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patch 9.0.1717: virtcol2col returns last byte of a multi-byte char

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Problem: virtcol2col returns last byte of a multi-byte char
Solution: Make it return the first byte for a multi-byte char

closes: #12786
closes: #12799

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
This commit is contained in:
Yegappan Lakshmanan
2023-08-15 23:01:44 +02:00
committed by Christian Brabandt
parent 15a0a0281a
commit b209b86e66
4 changed files with 34 additions and 1 deletions
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21
src/move.c
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@@ -1556,6 +1556,25 @@ f_screenpos(typval_T *argvars UNUSED, typval_T *rettv)
dict_add_number(dict, "endcol", ecol);
}
/*
* Convert a virtual (screen) column to a character column. The first column
* is one. For a multibyte character, the column number of the first byte is
* returned.
*/
static int
virtcol2col(win_T *wp, linenr_T lnum, int vcol)
{
int offset = vcol2col(wp, lnum, vcol);
char_u *line = ml_get_buf(wp->w_buffer, lnum, FALSE);
char_u *p = line + offset;
// For a multibyte character, need to return the column number of the first
// byte.
MB_PTR_BACK(line, p);
return (int)(p - line + 1);
}
/*
* "virtcol2col({winid}, {lnum}, {col})" function
*/
@@ -1586,7 +1605,7 @@ f_virtcol2col(typval_T *argvars UNUSED, typval_T *rettv)
if (error || screencol < 0)
return;
rettv->vval.v_number = vcol2col(wp, lnum, screencol);
rettv->vval.v_number = virtcol2col(wp, lnum, screencol);
}
#endif