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@@ -0,0 +1,556 @@
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+/*
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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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+
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+#include "dialog.h"
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+
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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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+
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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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+/*
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+ * Display text from a file in a dialog box.
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+ */
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+int
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+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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+
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+ search_term[0] = '\0'; /* no search term entered yet */
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+
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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,
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+ "\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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+
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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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+
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+
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+ draw_shadow (stdscr, y, x, height, width);
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+
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+ dialog = newwin (height, width, y, x);
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+ keypad (dialog, TRUE);
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+
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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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+
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+ keypad (text, TRUE);
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+
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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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+
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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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+
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+ if (title != NULL && strlen(title) >= width-2 ) {
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+ /* truncate long title -- mec */
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+ char * title2 = malloc(width-2+1);
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+ memcpy( title2, title, width-2 );
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+ title2[width-2] = '\0';
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+ title = title2;
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+ }
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+
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+ if (title != NULL) {
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+ wattrset (dialog, title_attr);
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+ mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
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+ waddstr (dialog, (char *)title);
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+ waddch (dialog, ' ');
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+ }
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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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+
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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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+
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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,
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+ "\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 = read (fd, buf, BUF_SIZE)) == -1) {
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+ endwin ();
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+ fprintf (stderr,
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+ "\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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+
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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,
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+ "\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,
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+ "\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 = read (fd, buf, BUF_SIZE)) == -1) {
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+ endwin ();
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+ fprintf (stderr,
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+ "\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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+
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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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+
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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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+
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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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+
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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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+
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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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+/*
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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
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+back_lines (int n)
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+{
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+ int i, fpos;
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+
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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)
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+ == -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 = 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,
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+ "\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) {
|
|
|
+ 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, 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);
|
|
|
+}
|