[linux-2.6-block.git] / scripts / kconfig / lxdialog / textbox.c

/*
 *  textbox.c -- implements the text box
 *
 *  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 "dialog.h"

static void back_lines(int n);
static void print_page(WINDOW * win, int height, int width);
static void print_line(WINDOW * win, int row, int width);
static char *get_line(void);
static void print_position(WINDOW * win, int height, int width);

static int hscroll, fd, file_size, bytes_read;
static int begin_reached = 1, end_reached, page_length;
static char *buf, *page;

/*
 * Display text from a file in a dialog box.
 */
int dialog_textbox(const char *title, const char *file, int height, int width)
{
	int i, x, y, cur_x, cur_y, fpos, key = 0;
	int passed_end;
	char search_term[MAX_LEN + 1];
	WINDOW *dialog, *text;

	search_term[0] = '\0';	/* no search term entered yet */

	/* Open input file for reading */
	if ((fd = open(file, O_RDONLY)) == -1) {
		endwin();
		fprintf(stderr, "\nCan't open input file in dialog_textbox().\n");
		exit(-1);
	}
	/* Get file size. Actually, 'file_size' is the real file size - 1,
	   since it's only the last byte offset from the beginning */
	if ((file_size = lseek(fd, 0, SEEK_END)) == -1) {
		endwin();
		fprintf(stderr, "\nError getting file size in dialog_textbox().\n");
		exit(-1);
	}
	/* Restore file pointer to beginning of file after getting file size */
	if (lseek(fd, 0, SEEK_SET) == -1) {
		endwin();
		fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
		exit(-1);
	}
	/* Allocate space for read buffer */
	if ((buf = malloc(BUF_SIZE + 1)) == NULL) {
		endwin();
		fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n");
		exit(-1);
	}
	if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) {
		endwin();
		fprintf(stderr, "\nError reading file in dialog_textbox().\n");
		exit(-1);
	}
	buf[bytes_read] = '\0';	/* mark end of valid data */
	page = buf;		/* page is pointer to start of page to be displayed */

	/* center dialog box on screen */
	x = (COLS - width) / 2;
	y = (LINES - height) / 2;

	draw_shadow(stdscr, y, x, height, width);

	dialog = newwin(height, width, y, x);
	keypad(dialog, TRUE);

	/* Create window for text region, used for scrolling text */
	text = subwin(dialog, height - 4, width - 2, y + 1, x + 1);
	wattrset(text, dlg.dialog.atr);
	wbkgdset(text, dlg.dialog.atr & A_COLOR);

	keypad(text, TRUE);

	/* register the new window, along with its borders */
	draw_box(dialog, 0, 0, height, width,
		 dlg.dialog.atr, dlg.border.atr);

	wattrset(dialog, dlg.border.atr);
	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
	for (i = 0; i < width - 2; i++)
		waddch(dialog, ACS_HLINE);
	wattrset(dialog, dlg.dialog.atr);
	wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
	waddch(dialog, ACS_RTEE);

	print_title(dialog, title, width);

	print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
	wnoutrefresh(dialog);
	getyx(dialog, cur_y, cur_x);	/* Save cursor position */

	/* Print first page of text */
	attr_clear(text, height - 4, width - 2, dlg.dialog.atr);
	print_page(text, height - 4, width - 2);
	print_position(dialog, height, width);
	wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
	wrefresh(dialog);

	while ((key != ESC) && (key != '\n')) {
		key = wgetch(dialog);
		switch (key) {
		case 'E':	/* Exit */
		case 'e':
		case 'X':
		case 'x':
			delwin(dialog);
			free(buf);
			close(fd);
			return 0;
		case 'g':	/* First page */
		case KEY_HOME:
			if (!begin_reached) {
				begin_reached = 1;
				/* First page not in buffer? */
				if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
					endwin();
					fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
					exit(-1);
				}
				if (fpos > bytes_read) {	/* Yes, we have to read it in */
					if (lseek(fd, 0, SEEK_SET) == -1) {
						endwin();
						fprintf(stderr, "\nError moving file pointer in "
							        "dialog_textbox().\n");
						exit(-1);
					}
					if ((bytes_read =
					     read(fd, buf, BUF_SIZE)) == -1) {
						endwin();
						fprintf(stderr, "\nError reading file in dialog_textbox().\n");
						exit(-1);
					}
					buf[bytes_read] = '\0';
				}
				page = buf;
				print_page(text, height - 4, width - 2);
				print_position(dialog, height, width);
				wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
				wrefresh(dialog);
			}
			break;
		case 'G':	/* Last page */
		case KEY_END:

			end_reached = 1;
			/* Last page not in buffer? */
			if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
				endwin();
				fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
				exit(-1);
			}
			if (fpos < file_size) {	/* Yes, we have to read it in */
				if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) {
					endwin();
					fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
					exit(-1);
				}
				if ((bytes_read =
				     read(fd, buf, BUF_SIZE)) == -1) {
					endwin();
					fprintf(stderr, "\nError reading file in dialog_textbox().\n");
					exit(-1);
				}
				buf[bytes_read] = '\0';
			}
			page = buf + bytes_read;
			back_lines(height - 4);
			print_page(text, height - 4, width - 2);
			print_position(dialog, height, width);
			wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
			wrefresh(dialog);
			break;
		case 'K':	/* Previous line */
		case 'k':
		case KEY_UP:
			if (!begin_reached) {
				back_lines(page_length + 1);

				/* We don't call print_page() here but use scrolling to ensure
				   faster screen update. However, 'end_reached' and
				   'page_length' should still be updated, and 'page' should
				   point to start of next page. This is done by calling
				   get_line() in the following 'for' loop. */
				scrollok(text, TRUE);
				wscrl(text, -1);	/* Scroll text region down one line */
				scrollok(text, FALSE);
				page_length = 0;
				passed_end = 0;
				for (i = 0; i < height - 4; i++) {
					if (!i) {
						/* print first line of page */
						print_line(text, 0, width - 2);
						wnoutrefresh(text);
					} else
						/* Called to update 'end_reached' and 'page' */
						get_line();
					if (!passed_end)
						page_length++;
					if (end_reached && !passed_end)
						passed_end = 1;
				}

				print_position(dialog, height, width);
				wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
				wrefresh(dialog);
			}
			break;
		case 'B':	/* Previous page */
		case 'b':
		case KEY_PPAGE:
			if (begin_reached)
				break;
			back_lines(page_length + height - 4);
			print_page(text, height - 4, width - 2);
			print_position(dialog, height, width);
			wmove(dialog, cur_y, cur_x);
			wrefresh(dialog);
			break;
		case 'J':	/* Next line */
		case 'j':
		case KEY_DOWN:
			if (!end_reached) {
				begin_reached = 0;
				scrollok(text, TRUE);
				scroll(text);	/* Scroll text region up one line */
				scrollok(text, FALSE);
				print_line(text, height - 5, width - 2);
				wnoutrefresh(text);
				print_position(dialog, height, width);
				wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
				wrefresh(dialog);
			}
			break;
		case KEY_NPAGE:	/* Next page */
		case ' ':
			if (end_reached)
				break;

			begin_reached = 0;
			print_page(text, height - 4, width - 2);
			print_position(dialog, height, width);
			wmove(dialog, cur_y, cur_x);
			wrefresh(dialog);
			break;
		case '0':	/* Beginning of line */
		case 'H':	/* Scroll left */
		case 'h':
		case KEY_LEFT:
			if (hscroll <= 0)
				break;

			if (key == '0')
				hscroll = 0;
			else
				hscroll--;
			/* Reprint current page to scroll horizontally */
			back_lines(page_length);
			print_page(text, height - 4, width - 2);
			wmove(dialog, cur_y, cur_x);
			wrefresh(dialog);
			break;
		case 'L':	/* Scroll right */
		case 'l':
		case KEY_RIGHT:
			if (hscroll >= MAX_LEN)
				break;
			hscroll++;
			/* Reprint current page to scroll horizontally */
			back_lines(page_length);
			print_page(text, height - 4, width - 2);
			wmove(dialog, cur_y, cur_x);
			wrefresh(dialog);
			break;
		case ESC:
			break;
		}
	}

	delwin(dialog);
	free(buf);
	close(fd);
	return -1;		/* ESC pressed */
}

/*
 * Go back 'n' lines in text file. Called by dialog_textbox().
 * 'page' will be updated to point to the desired line in 'buf'.
 */
static void back_lines(int n)
{
	int i, fpos;

	begin_reached = 0;
	/* We have to distinguish between end_reached and !end_reached
	   since at end of file, the line is not ended by a '\n'.
	   The code inside 'if' basically does a '--page' to move one
	   character backward so as to skip '\n' of the previous line */
	if (!end_reached) {
		/* Either beginning of buffer or beginning of file reached? */
		if (page == buf) {
			if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
				endwin();
				fprintf(stderr, "\nError moving file pointer in "
					        "back_lines().\n");
				exit(-1);
			}
			if (fpos > bytes_read) {	/* Not beginning of file yet */
				/* We've reached beginning of buffer, but not beginning of
				   file yet, so read previous part of file into buffer.
				   Note that we only move backward for BUF_SIZE/2 bytes,
				   but not BUF_SIZE bytes to avoid re-reading again in
				   print_page() later */
				/* Really possible to move backward BUF_SIZE/2 bytes? */
				if (fpos < BUF_SIZE / 2 + bytes_read) {
					/* No, move less then */
					if (lseek(fd, 0, SEEK_SET) == -1) {
						endwin();
						fprintf(stderr, "\nError moving file pointer in "
						                "back_lines().\n");
						exit(-1);
					}
					page = buf + fpos - bytes_read;
				} else {	/* Move backward BUF_SIZE/2 bytes */
					if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
						endwin();
						fprintf(stderr, "\nError moving file pointer "
						                "in back_lines().\n");
						exit(-1);
					}
					page = buf + BUF_SIZE / 2;
				}
				if ((bytes_read =
				     read(fd, buf, BUF_SIZE)) == -1) {
					endwin();
					fprintf(stderr, "\nError reading file in back_lines().\n");
					exit(-1);
				}
				buf[bytes_read] = '\0';
			} else {	/* Beginning of file reached */
				begin_reached = 1;
				return;
			}
		}
		if (*(--page) != '\n') {	/* '--page' here */
			/* Something's wrong... */
			endwin();
			fprintf(stderr, "\nInternal error in back_lines().\n");
			exit(-1);
		}
	}
	/* Go back 'n' lines */
	for (i = 0; i < n; i++)
		do {
			if (page == buf) {
				if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
					endwin();
					fprintf(stderr, "\nError moving file pointer in back_lines().\n");
					exit(-1);
				}
				if (fpos > bytes_read) {
					/* Really possible to move backward BUF_SIZE/2 bytes? */
					if (fpos < BUF_SIZE / 2 + bytes_read) {
						/* No, move less then */
						if (lseek(fd, 0, SEEK_SET) == -1) {
							endwin();
							fprintf(stderr, "\nError moving file pointer "
							                "in back_lines().\n");
							exit(-1);
						}
						page = buf + fpos - bytes_read;
					} else {	/* Move backward BUF_SIZE/2 bytes */
						if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
							endwin();
							fprintf(stderr, "\nError moving file pointer"
							                " in back_lines().\n");
							exit(-1);
						}
						page = buf + BUF_SIZE / 2;
					}
					if ((bytes_read =
					     read(fd, buf, BUF_SIZE)) == -1) {
						endwin();
						fprintf(stderr, "\nError reading file in "
						                "back_lines().\n");
						exit(-1);
					}
					buf[bytes_read] = '\0';
				} else {	/* Beginning of file reached */
					begin_reached = 1;
					return;
				}
			}
		} while (*(--page) != '\n');
	page++;
}

/*
 * Print a new page of text. Called by dialog_textbox().
 */
static void print_page(WINDOW * win, int height, int width)
{
	int i, passed_end = 0;

	page_length = 0;
	for (i = 0; i < height; i++) {
		print_line(win, i, width);
		if (!passed_end)
			page_length++;
		if (end_reached && !passed_end)
			passed_end = 1;
	}
	wnoutrefresh(win);
}

/*
 * Print a new line of text. Called by dialog_textbox() and print_page().
 */
static void print_line(WINDOW * win, int row, int width)
{
	int y, x;
	char *line;

	line = get_line();
	line += MIN(strlen(line), hscroll);	/* Scroll horizontally */
	wmove(win, row, 0);	/* move cursor to correct line */
	waddch(win, ' ');
	waddnstr(win, line, MIN(strlen(line), width - 2));

	getyx(win, y, x);
	/* Clear 'residue' of previous line */
#if OLD_NCURSES
	{
		int i;
		for (i = 0; i < width - x; i++)
			waddch(win, ' ');
	}
#else
	wclrtoeol(win);
#endif
}

/*
 * Return current line of text. Called by dialog_textbox() and print_line().
 * 'page' should point to start of current line before calling, and will be
 * updated to point to start of next line.
 */
static char *get_line(void)
{
	int i = 0, fpos;
	static char line[MAX_LEN + 1];

	end_reached = 0;
	while (*page != '\n') {
		if (*page == '\0') {
			/* Either end of file or end of buffer reached */
			if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
				endwin();
				fprintf(stderr, "\nError moving file pointer in "
				                "get_line().\n");
				exit(-1);
			}
			if (fpos < file_size) {	/* Not end of file yet */
				/* We've reached end of buffer, but not end of file yet,
				   so read next part of file into buffer */
				if ((bytes_read =
				     read(fd, buf, BUF_SIZE)) == -1) {
					endwin();
					fprintf(stderr, "\nError reading file in get_line().\n");
					exit(-1);
				}
				buf[bytes_read] = '\0';
				page = buf;
			} else {
				if (!end_reached)
					end_reached = 1;
				break;
			}
		} else if (i < MAX_LEN)
			line[i++] = *(page++);
		else {
			/* Truncate lines longer than MAX_LEN characters */
			if (i == MAX_LEN)
				line[i++] = '\0';
			page++;
		}
	}
	if (i <= MAX_LEN)
		line[i] = '\0';
	if (!end_reached)
		page++;		/* move pass '\n' */

	return line;
}

/*
 * Print current position
 */
static void print_position(WINDOW * win, int height, int width)
{
	int fpos, percent;

	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
		endwin();
		fprintf(stderr, "\nError moving file pointer in print_position().\n");
		exit(-1);
	}
	wattrset(win, dlg.position_indicator.atr);
	wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
	percent = !file_size ?
	    100 : ((fpos - bytes_read + page - buf) * 100) / file_size;
	wmove(win, height - 3, width - 9);
	wprintw(win, "(%3d%%)", percent);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* textbox.c -- implements the text box
	3	*
	4	* ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
	5	* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version 2
	10	* of the License, or (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include "dialog.h"
	23
b1c5f1c6 SR	24	static void back_lines(int n);
	25	static void print_page(WINDOW * win, int height, int width);
	26	static void print_line(WINDOW * win, int row, int width);
	27	static char *get_line(void);
	28	static void print_position(WINDOW * win, int height, int width);
1da177e4 LT	29
	30	static int hscroll, fd, file_size, bytes_read;
	31	static int begin_reached = 1, end_reached, page_length;
	32	static char buf, page;
	33
	34	/*
	35	* Display text from a file in a dialog box.
	36	*/
b1c5f1c6	37	int dialog_textbox(const char title, const char file, int height, int width)
1da177e4	38	{
b1c5f1c6 SR	39	int i, x, y, cur_x, cur_y, fpos, key = 0;
	40	int passed_end;
	41	char search_term[MAX_LEN + 1];
	42	WINDOW dialog, text;
	43
	44	search_term[0] = '\0'; /* no search term entered yet */
	45
	46	/* Open input file for reading */
	47	if ((fd = open(file, O_RDONLY)) == -1) {
	48	endwin();
dec69da8	49	fprintf(stderr, "\nCan't open input file in dialog_textbox().\n");
b1c5f1c6 SR	50	exit(-1);
	51	}
	52	/* Get file size. Actually, 'file_size' is the real file size - 1,
	53	since it's only the last byte offset from the beginning */
	54	if ((file_size = lseek(fd, 0, SEEK_END)) == -1) {
	55	endwin();
dec69da8	56	fprintf(stderr, "\nError getting file size in dialog_textbox().\n");
b1c5f1c6 SR	57	exit(-1);
	58	}
	59	/* Restore file pointer to beginning of file after getting file size */
	60	if (lseek(fd, 0, SEEK_SET) == -1) {
	61	endwin();
dec69da8	62	fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
b1c5f1c6 SR	63	exit(-1);
	64	}
	65	/* Allocate space for read buffer */
	66	if ((buf = malloc(BUF_SIZE + 1)) == NULL) {
	67	endwin();
dec69da8	68	fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n");
b1c5f1c6 SR	69	exit(-1);
	70	}
	71	if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) {
	72	endwin();
	73	fprintf(stderr, "\nError reading file in dialog_textbox().\n");
	74	exit(-1);
	75	}
	76	buf[bytes_read] = '\0'; /* mark end of valid data */
	77	page = buf; /* page is pointer to start of page to be displayed */
	78
	79	/* center dialog box on screen */
	80	x = (COLS - width) / 2;
	81	y = (LINES - height) / 2;
	82
	83	draw_shadow(stdscr, y, x, height, width);
	84
	85	dialog = newwin(height, width, y, x);
	86	keypad(dialog, TRUE);
	87
	88	/* Create window for text region, used for scrolling text */
	89	text = subwin(dialog, height - 4, width - 2, y + 1, x + 1);
98e5a157 SR	90	wattrset(text, dlg.dialog.atr);
98e5a157 SR	91	wbkgdset(text, dlg.dialog.atr & A_COLOR);
b1c5f1c6 SR	92
	93	keypad(text, TRUE);
	94
	95	/* register the new window, along with its borders */
98e5a157 SR	96	draw_box(dialog, 0, 0, height, width,
98e5a157 SR	97	dlg.dialog.atr, dlg.border.atr);
b1c5f1c6	98
98e5a157	99	wattrset(dialog, dlg.border.atr);
b1c5f1c6 SR	100	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
	101	for (i = 0; i < width - 2; i++)
	102	waddch(dialog, ACS_HLINE);
98e5a157 SR	103	wattrset(dialog, dlg.dialog.atr);
98e5a157 SR	104	wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
b1c5f1c6 SR	105	waddch(dialog, ACS_RTEE);
b1c5f1c6 SR	106
fa7009d5	107	print_title(dialog, title, width);
1da177e4	108
b1c5f1c6 SR	109	print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
	110	wnoutrefresh(dialog);
	111	getyx(dialog, cur_y, cur_x); /* Save cursor position */
	112
	113	/* Print first page of text */
98e5a157	114	attr_clear(text, height - 4, width - 2, dlg.dialog.atr);
b1c5f1c6 SR	115	print_page(text, height - 4, width - 2);
	116	print_position(dialog, height, width);
	117	wmove(dialog, cur_y, cur_x); /* Restore cursor position */
	118	wrefresh(dialog);
	119
	120	while ((key != ESC) && (key != '\n')) {
	121	key = wgetch(dialog);
	122	switch (key) {
	123	case 'E': /* Exit */
	124	case 'e':
	125	case 'X':
	126	case 'x':
	127	delwin(dialog);
	128	free(buf);
	129	close(fd);
	130	return 0;
	131	case 'g': /* First page */
	132	case KEY_HOME:
	133	if (!begin_reached) {
	134	begin_reached = 1;
	135	/* First page not in buffer? */
	136	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
	137	endwin();
dec69da8	138	fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
b1c5f1c6 SR	139	exit(-1);
	140	}
	141	if (fpos > bytes_read) { /* Yes, we have to read it in */
	142	if (lseek(fd, 0, SEEK_SET) == -1) {
	143	endwin();
dec69da8 SR	144	fprintf(stderr, "\nError moving file pointer in "
dec69da8 SR	145	"dialog_textbox().\n");
b1c5f1c6 SR	146	exit(-1);
	147	}
	148	if ((bytes_read =
	149	read(fd, buf, BUF_SIZE)) == -1) {
	150	endwin();
dec69da8	151	fprintf(stderr, "\nError reading file in dialog_textbox().\n");
b1c5f1c6 SR	152	exit(-1);
	153	}
	154	buf[bytes_read] = '\0';
	155	}
	156	page = buf;
	157	print_page(text, height - 4, width - 2);
	158	print_position(dialog, height, width);
	159	wmove(dialog, cur_y, cur_x); /* Restore cursor position */
	160	wrefresh(dialog);
	161	}
	162	break;
	163	case 'G': /* Last page */
	164	case KEY_END:
	165
	166	end_reached = 1;
	167	/* Last page not in buffer? */
	168	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
	169	endwin();
dec69da8	170	fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
b1c5f1c6 SR	171	exit(-1);
	172	}
	173	if (fpos < file_size) { /* Yes, we have to read it in */
	174	if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) {
	175	endwin();
dec69da8	176	fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
b1c5f1c6 SR	177	exit(-1);
	178	}
	179	if ((bytes_read =
	180	read(fd, buf, BUF_SIZE)) == -1) {
	181	endwin();
dec69da8	182	fprintf(stderr, "\nError reading file in dialog_textbox().\n");
b1c5f1c6 SR	183	exit(-1);
	184	}
	185	buf[bytes_read] = '\0';
	186	}
	187	page = buf + bytes_read;
	188	back_lines(height - 4);
	189	print_page(text, height - 4, width - 2);
	190	print_position(dialog, height, width);
	191	wmove(dialog, cur_y, cur_x); /* Restore cursor position */
	192	wrefresh(dialog);
	193	break;
	194	case 'K': /* Previous line */
	195	case 'k':
	196	case KEY_UP:
	197	if (!begin_reached) {
	198	back_lines(page_length + 1);
	199
	200	/* We don't call print_page() here but use scrolling to ensure
	201	faster screen update. However, 'end_reached' and
	202	'page_length' should still be updated, and 'page' should
	203	point to start of next page. This is done by calling
	204	get_line() in the following 'for' loop. */
	205	scrollok(text, TRUE);
	206	wscrl(text, -1); /* Scroll text region down one line */
	207	scrollok(text, FALSE);
	208	page_length = 0;
	209	passed_end = 0;
	210	for (i = 0; i < height - 4; i++) {
	211	if (!i) {
	212	/* print first line of page */
	213	print_line(text, 0, width - 2);
	214	wnoutrefresh(text);
	215	} else
	216	/* Called to update 'end_reached' and 'page' */
	217	get_line();
	218	if (!passed_end)
	219	page_length++;
	220	if (end_reached && !passed_end)
	221	passed_end = 1;
	222	}
	223
	224	print_position(dialog, height, width);
	225	wmove(dialog, cur_y, cur_x); /* Restore cursor position */
	226	wrefresh(dialog);
	227	}
	228	break;
	229	case 'B': /* Previous page */
	230	case 'b':
	231	case KEY_PPAGE:
	232	if (begin_reached)
	233	break;
	234	back_lines(page_length + height - 4);
	235	print_page(text, height - 4, width - 2);
	236	print_position(dialog, height, width);
	237	wmove(dialog, cur_y, cur_x);
	238	wrefresh(dialog);
	239	break;
	240	case 'J': /* Next line */
	241	case 'j':
	242	case KEY_DOWN:
	243	if (!end_reached) {
	244	begin_reached = 0;
	245	scrollok(text, TRUE);
	246	scroll(text); /* Scroll text region up one line */
247	scrollok(text, FALSE);
248	print_line(text, height - 5, width - 2);
249	wnoutrefresh(text);
250	print_position(dialog, height, width);
251	wmove(dialog, cur_y, cur_x); /* Restore cursor position */
252	wrefresh(dialog);
253	}
254	break;
255	case KEY_NPAGE: /* Next page */
256	case ' ':
257	if (end_reached)
258	break;
259
260	begin_reached = 0;
261	print_page(text, height - 4, width - 2);
262	print_position(dialog, height, width);
263	wmove(dialog, cur_y, cur_x);
264	wrefresh(dialog);
265	break;
266	case '0': /* Beginning of line */
267	case 'H': /* Scroll left */
268	case 'h':
269	case KEY_LEFT:
270	if (hscroll <= 0)
271	break;
272
273	if (key == '0')
274	hscroll = 0;
275	else
276	hscroll--;
277	/* Reprint current page to scroll horizontally */
278	back_lines(page_length);
279	print_page(text, height - 4, width - 2);
280	wmove(dialog, cur_y, cur_x);
281	wrefresh(dialog);
282	break;
283	case 'L': /* Scroll right */
284	case 'l':
285	case KEY_RIGHT:
286	if (hscroll >= MAX_LEN)
287	break;
288	hscroll++;
289	/* Reprint current page to scroll horizontally */
290	back_lines(page_length);
291	print_page(text, height - 4, width - 2);
292	wmove(dialog, cur_y, cur_x);
293	wrefresh(dialog);
294	break;
295	case ESC:
296	break;
297	}
1da177e4	298	}
1da177e4	299
b1c5f1c6 SR	300	delwin(dialog);
	301	free(buf);
	302	close(fd);
	303	return -1; /* ESC pressed */
1da177e4 LT	304	}
	305
	306	/*
	307	* Go back 'n' lines in text file. Called by dialog_textbox().
	308	* 'page' will be updated to point to the desired line in 'buf'.
	309	*/
b1c5f1c6	310	static void back_lines(int n)
1da177e4	311	{
b1c5f1c6 SR	312	int i, fpos;
	313
	314	begin_reached = 0;
	315	/* We have to distinguish between end_reached and !end_reached
	316	since at end of file, the line is not ended by a '\n'.
	317	The code inside 'if' basically does a '--page' to move one
	318	character backward so as to skip '\n' of the previous line */
	319	if (!end_reached) {
	320	/* Either beginning of buffer or beginning of file reached? */
	321	if (page == buf) {
	322	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
	323	endwin();
dec69da8 SR	324	fprintf(stderr, "\nError moving file pointer in "
dec69da8 SR	325	"back_lines().\n");
b1c5f1c6 SR	326	exit(-1);
	327	}
	328	if (fpos > bytes_read) { /* Not beginning of file yet */
	329	/* We've reached beginning of buffer, but not beginning of
	330	file yet, so read previous part of file into buffer.
	331	Note that we only move backward for BUF_SIZE/2 bytes,
	332	but not BUF_SIZE bytes to avoid re-reading again in
	333	print_page() later */
	334	/* Really possible to move backward BUF_SIZE/2 bytes? */
	335	if (fpos < BUF_SIZE / 2 + bytes_read) {
	336	/* No, move less then */
	337	if (lseek(fd, 0, SEEK_SET) == -1) {
	338	endwin();
dec69da8 SR	339	fprintf(stderr, "\nError moving file pointer in "
dec69da8 SR	340	"back_lines().\n");
b1c5f1c6 SR	341	exit(-1);
	342	}
	343	page = buf + fpos - bytes_read;
	344	} else { /* Move backward BUF_SIZE/2 bytes */
dec69da8	345	if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
b1c5f1c6	346	endwin();
dec69da8 SR	347	fprintf(stderr, "\nError moving file pointer "
dec69da8 SR	348	"in back_lines().\n");
b1c5f1c6 SR	349	exit(-1);
	350	}
	351	page = buf + BUF_SIZE / 2;
	352	}
	353	if ((bytes_read =
	354	read(fd, buf, BUF_SIZE)) == -1) {
	355	endwin();
dec69da8	356	fprintf(stderr, "\nError reading file in back_lines().\n");
b1c5f1c6 SR	357	exit(-1);
	358	}
	359	buf[bytes_read] = '\0';
	360	} else { /* Beginning of file reached */
	361	begin_reached = 1;
	362	return;
	363	}
1da177e4	364	}
b1c5f1c6 SR	365	if ((--page) != '\n') { / '--page' here */
	366	/* Something's wrong... */
	367	endwin();
	368	fprintf(stderr, "\nInternal error in back_lines().\n");
	369	exit(-1);
1da177e4	370	}
1da177e4	371	}
b1c5f1c6 SR	372	/* Go back 'n' lines */
	373	for (i = 0; i < n; i++)
	374	do {
	375	if (page == buf) {
	376	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
	377	endwin();
dec69da8	378	fprintf(stderr, "\nError moving file pointer in back_lines().\n");
b1c5f1c6 SR	379	exit(-1);
	380	}
	381	if (fpos > bytes_read) {
	382	/* Really possible to move backward BUF_SIZE/2 bytes? */
	383	if (fpos < BUF_SIZE / 2 + bytes_read) {
	384	/* No, move less then */
dec69da8	385	if (lseek(fd, 0, SEEK_SET) == -1) {
b1c5f1c6	386	endwin();
dec69da8 SR	387	fprintf(stderr, "\nError moving file pointer "
dec69da8 SR	388	"in back_lines().\n");
b1c5f1c6 SR	389	exit(-1);
	390	}
	391	page = buf + fpos - bytes_read;
	392	} else { /* Move backward BUF_SIZE/2 bytes */
dec69da8	393	if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
b1c5f1c6	394	endwin();
dec69da8 SR	395	fprintf(stderr, "\nError moving file pointer"
dec69da8 SR	396	" in back_lines().\n");
b1c5f1c6 SR	397	exit(-1);
	398	}
	399	page = buf + BUF_SIZE / 2;
	400	}
	401	if ((bytes_read =
	402	read(fd, buf, BUF_SIZE)) == -1) {
	403	endwin();
dec69da8 SR	404	fprintf(stderr, "\nError reading file in "
dec69da8 SR	405	"back_lines().\n");
b1c5f1c6 SR	406	exit(-1);
	407	}
	408	buf[bytes_read] = '\0';
	409	} else { /* Beginning of file reached */
	410	begin_reached = 1;
	411	return;
	412	}
1da177e4	413	}
b1c5f1c6 SR	414	} while (*(--page) != '\n');
b1c5f1c6 SR	415	page++;
1da177e4 LT	416	}
	417
	418	/*
	419	* Print a new page of text. Called by dialog_textbox().
	420	*/
b1c5f1c6	421	static void print_page(WINDOW * win, int height, int width)
1da177e4	422	{
b1c5f1c6 SR	423	int i, passed_end = 0;
	424
	425	page_length = 0;
	426	for (i = 0; i < height; i++) {
	427	print_line(win, i, width);
	428	if (!passed_end)
	429	page_length++;
	430	if (end_reached && !passed_end)
	431	passed_end = 1;
	432	}
	433	wnoutrefresh(win);
1da177e4 LT	434	}
	435
	436	/*
	437	* Print a new line of text. Called by dialog_textbox() and print_page().
	438	*/
b1c5f1c6	439	static void print_line(WINDOW * win, int row, int width)
1da177e4	440	{
b1c5f1c6 SR	441	int y, x;
b1c5f1c6 SR	442	char *line;
1da177e4	443
b1c5f1c6 SR	444	line = get_line();
	445	line += MIN(strlen(line), hscroll); /* Scroll horizontally */
	446	wmove(win, row, 0); /* move cursor to correct line */
	447	waddch(win, ' ');
	448	waddnstr(win, line, MIN(strlen(line), width - 2));
1da177e4	449
b1c5f1c6 SR	450	getyx(win, y, x);
b1c5f1c6 SR	451	/* Clear 'residue' of previous line */
1da177e4	452	#if OLD_NCURSES
b1c5f1c6 SR	453	{
	454	int i;
	455	for (i = 0; i < width - x; i++)
	456	waddch(win, ' ');
	457	}
1da177e4	458	#else
b1c5f1c6	459	wclrtoeol(win);
1da177e4 LT	460	#endif
	461	}
	462
	463	/*
	464	* Return current line of text. Called by dialog_textbox() and print_line().
	465	* 'page' should point to start of current line before calling, and will be
	466	* updated to point to start of next line.
	467	*/
b1c5f1c6	468	static char *get_line(void)
1da177e4	469	{
b1c5f1c6 SR	470	int i = 0, fpos;
	471	static char line[MAX_LEN + 1];
	472
	473	end_reached = 0;
	474	while (*page != '\n') {
	475	if (*page == '\0') {
	476	/* Either end of file or end of buffer reached */
	477	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
	478	endwin();
dec69da8 SR	479	fprintf(stderr, "\nError moving file pointer in "
dec69da8 SR	480	"get_line().\n");
b1c5f1c6 SR	481	exit(-1);
	482	}
	483	if (fpos < file_size) { /* Not end of file yet */
	484	/* We've reached end of buffer, but not end of file yet,
	485	so read next part of file into buffer */
	486	if ((bytes_read =
	487	read(fd, buf, BUF_SIZE)) == -1) {
	488	endwin();
dec69da8	489	fprintf(stderr, "\nError reading file in get_line().\n");
b1c5f1c6 SR	490	exit(-1);
	491	}
	492	buf[bytes_read] = '\0';
	493	page = buf;
	494	} else {
	495	if (!end_reached)
	496	end_reached = 1;
	497	break;
	498	}
	499	} else if (i < MAX_LEN)
	500	line[i++] = *(page++);
	501	else {
	502	/* Truncate lines longer than MAX_LEN characters */
	503	if (i == MAX_LEN)
	504	line[i++] = '\0';
	505	page++;
1da177e4	506	}
1da177e4	507	}
b1c5f1c6 SR	508	if (i <= MAX_LEN)
	509	line[i] = '\0';
	510	if (!end_reached)
	511	page++; /* move pass '\n' */
1da177e4	512
b1c5f1c6	513	return line;
1da177e4 LT	514	}
	515
	516	/*
	517	* Print current position
	518	*/
b1c5f1c6	519	static void print_position(WINDOW * win, int height, int width)
1da177e4	520	{
b1c5f1c6 SR	521	int fpos, percent;
	522
	523	if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
	524	endwin();
dec69da8	525	fprintf(stderr, "\nError moving file pointer in print_position().\n");
b1c5f1c6 SR	526	exit(-1);
b1c5f1c6 SR	527	}
98e5a157 SR	528	wattrset(win, dlg.position_indicator.atr);
98e5a157 SR	529	wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
b1c5f1c6 SR	530	percent = !file_size ?
	531	100 : ((fpos - bytes_read + page - buf) * 100) / file_size;
	532	wmove(win, height - 3, width - 9);
	533	wprintw(win, "(%3d%%)", percent);
1da177e4	534	}