path: root/gnu/lib/libdialog/kernel.c

/*
 *  dialog - Display simple dialog boxes from shell scripts
 *
 *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *
 *  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.
 *
 *
 *  HISTORY:
 *
 *  17/12/93 - Version 0.1 released.
 *
 *  19/12/93 - menu will now scroll if there are more items than can fit
 *             on the screen.
 *           - added 'checklist', a dialog box with a list of options that
 *             can be turned on or off. A list of options that are on is
 *             returned on exit.
 *
 *  20/12/93 - Version 0.15 released.
 *
 *  29/12/93 - Incorporated patch from Patrick J. Volkerding
 *             (volkerdi@mhd1.moorhead.msus.edu) that made these changes:
 *             - increased MAX_LEN to 2048
 *             - added 'infobox', equivalent to a message box without pausing
 *             - added option '--clear' that will clear the screen
 *             - Explicit line breaking when printing prompt text can be
 *               invoked by real newline '\n' besides the string "\n"
 *           - an optional parameter '--title <string>' can be used to
 *             specify a title string for the dialog box
 *
 *  03/01/94 - added 'textbox', a dialog box for displaying text from a file.
 *           - Version 0.2 released.
 *
 *  04/01/94 - some fixes and improvements for 'textbox':
 *             - fixed a bug that will cause a segmentation violation when a
 *               line is longer than MAX_LEN characters. Lines will now be
 *               truncated if they are longer than MAX_LEN characters.
 *             - removed wrefresh() from print_line(). This will increase
 *               efficiency of print_page() which calls print_line().
 *             - display current position in the form of percentage into file.
 *           - Version 0.21 released.
 *
 *  05/01/94 - some changes for faster screen update.
 *
 *  07/01/94 - much more flexible color settings. Can use all 16 colors
 *             (8 normal, 8 highlight) of the Linux console.
 *
 *  08/01/94 - added run-time configuration using configuration file.
 *
 *  09/01/94 - some minor bug fixes and cleanups for menubox, checklist and
 *             textbox.
 *
 *  11/01/94 - added a man page.
 *
 *  13/01/94 - some changes for easier porting to other Unix systems (tested
 *             on Ultrix, SunOS and HPUX)
 *           - Version 0.3 released.
 *
 *  08/06/94 - Patches by Stuart Herbert - S.Herbert@shef.ac.uk
 * 	       Fixed attr_clear and the textbox stuff to work with ncurses 1.8.5
 * 	       Fixed the wordwrap routine - it'll actually wrap properly now
 *	       Added a more 3D look to everything - having your own rc file could
 *	         prove 'interesting' to say the least :-)
 *             Added radiolist option
 *	     - Version 0.4 released.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#define __DIALOG_MAIN__

#include <dialog.h>
#include <err.h>
#include "dialog.priv.h"
#ifdef HAVE_NCURSES
#include "colors.h"
#endif

/* These are two "secret" globals that can be fiddled to make a dialog
 * come up someplace other than a "centered" calculation for X,Y
 */
int DialogX, DialogY;

/* This "secret" global allows you to change the behavior of an input field */
int DialogInputAttrs;

/*
 * Do some initialization for dialog
 */
void init_dialog(void)
{

  if (issetugid()) {
	errx(1, "libdialog is unsafe to use in setugid applications");
  }

#if defined(LOCALE)
  (void) setlocale(LC_ALL, "");
#endif

#ifdef HAVE_NCURSES
  if (parse_rc() == -1)    /* Read the configuration file */
    exit(-1);
#endif

  if (initscr() == NULL) { /* Init curses */
    fprintf(stderr, "\nCurses initialization error.\n");
    exit(-1);
  }
  keypad(stdscr, TRUE);
  cbreak();
  noecho();

#ifdef HAVE_NCURSES
  if (use_colors || use_shadow)    /* Set up colors */
    color_setup();
#endif

  /* Set screen to screen attribute */
  dialog_clear_norefresh();
  DialogX = DialogY = 0;
}
/* End of init_dialog() */


#ifdef HAVE_NCURSES
/*
 * Setup for color display
 */
void color_setup(void)
{
  int i;

  if (has_colors()) {    /* Terminal supports color? */
    start_color();

    /* Initialize color pairs */
    for (i = 0; i < ATTRIBUTE_COUNT; i++)
      init_pair(i+1, color_table[i][0], color_table[i][1]);

    /* Setup color attributes */
    for (i = 0; i < ATTRIBUTE_COUNT; i++)
      attributes[i] = C_ATTR(color_table[i][2], i+1);
  }
}
/* End of color_setup() */
#endif


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

  wattrset(win, attr);    /* Set window to attribute 'attr' */
  for (i = 0; i < height; i++) {
    wmove(win, i, 0);
    for (j = 0; j < width; j++)
      waddch(win, ' ');
  }
}
/* End of attr_clear() */


/*
 * 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. Note that the
 * string may contain "\n" to represent a newline character or the real
 * newline '\n', but in that case, auto wrap around will be disabled.
 */
void print_autowrap(WINDOW *win, unsigned char *prompt, int height, int width, int maxwidth, int y, int x, int center, int rawmode)
{
  int cur_x, cur_y, i;
  unsigned char tempstr[MAX_LEN+1], *word, *tempptr, *tempptr1;
  chtype ostuff[132], attrs = 0, init_bottom = 0;

  wsetscrreg(win, y, height);
  getyx(win, cur_y, cur_x);

  strncpy(tempstr, prompt, MAX_LEN);
  tempstr[MAX_LEN] = '\0';
  if ((!rawmode && strstr(tempstr, "\\n") != NULL) ||
      (strchr(tempstr, '\n') != NULL)) {    /* Prompt contains "\n" or '\n' */
    word = tempstr;
    while (1) {
      tempptr = rawmode ? NULL : strstr(word, "\\n");
      tempptr1 = strchr(word, '\n');
      if (tempptr == NULL && tempptr1 == NULL)
        break;
      else if (tempptr == NULL) {    /* No more "\n" */
        tempptr = tempptr1;
        tempptr[0] = '\0';
      }
      else if (tempptr1 == NULL) {    /* No more '\n' */
        tempptr[0] = '\0';
        tempptr++;
      }
      else {    /* Prompt contains both "\n" and '\n' */
        if (strlen(tempptr)-2 < strlen(tempptr1)-1) {
          tempptr = tempptr1;
          tempptr[0] = '\0';
        }
        else {
          tempptr[0] = '\0';
          tempptr++;
        }
      }

      waddstr(win, word);
      word = tempptr + 1;
      if (++cur_y > height) {
	cur_y--;
	if (!init_bottom) {
	  for (i = 0; i < x; i++)
	    ostuff[i] = mvwinch(win, cur_y, i);
	  for (i = width; i < maxwidth; i++)
	    ostuff[i] = mvwinch(win, cur_y, i);
	  attrs = getattrs(win);
	  init_bottom = 1;
	}
	scrollok(win, TRUE);
	scroll(win);
	scrollok(win, FALSE);
	wmove(win, cur_y, 0);
	for (i = 0; i < x; i++) {
	  wattrset(win, ostuff[i]&A_ATTRIBUTES);
	  waddch(win, ostuff[i]);
	}
	wattrset(win, attrs);
	for ( ; i < width; i++)
	  waddch(win, ' ');
	for ( ; i < maxwidth; i++) {
	  wattrset(win, ostuff[i]&A_ATTRIBUTES);
	  waddch(win, ostuff[i]);
	}
	wattrset(win, attrs);
	wrefresh(win);
      }
      wmove(win, cur_y, cur_x = x);
    }
    waddstr(win, word);
  }
  else if (center && strlen(tempstr) <= width-x*2) {    /* If prompt is short */
    wmove(win, cur_y, (width - strlen(tempstr)) / 2);
    waddstr(win, tempstr);
  }
  else if (!center && strlen(tempstr) <= width-cur_x) {    /* If prompt is short */
    waddstr(win, tempstr);
  }
  else {
    char *p = tempstr;

    /* Print prompt word by word, wrap around if necessary */
    while ((word = strsep(&p, "\t\n ")) != NULL) {
      int loop;
      unsigned char sc;

      if (*word == '\0')
	continue;
      do {
	loop = 0;
	if (cur_x+strlen(word) >= width+1) {    /* wrap around to next line */
	  if (x+strlen(word) >= width+1) {
	    sc = word[width-cur_x-1];
	    word[width-cur_x-1] = '\0';
	    wmove(win, cur_y, cur_x);
	    waddstr(win, word);
	    word[width-cur_x-1] = sc;
	    word += width-cur_x-1;
	    getyx(win, cur_y, cur_x);
	    loop = 1;
	  }
	  cur_y++;
	  cur_x = x;
	  if (cur_y > height) {
	    cur_y--;
	    if (!init_bottom) {
	      for (i = 0; i < x; i++)
		ostuff[i] = mvwinch(win, cur_y, i);
	      for (i = width; i < maxwidth; i++)
		ostuff[i] = mvwinch(win, cur_y, i);
	      attrs = getattrs(win);
	      init_bottom = 1;
	    }
	    scrollok(win, TRUE);
	    scroll(win);
	    scrollok(win, FALSE);
	    wmove(win, cur_y, 0);
	    for (i = 0; i < x; i++) {
	      wattrset(win, ostuff[i]&A_ATTRIBUTES);
	      waddch(win, ostuff[i]);
	    }
	    wattrset(win, attrs);
	    for ( ; i < width; i++)
	      waddch(win, ' ');
	    for ( ; i < maxwidth; i++) {
	      wattrset(win, ostuff[i]&A_ATTRIBUTES);
	      waddch(win, ostuff[i]);
	    }
	    wattrset(win, attrs);
	    wrefresh(win);
	  }
	}
      }
      while(loop);
      wmove(win, cur_y, cur_x);
      waddstr(win, word);
      getyx(win, cur_y, cur_x);
      cur_x++;
    }
  }
}
/* End of print_autowrap() */


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

  wmove(win, y, x);
  wattrset(win, selected ? button_active_attr : button_inactive_attr);
  waddstr(win, selected ? "[" : " ");
  temp = strspn(label, " ");
  label += temp;
  for (i = 0; i < temp; i++)
    waddch(win, ' ');
  wattrset(win, selected ? button_key_active_attr : button_key_inactive_attr);
  waddch(win, label[0]);
  wattrset(win, selected ? button_active_attr : button_inactive_attr);
  waddstr(win, label+1);
  waddstr(win, selected ? "]" : " ");
  wmove(win, y, x+temp+1);
}
/* End of print_button() */


/*
 * 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 | ' ');
  }
}
/* End of draw_box() */


#ifdef HAVE_NCURSES
/*
 * 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,sx,sy;
  chtype attrs;

  if (has_colors()) {    /* Whether terminal supports color? */
    getbegyx(win,sy,sx);
    attrs = getattrs(win);
    if (y+height < getmaxy(win)) {
	/* small touch */
	wattrset(win, A_INVIS);
	wmove(win, y + height, x + 2);
	for (i = 0; i < width; i++)
	    if (i+x+2 < getmaxx(win))
	       waddch(win, ' ');
	/* end touch */
	wattrset(win, shadow_attr);
	wmove(win, y + height, x + 2);
	for (i = 0; i < width; i++)
	    if (i+x+2 < getmaxx(win))
	       waddch(win, mvwinch(newscr, sy+y+height, sx+x+2+i) & A_CHARTEXT);
    }
    if (x+width < getmaxx(win)) {
	for (i = y + 1; i < y + height + 1; i++) {
	  if (i < getmaxy(win)) {
	      /* small touch */
	      wattrset(win, A_INVIS);
	      wmove(win, i, x + width);
	      waddch(win, ' ');
	      if (x+width+1 < getmaxx(win))
		    waddch(win, ' ');
	      /* end touch */
	      wattrset(win, shadow_attr);
	      wmove(win, i, x + width);
	      waddch(win, mvwinch(newscr, sy+i, sx+x+width) & A_CHARTEXT);
	      if (x+width+1 < getmaxx(win))
		    waddch(win, mvwinch(newscr, sy+i, sx+x+width+1) & A_CHARTEXT);
	  }
	}
    }
    wattrset(win, attrs);
    wnoutrefresh(win);
  }
}
/* End of draw_shadow() */
#endif

void dialog_clear_norefresh(void)
{
    attr_clear(stdscr, LINES, COLS, screen_attr);
    touchwin(stdscr);
    wnoutrefresh(stdscr);
}

void dialog_clear(void)
{
    dialog_clear_norefresh();
    doupdate();
}

void dialog_update(void)
{
    refresh();
}

void end_dialog(void)
{
    endwin();
}

int strwidth(const char *p)
{
	int i = 0, len, incr;
	const char *start, *s, *s1, *s2;

	for (start = s = p; ; start = (s += incr)) {
		s1 = strchr(s, '\n');
		s2 = strstr(s, "\\n");
		if (s2 == NULL)
			s = s1;
		else if (s1 == NULL)
			s = s2;
		else
			s = MIN(s1, s2);
		if (s == NULL)
			break;
		incr = 1 + (s == s2);
		len = s - start;
		if (len > i)
			i = len;
	}
	len = strlen(start);
	if (len > i)
		i = len;
	return i;
}

int strheight(const char *p)
{
	int i = 1, incr;
	const char *s, *s1, *s2;

	for (s = p; ; s += incr) {
		s1 = strchr(s, '\n');
		s2 = strstr(s, "\\n");
		if (s2 == NULL)
			s = s1;
		else if (s1 == NULL)
			s = s2;
		else
			s = MIN(s1, s2);
		if (s == NULL)
			break;
		incr = 1 + (s == s2);
		i++;
	}
	return i;
}

void print_arrows(WINDOW *dialog, int scroll, int menu_height, int item_no,
		  int box_x, int box_y, int tag_x, int cur_x, int cur_y)
{
    wmove(dialog, box_y, box_x + tag_x + 1);
    wattrset(dialog, scroll ? uarrow_attr : menubox_attr);
    waddch(dialog, scroll ? ACS_UARROW : ACS_HLINE);
    wmove(dialog, box_y, box_x + tag_x + 2);
    waddch(dialog, scroll ? '(' : ACS_HLINE);
    wmove(dialog, box_y, box_x + tag_x + 3);
    waddch(dialog, scroll ? '-' : ACS_HLINE);
    wmove(dialog, box_y, box_x + tag_x + 4);
    waddch(dialog, scroll ? ')' : ACS_HLINE);
    wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
    wattrset(dialog, scroll+menu_height < item_no ? darrow_attr : menubox_border_attr);
    waddch(dialog, scroll+menu_height < item_no ? ACS_DARROW : ACS_HLINE);
    wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
    waddch(dialog, scroll+menu_height < item_no ? '(' : ACS_HLINE);
    wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 3);
    waddch(dialog, scroll+menu_height < item_no ? '+' : ACS_HLINE);
    wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 4);
    waddch(dialog, scroll+menu_height < item_no ? ')' : ACS_HLINE);
    wmove(dialog, cur_y, cur_x);  /* Restore cursor position */
}