534 lines
15 KiB
C
534 lines
15 KiB
C
/*
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* textbox.c -- implements the text box
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*
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* ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "dialog.h"
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static void back_lines(int n);
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static void print_page(WINDOW * win, int height, int width);
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static void print_line(WINDOW * win, int row, int width);
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static char *get_line(void);
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static void print_position(WINDOW * win, int height, int width);
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static int hscroll, fd, file_size, bytes_read;
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static int begin_reached = 1, end_reached, page_length;
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static char *buf, *page;
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/*
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* Display text from a file in a dialog box.
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*/
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int dialog_textbox(const char *title, const char *file, int height, int width)
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{
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int i, x, y, cur_x, cur_y, fpos, key = 0;
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int passed_end;
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char search_term[MAX_LEN + 1];
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WINDOW *dialog, *text;
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search_term[0] = '\0'; /* no search term entered yet */
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/* Open input file for reading */
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if ((fd = open(file, O_RDONLY)) == -1) {
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endwin();
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fprintf(stderr, "\nCan't open input file in dialog_textbox().\n");
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exit(-1);
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}
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/* Get file size. Actually, 'file_size' is the real file size - 1,
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since it's only the last byte offset from the beginning */
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if ((file_size = lseek(fd, 0, SEEK_END)) == -1) {
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endwin();
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fprintf(stderr, "\nError getting file size in dialog_textbox().\n");
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exit(-1);
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}
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/* Restore file pointer to beginning of file after getting file size */
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if (lseek(fd, 0, SEEK_SET) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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exit(-1);
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}
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/* Allocate space for read buffer */
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if ((buf = malloc(BUF_SIZE + 1)) == NULL) {
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endwin();
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fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n");
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exit(-1);
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}
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if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) {
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endwin();
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fprintf(stderr, "\nError reading file in dialog_textbox().\n");
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exit(-1);
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}
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buf[bytes_read] = '\0'; /* mark end of valid data */
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page = buf; /* page is pointer to start of page to be displayed */
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/* center dialog box on screen */
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x = (COLS - width) / 2;
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y = (LINES - height) / 2;
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draw_shadow(stdscr, y, x, height, width);
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dialog = newwin(height, width, y, x);
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keypad(dialog, TRUE);
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/* Create window for text region, used for scrolling text */
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text = subwin(dialog, height - 4, width - 2, y + 1, x + 1);
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wattrset(text, dialog_attr);
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wbkgdset(text, dialog_attr & A_COLOR);
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keypad(text, TRUE);
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/* register the new window, along with its borders */
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draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
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wattrset(dialog, border_attr);
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mvwaddch(dialog, height - 3, 0, ACS_LTEE);
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for (i = 0; i < width - 2; i++)
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waddch(dialog, ACS_HLINE);
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wattrset(dialog, dialog_attr);
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wbkgdset(dialog, dialog_attr & A_COLOR);
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waddch(dialog, ACS_RTEE);
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print_title(dialog, title, width);
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print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
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wnoutrefresh(dialog);
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getyx(dialog, cur_y, cur_x); /* Save cursor position */
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/* Print first page of text */
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attr_clear(text, height - 4, width - 2, dialog_attr);
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print_page(text, height - 4, width - 2);
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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wrefresh(dialog);
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while ((key != ESC) && (key != '\n')) {
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key = wgetch(dialog);
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switch (key) {
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case 'E': /* Exit */
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case 'e':
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case 'X':
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case 'x':
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delwin(dialog);
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free(buf);
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close(fd);
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return 0;
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case 'g': /* First page */
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case KEY_HOME:
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if (!begin_reached) {
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begin_reached = 1;
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/* First page not in buffer? */
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if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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exit(-1);
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}
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if (fpos > bytes_read) { /* Yes, we have to read it in */
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if (lseek(fd, 0, SEEK_SET) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in "
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"dialog_textbox().\n");
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exit(-1);
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}
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if ((bytes_read =
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read(fd, buf, BUF_SIZE)) == -1) {
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endwin();
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fprintf(stderr, "\nError reading file in dialog_textbox().\n");
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exit(-1);
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}
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buf[bytes_read] = '\0';
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}
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page = buf;
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print_page(text, height - 4, width - 2);
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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wrefresh(dialog);
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}
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break;
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case 'G': /* Last page */
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case KEY_END:
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end_reached = 1;
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/* Last page not in buffer? */
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if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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exit(-1);
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}
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if (fpos < file_size) { /* Yes, we have to read it in */
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if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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exit(-1);
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}
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if ((bytes_read =
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read(fd, buf, BUF_SIZE)) == -1) {
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endwin();
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fprintf(stderr, "\nError reading file in dialog_textbox().\n");
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exit(-1);
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}
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buf[bytes_read] = '\0';
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}
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page = buf + bytes_read;
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back_lines(height - 4);
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print_page(text, height - 4, width - 2);
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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wrefresh(dialog);
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break;
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case 'K': /* Previous line */
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case 'k':
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case KEY_UP:
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if (!begin_reached) {
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back_lines(page_length + 1);
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/* We don't call print_page() here but use scrolling to ensure
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faster screen update. However, 'end_reached' and
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'page_length' should still be updated, and 'page' should
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point to start of next page. This is done by calling
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get_line() in the following 'for' loop. */
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scrollok(text, TRUE);
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wscrl(text, -1); /* Scroll text region down one line */
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scrollok(text, FALSE);
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page_length = 0;
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passed_end = 0;
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for (i = 0; i < height - 4; i++) {
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if (!i) {
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/* print first line of page */
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print_line(text, 0, width - 2);
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wnoutrefresh(text);
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} else
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/* Called to update 'end_reached' and 'page' */
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get_line();
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if (!passed_end)
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page_length++;
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if (end_reached && !passed_end)
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passed_end = 1;
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}
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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wrefresh(dialog);
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}
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break;
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case 'B': /* Previous page */
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case 'b':
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case KEY_PPAGE:
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if (begin_reached)
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break;
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back_lines(page_length + height - 4);
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print_page(text, height - 4, width - 2);
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x);
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wrefresh(dialog);
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break;
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case 'J': /* Next line */
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case 'j':
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case KEY_DOWN:
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if (!end_reached) {
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begin_reached = 0;
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scrollok(text, TRUE);
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scroll(text); /* Scroll text region up one line */
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scrollok(text, FALSE);
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print_line(text, height - 5, width - 2);
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wnoutrefresh(text);
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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wrefresh(dialog);
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}
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break;
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case KEY_NPAGE: /* Next page */
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case ' ':
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if (end_reached)
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break;
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begin_reached = 0;
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print_page(text, height - 4, width - 2);
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print_position(dialog, height, width);
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wmove(dialog, cur_y, cur_x);
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wrefresh(dialog);
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break;
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case '0': /* Beginning of line */
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case 'H': /* Scroll left */
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case 'h':
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case KEY_LEFT:
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if (hscroll <= 0)
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break;
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if (key == '0')
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hscroll = 0;
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else
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hscroll--;
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/* Reprint current page to scroll horizontally */
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back_lines(page_length);
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print_page(text, height - 4, width - 2);
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wmove(dialog, cur_y, cur_x);
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wrefresh(dialog);
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break;
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case 'L': /* Scroll right */
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case 'l':
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case KEY_RIGHT:
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if (hscroll >= MAX_LEN)
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break;
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hscroll++;
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/* Reprint current page to scroll horizontally */
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back_lines(page_length);
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print_page(text, height - 4, width - 2);
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wmove(dialog, cur_y, cur_x);
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wrefresh(dialog);
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break;
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case ESC:
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break;
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}
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}
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delwin(dialog);
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free(buf);
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close(fd);
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return -1; /* ESC pressed */
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}
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/*
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* Go back 'n' lines in text file. Called by dialog_textbox().
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* 'page' will be updated to point to the desired line in 'buf'.
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*/
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static void back_lines(int n)
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{
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int i, fpos;
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begin_reached = 0;
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/* We have to distinguish between end_reached and !end_reached
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since at end of file, the line is not ended by a '\n'.
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The code inside 'if' basically does a '--page' to move one
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character backward so as to skip '\n' of the previous line */
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if (!end_reached) {
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/* Either beginning of buffer or beginning of file reached? */
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if (page == buf) {
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if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in "
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"back_lines().\n");
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exit(-1);
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}
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if (fpos > bytes_read) { /* Not beginning of file yet */
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/* We've reached beginning of buffer, but not beginning of
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file yet, so read previous part of file into buffer.
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Note that we only move backward for BUF_SIZE/2 bytes,
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but not BUF_SIZE bytes to avoid re-reading again in
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print_page() later */
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/* Really possible to move backward BUF_SIZE/2 bytes? */
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if (fpos < BUF_SIZE / 2 + bytes_read) {
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/* No, move less then */
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if (lseek(fd, 0, SEEK_SET) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in "
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"back_lines().\n");
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exit(-1);
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}
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page = buf + fpos - bytes_read;
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} else { /* Move backward BUF_SIZE/2 bytes */
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if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer "
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"in back_lines().\n");
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exit(-1);
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}
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page = buf + BUF_SIZE / 2;
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}
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if ((bytes_read =
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read(fd, buf, BUF_SIZE)) == -1) {
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endwin();
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fprintf(stderr, "\nError reading file in back_lines().\n");
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exit(-1);
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}
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buf[bytes_read] = '\0';
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} else { /* Beginning of file reached */
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begin_reached = 1;
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return;
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}
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}
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if (*(--page) != '\n') { /* '--page' here */
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/* Something's wrong... */
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endwin();
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fprintf(stderr, "\nInternal error in back_lines().\n");
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exit(-1);
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}
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}
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/* Go back 'n' lines */
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for (i = 0; i < n; i++)
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do {
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if (page == buf) {
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if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in back_lines().\n");
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exit(-1);
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}
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if (fpos > bytes_read) {
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/* Really possible to move backward BUF_SIZE/2 bytes? */
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if (fpos < BUF_SIZE / 2 + bytes_read) {
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/* No, move less then */
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if (lseek(fd, 0, SEEK_SET) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer "
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"in back_lines().\n");
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exit(-1);
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}
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page = buf + fpos - bytes_read;
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} else { /* Move backward BUF_SIZE/2 bytes */
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if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer"
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" in back_lines().\n");
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exit(-1);
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}
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page = buf + BUF_SIZE / 2;
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}
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if ((bytes_read =
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read(fd, buf, BUF_SIZE)) == -1) {
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endwin();
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fprintf(stderr, "\nError reading file in "
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"back_lines().\n");
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exit(-1);
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}
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buf[bytes_read] = '\0';
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} else { /* Beginning of file reached */
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begin_reached = 1;
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return;
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}
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}
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} while (*(--page) != '\n');
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page++;
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}
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/*
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* Print a new page of text. Called by dialog_textbox().
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*/
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static void print_page(WINDOW * win, int height, int width)
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{
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int i, passed_end = 0;
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page_length = 0;
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for (i = 0; i < height; i++) {
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print_line(win, i, width);
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if (!passed_end)
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page_length++;
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if (end_reached && !passed_end)
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passed_end = 1;
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}
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wnoutrefresh(win);
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}
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/*
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* Print a new line of text. Called by dialog_textbox() and print_page().
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*/
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static void print_line(WINDOW * win, int row, int width)
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{
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int y, x;
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char *line;
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line = get_line();
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line += MIN(strlen(line), hscroll); /* Scroll horizontally */
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wmove(win, row, 0); /* move cursor to correct line */
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waddch(win, ' ');
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waddnstr(win, line, MIN(strlen(line), width - 2));
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getyx(win, y, x);
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/* Clear 'residue' of previous line */
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#if OLD_NCURSES
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{
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int i;
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for (i = 0; i < width - x; i++)
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waddch(win, ' ');
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}
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#else
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wclrtoeol(win);
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#endif
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}
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/*
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* Return current line of text. Called by dialog_textbox() and print_line().
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* 'page' should point to start of current line before calling, and will be
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* updated to point to start of next line.
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*/
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static char *get_line(void)
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{
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int i = 0, fpos;
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static char line[MAX_LEN + 1];
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end_reached = 0;
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while (*page != '\n') {
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if (*page == '\0') {
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/* Either end of file or end of buffer reached */
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if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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endwin();
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fprintf(stderr, "\nError moving file pointer in "
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"get_line().\n");
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exit(-1);
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}
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if (fpos < file_size) { /* Not end of file yet */
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/* We've reached end of buffer, but not end of file yet,
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so read next part of file into buffer */
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if ((bytes_read =
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read(fd, buf, BUF_SIZE)) == -1) {
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endwin();
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fprintf(stderr, "\nError reading file in get_line().\n");
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exit(-1);
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}
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buf[bytes_read] = '\0';
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page = buf;
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} else {
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if (!end_reached)
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end_reached = 1;
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break;
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}
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} else if (i < MAX_LEN)
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line[i++] = *(page++);
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else {
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/* Truncate lines longer than MAX_LEN characters */
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if (i == MAX_LEN)
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line[i++] = '\0';
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page++;
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}
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}
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if (i <= MAX_LEN)
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line[i] = '\0';
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if (!end_reached)
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page++; /* move pass '\n' */
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return line;
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}
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|
/*
|
|
* 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, position_indicator_attr);
|
|
wbkgdset(win, position_indicator_attr & A_COLOR);
|
|
percent = !file_size ?
|
|
100 : ((fpos - bytes_read + page - buf) * 100) / file_size;
|
|
wmove(win, height - 3, width - 9);
|
|
wprintw(win, "(%3d%%)", percent);
|
|
}
|