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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [scripts/] [lxdialog/] [textbox.c] - Rev 1772
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/* * 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 = 0, fd, file_size, bytes_read; static int begin_reached = 1, end_reached = 0, 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) { 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 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, ' '); waddnstr (win, line, MIN (strlen (line), width - 2)); getyx (win, y, x); /* Clear 'residue' of previous line */ #if OLD_NCURSES 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); }
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