/* Delete COUNT characters in BUF. */
void cl_delete (int count)
{
grub_memmove (buf + lpos, buf + lpos + count, llen - count + 1);
llen -= count;
if (xpos + llen + count - lpos > CMDLINE_WIDTH)
cl_refresh (0, CMDLINE_WIDTH - xpos);
else
cl_refresh (0, llen + count - lpos);
}
/* Move the cursor forward. */
void cl_forward (int count)
{
lpos += count;
/* If the cursor goes outside, scroll the screen to the right. */
if (xpos + count >= CMDLINE_WIDTH)
cl_refresh (1, 0);
else
{
xpos += count;
if (current_term->flags & TERM_DUMB)
{
int i;
for (i = lpos - count; i < lpos; i++)
{
if (! echo_char)
grub_putchar (buf[i]);
else
grub_putchar (echo_char);
}
}
else
gotoxy (xpos, getxy () & 0xFF);
}
}
/* Initialize the command-line. */
void cl_init (void)
{
/* Distinguish us from other lines and error messages! */
grub_putchar ('\n');
/* Print full line and set position here. */
cl_refresh (1, 0);
}
/* Insert STR to BUF. */
void cl_insert (const char *str)
{
int l = grub_strlen (str);
if (llen + l < maxlen)
{
if (lpos == llen)
grub_memmove (buf + lpos, str, l + 1);
else
{
grub_memmove (buf + lpos + l, buf + lpos, llen - lpos + 1);
grub_memmove (buf + lpos, str, l);
}
llen += l;
lpos += l;
if (xpos + l >= CMDLINE_WIDTH)
cl_refresh (1, 0);
else if (xpos + l + llen - lpos > CMDLINE_WIDTH)
cl_refresh (0, CMDLINE_WIDTH - xpos);
else
cl_refresh (0, l + llen - lpos);
}
}
/*
* cl_suspend --
* Suspend a screen.
*
* PUBLIC: int cl_suspend __P((SCR *, int *));
*/
int
cl_suspend(SCR *sp, int *allowedp)
{
struct termios t;
CL_PRIVATE *clp;
WINDOW *win;
size_t y, x;
int changed;
clp = CLP(sp);
win = CLSP(sp) ? CLSP(sp) : stdscr;
*allowedp = 1;
/*
* The ex implementation of this function isn't needed by screens not
* supporting ex commands that require full terminal canonical mode
* (e.g. :suspend).
*
* The vi implementation of this function isn't needed by screens not
* supporting vi process suspension, i.e. any screen that isn't backed
* by a UNIX shell.
*
* Setting allowedp to 0 will cause the editor to reject the command.
*/
if (F_ISSET(sp, SC_EX)) {
/* Save the terminal settings, and restore the original ones. */
if (F_ISSET(clp, CL_STDIN_TTY)) {
(void)tcgetattr(STDIN_FILENO, &t);
(void)tcsetattr(STDIN_FILENO,
TCSASOFT | TCSADRAIN, &clp->orig);
}
/* Stop the process group. */
(void)kill(0, SIGTSTP);
/* Time passes ... */
/* Restore terminal settings. */
if (F_ISSET(clp, CL_STDIN_TTY))
(void)tcsetattr(STDIN_FILENO, TCSASOFT | TCSADRAIN, &t);
return (0);
}
/*
* Move to the lower left-hand corner of the screen.
*
* XXX
* Not sure this is necessary in System V implementations, but it
* shouldn't hurt.
*/
getyx(win, y, x);
(void)wmove(win, LINES - 1, 0);
(void)wrefresh(win);
/*
* Temporarily end the screen. System V introduced a semantic where
* endwin() could be restarted. We use it because restarting curses
* from scratch often fails in System V. 4BSD curses didn't support
* restarting after endwin(), so we have to do what clean up we can
* without calling it.
*/
/* Save the terminal settings. */
(void)tcgetattr(STDIN_FILENO, &t);
/* Restore the cursor keys to normal mode. */
(void)keypad(stdscr, FALSE);
/* Restore the window name. */
(void)cl_rename(sp, NULL, 0);
#ifdef HAVE_BSD_CURSES
(void)cl_attr(sp, SA_ALTERNATE, 0);
#else
(void)endwin();
#endif
/*
* XXX
* Restore the original terminal settings. This is bad -- the
* reset can cause character loss from the tty queue. However,
* we can't call endwin() in BSD curses implementations, and too
* many System V curses implementations don't get it right.
*/
(void)tcsetattr(STDIN_FILENO, TCSADRAIN | TCSASOFT, &clp->orig);
/* Stop the process group. */
(void)kill(0, SIGTSTP);
/* Time passes ... */
/*
* If we received a killer signal, we're done. Leave everything
* unchanged. In addition, the terminal has already been reset
* correctly, so leave it alone.
*/
if (clp->killersig) {
F_CLR(clp, CL_SCR_EX_INIT | CL_SCR_VI_INIT);
return (0);
}
/* Restore terminal settings. */
wrefresh(win); /* Needed on SunOs/Solaris ? */
if (F_ISSET(clp, CL_STDIN_TTY))
(void)tcsetattr(STDIN_FILENO, TCSASOFT | TCSADRAIN, &t);
#ifdef HAVE_BSD_CURSES
(void)cl_attr(sp, SA_ALTERNATE, 1);
#endif
/* Set the window name. */
(void)cl_rename(sp, sp->frp->name, 1);
/* Put the cursor keys into application mode. */
(void)keypad(stdscr, TRUE);
/* Refresh and repaint the screen. */
(void)wmove(win, y, x);
(void)cl_refresh(sp, 1);
/* If the screen changed size, set the SIGWINCH bit. */
if (cl_ssize(sp, 1, NULL, NULL, &changed))
return (1);
if (changed)
F_SET(CLP(sp), CL_SIGWINCH);
return (0);
}
static int
real_get_cmdline (char *prompt, char *cmdline, int maxlen,
int echo_char, int readline)
{
/* This is a rather complicated function. So explain the concept.
A command-line consists of ``section''s. A section is a part of the
line which may be displayed on the screen, but a section is never
displayed with another section simultaneously.
Each section is basically 77 or less characters, but the exception
is the first section, which is 78 or less characters, because the
starting point is special. See below.
The first section contains a prompt and a command-line (or the
first part of a command-line when it is too long to be fit in the
screen). So, in the first section, the number of command-line
characters displayed is 78 minus the length of the prompt (or
less). If the command-line has more characters, `>' is put at the
position 78 (zero-origin), to inform the user of the hidden
characters.
Other sections always have `<' at the first position, since there
is absolutely a section before each section. If there is a section
after another section, this section consists of 77 characters and
`>' at the last position. The last section has 77 or less
characters and doesn't have `>'.
Each section other than the last shares some characters with the
previous section. This region is called ``margin''. If the cursor
is put at the magin which is shared by the first section and the
second, the first section is displayed. Otherwise, a displayed
section is switched to another section, only if the cursor is put
outside that section. */
/* XXX: These should be defined in shared.h, but I leave these here,
until this code is freezed. */
#define CMDLINE_WIDTH 78
#define CMDLINE_MARGIN 10
int xpos, lpos, c, section;
/* The length of PROMPT. */
int plen;
/* The length of the command-line. */
int llen;
/* The index for the history. */
int history = -1;
/* The working buffer for the command-line. */
char *buf = (char *) CMDLINE_BUF;
/* The kill buffer. */
char *kill_buf = (char *) KILL_BUF;
/* Nested function definitions for code simplicity. */
/* The forward declarations of nested functions are prefixed
with `auto'. */
auto void cl_refresh (int full, int len);
auto void cl_backward (int count);
auto void cl_forward (int count);
auto void cl_insert (const char *str);
auto void cl_delete (int count);
auto void cl_init (void);
/* Move the cursor backward. */
void cl_backward (int count)
{
lpos -= count;
/* If the cursor is in the first section, display the first section
instead of the second. */
if (section == 1 && plen + lpos < CMDLINE_WIDTH)
cl_refresh (1, 0);
else if (xpos - count < 1)
cl_refresh (1, 0);
else
{
xpos -= count;
if (current_term->flags & TERM_DUMB)
{
int i;
for (i = 0; i < count; i++)
grub_putchar ('\b');
}
else
gotoxy (xpos, getxy () & 0xFF);
}
}