This file is shopt.def, from which is created shopt.c.
It implements the Bash `shopt' builtin.

Copyright (C) 1994 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

Bash 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 1, or (at your option) any later
version.

Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

$PRODUCES shopt.c

$BUILTIN shopt
$DOCNAME shopt_builtin
$FUNCTION shopt_builtin
$SHORT_DOC shopt [-pqsu] [-o long-option] optname [optname...]
Toggle the values of variables controlling optional behavior.
The -s flag means to enable (set) each OPTNAME; the -u flag
unsets each OPTNAME.  The -q flag suppresses output; the exit
status indicates whether each OPTNAME is set or unset.  The -o
option restricts the OPTNAMEs to those defined for use with
`set -o'.  With no options, or with the -p option, a list of all
settable options is displayed, with an indication of whether or
not each is set.
$END

#include <config.h>

#if defined (HAVE_UNISTD_H)
#  ifdef _MINIX
#    include <sys/types.h>
#  endif
#  include <unistd.h>
#endif

#include <stdio.h>

#include "../shell.h"
#include "../flags.h"
#include "common.h"
#include "bashgetopt.h"

#define UNSETOPT	0
#define SETOPT		1

#define OPTFMT		"%-15s\t%s\n"

extern int allow_null_glob_expansion, glob_dot_filenames;
extern int cdable_vars, mail_warning, source_uses_path;
extern int no_exit_on_failed_exec, print_shift_error;
extern int check_hashed_filenames, promptvars, interactive_comments;
extern int cdspelling, expand_aliases;
extern int check_window_size;
extern int glob_ignore_case;
extern int hup_on_exit;

#if defined (EXTENDED_GLOB)
extern int extended_glob;
#endif

#if defined (HISTORY)
extern int literal_history, command_oriented_history;
extern int force_append_history;
#endif

#if defined (READLINE)
extern int hist_verify, history_reediting, perform_hostname_completion;
extern void enable_hostname_completion ();
#endif

#if defined (RESTRICTED_SHELL)
extern int restricted_shell;
extern char *shell_name;
#endif

extern void set_shellopts ();

static int set_interactive_comments ();

#if defined (RESTRICTED_SHELL)
static int set_restricted_shell ();
#endif

static struct {
  char *name;
  int  *value;
  Function *set_func;
} shopt_vars[] = {
  { "cdable_vars", &cdable_vars, (Function *)NULL },
  { "cdspell", &cdspelling, (Function *)NULL },
  { "checkhash", &check_hashed_filenames, (Function *)NULL },
  { "checkwinsize", &check_window_size, (Function *)NULL },
#if defined (HISTORY)
  { "cmdhist", &command_oriented_history, (Function *)NULL },
#endif
  { "dotglob", &glob_dot_filenames, (Function *)NULL },
  { "execfail", &no_exit_on_failed_exec, (Function *)NULL },
  { "expand_aliases", &expand_aliases, (Function *)NULL },
#if defined (EXTENDED_GLOB)
  { "extglob", &extended_glob, (Function *)NULL },
#endif
#if defined (READLINE)
  { "histreedit", &history_reediting, (Function *)NULL },
#endif
#if defined (HISTORY)
  { "histappend", &force_append_history, (Function *)NULL },
#endif
#if defined (READLINE)
  { "histverify", &hist_verify, (Function *)NULL },
  { "hostcomplete", &perform_hostname_completion, (Function *)enable_hostname_completion },
#endif
  { "huponexit", &hup_on_exit, (Function *)NULL },
  { "interactive_comments", &interactive_comments, set_interactive_comments },
#if defined (HISTORY)
  { "lithist", &literal_history, (Function *)NULL },
#endif
  { "mailwarn", &mail_warning, (Function *)NULL },
  { "nocaseglob", &glob_ignore_case, (Function *)NULL },
  { "nullglob",	&allow_null_glob_expansion, (Function *)NULL },
  { "promptvars", &promptvars, (Function *)NULL },
#if defined (RESTRICTED_SHELL)
  { "restricted_shell", &restricted_shell, set_restricted_shell },
#endif
  { "shift_verbose", &print_shift_error, (Function *)NULL },
  { "sourcepath", &source_uses_path, (Function *)NULL },
  { (char *)0, (int *)0, (Function *)NULL }
};

static char *on = "on";
static char *off = "off";

static int list_shopt_o_options ();
static int list_some_o_options (), list_some_shopts ();
static int toggle_shopts (), list_shopts (), set_shopt_o_options ();

#define SFLAG	0x01
#define UFLAG	0x02
#define QFLAG	0x04
#define OFLAG	0x08
#define PFLAG	0x10

int
shopt_builtin (list)
     WORD_LIST *list;
{
  int opt, flags, rval;

  flags = 0;
  reset_internal_getopt ();
  while ((opt = internal_getopt (list, "psuoq")) != -1)
    {
      switch (opt)
	{
	case 's':
	  flags |= SFLAG;
	  break;
	case 'u':
	  flags |= UFLAG;
	  break;
	case 'q':
	  flags |= QFLAG;
	  break;
	case 'o':
	  flags |= OFLAG;
	  break;
	case 'p':
	  flags |= PFLAG;
	  break;
	default:
	  builtin_usage ();
	  return (EX_USAGE);
	}
    }
  list = loptend;

  if ((flags & (SFLAG|UFLAG)) == (SFLAG|UFLAG))
    {
      builtin_error ("cannot set and unset shell options simultaneously");
      return (EXECUTION_FAILURE);
    }

  rval = EXECUTION_SUCCESS;
  if ((flags & OFLAG) && ((flags & (SFLAG|UFLAG)) == 0))	/* shopt -o */
    rval = list_shopt_o_options (list, flags);
  else if (list && (flags & OFLAG))		/* shopt -so args */
    rval = set_shopt_o_options ((flags & SFLAG) ? FLAG_ON : FLAG_OFF, list, flags & QFLAG);
  else if (flags & OFLAG)	/* shopt -so */
    rval = list_some_o_options ((flags & SFLAG) ? 1 : 0, flags);
  else if (list && (flags & (SFLAG|UFLAG)))	/* shopt -su args */
    rval = toggle_shopts ((flags & SFLAG) ? SETOPT : UNSETOPT, list, flags & QFLAG);
  else if ((flags & (SFLAG|UFLAG)) == 0)	/* shopt [args] */
    rval = list_shopts (list, flags);
  else						/* shopt -su */
    rval = list_some_shopts ((flags & SFLAG) ? SETOPT : UNSETOPT, flags);
  return (rval);
}

/* Reset the options managed by `shopt' to the values they would have at
   shell startup. */
void
reset_shopt_options ()
{
  allow_null_glob_expansion = glob_dot_filenames = 0;
  cdable_vars = mail_warning = 0;
  no_exit_on_failed_exec = print_shift_error = 0;
  check_hashed_filenames = cdspelling = expand_aliases = check_window_size = 0;

  source_uses_path = promptvars = 1;

#if defined (EXTENDED_GLOB)
  extended_glob = 0;
#endif

#if defined (HISTORY)
  literal_history = force_append_history = 0;
  command_oriented_history = 1;
#endif

#if defined (READLINE)
  hist_verify = history_reediting = 0;
  perform_hostname_completion = 1;
#endif
}

static int
find_shopt (name)
     char *name;
{
  int i;

  for (i = 0; shopt_vars[i].name; i++)
    if (STREQ (name, shopt_vars[i].name))
      return i;
  return -1;
}

#define SHOPT_ERROR(str)	builtin_error ("%s: unknown shell option name", str)

static int
toggle_shopts (mode, list, quiet)
     int mode;
     WORD_LIST *list;
     int quiet;
{
  WORD_LIST *l;
  int ind, rval;

  for (l = list, rval = EXECUTION_SUCCESS; l; l = l->next)
    {
      ind = find_shopt (l->word->word);
      if (ind < 0)
	{
	  SHOPT_ERROR (l->word->word);
	  rval = EXECUTION_FAILURE;
	}
      else
	{
	  *shopt_vars[ind].value = mode;	/* 1 for set, 0 for unset */
	  if (shopt_vars[ind].set_func)
	    (*shopt_vars[ind].set_func) (mode);
	}
    }
  return (rval);
}

static void
print_shopt (name, val, flags)
     char *name;
     int val, flags;
{
  if (flags & PFLAG)
    printf ("shopt %s %s\n", val ? "-s" : "-u", name);
  else
    printf (OPTFMT, name, val ? on : off);
}

/* List the values of all or any of the `shopt' options.  Returns 0 if
   all were listed or all variables queried were on; 1 otherwise. */
static int
list_shopts (list, flags)
     WORD_LIST *list;
     int flags;
{
  WORD_LIST *l;
  int i, val, rval;

  if (list == 0)
    {
      for (i = 0; shopt_vars[i].name; i++)
	{
	  val = *shopt_vars[i].value;
	  if ((flags & QFLAG) == 0)
	    print_shopt (shopt_vars[i].name, val, flags);
	}
      return (EXECUTION_SUCCESS);
    }

  for (l = list, rval = EXECUTION_SUCCESS; l; l = l->next)
    {
      i = find_shopt (l->word->word);
      if (i < 0)
	{
	  SHOPT_ERROR (l->word->word);
	  rval = EXECUTION_FAILURE;
	  continue;
	}
      val = *shopt_vars[i].value;
      if (val == 0)
	rval = EXECUTION_FAILURE;
      if ((flags & QFLAG) == 0)
        print_shopt (l->word->word, val, flags);
    }
  return (rval);
}

static int
list_some_shopts (mode, flags)
     int mode, flags;
{
  int val, i;

  for (i = 0; shopt_vars[i].name; i++)
    {
      val = *shopt_vars[i].value;
      if (((flags & QFLAG) == 0) && mode == val)
	print_shopt (shopt_vars[i].name, val, flags);
    }
  return (EXECUTION_SUCCESS);
}

static int
list_shopt_o_options (list, flags)
     WORD_LIST *list;
     int flags;
{
  WORD_LIST *l;
  int val, rval;

  if (list == 0)
    {
      if ((flags & QFLAG) == 0)
	list_minus_o_opts (-1, (flags & PFLAG));
      return (EXECUTION_SUCCESS);
    }

  for (l = list, rval = EXECUTION_SUCCESS; l; l = l->next)
    {
      val = minus_o_option_value (l->word->word);
      if (val == -1)
	{
	  builtin_error ("%s: unknown option name", l->word->word);
	  rval = EXECUTION_FAILURE;
	  continue;
	}
      if (val == 0)
	rval = EXECUTION_FAILURE;
      if ((flags & QFLAG) == 0)
	{
	  if (flags & PFLAG)
	    printf ("set %co %s\n", val ? '-' : '+', l->word->word);
	  else
	    printf (OPTFMT, l->word->word, val ? on : off);
	}
    }
  return (rval);
}

static int
list_some_o_options (mode, flags)
     int mode, flags;
{
  if ((flags & QFLAG) == 0)
    list_minus_o_opts (mode, (flags & PFLAG));
  return (EXECUTION_SUCCESS);
}

static int
set_shopt_o_options (mode, list, quiet)
     int mode;
     WORD_LIST *list;
     int quiet;
{
  WORD_LIST *l;
  int rval;

  for (l = list, rval = EXECUTION_SUCCESS; l; l = l->next)
    {
      if (set_minus_o_option (mode, l->word->word) == EXECUTION_FAILURE)
	rval = EXECUTION_FAILURE;
    }
  set_shellopts ();
  return rval;
}

/* If we set or unset interactive_comments with shopt, make sure the
   change is reflected in $SHELLOPTS. */
static int
set_interactive_comments (mode)
     int mode;
{
  set_shellopts ();
  return (0);
}

#if defined (RESTRICTED_SHELL)
/* Don't allow the value of restricted_shell to be modified. */

static int
set_restricted_shell (mode)
     int mode;
{
  static int save_restricted = -1;

  if (save_restricted == -1)
    save_restricted = shell_is_restricted (shell_name);

  restricted_shell = save_restricted;
  return (0);
}
#endif /* RESTRICTED_SHELL */
