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lineedit: fix moving backwards across lines with wide chars
function old new delta input_backward 212 208 -4 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -413,12 +413,22 @@ static void beep(void)
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bb_putchar('\007');
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}
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static void put_prompt(void)
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{
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unsigned w;
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out1str(cmdedit_prompt);
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fflush_all();
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cursor = 0;
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w = cmdedit_termw; /* read volatile var once */
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cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
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cmdedit_x = cmdedit_prmt_len % w;
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}
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/* Move back one character */
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/* (optimized for slow terminals) */
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static void input_backward(unsigned num)
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{
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int count_y;
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if (num > cursor)
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num = cursor;
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if (num == 0)
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@ -456,29 +466,44 @@ static void input_backward(unsigned num)
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}
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/* Need to go one or more lines up */
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//FIXME: this does not work correctly if prev line has one "unfilled" screen position
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//caused by wide unicode char not fitting in that one screen position.
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num -= cmdedit_x;
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{
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unsigned w = cmdedit_termw; /* volatile var */
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if (ENABLE_UNICODE_WIDE_WCHARS) {
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/* With wide chars, it is hard to "backtrack"
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* and reliably figure out where to put cursor.
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* Example (<> is a wide char; # is an ordinary char, _ cursor):
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* |prompt: <><> |
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* |<><><><><><> |
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* |_ |
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* and user presses left arrow. num = 1, cmdedit_x = 0,
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* We need to go up one line, and then - how do we know that
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* we need to go *10* positions to the right? Because
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* |prompt: <>#<>|
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* |<><><>#<><><>|
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* |_ |
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* in this situation we need to go *11* positions to the right.
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*
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* A simpler thing to do is to redraw everything from the start
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* up to new cursor position (which is already known):
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*/
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unsigned sv_cursor;
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if (cmdedit_y > 0) /* up to start y */
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printf("\033[%uA", cmdedit_y);
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bb_putchar('\r');
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cmdedit_y = 0;
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sv_cursor = cursor;
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put_prompt(); /* sets cursor to 0 */
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while (cursor < sv_cursor)
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put_cur_glyph_and_inc_cursor();
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} else {
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int count_y;
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unsigned w;
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num -= cmdedit_x;
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w = cmdedit_termw; /* read volatile var once */
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count_y = 1 + (num / w);
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cmdedit_y -= count_y;
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cmdedit_x = w * count_y - num;
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/* go to 1st column; go up; go to correct column */
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printf("\r" "\033[%uA" "\033[%uC", count_y, cmdedit_x);
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}
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/* go to 1st column; go up; go to correct column */
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printf("\r" "\033[%uA" "\033[%uC", count_y, cmdedit_x);
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}
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static void put_prompt(void)
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{
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unsigned w;
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out1str(cmdedit_prompt);
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fflush_all();
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cursor = 0;
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w = cmdedit_termw; /* read volatile var once */
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cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
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cmdedit_x = cmdedit_prmt_len % w;
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}
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/* draw prompt, editor line, and clear tail */
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