| /* |
| * 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); |
| |
| if (title != NULL && strlen(title) >= width - 2) { |
| /* truncate long title -- mec */ |
| char *title2 = malloc(width - 2 + 1); |
| memcpy(title2, title, width - 2); |
| title2[width - 2] = '\0'; |
| title = title2; |
| } |
| |
| if (title != NULL) { |
| wattrset(dialog, title_attr); |
| mvwaddch(dialog, 0, (width - strlen(title)) / 2 - 1, ' '); |
| waddstr(dialog, (char *)title); |
| waddch(dialog, ' '); |
| } |
| 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); |
| } |