dec69da856
Readability are more important then the 80 coloumn limit, so fold several lines to greatly improve readability. Also keep return type on same line as function definition. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
546 lines
15 KiB
C
546 lines
15 KiB
C
/*
|
|
* 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);
|
|
}
|