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Diffstat (limited to 'Build/source/utils/dialog/textbox.c')
| -rw-r--r-- | Build/source/utils/dialog/textbox.c | 709 |
1 files changed, 709 insertions, 0 deletions
diff --git a/Build/source/utils/dialog/textbox.c b/Build/source/utils/dialog/textbox.c new file mode 100644 index 00000000000..a26d9cc596c --- /dev/null +++ b/Build/source/utils/dialog/textbox.c @@ -0,0 +1,709 @@ +/* + * textbox.c -- implements the text box + * + * AUTHOR: Savio Lam (lam836@cs.cuhk.hk) + * + * 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 int get_search_term(WINDOW *win, char *search_term, int height, int width); +static void print_position(WINDOW *win, int height, int width); + + +static int hscroll = 0, fd, file_size, bytes_read, begin_reached = 1, + end_reached = 0, page_length; +static char *buf, *page; + + +/* + * Display text from a file in a dialog box. + */ +int dialog_textbox(char *title, char *file, int height, int width) +{ + int i, x, y, cur_x, cur_y, fpos, key = 0, dir, temp, temp1; +#ifdef HAVE_NCURSES + int passed_end; +#endif + char search_term[MAX_LEN+1], *tempptr, *found; + 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; + +#ifdef HAVE_NCURSES + if (use_shadow) + draw_shadow(stdscr, y, x, height, width); +#endif + dialog = newwin(height, width, y, x); + keypad(dialog, TRUE); + + /* Create window for text region, used for scrolling text */ +/* text = newwin(height-4, width-2, y+1, x+1); */ + text = subwin(dialog, height-4, width-2, y+1, x+1); + keypad(text, TRUE); + + draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr); + + wattrset(dialog, border_attr); + wmove(dialog, height-3, 0); + waddch(dialog, ACS_LTEE); + for (i = 0; i < width-2; i++) + waddch(dialog, ACS_HLINE); + wattrset(dialog, dialog_attr); + waddch(dialog, ACS_RTEE); + wmove(dialog, height-2, 1); + for (i = 0; i < width-2; i++) + waddch(dialog, ' '); + + if (title != NULL) { + wattrset(dialog, title_attr); + wmove(dialog, 0, (width - strlen(title))/2 - 1); + waddch(dialog, ' '); + waddstr(dialog, 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': + 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 */ +#ifdef HAVE_NCURSES + case KEY_END: +#endif + 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); +#ifdef HAVE_NCURSES + /* 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_line(text, 0, width-2); /* print first line of page */ + wnoutrefresh(text); + } + else + get_line(); /* Called to update 'end_reached' and 'page' */ + if (!passed_end) + page_length++; + if (end_reached && !passed_end) + passed_end = 1; + } +#else + print_page(text, height-4, width-2); +#endif + 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) { + back_lines(page_length + 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 '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); +#ifndef HAVE_NCURSES + wmove(text, height-5, 0); + waddch(text, ' '); + wmove(text, height-5, width-3); + waddch(text, ' '); +#endif + wnoutrefresh(text); + print_position(dialog, height, width); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); + } + break; + case ' ': /* Next page */ + case KEY_NPAGE: + if (!end_reached) { + begin_reached = 0; + 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 '0': /* Beginning of line */ + case 'H': /* Scroll left */ + case 'h': + case KEY_LEFT: + if (hscroll > 0) { + 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); /* Restore cursor position */ + wrefresh(dialog); + } + break; + case 'L': /* Scroll right */ + case 'l': + case KEY_RIGHT: + if (hscroll < MAX_LEN) { + hscroll++; + /* Reprint current page to scroll horizontally */ + back_lines(page_length); + print_page(text, height-4, width-2); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); + } + break; + case '/': /* Forward search */ + case 'n': /* Repeat forward search */ + case '?': /* Backward search */ + case 'N': /* Repeat backward search */ + /* set search direction */ + dir = (key == '/' || key == 'n') ? 1 : 0; + if (dir ? !end_reached : !begin_reached) { + if (key == 'n' || key == 'N') { + if (search_term[0] == '\0') { /* No search term yet */ + fprintf(stderr, "\a"); /* beep */ + break; + } + } + else /* Get search term from user */ + if (get_search_term(text, search_term, height-4, width-2) == -1) { + /* ESC pressed in get_search_term(). Reprint page to clear box */ + wattrset(text, dialog_attr); + back_lines(page_length); + print_page(text, height-4, width-2); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); + break; + } + /* Save variables for restoring in case search term can't be found */ + tempptr = page; + temp = begin_reached; + temp1 = end_reached; + if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { + endwin(); + fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); + exit(-1); + } + fpos -= bytes_read; + /* update 'page' to point to next (previous) line before + forward (backward) searching */ + back_lines(dir ? page_length-1 : page_length+1); + found = NULL; + if (dir) /* Forward search */ + while((found = strstr(get_line(), search_term)) == NULL) { + if (end_reached) + break; + } + else /* Backward search */ + while((found = strstr(get_line(), search_term)) == NULL) { + if (begin_reached) + break; + back_lines(2); + } + if (found == NULL) { /* not found */ + fprintf(stderr, "\a"); /* beep */ + /* Restore program state to that before searching */ + if (lseek(fd, fpos, 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 = tempptr; + begin_reached = temp; + end_reached = temp1; + /* move 'page' to point to start of current page in order to + re-print current page. Note that 'page' always points to + start of next page, so this is necessary */ + back_lines(page_length); + } + else /* Search term found */ + back_lines(1); + /* Reprint page */ + wattrset(text, dialog_attr); + print_page(text, height-4, width-2); + if (found != NULL) + print_position(dialog, height, width); + wmove(dialog, cur_y, cur_x); /* Restore cursor position */ + wrefresh(dialog); + } + else /* no need to find */ + fprintf(stderr, "\a"); /* beep */ + break; + case ESC: + break; + } + } + + delwin(dialog); + free(buf); + close(fd); + return -1; /* ESC pressed */ +} +/* End of dialog_textbox() */ + + +/* + * 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++; +} +/* 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; + 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 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 { + 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, char *search_term, int height, int width) +{ + int i, x, y, input_x = 0, scroll = 0, key = 0, + 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 "); + + box_width -= 2; + wmove(win, y+1, x+1); + wrefresh(win); + search_term[0] = '\0'; + wattrset(win, searchbox_attr); + while (key != ESC) { + key = wgetch(win); + switch (key) { + case '\n': + if (search_term[0] != '\0') + return 0; + break; + case KEY_BACKSPACE: + if (input_x || scroll) { + if (!input_x) { + scroll = scroll < box_width-1 ? 0 : scroll-(box_width-1); + wmove(win, y+1, x+1); + for (i = 0; i < box_width; i++) + waddch(win, search_term[scroll+input_x+i] ? + search_term[scroll+input_x+i] : ' '); + input_x = strlen(search_term) - scroll; + } + else + input_x--; + search_term[scroll+input_x] = '\0'; + wmove(win, y+1, input_x + x+1); + waddch(win, ' '); + wmove(win, y+1, input_x + x+1); + wrefresh(win); + } + break; + case ESC: + break; + default: + if (isprint(key)) + if (scroll+input_x < MAX_LEN) { + search_term[scroll+input_x] = key; + search_term[scroll+input_x+1] = '\0'; + if (input_x == box_width-1) { + scroll++; + wmove(win, y+1, x+1); + for (i = 0; i < box_width-1; i++) + waddch(win, search_term[scroll+i]); + } + else { + wmove(win, y+1, input_x++ + x+1); + waddch(win, key); + } + wrefresh(win); + } + } + } + + 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() */ |