    case var_enum:

      printf_filtered ((" is \"%s\".\n"), value);

      break;

    default:

      printf_filtered ((" is %s.\n"), value);

      break;

    }

}

/* 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_optional_filename:

          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);

          {

            /* Clear trailing whitespace of filename.  */

            char *ptr = arg + strlen (arg) - 1;

            while (ptr >= arg && (*ptr == ' ' || *ptr == '\t'))

              ptr--;

            *(ptr + 1) = '\0';

          }

          *(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;

                int msg_len = 0;

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

                  msg_len += strlen (c->enums[i]) + 2;

                msg = xmalloc (msg_len);

                *msg = '\0';

                make_cleanup (xfree, msg);

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

                  {

                    if (i != 0)

                      strcat (msg, ", ");

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

                  }

                error (_("Requires an argument. Valid arguments are %s."), 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;

      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);

      switch (c->var_type)

        {

        case var_string:

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

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

          break;

        case var_string_noescape:

        case var_optional_filename:

        case var_filename:

        case var_enum:

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

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

          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"));

        }

      /* FIXME: cagney/2005-02-10: Need to split this in half: code to

         convert the value into a string (esentially the above); and

         code to print the value out.  For the latter there should be

         MI and CLI specific versions.  */

      if (ui_out_is_mi_like_p (uiout))

        ui_out_field_stream (uiout, "value", stb);

      else

        {

          long length;

          char *value = ui_file_xstrdup (stb->stream, &length);

          make_cleanup (xfree, value);

          if (c->show_value_func != NULL)

            c->show_value_func (gdb_stdout, from_tty, c, value);

          else

            deprecated_show_value_hack (gdb_stdout, from_tty, c, value);

        }

      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 && deprecated_set_hook)

    deprecated_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)

{

  struct cleanup *showlist_chain;

  showlist_chain = make_cleanup_ui_out_tuple_begin_end (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)

        {

          struct cleanup *optionlist_chain

            = make_cleanup_ui_out_tuple_begin_end (uiout, "optionlist");

          char *new_prefix = strstr (list->prefixname, "show ") + 5;

          if (ui_out_is_mi_like_p (uiout))

            ui_out_field_string (uiout, "prefix", new_prefix);

          cmd_show_list (*list->prefixlist, from_tty, new_prefix);

          /* Close the tuple.  */

          do_cleanups (optionlist_chain);

        }

      else

        {

          struct cleanup *option_chain

            = make_cleanup_ui_out_tuple_begin_end (uiout, "option");

          ui_out_text (uiout, prefix);

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

          ui_out_text (uiout, ":  ");

          if (list->type == show_cmd)

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

          else

            cmd_func (list, NULL, from_tty);

          /* Close the tuple.  */

          do_cleanups (option_chain);

        }

    }

  /* Close the tuple.  */

  do_cleanups (showlist_chain);

}