diff options
Diffstat (limited to 'scripts/lxdialog/textbox.c')
| -rw-r--r-- | scripts/lxdialog/textbox.c | 533 |
1 files changed, 0 insertions, 533 deletions
diff --git a/scripts/lxdialog/textbox.c b/scripts/lxdialog/textbox.c deleted file mode 100644 index 77848bb..0000000 --- a/scripts/lxdialog/textbox.c +++ /dev/null @@ -1,533 +0,0 @@ -/* - * textbox.c -- implements the text box - * - * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk) - * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include "dialog.h" - -static void back_lines(int n); -static void print_page(WINDOW * win, int height, int width); -static void print_line(WINDOW * win, int row, int width); -static char *get_line(void); -static void print_position(WINDOW * win, int height, int width); - -static int hscroll, fd, file_size, bytes_read; -static int begin_reached = 1, end_reached, page_length; -static char *buf, *page; - -/* - * Display text from a file in a dialog box. - */ -int dialog_textbox(const char *title, const char *file, int height, int width) -{ - int i, x, y, cur_x, cur_y, fpos, key = 0; - int passed_end; - char search_term[MAX_LEN + 1]; - WINDOW *dialog, *text; - - search_term[0] = '\0'; /* no search term entered yet */ - - /* Open input file for reading */ - if ((fd = open(file, O_RDONLY)) == -1) { - endwin(); - fprintf(stderr, "\nCan't open input file in dialog_textbox().\n"); - exit(-1); - } - /* Get file size. Actually, 'file_size' is the real file size - 1, - since it's only the last byte offset from the beginning */ - if ((file_size = lseek(fd, 0, SEEK_END)) == -1) { - endwin(); - fprintf(stderr, "\nError getting file size in dialog_textbox().\n"); - exit(-1); - } - /* Restore file pointer to beginning of file after getting file size */ - if (lseek(fd, 0, SEEK_SET) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); - exit(-1); - } - /* Allocate space for read buffer */ - if ((buf = malloc(BUF_SIZE + 1)) == NULL) { - endwin(); - fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n"); - exit(-1); - } - if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) { - endwin(); - fprintf(stderr, "\nError reading file in dialog_textbox().\n"); - exit(-1); - } - buf[bytes_read] = '\0'; /* mark end of valid data */ - page = buf; /* page is pointer to start of page to be displayed */ - - /* center dialog box on screen */ - x = (COLS - width) / 2; - y = (LINES - height) / 2; - - draw_shadow(stdscr, y, x, height, width); - - dialog = newwin(height, width, y, x); - keypad(dialog, TRUE); - - /* Create window for text region, used for scrolling text */ - text = subwin(dialog, height - 4, width - 2, y + 1, x + 1); - wattrset(text, dialog_attr); - wbkgdset(text, dialog_attr & A_COLOR); - - keypad(text, TRUE); - - /* register the new window, along with its borders */ - draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr); - - wattrset(dialog, border_attr); - mvwaddch(dialog, height - 3, 0, ACS_LTEE); - for (i = 0; i < width - 2; i++) - waddch(dialog, ACS_HLINE); - wattrset(dialog, dialog_attr); - wbkgdset(dialog, dialog_attr & A_COLOR); - waddch(dialog, ACS_RTEE); - - print_title(dialog, title, width); - - print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE); - wnoutrefresh(dialog); - getyx(dialog, cur_y, cur_x); /* Save cursor position */ - - /* Print first page of text */ - attr_clear(text, height - 4, width - 2, dialog_attr); - print_page(text, height - 4, width - 2); - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); /* Restore cursor position */ - wrefresh(dialog); - - while ((key != ESC) && (key != '\n')) { - key = wgetch(dialog); - switch (key) { - case 'E': /* Exit */ - case 'e': - case 'X': - case 'x': - delwin(dialog); - free(buf); - close(fd); - return 0; - case 'g': /* First page */ - case KEY_HOME: - if (!begin_reached) { - begin_reached = 1; - /* First page not in buffer? */ - if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); - exit(-1); - } - if (fpos > bytes_read) { /* Yes, we have to read it in */ - if (lseek(fd, 0, SEEK_SET) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in " - "dialog_textbox().\n"); - exit(-1); - } - if ((bytes_read = - read(fd, buf, BUF_SIZE)) == -1) { - endwin(); - fprintf(stderr, "\nError reading file in dialog_textbox().\n"); - exit(-1); - } - buf[bytes_read] = '\0'; - } - page = buf; - print_page(text, height - 4, width - 2); - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); /* Restore cursor position */ - wrefresh(dialog); - } - break; - case 'G': /* Last page */ - case KEY_END: - - end_reached = 1; - /* Last page not in buffer? */ - if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); - exit(-1); - } - if (fpos < file_size) { /* Yes, we have to read it in */ - if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); - exit(-1); - } - if ((bytes_read = - read(fd, buf, BUF_SIZE)) == -1) { - endwin(); - fprintf(stderr, "\nError reading file in dialog_textbox().\n"); - exit(-1); - } - buf[bytes_read] = '\0'; - } - page = buf + bytes_read; - back_lines(height - 4); - print_page(text, height - 4, width - 2); - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); /* Restore cursor position */ - wrefresh(dialog); - break; - case 'K': /* Previous line */ - case 'k': - case KEY_UP: - if (!begin_reached) { - back_lines(page_length + 1); - - /* We don't call print_page() here but use scrolling to ensure - faster screen update. However, 'end_reached' and - 'page_length' should still be updated, and 'page' should - point to start of next page. This is done by calling - get_line() in the following 'for' loop. */ - scrollok(text, TRUE); - wscrl(text, -1); /* Scroll text region down one line */ - scrollok(text, FALSE); - page_length = 0; - passed_end = 0; - for (i = 0; i < height - 4; i++) { - if (!i) { - /* print first line of page */ - print_line(text, 0, width - 2); - wnoutrefresh(text); - } else - /* Called to update 'end_reached' and 'page' */ - get_line(); - if (!passed_end) - page_length++; - if (end_reached && !passed_end) - passed_end = 1; - } - - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); /* Restore cursor position */ - wrefresh(dialog); - } - break; - case 'B': /* Previous page */ - case 'b': - case KEY_PPAGE: - if (begin_reached) - break; - back_lines(page_length + height - 4); - print_page(text, height - 4, width - 2); - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); - wrefresh(dialog); - break; - case 'J': /* Next line */ - case 'j': - case KEY_DOWN: - if (!end_reached) { - begin_reached = 0; - scrollok(text, TRUE); - scroll(text); /* Scroll text region up one line */ - scrollok(text, FALSE); - print_line(text, height - 5, width - 2); - wnoutrefresh(text); - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); /* Restore cursor position */ - wrefresh(dialog); - } - break; - case KEY_NPAGE: /* Next page */ - case ' ': - if (end_reached) - break; - - begin_reached = 0; - print_page(text, height - 4, width - 2); - print_position(dialog, height, width); - wmove(dialog, cur_y, cur_x); - wrefresh(dialog); - break; - case '0': /* Beginning of line */ - case 'H': /* Scroll left */ - case 'h': - case KEY_LEFT: - if (hscroll <= 0) - break; - - if (key == '0') - hscroll = 0; - else - hscroll--; - /* Reprint current page to scroll horizontally */ - back_lines(page_length); - print_page(text, height - 4, width - 2); - wmove(dialog, cur_y, cur_x); - wrefresh(dialog); - break; - case 'L': /* Scroll right */ - case 'l': - case KEY_RIGHT: - if (hscroll >= MAX_LEN) - break; - hscroll++; - /* Reprint current page to scroll horizontally */ - back_lines(page_length); - print_page(text, height - 4, width - 2); - wmove(dialog, cur_y, cur_x); - wrefresh(dialog); - break; - case ESC: - break; - } - } - - delwin(dialog); - free(buf); - close(fd); - return -1; /* ESC pressed */ -} - -/* - * Go back 'n' lines in text file. Called by dialog_textbox(). - * 'page' will be updated to point to the desired line in 'buf'. - */ -static void back_lines(int n) -{ - int i, fpos; - - begin_reached = 0; - /* We have to distinguish between end_reached and !end_reached - since at end of file, the line is not ended by a '\n'. - The code inside 'if' basically does a '--page' to move one - character backward so as to skip '\n' of the previous line */ - if (!end_reached) { - /* Either beginning of buffer or beginning of file reached? */ - if (page == buf) { - if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in " - "back_lines().\n"); - exit(-1); - } - if (fpos > bytes_read) { /* Not beginning of file yet */ - /* We've reached beginning of buffer, but not beginning of - file yet, so read previous part of file into buffer. - Note that we only move backward for BUF_SIZE/2 bytes, - but not BUF_SIZE bytes to avoid re-reading again in - print_page() later */ - /* Really possible to move backward BUF_SIZE/2 bytes? */ - if (fpos < BUF_SIZE / 2 + bytes_read) { - /* No, move less then */ - if (lseek(fd, 0, SEEK_SET) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in " - "back_lines().\n"); - exit(-1); - } - page = buf + fpos - bytes_read; - } else { /* Move backward BUF_SIZE/2 bytes */ - if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer " - "in back_lines().\n"); - exit(-1); - } - page = buf + BUF_SIZE / 2; - } - if ((bytes_read = - read(fd, buf, BUF_SIZE)) == -1) { - endwin(); - fprintf(stderr, "\nError reading file in back_lines().\n"); - exit(-1); - } - buf[bytes_read] = '\0'; - } else { /* Beginning of file reached */ - begin_reached = 1; - return; - } - } - if (*(--page) != '\n') { /* '--page' here */ - /* Something's wrong... */ - endwin(); - fprintf(stderr, "\nInternal error in back_lines().\n"); - exit(-1); - } - } - /* Go back 'n' lines */ - for (i = 0; i < n; i++) - do { - if (page == buf) { - if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in back_lines().\n"); - exit(-1); - } - if (fpos > bytes_read) { - /* Really possible to move backward BUF_SIZE/2 bytes? */ - if (fpos < BUF_SIZE / 2 + bytes_read) { - /* No, move less then */ - if (lseek(fd, 0, SEEK_SET) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer " - "in back_lines().\n"); - exit(-1); - } - page = buf + fpos - bytes_read; - } else { /* Move backward BUF_SIZE/2 bytes */ - if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer" - " in back_lines().\n"); - exit(-1); - } - page = buf + BUF_SIZE / 2; - } - if ((bytes_read = - read(fd, buf, BUF_SIZE)) == -1) { - endwin(); - fprintf(stderr, "\nError reading file in " - "back_lines().\n"); - exit(-1); - } - buf[bytes_read] = '\0'; - } else { /* Beginning of file reached */ - begin_reached = 1; - return; - } - } - } while (*(--page) != '\n'); - page++; -} - -/* - * Print a new page of text. Called by dialog_textbox(). - */ -static void print_page(WINDOW * win, int height, int width) -{ - int i, passed_end = 0; - - page_length = 0; - for (i = 0; i < height; i++) { - print_line(win, i, width); - if (!passed_end) - page_length++; - if (end_reached && !passed_end) - passed_end = 1; - } - wnoutrefresh(win); -} - -/* - * Print a new line of text. Called by dialog_textbox() and print_page(). - */ -static void print_line(WINDOW * win, int row, int width) -{ - int y, x; - char *line; - - line = get_line(); - line += MIN(strlen(line), hscroll); /* Scroll horizontally */ - wmove(win, row, 0); /* move cursor to correct line */ - waddch(win, ' '); - waddnstr(win, line, MIN(strlen(line), width - 2)); - - getyx(win, y, x); - /* Clear 'residue' of previous line */ -#if OLD_NCURSES - { - int i; - for (i = 0; i < width - x; i++) - waddch(win, ' '); - } -#else - wclrtoeol(win); -#endif -} - -/* - * Return current line of text. Called by dialog_textbox() and print_line(). - * 'page' should point to start of current line before calling, and will be - * updated to point to start of next line. - */ -static char *get_line(void) -{ - int i = 0, fpos; - static char line[MAX_LEN + 1]; - - end_reached = 0; - while (*page != '\n') { - if (*page == '\0') { - /* Either end of file or end of buffer reached */ - if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in " - "get_line().\n"); - exit(-1); - } - if (fpos < file_size) { /* Not end of file yet */ - /* We've reached end of buffer, but not end of file yet, - so read next part of file into buffer */ - if ((bytes_read = - read(fd, buf, BUF_SIZE)) == -1) { - endwin(); - fprintf(stderr, "\nError reading file in get_line().\n"); - exit(-1); - } - buf[bytes_read] = '\0'; - page = buf; - } else { - if (!end_reached) - end_reached = 1; - break; - } - } else if (i < MAX_LEN) - line[i++] = *(page++); - else { - /* Truncate lines longer than MAX_LEN characters */ - if (i == MAX_LEN) - line[i++] = '\0'; - page++; - } - } - if (i <= MAX_LEN) - line[i] = '\0'; - if (!end_reached) - page++; /* move pass '\n' */ - - return line; -} - -/* - * Print current position - */ -static void print_position(WINDOW * win, int height, int width) -{ - int fpos, percent; - - if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { - endwin(); - fprintf(stderr, "\nError moving file pointer in print_position().\n"); - exit(-1); - } - wattrset(win, 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); -} |
