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patch 9.1.0038: Unnecessary loop in getvcol()

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Problem:  Unnecessary loop in getvcol().
Solution: Compare next char position with pos->col directly.
          (zeertzjq)

The loop below already handles end of line before checking for posptr,
and the next char is after pos->col whether pos->col is at the start or
in the middle of the char in question, so neither the NUL check nor the
mb_head_off() are needed when comparing the position of the next char
with pos->col directly.

closes: #13878

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq 2024-01-17 20:52:13 +01:00 committed by Christian Brabandt
parent 5b0722b864
commit 4ea37f88e8
No known key found for this signature in database
GPG Key ID: F3F92DA383FDDE09
2 changed files with 8 additions and 24 deletions
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30
src/charset.c
View File

@ -1493,7 +1493,6 @@ getvcol(
{
colnr_T vcol;
char_u *ptr; // points to current char
char_u *posptr; // points to char at pos->col
char_u *line; // start of the line
int incr;
int head;
@ -1509,24 +1508,6 @@ getvcol(
vcol = 0;
line = ptr = ml_get_buf(wp->w_buffer, pos->lnum, FALSE);
if (pos->col == MAXCOL)
posptr = NULL; // continue until the NUL
else
{
colnr_T i;
// In a few cases the position can be beyond the end of the line.
for (i = 0; i < pos->col; ++i)
if (ptr[i] == NUL)
{
pos->col = i;
break;
}
posptr = ptr + pos->col;
if (has_mbyte)
// always start on the first byte
posptr -= (*mb_head_off)(line, posptr);
}
init_chartabsize_arg(&cts, wp, pos->lnum, 0, line, line);
cts.cts_max_head_vcol = -1;
@ -1588,11 +1569,12 @@ getvcol(
incr = g_chartab[c] & CT_CELL_MASK;
}
if (posptr != NULL && ptr >= posptr) // character at pos->col
char_u *next_ptr = ptr + (*mb_ptr2len)(ptr);
if (next_ptr - line > pos->col) // character at pos->col
break;
vcol += incr;
MB_PTR_ADV(ptr);
ptr = next_ptr;
}
}
else
@ -1620,12 +1602,12 @@ getvcol(
wp->w_virtcol_first_char = cts.cts_first_char;
#endif
if (posptr != NULL && cts.cts_ptr >= posptr)
// character at pos->col
char_u *next_ptr = cts.cts_ptr + (*mb_ptr2len)(cts.cts_ptr);
if (next_ptr - line > pos->col) // character at pos->col
break;
cts.cts_vcol += incr;
MB_PTR_ADV(cts.cts_ptr);
cts.cts_ptr = next_ptr;
}
vcol = cts.cts_vcol;
ptr = cts.cts_ptr;

2
src/version.c
View File

@ -704,6 +704,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
38,
/**/
37,
/**/