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lineedit: fix insertion deep inside line (*several lines* before end)

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function                                             old     new   delta
input_backward                                       212     229     +17

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-05-17 12:30:44 +02:00
parent 786cce1871
commit 1118d9b213
1 changed files with 15 additions and 8 deletions
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23
libbb/lineedit.c
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@ -486,15 +486,22 @@ static void input_backward(unsigned num)
while (cursor < sv_cursor)
put_cur_glyph_and_inc_cursor();
} else {
int count_y;
unsigned w;
int lines_up;
unsigned width;
/* num = chars to go back from the beginning of current line: */
num -= cmdedit_x;
w = cmdedit_termw; /* read volatile var once */
count_y = 1 + (num / w);
cmdedit_y -= count_y;
cmdedit_x = w * count_y - num;
/* go to 1st column; go up; go to correct column */
printf("\r" "\033[%uA" "\033[%uC", count_y, cmdedit_x);
width = cmdedit_termw; /* read volatile var once */
/* num=1...w: one line up, w+1...2w: two, etc: */
lines_up = 1 + (num - 1) / width;
cmdedit_x = (width * cmdedit_y - num) % width;
cmdedit_y -= lines_up;
/* go to 1st column; go up */
printf("\r" "\033[%uA", lines_up);
/* go to correct column.
* xtarm, konsole, Linux VT interpret 0 as 1 below! wow.
* Need to *make sure* we skip it if cmdedit_x == 0 */
if (cmdedit_x)
printf("\033[%uC", cmdedit_x);
}
}