static bool perform_search(MY_OBJ * obj, int height, int width, int key, char *search_term) { int dir; long tempinx; long fpos; int result; bool found; bool temp, temp1; bool moved = FALSE; /* set search direction */ dir = (key == '/' || key == 'n') ? 1 : 0; if (dir ? !obj->end_reached : !obj->begin_reached) { if (key == 'n' || key == 'N') { if (search_term[0] == '\0') { /* No search term yet */ (void) beep(); return FALSE; } /* Get search term from user */ } else if ((result = get_search_term(obj->text, search_term, PAGE_LENGTH, PAGE_WIDTH)) != DLG_EXIT_OK || search_term[0] == '\0') { #ifdef KEY_RESIZE if (result == DLG_EXIT_CANCEL) { ungetch(key); ungetch(KEY_RESIZE); /* FALLTHRU */ } #endif /* ESC pressed, or no search term, reprint page to clear box */ (void) wattrset(obj->text, dialog_attr); back_lines(obj, obj->page_length); return TRUE; } /* Save variables for restoring in case search term can't be found */ tempinx = obj->in_buf; temp = obj->begin_reached; temp1 = obj->end_reached; fpos = ftell_obj(obj) - obj->fd_bytes_read; /* update 'in_buf' to point to next (previous) line before forward (backward) searching */ back_lines(obj, (dir ? obj->page_length - 1 : obj->page_length + 1)); if (dir) { /* Forward search */ while ((found = match_string(obj, search_term)) == FALSE) { if (obj->end_reached) break; } } else { /* Backward search */ while ((found = match_string(obj, search_term)) == FALSE) { if (obj->begin_reached) break; back_lines(obj, 2L); } } if (found == FALSE) { /* not found */ (void) beep(); /* Restore program state to that before searching */ lseek_set(obj, fpos); read_high(obj, BUF_SIZE); obj->in_buf = tempinx; obj->begin_reached = temp; obj->end_reached = temp1; /* move 'in_buf' to point to start of current page to * re-print current page. Note that 'in_buf' always points * to start of next page, so this is necessary */ back_lines(obj, obj->page_length); } else { /* Search term found */ back_lines(obj, 1L); } /* Reprint page */ (void) wattrset(obj->text, dialog_attr); moved = TRUE; } else { /* no need to find */ (void) beep(); } return moved; }
/* * 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, dir, temp, temp1; #ifdef HAVE_LIBNCURSES 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_LIBNCURSES if (use_shadow) draw_shadow (stdscr, y, x, height, width); #endif dialog = newwin (height, width, y, x); mouse_setbase (x, y); keypad (dialog, TRUE); /* Create window for text region, used for scrolling text */ text = subwin (dialog, height - 4, width - 2, y + 1, x + 1); keypad (text, TRUE); /* register the new window, along with its borders */ mouse_mkbigregion (0, 0, height - 2, width, 1, 0, 2 /* not normal */ ); 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 = mouse_wgetch (dialog); switch (key) { case M_EVENT + 'E': 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_LIBNCURSES 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_LIBNCURSES /* 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; } #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) 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); #ifndef HAVE_LIBNCURSES 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) 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 '/': /* 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); 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 */ }