+++ /dev/null
-/*
- * 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);
-}
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