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Diffstat (limited to 'Build/source/utils/dialog/textbox.c')
-rw-r--r--Build/source/utils/dialog/textbox.c709
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() */