xref: /onnv-gate/usr/src/cmd/parted/ui.c (revision 9663:ace9a2ac3683)

/*
    parted - a frontend to libparted
    Copyright (C) 1999, 2000, 2001, 2002, 2006, 2007
    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 <parted/parted.h>
#include <parted/debug.h>

#include <ctype.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <setjmp.h>

#include <config.h>
#include "command.h"
#include "strlist.h"
#include "ui.h"
#include "error.h"

#define N_(String) String
#if ENABLE_NLS
#  include <libintl.h>
#  include <locale.h>
#  define _(String) dgettext (PACKAGE, String)
#else
#  define _(String) (String)
#endif /* ENABLE_NLS */

#ifdef HAVE_LIBREADLINE

#ifdef HAVE_TERMCAP_H
#include <termcap.h>
#else
extern int tgetnum (char* key);
#endif

#include <readline/readline.h>
#include <readline/history.h>

#ifndef HAVE_RL_COMPLETION_MATCHES
#define rl_completion_matches completion_matches
#endif

#ifndef rl_compentry_func_t
#define rl_compentry_func_t void
#endif

#endif /* HAVE_LIBREADLINE */

#ifndef SA_SIGINFO
#  ifndef HAVE_SIGACTION

struct sigaction {
};

static inline int
sigaction (int signum, const struct* sigaction, struct* sigaction)
{
}

#  endif /* HAVE_SIGACTON */

struct siginfo_t {
        int si_code;
};

#endif /* SA_SIGINFO */

#ifndef SEGV_MAPERR
#  define SEGV_MAPERR (INTMAX - 1)
#endif

#ifndef SEGV_ACCERR
#  define SEGV_ACCERR (INTMAX - 2)
#endif

#ifndef FPE_INTDIV
#  define FPE_INTDIV (INTMAX - 1)
#endif

#ifndef FPE_INTOVF
#  define FPE_INTOVF (INTMAX - 2)
#endif

#ifndef FPE_FLTDIV
#  define FPE_FLTDIV (INTMAX - 3)
#endif

#ifndef FPE_FLTOVF
#  define FPE_FLTOVF (INTMAX - 4)
#endif

#ifndef FPE_FLTUND
#  define FPE_FLTUND (INTMAX - 5)
#endif

#ifndef FPE_FLTRES
#  define FPE_FLTRES (INTMAX - 6)
#endif

#ifndef FPE_FLTINV
#  define FPE_FLTINV (INTMAX - 7)
#endif

#ifndef FPE_FLTSUB
#  define FPE_FLTSUB (INTMAX - 8)
#endif

#ifndef ILL_ILLOPC
#  define ILL_ILLOPC (INTMAX - 1)
#endif

#ifndef ILL_ILLOPN
#  define ILL_ILLOPN (INTMAX - 2)
#endif

#ifndef ILL_ILLADR
#  define ILL_ILLADR (INTMAX - 3)
#endif

#ifndef ILL_ILLTRP
#  define ILL_ILLTRP (INTMAX - 4)
#endif

#ifndef ILL_PRVOPC
#  define ILL_PRVOPC (INTMAX - 5)
#endif

#ifndef ILL_PRVREG
#  define ILL_PRVREG (INTMAX - 6)
#endif

#ifndef ILL_COPROC
#  define ILL_COPROC (INTMAX - 7)
#endif

#ifndef ILL_BADSTK
#  define ILL_BADSTK (INTMAX - 8)
#endif

char* prog_name = "GNU Parted " VERSION "\n";

static char* banner_msg = N_(
"Welcome to GNU Parted! Type 'help' to view a list of commands.\n");

static char* usage_msg = N_(
"Usage: parted [OPTION]... [DEVICE [COMMAND [PARAMETERS]...]...]\n"
"Apply COMMANDs with PARAMETERS to DEVICE.  If no COMMAND(s) are given, "
"run in\ninteractive mode.\n");

static char* bug_msg = N_(
"\n\nYou found a bug in GNU Parted! Here's what you have to do:\n\n"
"Don't panic! The bug has most likely not affected any of your data.\n"
"Help us to fix this bug by doing the following:\n\n"
"Check whether the bug has already been fixed by checking\n"
"the last version of GNU Parted that you can find at:\n\n"
"\thttp://ftp.gnu.org/gnu/parted/\n\n"
"Please check this version prior to bug reporting.\n\n"
"If this has not been fixed yet or if you don't know how to check,\n"
"please visit the GNU Parted website:\n\n"
"\thttp://www.gnu.org/software/parted\n\n"
"for further information.\n\n"
"Your report should contain the version of this release (%s)\n"
"along with the error message below, the output of\n\n"
"\tparted DEVICE unit co print unit s print\n\n"
"and the following history of commands you entered.\n"
"Also include any additional information about your setup you\n"
"consider important.\n");

#define MAX_WORDS    1024

static StrList*     command_line;
static Command**    commands;
static StrList*     ex_opt_str [64];
static StrList*     on_list;
static StrList*     off_list;
static StrList*     on_off_list;
static StrList*     fs_type_list;
static StrList*     disk_type_list;

static struct {
        const StrList*    possibilities;
        const StrList*    cur_pos;
        int               in_readline;
        sigjmp_buf        jmp_state;
} readline_state;

static struct sigaction    sig_segv;
static struct sigaction    sig_int;
static struct sigaction    sig_fpe;
static struct sigaction    sig_ill;

volatile int got_ctrl_c = 0;    /* used in exception_handler */

int
screen_width ()
{
        int    width = 0;

        if (opt_script_mode || pretend_input_tty)
                return 32768;    /* no wrapping ;) */

/* HACK: don't specify termcap separately - it'll annoy the users. */
#ifdef HAVE_LIBREADLINE
        width = tgetnum ("co");
#endif

        if (width <= 0)
                width = 80;

        return width;
}

void
wipe_line ()
{
        if (opt_script_mode)
                return;

        /* yuck */
        fputs ("\r                                     "
               "                                     \r", stdout);
}

#ifdef HAVE_LIBREADLINE
/* returns matching commands for text */
static char*
command_generator (char* text, int state)
{
        if (!state)
                readline_state.cur_pos = readline_state.possibilities;

        while (readline_state.cur_pos) {
                const StrList*    cur = readline_state.cur_pos;
                readline_state.cur_pos = cur->next;
                if (str_list_match_node (cur, text))
                        return str_list_convert_node (cur);
        }

        return NULL;
}

/* completion function for readline() */
char**
complete_function (char* text, int start, int end)
{
        return rl_completion_matches (text,
                (rl_compentry_func_t*) command_generator);
}

static void
_add_history_unique (const char* line)
{
        HIST_ENTRY*    last_entry = current_history ();
        if (!strlen (line))
                return;
        if (!last_entry || strcmp (last_entry->line, line))
                add_history ((char*) line);
}

/* Prints command history, to be used before aborting */
static void
_dump_history ()
{
        int             i = 0;
        HIST_ENTRY**    all_entries = history_list ();

        fputs (_("\nCommand History:\n"), stdout);
        while (all_entries[i]) {
                puts(all_entries[i++]->line);
        }
}

#else

/* Print nothing because Readline is absent. */
static inline void
_dump_history (void)
{
}

#endif /* HAVE_LIBREADLINE */

static void
mask_signal()
{
        sigset_t    curr;
        sigset_t    prev;

        sigfillset(&curr);
        sigprocmask(SIG_SETMASK, &curr, &prev);
}

/* Resets the environment by jumping to the initial state
 * saved during ui intitialisation.
 * Pass 1 as the parameter if you want to quit parted,
 * 0 if you just want to reset to the command prompt.
 */
static void
reset_env (int quit)
{
        int    in_readline = readline_state.in_readline;

        readline_state.in_readline = 0;

        if (in_readline) {
                putchar ('\n');
                if (quit)
                        exit (0);

                siglongjmp (readline_state.jmp_state, 1);
        }
}

/* Signal handler for SIGINT using 'sigaction'. */
static void
sa_sigint_handler (int signum, siginfo_t* info, void *ucontext)
{
        if (info)
                sigaction (SIGINT, &sig_int, NULL);

        got_ctrl_c = 1;
        reset_env (0);
}

/* Signal handler for SIGINT using 'signal'. */
static void
s_sigint_handler (int signum)
{
        signal (SIGINT, &s_sigint_handler);
        mask_signal ();
        sa_sigint_handler (signum, NULL, NULL);
}

/* Signal handler for SIGSEGV using 'sigaction'. */
static void
sa_sigsegv_handler (int signum, siginfo_t* info, void* ucontext)
{
        printf (bug_msg, VERSION);
        _dump_history ();

        if (!info)
                abort ();

        sigaction (SIGSEGV, &sig_segv, NULL);

        switch (info->si_code) {

                case SEGV_MAPERR:
                        fputs(_("\nError: SEGV_MAPERR (Address not mapped "
                                "to object)\n"), stdout);
                        PED_ASSERT(0, break); /* Force a backtrace */
                        break;

                case SEGV_ACCERR:
                        fputs(_("\nError: SEGV_ACCERR (Invalid permissions "
                                "for mapped object)\n"), stdout);
                        break;

                default:
                        fputs(_("\nError: A general SIGSEGV signal was "
                                "encountered.\n"), stdout);
                        PED_ASSERT(0, break); /* Force a backtrace */
                        break;
        }

        abort ();
}

/* Signal handler for SIGSEGV using 'signal'. */
static void
s_sigsegv_handler (int signum)
{
        signal (SIGSEGV, &s_sigsegv_handler);
        mask_signal ();
        sa_sigsegv_handler (signum, NULL, NULL);
}

/* Signal handler for SIGFPE using 'sigaction'. */
static void
sa_sigfpe_handler (int signum, siginfo_t* info, void* ucontext)
{
        printf (bug_msg, VERSION);
        _dump_history ();

        if (!info)
                abort ();

        sigaction (SIGFPE, &sig_fpe, NULL);

        switch (info->si_code) {

                case FPE_INTDIV:
                        fputs(_("\nError: FPE_INTDIV (Integer: "
                                "divide by zero)"), stdout);
                        break;

                case FPE_INTOVF:
                        fputs(_("\nError: FPE_INTOVF (Integer: "
                                "overflow)"), stdout);
                        break;

                case FPE_FLTDIV:
                        fputs(_("\nError: FPE_FLTDIV (Float: "
                                "divide by zero)"), stdout);
                        break;

                case FPE_FLTOVF:
                        fputs(_("\nError: FPE_FLTOVF (Float: "
                                "overflow)"), stdout);
                        break;

                case FPE_FLTUND:
                        fputs(_("\nError: FPE_FLTUND (Float: "
                                "underflow)"), stdout);
                        break;

                case FPE_FLTRES:
                        fputs(_("\nError: FPE_FLTRES (Float: "
                                "inexact result)"), stdout);
                        break;

                case FPE_FLTINV:
                        fputs(_("\nError: FPE_FLTINV (Float: "
                                "invalid operation)"), stdout);
                        break;

                case FPE_FLTSUB:
                        fputs(_("\nError: FPE_FLTSUB (Float: "
                                "subscript out of range)"), stdout);
                        break;

                default:
                        fputs(_("\nError: A general SIGFPE signal "
                                "was encountered."), stdout);
                        break;

        }

        abort ();
}

/* Signal handler for SIGFPE using 'signal'. */
static void
s_sigfpe_handler (int signum)
{
        signal (SIGFPE, &s_sigfpe_handler);
        mask_signal ();
        sa_sigfpe_handler (signum, NULL, NULL);
}

/* Signal handler for SIGILL using 'sigaction'. */
static void
sa_sigill_handler (int signum, siginfo_t* info, void* ucontext)
{
        printf (bug_msg, VERSION);
        _dump_history ();

        if (!info)
                abort();

        sigaction (SIGILL, &sig_ill, NULL);

        switch (info->si_code) {

                case ILL_ILLOPC:
                        fputs(_("\nError: ILL_ILLOPC "
                                "(Illegal Opcode)"), stdout);
                        break;

                case ILL_ILLOPN:
                        fputs(_("\nError: ILL_ILLOPN "
                                "(Illegal Operand)"), stdout);
                        break;

                case ILL_ILLADR:
                        fputs(_("\nError: ILL_ILLADR "
                                "(Illegal addressing mode)"), stdout);
                        break;

                case ILL_ILLTRP:
                        fputs(_("\nError: ILL_ILLTRP "
                                "(Illegal Trap)"), stdout);
                        break;

                case ILL_PRVOPC:
                        fputs(_("\nError: ILL_PRVOPC "
                                "(Privileged Opcode)"), stdout);
                        break;

                case ILL_PRVREG:
                        fputs(_("\nError: ILL_PRVREG "
                                "(Privileged Register)"), stdout);
                        break;

                case ILL_COPROC:
                        fputs(_("\nError: ILL_COPROC "
                                "(Coprocessor Error)"), stdout);
                        break;

                case ILL_BADSTK:
                        fputs(_("\nError: ILL_BADSTK "
                                "(Internal Stack Error)"), stdout);
                        break;

                default:
                        fputs(_("\nError: A general SIGILL "
                                "signal was encountered."), stdout);
                        break;
        }

        abort ();
}

/* Signal handler for SIGILL using 'signal'. */
static void
s_sigill_handler (int signum)
{
        signal (SIGILL, &s_sigill_handler);
        mask_signal ();
        sa_sigill_handler (signum, NULL, NULL);
}

static char*
_readline (const char* prompt, const StrList* possibilities)
{
        char*    line;

        readline_state.possibilities = possibilities;
        readline_state.cur_pos = NULL;
        readline_state.in_readline = 1;

        if (sigsetjmp (readline_state.jmp_state,1))
                return NULL;

        wipe_line ();
#ifdef HAVE_LIBREADLINE
        if (!opt_script_mode) {
                /* XXX: why isn't prompt const? */
                line = readline ((char*) prompt);
                if (line)
                        _add_history_unique (line);
        } else
#endif
        {
                fputs (prompt, stdout);
                fflush (stdout);
                line = (char*) malloc (256);
                if (fgets (line, 256, stdin) && strcmp (line, "") != 0) {
#ifndef HAVE_LIBREADLINE
                        /* Echo the input line, to be consistent with
                           how readline-5.2 works.  */
                        fputs (line, stdout);
                        fflush (stdout);
#endif
                        line [strlen (line) - 1] = 0;    /* kill trailing CR */
                } else {
                        free (line);
                        line = NULL;
                }
        }

        readline_state.in_readline = 0;
        return line;
}

static PedExceptionOption
option_get_next (PedExceptionOption options, PedExceptionOption current)
{
        PedExceptionOption    i;

        if (current == 0)
                i = PED_EXCEPTION_OPTION_FIRST;
        else
                i = current * 2;

        for (; i <= options; i *= 2) {
                if (options & i)
                        return i;
        }
        return 0;
}

static void
_print_exception_text (PedException* ex)
{
        StrList*    text;

        wipe_line ();

        if (ex->type == PED_EXCEPTION_BUG) {
                printf (bug_msg, VERSION);
                text = str_list_create ("\n", ex->message, "\n\n", NULL);
        } else {
                text = str_list_create (
                           _(ped_exception_get_type_string (ex->type)),
                           ": ", ex->message, "\n", NULL);
        }

        str_list_print_wrap (text, screen_width (), 0, 0);
        str_list_destroy (text);
}

static PedExceptionOption
exception_handler (PedException* ex)
{
        PedExceptionOption    opt;

        _print_exception_text (ex);

        /* only one choice?  Take it ;-) */
        opt = option_get_next (ex->options, 0);
        if (!option_get_next (ex->options, opt))
                return opt;

        /* script-mode: don't handle the exception */
        if (opt_script_mode || (!isatty (0) && !pretend_input_tty))
                return PED_EXCEPTION_UNHANDLED;

        got_ctrl_c = 0;

        do {
                opt = command_line_get_ex_opt ("", ex->options);
        } while (opt == PED_EXCEPTION_UNHANDLED
                 && (isatty (0) || pretend_input_tty) && !got_ctrl_c);

        if (got_ctrl_c) {
                got_ctrl_c = 0;
                opt = PED_EXCEPTION_UNHANDLED;
        }

        return opt;
}

void
command_line_push_word (const char* word)
{
        command_line = str_list_append (command_line, word);
}

char*
command_line_pop_word ()
{
        char*       result;
        StrList*    next;

        PED_ASSERT (command_line != NULL, return NULL);

        result = str_list_convert_node (command_line);
        next = command_line->next;

        str_list_destroy_node (command_line);
        command_line = next;
        return result;
}

void
command_line_flush ()
{
        str_list_destroy (command_line);
        command_line = NULL;
}

char*
command_line_peek_word ()
{
        if (command_line)
                return str_list_convert_node (command_line);
        else
                return NULL;
}

int
command_line_get_word_count ()
{
        return str_list_length (command_line);
}

static int
_str_is_spaces (const char* str)
{
        while (isspace (*str))
                str++;

        return *str == 0;
}

/* "multi_word mode" is the "normal" mode... many words can be typed,
 * delimited by spaces, etc.
 *         In single-word mode, only one word is parsed per line.
 * Leading and trailing spaces are removed.  For example: " a b c "
 * is a single word "a b c".  The motivation for this mode is partition
 * names, etc.  In single-word mode, the empty string is a word.
 * (but not in multi-word mode).
 */
void
command_line_push_line (const char* line, int multi_word)
{
        int     quoted = 0;
        char    quote_char = 0;
        char    this_word [256];
        int     i;

        do {
                while (*line == ' ')
                        line++;

                i = 0;
                for (; *line; line++) {
                        if (*line == ' ' && !quoted) {
                                if (multi_word)
                                        break;

                        /* single word: check for trailing spaces + eol */
                                if (_str_is_spaces (line))
                                        break;
                        }

                        if (!quoted && strchr ("'\"", *line)) {
                                quoted = 1;
                                quote_char = *line;
                                continue;
                        }

                        if (quoted && *line == quote_char) {
                                quoted = 0;
                                continue;
                        }

                        /* hack: escape characters */
                        if (quoted && line[0] == '\\' && line[1])
                                line++;

                        this_word [i++] = *line;
                }
                if (i || !multi_word) {
                        this_word [i] = 0;
                        command_line_push_word (this_word);
                }
        } while (*line && multi_word);
}

static char*
realloc_and_cat (char* str, const char* append)
{
        int      length = strlen (str) + strlen (append) + 1;
        char*    new_str = realloc (str, length);

        strcat (new_str, append);
        return new_str;
}

static char*
_construct_prompt (const char* head, const char* def,
                   const StrList* possibilities)
{
        char*    prompt = strdup (head);

        if (def && possibilities)
                PED_ASSERT (str_list_match_any (possibilities, def),
                            return NULL);

        if (possibilities && str_list_length (possibilities) < 8) {
                const StrList*    walk;

                if (strlen (prompt))
                        prompt = realloc_and_cat (prompt, "  ");

                for (walk = possibilities; walk; walk = walk->next) {
                        if (walk != possibilities)
                                prompt = realloc_and_cat (prompt, "/");

                        if (def && str_list_match_node (walk, def) == 2) {
                                prompt = realloc_and_cat (prompt, "[");
                                prompt = realloc_and_cat (prompt, def);
                                prompt = realloc_and_cat (prompt, "]");
                        } else {
                                char*    text = str_list_convert_node (walk);
                                prompt = realloc_and_cat (prompt, text);
                                free (text);
                        }
                }
                prompt = realloc_and_cat (prompt, "? ");
        } else if (def) {
                if (strlen (prompt))
                        prompt = realloc_and_cat (prompt, "  ");
                prompt = realloc_and_cat (prompt, "[");
                prompt = realloc_and_cat (prompt, def);
                prompt = realloc_and_cat (prompt, "]? ");
        } else {
                if (strlen (prompt))
                        prompt = realloc_and_cat (prompt, " ");
        }

        return prompt;
}

void
command_line_prompt_words (const char* prompt, const char* def,
                           const StrList* possibilities, int multi_word)
{
        char*    line;
        char*    real_prompt;
        char*    _def = (char*) def;
        int      _def_needs_free = 0;

        if (!def && str_list_length (possibilities) == 1) {
                _def = str_list_convert_node (possibilities);
                _def_needs_free = 1;
        }

        if (opt_script_mode) {
                if (_def)
                        command_line_push_line (_def, 0);
                return;
        }

        do {
                real_prompt = _construct_prompt (prompt, _def, possibilities);
                line = _readline (real_prompt, possibilities);
                free (real_prompt);
                if (!line)
                        break;

                if (!strlen (line)) {
                        if (_def)
                                command_line_push_line (_def, 0);
                } else {
                        command_line_push_line (line, multi_word);
                }
                free (line);
        } while (!command_line_get_word_count () && !_def);

        if (_def_needs_free)
                free (_def);
}

/**
 * Get a word from command line.
 *
 * \param possibilities a StrList of valid strings, NULL if all are valid.
 * \param multi_word whether multiple words are allowed.
 *
 * \return The word(s), or NULL if empty.
 */
char*
command_line_get_word (const char* prompt, const char* def,
                       const StrList* possibilities, int multi_word)
{
        do {
                if (command_line_get_word_count ()) {
                        char*       result = command_line_pop_word ();
                        StrList*    result_node;

                        if (!possibilities)
                                return result;

                        result_node = str_list_match (possibilities, result);
                        if (result_node == NULL)
                                error (0, 0, _("invalid token: %s"), result);
                        free (result);
                        if (result_node)
                                return str_list_convert_node (result_node);

                        command_line_flush ();
                        if (opt_script_mode)
                                return NULL;
                }

                command_line_prompt_words (prompt, def, possibilities,
                                           multi_word);
        } while (command_line_get_word_count ());

        return NULL;
}

int
command_line_get_integer (const char* prompt, int* value)
{
        char     def_str [10];
        char*    input;
        int      valid;

        snprintf (def_str, 10, "%d", *value);
        input = command_line_get_word (prompt, *value ? def_str : NULL,
                                       NULL, 1);
        if (!input)
                return 0;
        valid = sscanf (input, "%d", value);
        free (input);
        return valid;
}

int
command_line_get_sector (const char* prompt, PedDevice* dev, PedSector* value,
                         PedGeometry** range)
{
        char*    def_str;
        char*    input;
        int      valid;

        def_str = ped_unit_format (dev, *value);
        input = command_line_get_word (prompt, *value ? def_str : NULL,
                                       NULL, 1);

        /* def_str might have rounded *value a little bit.  If the user picked
         * the default, make sure the selected sector is identical to the
         * default.
         */
        if (input && *value && !strcmp (input, def_str)) {
                if (range) {
                        *range = ped_geometry_new (dev, *value, 1);
                        ped_free (def_str);
                        return *range != NULL;
                }

                ped_free (def_str);
                return 1;
        }

        ped_free (def_str);
        if (!input) {
                *value = 0;
                if (range)
                        *range = NULL;
                return 0;
        }

        valid = ped_unit_parse (input, dev, value, range);

        free (input);
        return valid;
}

int
command_line_get_state (const char* prompt, int* value)
{
        char*    def_word;
        char*    input;

        if (*value)
                def_word = str_list_convert_node (on_list);
        else
                def_word = str_list_convert_node (off_list);
        input = command_line_get_word (prompt, def_word, on_off_list, 1);
        free (def_word);
        if (!input)
                return 0;
        if (str_list_match_any (on_list, input))
                *value = 1;
        else
                *value = 0;
        free (input);
        return 1;
}

int
command_line_get_device (const char* prompt, PedDevice** value)
{
        char*         def_dev_name = *value ? (*value)->path : NULL;
        char*         dev_name;
        PedDevice*    dev;

        dev_name = command_line_get_word (prompt, def_dev_name, NULL, 1);
        if (!dev_name)
                return 0;

        dev = ped_device_get (dev_name);
        free (dev_name);
        if (!dev)
                return 0;

        *value = dev;
        return 1;
}

int
command_line_get_disk (const char* prompt, PedDisk** value)
{
        PedDevice*    dev = *value ? (*value)->dev : NULL;

        if (!command_line_get_device (prompt, &dev))
                return 0;

        if (dev != (*value)->dev) {
                PedDisk*    new_disk = ped_disk_new (dev);
                if (!new_disk)
                        return 0;
                *value = new_disk;
        }
        return 1;
}

int
command_line_get_partition (const char* prompt, PedDisk* disk,
                            PedPartition** value)
{
        PedPartition*    part;

        /* Flawed logic, doesn't seem to work?!
        check = ped_disk_next_partition (disk, part);
        part  = ped_disk_next_partition (disk, check);

        if (part == NULL) {

        *value = check;
        printf (_("The (only) primary partition has "
                  "been automatically selected\n"));
        return 1;

        } else {
        */
        int num = (*value) ? (*value)->num : 0;

        if (!command_line_get_integer (prompt, &num)) {
                ped_exception_throw (PED_EXCEPTION_ERROR,
                                     PED_EXCEPTION_CANCEL,
                                     _("Expecting a partition number."));
                return 0;
        }

        part = ped_disk_get_partition (disk, num);

        if (!part) {
                ped_exception_throw (PED_EXCEPTION_ERROR,
                                     PED_EXCEPTION_CANCEL,
                                     _("Partition doesn't exist."));
            return 0;
        }

        *value = part;
        return 1;
        //}
}

int
command_line_get_fs_type (const char* prompt, const PedFileSystemType*(* value))
{
        char*                 fs_type_name;
        PedFileSystemType*    fs_type;

        fs_type_name = command_line_get_word (prompt,
                                              *value ? (*value)->name : NULL,
                                                     fs_type_list, 1);
        if (!fs_type_name) {
                ped_exception_throw (PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                                     _("Expecting a file system type."));
                return 0;
        }

        fs_type = ped_file_system_type_get (fs_type_name);
        if (!fs_type) {
                ped_exception_throw (PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                                     _("Unknown file system type \"%s\"."),
                                     fs_type_name);
                return 0;
        }

        free (fs_type_name);
        *value = fs_type;
        return 1;
}

int
command_line_get_disk_type (const char* prompt, const PedDiskType*(* value))
{
        char*    disk_type_name;

        disk_type_name = command_line_get_word (prompt,
                                                *value ? (*value)->name : NULL,
                                                disk_type_list, 1);
        if (!disk_type_name) {
                ped_exception_throw (PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                                     _("Expecting a disk label type."));
                return 0;
        }

        *value = ped_disk_type_get (disk_type_name);
        free (disk_type_name);
        PED_ASSERT (*value != NULL, return 0);
        return 1;
}

int
command_line_get_part_flag (const char* prompt, const PedPartition* part,
                            PedPartitionFlag* flag)
{
        StrList*            opts = NULL;
        PedPartitionFlag    walk = 0;
        char*               flag_name;

        while ( (walk = ped_partition_flag_next (walk)) ) {
                if (ped_partition_is_flag_available (part, walk)) {
                        const char*        walk_name;

                        walk_name = ped_partition_flag_get_name (walk);
                        opts = str_list_append (opts, walk_name);
                        opts = str_list_append_unique (opts, _(walk_name));
                }
        }

        flag_name = command_line_get_word (prompt, NULL, opts, 1);
        str_list_destroy (opts);

        if (flag_name) {
                *flag = ped_partition_flag_get_by_name (flag_name);
                ped_free (flag_name);
                return 1;
        } else
                return 0;
}

static int
_can_create_primary (const PedDisk* disk)
{
        int    i;

        for (i = 1; i <= ped_disk_get_max_primary_partition_count (disk); i++) {
                if (!ped_disk_get_partition (disk, i))
                        return 1;
        }

        return 0;
}

static int
_can_create_extended (const PedDisk* disk)
{
        if (!_can_create_primary (disk))
                return 0;

        if (!ped_disk_type_check_feature (disk->type, PED_DISK_TYPE_EXTENDED))
                return 0;

        if (ped_disk_extended_partition (disk))
                return 0;

        return 1;
}

static int
_can_create_logical (const PedDisk* disk)
{
        if (!ped_disk_type_check_feature (disk->type, PED_DISK_TYPE_EXTENDED))
                return 0;

        return ped_disk_extended_partition (disk) != 0;
}

int
command_line_get_part_type (const char* prompt, const PedDisk* disk,
                                   PedPartitionType* type)
{
        StrList*    opts = NULL;
        char*       type_name;

        if (_can_create_primary (disk)) {
                opts = str_list_append_unique (opts, "primary");
                opts = str_list_append_unique (opts, _("primary"));
        }
        if (_can_create_extended (disk)) {
                opts = str_list_append_unique (opts, "extended");
                opts = str_list_append_unique (opts, _("extended"));
        }
        if (_can_create_logical (disk)) {
                opts = str_list_append_unique (opts, "logical");
                opts = str_list_append_unique (opts, _("logical"));
        }
        if (!opts) {
                ped_exception_throw (
                        PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                        _("Can't create any more partitions."));
                return 0;
        }

        type_name = command_line_get_word (prompt, NULL, opts, 1);
        str_list_destroy (opts);

        if (!type_name) {
                ped_exception_throw (
                        PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                        _("Expecting a partition type."));
                return 0;
        }

        if (!strcmp (type_name, "primary")
                        || !strcmp (type_name, _("primary"))) {
                *type = 0;
        }
        if (!strcmp (type_name, "extended")
                        || !strcmp (type_name, _("extended"))) {
                *type = PED_PARTITION_EXTENDED;
        }
        if (!strcmp (type_name, "logical")
                        || !strcmp (type_name, _("logical"))) {
                *type = PED_PARTITION_LOGICAL;
        }

        free (type_name);
        return 1;
}

PedExceptionOption
command_line_get_ex_opt (const char* prompt, PedExceptionOption options)
{
        StrList*              options_strlist = NULL;
        PedExceptionOption    opt;
        char*                 opt_name;

        for (opt = option_get_next (options, 0); opt;
             opt = option_get_next (options, opt)) {
                options_strlist = str_list_append_unique (options_strlist,
                                     _(ped_exception_get_option_string (opt)));
                options_strlist = str_list_append_unique (options_strlist,
                                     ped_exception_get_option_string (opt));
        }

        opt_name = command_line_get_word (prompt, NULL, options_strlist, 1);
        if (!opt_name)
                return PED_EXCEPTION_UNHANDLED;
        str_list_destroy (options_strlist);

        opt = PED_EXCEPTION_OPTION_FIRST;
        while (1) {
                if (strcmp (opt_name,
                            ped_exception_get_option_string (opt)) == 0)
                        break;
                if (strcmp (opt_name,
                            _(ped_exception_get_option_string (opt))) == 0)
                        break;
                opt = option_get_next (options, opt);
        }
        free (opt_name);
        return opt;
}

int
command_line_get_unit (const char* prompt, PedUnit* unit)
{
        StrList*       opts = NULL;
        PedUnit        walk;
        char*          unit_name;
        const char*    default_unit_name;

        for (walk = PED_UNIT_FIRST; walk <= PED_UNIT_LAST; walk++)
                opts = str_list_append (opts, ped_unit_get_name (walk));

        default_unit_name = ped_unit_get_name (ped_unit_get_default ());
        unit_name = command_line_get_word (prompt, default_unit_name, opts, 1);
        str_list_destroy (opts);

        if (unit_name) {
                *unit = ped_unit_get_by_name (unit_name);
                free (unit_name);
                return 1;
        } else
                return 0;
}

int
command_line_is_integer ()
{
        char*    word;
        int      is_integer;
        int      scratch;

        word = command_line_peek_word ();
        if (!word)
                return 0;

        is_integer = sscanf (word, "%d", &scratch);
        free (word);
        return is_integer;
}

static int
init_ex_opt_str ()
{
        int                   i;
        PedExceptionOption    opt;

        for (i = 0; (1 << i) <= PED_EXCEPTION_OPTION_LAST; i++) {
                opt = (1 << i);
                ex_opt_str [i]
                        = str_list_create (
                                ped_exception_get_option_string (opt),
                                _(ped_exception_get_option_string (opt)),
                                NULL);
                if (!ex_opt_str [i])
                        return 0;
        }

        ex_opt_str [i] = NULL;
        return 1;
}

static void
done_ex_opt_str ()
{
        int    i;

        for (i=0; ex_opt_str [i]; i++)
                str_list_destroy (ex_opt_str [i]);
}

static int
init_state_str ()
{
        on_list = str_list_create_unique (_("on"), "on", NULL);
        off_list = str_list_create_unique (_("off"), "off", NULL);
        on_off_list = str_list_join (str_list_duplicate (on_list),
                                     str_list_duplicate (off_list));
        return 1;
}

static void
done_state_str ()
{
        str_list_destroy (on_list);
        str_list_destroy (off_list);
        str_list_destroy (on_off_list);
}

static int
init_fs_type_str ()
{
        PedFileSystemType*    walk;

        fs_type_list = NULL;

        for (walk = ped_file_system_type_get_next (NULL); walk;
             walk = ped_file_system_type_get_next (walk))
        {
                fs_type_list = str_list_insert (fs_type_list, walk->name);
                if (!fs_type_list)
                        return 0;
        }

        return 1;
}

static int
init_disk_type_str ()
{
        PedDiskType*    walk;

        disk_type_list = NULL;

        for (walk = ped_disk_type_get_next (NULL); walk;
             walk = ped_disk_type_get_next (walk))
        {
                disk_type_list = str_list_insert (disk_type_list, walk->name);
                if (!disk_type_list)
                        return 0;
        }

        return 1;
}

int
init_ui ()
{
        if (!init_ex_opt_str ()
            || !init_state_str ()
            || !init_fs_type_str ()
            || !init_disk_type_str ())
                return 0;
        ped_exception_set_handler (exception_handler);

#ifdef HAVE_LIBREADLINE
        rl_initialize ();
        rl_attempted_completion_function = (CPPFunction*) complete_function;
        readline_state.in_readline = 0;
#endif

#ifdef SA_SIGINFO
        sigset_t curr;
        sigfillset (&curr);

        sig_segv.sa_sigaction = &sa_sigsegv_handler;
        sig_int.sa_sigaction = &sa_sigint_handler;
        sig_fpe.sa_sigaction = &sa_sigfpe_handler;
        sig_ill.sa_sigaction = &sa_sigill_handler;

        sig_segv.sa_mask =
                sig_int.sa_mask =
                        sig_fpe.sa_mask =
                                sig_ill.sa_mask = curr;

        sig_segv.sa_flags =
                sig_int.sa_flags =
                        sig_fpe.sa_flags =
                                sig_ill.sa_flags = SA_SIGINFO;

        sigaction (SIGSEGV, &sig_segv, NULL);
        sigaction (SIGINT, &sig_int, NULL);
        sigaction (SIGFPE, &sig_fpe, NULL);
        sigaction (SIGILL, &sig_ill, NULL);
#else
        signal (SIGSEGV, s_sigsegv_handler);
        signal (SIGINT, s_sigint_handler);
        signal (SIGFPE, s_sigfpe_handler);
        signal (SIGILL, s_sigill_handler);
#endif /* SA_SIGINFO */

        return 1;
}

void
done_ui ()
{
        ped_exception_set_handler (NULL);
        done_ex_opt_str ();
        done_state_str ();
        str_list_destroy (fs_type_list);
        str_list_destroy (disk_type_list);
}

void
help_msg ()
{
        fputs (_(usage_msg), stdout);

        putchar ('\n');
        fputs (_("OPTIONs:"), stdout);
        putchar ('\n');
        print_options_help ();

        putchar ('\n');
        fputs (_("COMMANDs:"), stdout);
        putchar ('\n');
        print_commands_help ();
        exit (0);
}

void
print_using_dev (PedDevice* dev)
{
        printf (_("Using %s\n"), dev->path);
}

int
interactive_mode (PedDevice** dev, Command* cmd_list[])
{
        StrList*    list;
        StrList*    command_names = command_get_names (cmd_list);

        commands = cmd_list;    /* FIXME yucky, nasty, evil hack */

        fputs (prog_name, stdout);

        print_using_dev (*dev);

        list = str_list_create (_(banner_msg), NULL);
        str_list_print_wrap (list, screen_width (), 0, 0);
        str_list_destroy (list);

        while (1) {
                char*       word;
                Command*    cmd;

                while (!command_line_get_word_count ()) {
                        if (feof (stdin)) {
                                putchar ('\n');
                                return 1;
                        }
                        command_line_prompt_words ("(parted)", NULL,
                                                   command_names, 1);
                }

                word = command_line_pop_word ();
                if (word) {
                        cmd = command_get (commands, word);
                        free (word);
                        if (cmd) {
                                if (!command_run (cmd, dev))
                                        command_line_flush ();
                        } else
                                print_commands_help ();
                }
        }

        return 1;
}


int
non_interactive_mode (PedDevice** dev, Command* cmd_list[],
                      int argc, char* argv[])
{
        int         i;
        Command*    cmd;

        commands = cmd_list;    /* FIXME yucky, nasty, evil hack */

        for (i = 0; i < argc; i++)
                command_line_push_line (argv [i], 1);

        while (command_line_get_word_count ()) {
                char*    word;

                word = command_line_pop_word ();
                if (!word)
                        break;

                cmd = command_get (commands, word);
                free (word);
                if (!cmd) {
                        help_msg ();
                        goto error;
                }
                if (!(cmd->non_interactive)) {
                        fputs(_("This command does not make sense in "
                                "non-interactive mode.\n"), stdout);
                        exit(1);
                        goto error;
                }

                if (!command_run (cmd, dev))
                        goto error;
        }
        return 1;

error:
        return 0;
}