701 lines
22 KiB
C
701 lines
22 KiB
C
/*
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* textbox.c -- implements the text box
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*
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* AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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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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#include "dialog.priv.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 unsigned char *get_line(void);
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static int get_search_term(WINDOW *win, unsigned char *search_term, int height, int width);
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static void print_position(WINDOW *win, int height, int width);
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static int hscroll = 0, fd, file_size, bytes_read, begin_reached = 1,
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end_reached = 0, page_length;
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static unsigned 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(unsigned char *title, unsigned 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, dir, temp, temp1;
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#ifdef HAVE_NCURSES
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int passed_end;
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#endif
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unsigned char search_term[MAX_LEN+1], *tempptr, *found;
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WINDOW *dialog, *text;
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if (height < 0 || width < 0) {
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endwin();
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fprintf(stderr, "\nAutosizing is impossible in dialog_textbox().\n");
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exit(-1);
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}
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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 <%s>in dialog_textbox().\n", file);
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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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if (width > COLS)
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width = COLS;
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if (height > LINES)
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height = LINES;
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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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#ifdef HAVE_NCURSES
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if (use_shadow)
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draw_shadow(stdscr, y, x, height, width);
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#endif
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dialog = newwin(height, width, y, x);
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if (dialog == NULL) {
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endwin();
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fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
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exit(1);
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}
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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 = newwin(height-4, width-2, y+1, x+1); */
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text = subwin(dialog, height-4, width-2, y+1, x+1);
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if (text == NULL) {
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endwin();
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fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", height-4,width-2,y+1,x+1);
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exit(1);
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}
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keypad(text, TRUE);
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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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wmove(dialog, height-3, 0);
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waddch(dialog, 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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waddch(dialog, ACS_RTEE);
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wmove(dialog, height-2, 1);
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for (i = 0; i < width-2; i++)
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waddch(dialog, ' ');
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if (title != NULL) {
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wattrset(dialog, title_attr);
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wmove(dialog, 0, (width - strlen(title))/2 - 1);
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waddch(dialog, ' ');
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waddstr(dialog, title);
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waddch(dialog, ' ');
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}
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display_helpline(dialog, height-1, 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') && (key != '\r')) {
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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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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 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';
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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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#ifdef HAVE_NCURSES
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case KEY_END:
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#endif
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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 = 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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#ifdef HAVE_NCURSES
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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 'page_length'
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should still be updated, and 'page' should point to start of
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next page. This is done by calling get_line() in the following
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'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_line(text, 0, width-2); /* print first line of page */
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wnoutrefresh(text);
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}
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else
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get_line(); /* Called to update 'end_reached' and 'page' */
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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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#else
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print_page(text, height-4, width-2);
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#endif
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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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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); /* Restore cursor position */
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wrefresh(dialog);
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}
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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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#ifndef HAVE_NCURSES
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wmove(text, height-5, 0);
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waddch(text, ' ');
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wmove(text, height-5, width-3);
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waddch(text, ' ');
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#endif
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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 ' ': /* Next page */
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case KEY_NPAGE:
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if (!end_reached) {
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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); /* Restore cursor position */
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wrefresh(dialog);
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}
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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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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); /* Restore cursor position */
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wrefresh(dialog);
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}
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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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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); /* Restore cursor position */
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wrefresh(dialog);
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}
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break;
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case '/': /* Forward search */
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case 'n': /* Repeat forward search */
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case '?': /* Backward search */
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case 'N': /* Repeat backward search */
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/* set search direction */
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dir = (key == '/' || key == 'n') ? 1 : 0;
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if (dir ? !end_reached : !begin_reached) {
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if (key == 'n' || key == 'N') {
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if (search_term[0] == '\0') { /* No search term yet */
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fprintf(stderr, "\a"); /* beep */
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break;
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}
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}
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else /* Get search term from user */
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if (get_search_term(text, search_term, height-4, width-2) == -1) {
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/* ESC pressed in get_search_term(). Reprint page to clear box */
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wattrset(text, dialog_attr);
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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); /* Restore cursor position */
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wrefresh(dialog);
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break;
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}
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/* Save variables for restoring in case search term can't be found */
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tempptr = page;
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temp = begin_reached;
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temp1 = end_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 dialog_textbox().\n");
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exit(-1);
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}
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fpos -= bytes_read;
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/* update 'page' to point to next (previous) line before
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forward (backward) searching */
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back_lines(dir ? page_length-1 : page_length+1);
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found = NULL;
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if (dir) /* Forward search */
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while((found = strstr(get_line(), search_term)) == NULL) {
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if (end_reached)
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break;
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}
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else /* Backward search */
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while((found = strstr(get_line(), search_term)) == NULL) {
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if (begin_reached)
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break;
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back_lines(2);
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}
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if (found == NULL) { /* not found */
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fprintf(stderr, "\a"); /* beep */
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/* Restore program state to that before searching */
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if (lseek(fd, fpos, 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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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';
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page = tempptr;
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begin_reached = temp;
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end_reached = temp1;
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/* move 'page' to point to start of current page in order to
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re-print current page. Note that 'page' always points to
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start of next page, so this is necessary */
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back_lines(page_length);
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}
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else /* Search term found */
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back_lines(1);
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/* Reprint page */
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wattrset(text, dialog_attr);
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print_page(text, height-4, width-2);
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if (found != NULL)
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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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else /* no need to find */
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fprintf(stderr, "\a"); /* beep */
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break;
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case ESC:
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break;
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case KEY_F(1):
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display_helpfile();
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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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/* End of dialog_textbox() */
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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 since at end
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of file, the line is not ended by a '\n'. The code inside 'if' basically
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does a '--page' to move one character backward so as to skip '\n' of the
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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 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 file yet,
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so read previous part of file into buffer. Note that we only
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move backward for BUF_SIZE/2 bytes, but not BUF_SIZE bytes to
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avoid re-reading again in 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 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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}
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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 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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}
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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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}
|
|
|
|
/* 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++;
|
|
}
|
|
/* End of back_lines() */
|
|
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
/* End of print_page() */
|
|
|
|
|
|
/*
|
|
* Print a new line of text. Called by dialog_textbox() and print_page().
|
|
*/
|
|
static void print_line(WINDOW *win, int row, int width)
|
|
{
|
|
int i, y, x;
|
|
unsigned char *line;
|
|
|
|
line = get_line();
|
|
line += MIN(strlen(line),hscroll); /* Scroll horizontally */
|
|
wmove(win, row, 0); /* move cursor to correct line */
|
|
waddch(win,' ');
|
|
#ifdef HAVE_NCURSES
|
|
waddnstr(win, line, MIN(strlen(line),width-2));
|
|
#else
|
|
line[MIN(strlen(line),width-2)] = '\0';
|
|
waddstr(win, line);
|
|
#endif
|
|
|
|
getyx(win, y, x);
|
|
/* Clear 'residue' of previous line */
|
|
for (i = 0; i < width-x; i++)
|
|
waddch(win, ' ');
|
|
}
|
|
/* End of print_line() */
|
|
|
|
|
|
/*
|
|
* 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 unsigned char *get_line(void)
|
|
{
|
|
int i = 0, fpos;
|
|
static unsigned 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 {
|
|
if (i == MAX_LEN) /* Truncate lines longer than MAX_LEN characters */
|
|
line[i++] = '\0';
|
|
page++;
|
|
}
|
|
}
|
|
if (i <= MAX_LEN)
|
|
line[i] = '\0';
|
|
if (!end_reached)
|
|
page++; /* move pass '\n' */
|
|
|
|
return line;
|
|
}
|
|
/* End of get_line() */
|
|
|
|
|
|
/*
|
|
* Display a dialog box and get the search term from user
|
|
*/
|
|
static int get_search_term(WINDOW *win, unsigned char *search_term, int height, int width)
|
|
{
|
|
int x, y, key = 0, first,
|
|
box_height = 3, box_width = 30;
|
|
|
|
x = (width - box_width)/2;
|
|
y = (height - box_height)/2;
|
|
#ifdef HAVE_NCURSES
|
|
if (use_shadow)
|
|
draw_shadow(win, y, x, box_height, box_width);
|
|
#endif
|
|
draw_box(win, y, x, box_height, box_width, dialog_attr, searchbox_border_attr);
|
|
wattrset(win, searchbox_title_attr);
|
|
wmove(win, y, x+box_width/2-4);
|
|
waddstr(win, " Search ");
|
|
wattrset(win, dialog_attr);
|
|
|
|
box_width -= 2;
|
|
search_term[0] = '\0';
|
|
|
|
first = 1;
|
|
while (key != ESC) {
|
|
key = line_edit(win, y+1, x+1, -1, box_width, searchbox_attr, first, search_term);
|
|
first = 0;
|
|
switch (key) {
|
|
case '\n':
|
|
if (search_term[0] != '\0')
|
|
return 0;
|
|
break;
|
|
case ESC:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return -1; /* ESC pressed */
|
|
}
|
|
/* End of get_search_term() */
|
|
|
|
|
|
/*
|
|
* 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);
|
|
percent = !file_size ? 100 : ((fpos-bytes_read+page-buf)*100)/file_size;
|
|
wmove(win, height-3, width-9);
|
|
wprintw(win, "(%3d%%)", percent);
|
|
}
|
|
/* End of print_position() */
|