scripts/kconfig/lxdialog/util.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
set_mono_theme
set_classic_theme
set_blackbg_theme
set_bluetitle_theme
set_theme
init_one_color
init_dialog_colors
color_setup
attr_clear
dialog_clear
init_dialog
set_dialog_backtitle
set_dialog_subtitles
end_dialog
print_title
print_autowrap
print_button
draw_box
draw_shadow
first_alpha
on_key_esc
on_key_resize
item_reset
item_make
item_add_str
item_set_tag
item_set_data
item_set_selected
item_activate_selected
item_data
item_tag
item_count
item_set
item_n
item_str
item_is_selected
item_is_tag
/*
 *  util.c
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdarg.h>

#include "dialog.h"

/* Needed in signal handler in mconf.c */
int saved_x, saved_y;

struct dialog_info dlg;

static void set_mono_theme(void)
{
        dlg.screen.atr = A_NORMAL;
        dlg.shadow.atr = A_NORMAL;
        dlg.dialog.atr = A_NORMAL;
        dlg.title.atr = A_BOLD;
        dlg.border.atr = A_NORMAL;
        dlg.button_active.atr = A_REVERSE;
        dlg.button_inactive.atr = A_DIM;
        dlg.button_key_active.atr = A_REVERSE;
        dlg.button_key_inactive.atr = A_BOLD;
        dlg.button_label_active.atr = A_REVERSE;
        dlg.button_label_inactive.atr = A_NORMAL;
        dlg.inputbox.atr = A_NORMAL;
        dlg.inputbox_border.atr = A_NORMAL;
        dlg.searchbox.atr = A_NORMAL;
        dlg.searchbox_title.atr = A_BOLD;
        dlg.searchbox_border.atr = A_NORMAL;
        dlg.position_indicator.atr = A_BOLD;
        dlg.menubox.atr = A_NORMAL;
        dlg.menubox_border.atr = A_NORMAL;
        dlg.item.atr = A_NORMAL;
        dlg.item_selected.atr = A_REVERSE;
        dlg.tag.atr = A_BOLD;
        dlg.tag_selected.atr = A_REVERSE;
        dlg.tag_key.atr = A_BOLD;
        dlg.tag_key_selected.atr = A_REVERSE;
        dlg.check.atr = A_BOLD;
        dlg.check_selected.atr = A_REVERSE;
        dlg.uarrow.atr = A_BOLD;
        dlg.darrow.atr = A_BOLD;
}

#define DLG_COLOR(dialog, f, b, h) \
do {                               \
        dlg.dialog.fg = (f);       \
        dlg.dialog.bg = (b);       \
        dlg.dialog.hl = (h);       \
} while (0)

static void set_classic_theme(void)
{
        DLG_COLOR(screen,                COLOR_CYAN,   COLOR_BLUE,   true);
        DLG_COLOR(shadow,                COLOR_BLACK,  COLOR_BLACK,  true);
        DLG_COLOR(dialog,                COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(title,                 COLOR_YELLOW, COLOR_WHITE,  true);
        DLG_COLOR(border,                COLOR_WHITE,  COLOR_WHITE,  true);
        DLG_COLOR(button_active,         COLOR_WHITE,  COLOR_BLUE,   true);
        DLG_COLOR(button_inactive,       COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(button_key_active,     COLOR_WHITE,  COLOR_BLUE,   true);
        DLG_COLOR(button_key_inactive,   COLOR_RED,    COLOR_WHITE,  false);
        DLG_COLOR(button_label_active,   COLOR_YELLOW, COLOR_BLUE,   true);
        DLG_COLOR(button_label_inactive, COLOR_BLACK,  COLOR_WHITE,  true);
        DLG_COLOR(inputbox,              COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(inputbox_border,       COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(searchbox,             COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(searchbox_title,       COLOR_YELLOW, COLOR_WHITE,  true);
        DLG_COLOR(searchbox_border,      COLOR_WHITE,  COLOR_WHITE,  true);
        DLG_COLOR(position_indicator,    COLOR_YELLOW, COLOR_WHITE,  true);
        DLG_COLOR(menubox,               COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(menubox_border,        COLOR_WHITE,  COLOR_WHITE,  true);
        DLG_COLOR(item,                  COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(item_selected,         COLOR_WHITE,  COLOR_BLUE,   true);
        DLG_COLOR(tag,                   COLOR_YELLOW, COLOR_WHITE,  true);
        DLG_COLOR(tag_selected,          COLOR_YELLOW, COLOR_BLUE,   true);
        DLG_COLOR(tag_key,               COLOR_YELLOW, COLOR_WHITE,  true);
        DLG_COLOR(tag_key_selected,      COLOR_YELLOW, COLOR_BLUE,   true);
        DLG_COLOR(check,                 COLOR_BLACK,  COLOR_WHITE,  false);
        DLG_COLOR(check_selected,        COLOR_WHITE,  COLOR_BLUE,   true);
        DLG_COLOR(uarrow,                COLOR_GREEN,  COLOR_WHITE,  true);
        DLG_COLOR(darrow,                COLOR_GREEN,  COLOR_WHITE,  true);
}

static void set_blackbg_theme(void)
{
        DLG_COLOR(screen, COLOR_RED,   COLOR_BLACK, true);
        DLG_COLOR(shadow, COLOR_BLACK, COLOR_BLACK, false);
        DLG_COLOR(dialog, COLOR_WHITE, COLOR_BLACK, false);
        DLG_COLOR(title,  COLOR_RED,   COLOR_BLACK, false);
        DLG_COLOR(border, COLOR_BLACK, COLOR_BLACK, true);

        DLG_COLOR(button_active,         COLOR_YELLOW, COLOR_RED,   false);
        DLG_COLOR(button_inactive,       COLOR_YELLOW, COLOR_BLACK, false);
        DLG_COLOR(button_key_active,     COLOR_YELLOW, COLOR_RED,   true);
        DLG_COLOR(button_key_inactive,   COLOR_RED,    COLOR_BLACK, false);
        DLG_COLOR(button_label_active,   COLOR_WHITE,  COLOR_RED,   false);
        DLG_COLOR(button_label_inactive, COLOR_BLACK,  COLOR_BLACK, true);

        DLG_COLOR(inputbox,         COLOR_YELLOW, COLOR_BLACK, false);
        DLG_COLOR(inputbox_border,  COLOR_YELLOW, COLOR_BLACK, false);

        DLG_COLOR(searchbox,        COLOR_YELLOW, COLOR_BLACK, false);
        DLG_COLOR(searchbox_title,  COLOR_YELLOW, COLOR_BLACK, true);
        DLG_COLOR(searchbox_border, COLOR_BLACK,  COLOR_BLACK, true);

        DLG_COLOR(position_indicator, COLOR_RED, COLOR_BLACK,  false);

        DLG_COLOR(menubox,          COLOR_YELLOW, COLOR_BLACK, false);
        DLG_COLOR(menubox_border,   COLOR_BLACK,  COLOR_BLACK, true);

        DLG_COLOR(item,             COLOR_WHITE, COLOR_BLACK, false);
        DLG_COLOR(item_selected,    COLOR_WHITE, COLOR_RED,   false);

        DLG_COLOR(tag,              COLOR_RED,    COLOR_BLACK, false);
        DLG_COLOR(tag_selected,     COLOR_YELLOW, COLOR_RED,   true);
        DLG_COLOR(tag_key,          COLOR_RED,    COLOR_BLACK, false);
        DLG_COLOR(tag_key_selected, COLOR_YELLOW, COLOR_RED,   true);

        DLG_COLOR(check,            COLOR_YELLOW, COLOR_BLACK, false);
        DLG_COLOR(check_selected,   COLOR_YELLOW, COLOR_RED,   true);

        DLG_COLOR(uarrow, COLOR_RED, COLOR_BLACK, false);
        DLG_COLOR(darrow, COLOR_RED, COLOR_BLACK, false);
}

static void set_bluetitle_theme(void)
{
        set_classic_theme();
        DLG_COLOR(title,               COLOR_BLUE,   COLOR_WHITE, true);
        DLG_COLOR(button_key_active,   COLOR_YELLOW, COLOR_BLUE,  true);
        DLG_COLOR(button_label_active, COLOR_WHITE,  COLOR_BLUE,  true);
        DLG_COLOR(searchbox_title,     COLOR_BLUE,   COLOR_WHITE, true);
        DLG_COLOR(position_indicator,  COLOR_BLUE,   COLOR_WHITE, true);
        DLG_COLOR(tag,                 COLOR_BLUE,   COLOR_WHITE, true);
        DLG_COLOR(tag_key,             COLOR_BLUE,   COLOR_WHITE, true);

}

/*
 * Select color theme
 */
static int set_theme(const char *theme)
{
        int use_color = 1;
        if (!theme)
                set_bluetitle_theme();
        else if (strcmp(theme, "classic") == 0)
                set_classic_theme();
        else if (strcmp(theme, "bluetitle") == 0)
                set_bluetitle_theme();
        else if (strcmp(theme, "blackbg") == 0)
                set_blackbg_theme();
        else if (strcmp(theme, "mono") == 0)
                use_color = 0;

        return use_color;
}

static void init_one_color(struct dialog_color *color)
{
        static int pair = 0;

        pair++;
        init_pair(pair, color->fg, color->bg);
        if (color->hl)
                color->atr = A_BOLD | COLOR_PAIR(pair);
        else
                color->atr = COLOR_PAIR(pair);
}

static void init_dialog_colors(void)
{
        init_one_color(&dlg.screen);
        init_one_color(&dlg.shadow);
        init_one_color(&dlg.dialog);
        init_one_color(&dlg.title);
        init_one_color(&dlg.border);
        init_one_color(&dlg.button_active);
        init_one_color(&dlg.button_inactive);
        init_one_color(&dlg.button_key_active);
        init_one_color(&dlg.button_key_inactive);
        init_one_color(&dlg.button_label_active);
        init_one_color(&dlg.button_label_inactive);
        init_one_color(&dlg.inputbox);
        init_one_color(&dlg.inputbox_border);
        init_one_color(&dlg.searchbox);
        init_one_color(&dlg.searchbox_title);
        init_one_color(&dlg.searchbox_border);
        init_one_color(&dlg.position_indicator);
        init_one_color(&dlg.menubox);
        init_one_color(&dlg.menubox_border);
        init_one_color(&dlg.item);
        init_one_color(&dlg.item_selected);
        init_one_color(&dlg.tag);
        init_one_color(&dlg.tag_selected);
        init_one_color(&dlg.tag_key);
        init_one_color(&dlg.tag_key_selected);
        init_one_color(&dlg.check);
        init_one_color(&dlg.check_selected);
        init_one_color(&dlg.uarrow);
        init_one_color(&dlg.darrow);
}

/*
 * Setup for color display
 */
static void color_setup(const char *theme)
{
        int use_color;

        use_color = set_theme(theme);
        if (use_color && has_colors()) {
                start_color();
                init_dialog_colors();
        } else
                set_mono_theme();
}

/*
 * Set window to attribute 'attr'
 */
void attr_clear(WINDOW * win, int height, int width, chtype attr)
{
        int i, j;

        wattrset(win, attr);
        for (i = 0; i < height; i++) {
                wmove(win, i, 0);
                for (j = 0; j < width; j++)
                        waddch(win, ' ');
        }
        touchwin(win);
}

void dialog_clear(void)
{
        int lines, columns;

        lines = getmaxy(stdscr);
        columns = getmaxx(stdscr);

        attr_clear(stdscr, lines, columns, dlg.screen.atr);
        /* Display background title if it exists ... - SLH */
        if (dlg.backtitle != NULL) {
                int i, len = 0, skip = 0;
                struct subtitle_list *pos;

                wattrset(stdscr, dlg.screen.atr);
                mvwaddstr(stdscr, 0, 1, (char *)dlg.backtitle);

                for (pos = dlg.subtitles; pos != NULL; pos = pos->next) {
                        /* 3 is for the arrow and spaces */
                        len += strlen(pos->text) + 3;
                }

                wmove(stdscr, 1, 1);
                if (len > columns - 2) {
                        const char *ellipsis = "[...] ";
                        waddstr(stdscr, ellipsis);
                        skip = len - (columns - 2 - strlen(ellipsis));
                }

                for (pos = dlg.subtitles; pos != NULL; pos = pos->next) {
                        if (skip == 0)
                                waddch(stdscr, ACS_RARROW);
                        else
                                skip--;

                        if (skip == 0)
                                waddch(stdscr, ' ');
                        else
                                skip--;

                        if (skip < strlen(pos->text)) {
                                waddstr(stdscr, pos->text + skip);
                                skip = 0;
                        } else
                                skip -= strlen(pos->text);

                        if (skip == 0)
                                waddch(stdscr, ' ');
                        else
                                skip--;
                }

                for (i = len + 1; i < columns - 1; i++)
                        waddch(stdscr, ACS_HLINE);
        }
        wnoutrefresh(stdscr);
}

/*
 * Do some initialization for dialog
 */
int init_dialog(const char *backtitle)
{
        int height, width;

        initscr();              /* Init curses */

        /* Get current cursor position for signal handler in mconf.c */
        getyx(stdscr, saved_y, saved_x);

        getmaxyx(stdscr, height, width);
        if (height < WINDOW_HEIGTH_MIN || width < WINDOW_WIDTH_MIN) {
                endwin();
                return -ERRDISPLAYTOOSMALL;
        }

        dlg.backtitle = backtitle;
        color_setup(getenv("MENUCONFIG_COLOR"));

        keypad(stdscr, TRUE);
        cbreak();
        noecho();
        dialog_clear();

        return 0;
}

void set_dialog_backtitle(const char *backtitle)
{
        dlg.backtitle = backtitle;
}

void set_dialog_subtitles(struct subtitle_list *subtitles)
{
        dlg.subtitles = subtitles;
}

/*
 * End using dialog functions.
 */
void end_dialog(int x, int y)
{
        /* move cursor back to original position */
        move(y, x);
        refresh();
        endwin();
}

/* Print the title of the dialog. Center the title and truncate
 * tile if wider than dialog (- 2 chars).
 **/
void print_title(WINDOW *dialog, const char *title, int width)
{
        if (title) {
                int tlen = MIN(width - 2, strlen(title));
                wattrset(dialog, dlg.title.atr);
                mvwaddch(dialog, 0, (width - tlen) / 2 - 1, ' ');
                mvwaddnstr(dialog, 0, (width - tlen)/2, title, tlen);
                waddch(dialog, ' ');
        }
}

/*
 * Print a string of text in a window, automatically wrap around to the
 * next line if the string is too long to fit on one line. Newline
 * characters '\n' are propperly processed.  We start on a new line
 * if there is no room for at least 4 nonblanks following a double-space.
 */
void print_autowrap(WINDOW * win, const char *prompt, int width, int y, int x)
{
        int newl, cur_x, cur_y;
        int prompt_len, room, wlen;
        char tempstr[MAX_LEN + 1], *word, *sp, *sp2, *newline_separator = 0;

        strcpy(tempstr, prompt);

        prompt_len = strlen(tempstr);

        if (prompt_len <= width - x * 2) {      /* If prompt is short */
                wmove(win, y, (width - prompt_len) / 2);
                waddstr(win, tempstr);
        } else {
                cur_x = x;
                cur_y = y;
                newl = 1;
                word = tempstr;
                while (word && *word) {
                        sp = strpbrk(word, "\n ");
                        if (sp && *sp == '\n')
                                newline_separator = sp;

                        if (sp)
                                *sp++ = 0;

                        /* Wrap to next line if either the word does not fit,
                           or it is the first word of a new sentence, and it is
                           short, and the next word does not fit. */
                        room = width - cur_x;
                        wlen = strlen(word);
                        if (wlen > room ||
                            (newl && wlen < 4 && sp
                             && wlen + 1 + strlen(sp) > room
                             && (!(sp2 = strpbrk(sp, "\n "))
                                 || wlen + 1 + (sp2 - sp) > room))) {
                                cur_y++;
                                cur_x = x;
                        }
                        wmove(win, cur_y, cur_x);
                        waddstr(win, word);
                        getyx(win, cur_y, cur_x);

                        /* Move to the next line if the word separator was a newline */
                        if (newline_separator) {
                                cur_y++;
                                cur_x = x;
                                newline_separator = 0;
                        } else
                                cur_x++;

                        if (sp && *sp == ' ') {
                                cur_x++;        /* double space */
                                while (*++sp == ' ') ;
                                newl = 1;
                        } else
                                newl = 0;
                        word = sp;
                }
        }
}

/*
 * Print a button
 */
void print_button(WINDOW * win, const char *label, int y, int x, int selected)
{
        int i, temp;

        wmove(win, y, x);
        wattrset(win, selected ? dlg.button_active.atr
                 : dlg.button_inactive.atr);
        waddstr(win, "<");
        temp = strspn(label, " ");
        label += temp;
        wattrset(win, selected ? dlg.button_label_active.atr
                 : dlg.button_label_inactive.atr);
        for (i = 0; i < temp; i++)
                waddch(win, ' ');
        wattrset(win, selected ? dlg.button_key_active.atr
                 : dlg.button_key_inactive.atr);
        waddch(win, label[0]);
        wattrset(win, selected ? dlg.button_label_active.atr
                 : dlg.button_label_inactive.atr);
        waddstr(win, (char *)label + 1);
        wattrset(win, selected ? dlg.button_active.atr
                 : dlg.button_inactive.atr);
        waddstr(win, ">");
        wmove(win, y, x + temp + 1);
}

/*
 * Draw a rectangular box with line drawing characters
 */
void
draw_box(WINDOW * win, int y, int x, int height, int width,
         chtype box, chtype border)
{
        int i, j;

        wattrset(win, 0);
        for (i = 0; i < height; i++) {
                wmove(win, y + i, x);
                for (j = 0; j < width; j++)
                        if (!i && !j)
                                waddch(win, border | ACS_ULCORNER);
                        else if (i == height - 1 && !j)
                                waddch(win, border | ACS_LLCORNER);
                        else if (!i && j == width - 1)
                                waddch(win, box | ACS_URCORNER);
                        else if (i == height - 1 && j == width - 1)
                                waddch(win, box | ACS_LRCORNER);
                        else if (!i)
                                waddch(win, border | ACS_HLINE);
                        else if (i == height - 1)
                                waddch(win, box | ACS_HLINE);
                        else if (!j)
                                waddch(win, border | ACS_VLINE);
                        else if (j == width - 1)
                                waddch(win, box | ACS_VLINE);
                        else
                                waddch(win, box | ' ');
        }
}

/*
 * Draw shadows along the right and bottom edge to give a more 3D look
 * to the boxes
 */
void draw_shadow(WINDOW * win, int y, int x, int height, int width)
{
        int i;

        if (has_colors()) {     /* Whether terminal supports color? */
                wattrset(win, dlg.shadow.atr);
                wmove(win, y + height, x + 2);
                for (i = 0; i < width; i++)
                        waddch(win, winch(win) & A_CHARTEXT);
                for (i = y + 1; i < y + height + 1; i++) {
                        wmove(win, i, x + width);
                        waddch(win, winch(win) & A_CHARTEXT);
                        waddch(win, winch(win) & A_CHARTEXT);
                }
                wnoutrefresh(win);
        }
}

/*
 *  Return the position of the first alphabetic character in a string.
 */
int first_alpha(const char *string, const char *exempt)
{
        int i, in_paren = 0, c;

        for (i = 0; i < strlen(string); i++) {
                c = tolower(string[i]);

                if (strchr("<[(", c))
                        ++in_paren;
                if (strchr(">])", c) && in_paren > 0)
                        --in_paren;

                if ((!in_paren) && isalpha(c) && strchr(exempt, c) == 0)
                        return i;
        }

        return 0;
}

/*
 * ncurses uses ESC to detect escaped char sequences. This resutl in
 * a small timeout before ESC is actually delivered to the application.
 * lxdialog suggest <ESC> <ESC> which is correctly translated to two
 * times esc. But then we need to ignore the second esc to avoid stepping
 * out one menu too much. Filter away all escaped key sequences since
 * keypad(FALSE) turn off ncurses support for escape sequences - and thats
 * needed to make notimeout() do as expected.
 */
int on_key_esc(WINDOW *win)
{
        int key;
        int key2;
        int key3;

        nodelay(win, TRUE);
        keypad(win, FALSE);
        key = wgetch(win);
        key2 = wgetch(win);
        do {
                key3 = wgetch(win);
        } while (key3 != ERR);
        nodelay(win, FALSE);
        keypad(win, TRUE);
        if (key == KEY_ESC && key2 == ERR)
                return KEY_ESC;
        else if (key != ERR && key != KEY_ESC && key2 == ERR)
                ungetch(key);

        return -1;
}

/* redraw screen in new size */
int on_key_resize(void)
{
        dialog_clear();
        return KEY_RESIZE;
}

struct dialog_list *item_cur;
struct dialog_list item_nil;
struct dialog_list *item_head;

void item_reset(void)
{
        struct dialog_list *p, *next;

        for (p = item_head; p; p = next) {
                next = p->next;
                free(p);
        }
        item_head = NULL;
        item_cur = &item_nil;
}

void item_make(const char *fmt, ...)
{
        va_list ap;
        struct dialog_list *p = malloc(sizeof(*p));

        if (item_head)
                item_cur->next = p;
        else
                item_head = p;
        item_cur = p;
        memset(p, 0, sizeof(*p));

        va_start(ap, fmt);
        vsnprintf(item_cur->node.str, sizeof(item_cur->node.str), fmt, ap);
        va_end(ap);
}

void item_add_str(const char *fmt, ...)
{
        va_list ap;
        size_t avail;

        avail = sizeof(item_cur->node.str) - strlen(item_cur->node.str);

        va_start(ap, fmt);
        vsnprintf(item_cur->node.str + strlen(item_cur->node.str),
                  avail, fmt, ap);
        item_cur->node.str[sizeof(item_cur->node.str) - 1] = '\0';
        va_end(ap);
}

void item_set_tag(char tag)
{
        item_cur->node.tag = tag;
}
void item_set_data(void *ptr)
{
        item_cur->node.data = ptr;
}

void item_set_selected(int val)
{
        item_cur->node.selected = val;
}

int item_activate_selected(void)
{
        item_foreach()
                if (item_is_selected())
                        return 1;
        return 0;
}

void *item_data(void)
{
        return item_cur->node.data;
}

char item_tag(void)
{
        return item_cur->node.tag;
}

int item_count(void)
{
        int n = 0;
        struct dialog_list *p;

        for (p = item_head; p; p = p->next)
                n++;
        return n;
}

void item_set(int n)
{
        int i = 0;
        item_foreach()
                if (i++ == n)
                        return;
}

int item_n(void)
{
        int n = 0;
        struct dialog_list *p;

        for (p = item_head; p; p = p->next) {
                if (p == item_cur)
                        return n;
                n++;
        }
        return 0;
}

const char *item_str(void)
{
        return item_cur->node.str;
}

int item_is_selected(void)
{
        return (item_cur->node.selected != 0);
}

int item_is_tag(char tag)
{
        return (item_cur->node.tag == tag);
}
/* [<][>][^][v][top][bottom][index][help] */
root/scripts/kconfig/lxdialog/util.c

DEFINITIONS
