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vi: discover window size even on serial consoles. optional

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function                                             old     new   delta
edit_file                                            671     761     +90
wh_helper                                              -      57     +57
query_screen_dimensions                               54      63      +9
ar_main                                              533     542      +9
refresh                                              767     773      +6
vi_main                                              242     243      +1
text_yank                                             56      54      -2
get_terminal_width_height                            180     135     -45
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 5/2 up/down: 172/-47)           Total: 125 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-04-18 22:09:30 -07:00
parent def4783a8a
commit c175c46647
4 changed files with 64 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
editors/Config.in
View File

@ -168,6 +168,18 @@ config FEATURE_VI_WIN_RESIZE
help
Make busybox vi behave nicely with terminals that get resized.
config FEATURE_VI_ASK_TERMINAL
bool "Use 'tell me cursor position' ESC sequence to measure window"
default n
depends on VI
help
If terminal size can't be retrieved and $LINES/$COLUMNS are not set,
this option makes vi perform a last-ditch effort to find it:
vi positions cursor to 999,999 and asks terminal to report real
cursor position using "ESC [ 6 n" escape sequence, then reads stdin.
This is not clean but helps a lot on serial lines and such.
config FEATURE_VI_OPTIMIZE_CURSOR
bool "Optimize cursor movement"
default y

21
editors/vi.c
View File

@ -138,6 +138,9 @@ struct globals {
int save_argc; // how many file names on cmd line
int cmdcnt; // repetition count
unsigned rows, columns; // the terminal screen is this size
#if ENABLE_FEATURE_VI_ASK_TERMINAL
int get_rowcol_error;
#endif
int crow, ccol; // cursor is on Crow x Ccol
int offset; // chars scrolled off the screen to the left
int have_status_msg; // is default edit status needed?
@ -503,6 +506,10 @@ static int init_text_buffer(char *fn)
#if ENABLE_FEATURE_VI_WIN_RESIZE
static void query_screen_dimensions(void)
{
# if ENABLE_FEATURE_VI_ASK_TERMINAL
if (!G.get_rowcol_error)
G.get_rowcol_error =
# endif
get_terminal_width_height(STDIN_FILENO, &columns, &rows);
if (rows > MAX_SCR_ROWS)
rows = MAX_SCR_ROWS;
@ -530,6 +537,20 @@ static void edit_file(char *fn)
columns = 80;
size = 0;
query_screen_dimensions();
#if ENABLE_FEATURE_VI_ASK_TERMINAL
if (G.get_rowcol_error /* TODO? && no input on stdin */) {
uint64_t k;
write1("\033[999;999H" "\033[6n");
fflush_all();
k = read_key(STDIN_FILENO, readbuffer, /*timeout_ms:*/ 100);
if ((int32_t)k == KEYCODE_CURSOR_POS) {
uint32_t rc = (k >> 32);
columns = (rc & 0x7fff);
rows = ((rc >> 16) & 0x7fff);
}
query_screen_dimensions();
}
#endif
new_screen(rows, columns); // get memory for virtual screen
init_text_buffer(fn);

2
libbb/read_key.c
View File

@ -214,7 +214,7 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
}
n++;
/* Try to decipher "ESC [ NNN ; NNN R" sequence */
if (ENABLE_FEATURE_EDITING_ASK_TERMINAL
if ((ENABLE_FEATURE_EDITING_ASK_TERMINAL || ENABLE_FEATURE_VI_ASK_TERMINAL)
&& n >= 5
&& buffer[0] == '['
&& buffer[n-1] == 'R'

52
libbb/xfuncs.c
View File

@ -210,34 +210,40 @@ char* FAST_FUNC xmalloc_ttyname(int fd)
return buf;
}
static int wh_helper(int value, int def_val, const char *env_name, int *err)
{
if (value == 0) {
char *s = getenv(env_name);
if (s) {
value = atoi(s);
/* If LINES/COLUMNS are set, pretent that there is
* no error getting w/h, this prevents some ugly
* cursor tricks by our callers */
*err = 0;
}
}
if (value <= 1 || value >= 30000)
value = def_val;
return value;
}
/* It is perfectly ok to pass in a NULL for either width or for
* height, in which case that value will not be set. */
int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
{
struct winsize win = { 0, 0, 0, 0 };
int ret = ioctl(fd, TIOCGWINSZ, &win);
struct winsize win;
int err;
if (height) {
if (!win.ws_row) {
char *s = getenv("LINES");
if (s) win.ws_row = atoi(s);
}
if (win.ws_row <= 1 || win.ws_row >= 30000)
win.ws_row = 24;
*height = (int) win.ws_row;
}
if (width) {
if (!win.ws_col) {
char *s = getenv("COLUMNS");
if (s) win.ws_col = atoi(s);
}
if (win.ws_col <= 1 || win.ws_col >= 30000)
win.ws_col = 80;
*width = (int) win.ws_col;
}
return ret;
win.ws_row = 0;
win.ws_col = 0;
/* I've seen ioctl returning 0, but row/col is (still?) 0.
* We treat that as an error too. */
err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
if (height)
*height = wh_helper(win.ws_row, 24, "LINES", &err);
if (width)
*width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
return err;
}
int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)