Commit: patch 9.2.0351: repeat_string() can be improved

[Christian Brabandt]

patch 9.2.0351: repeat_string() can be improved

Commit: https://github.com/vim/vim/commit/bfa46a52f6a93cb99ec55d56ad43493d875c6dc2
Author: Yasuhiro Matsumoto <matt...@gmail.com>
Date: Wed Apr 15 04:12:55 2026 +0000

patch 9.2.0351: repeat_string() can be improved

Problem: repeat_string() can be improved
Solution: Replace the for() loop by an exponential growing while loop
(Yasuhiro Matsumoto)

closes: #19977

Signed-off-by: Yasuhiro Matsumoto <matt...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/evalfunc.c b/src/evalfunc.c
index a0fb99b73..04774128d 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -10584,7 +10584,7 @@ repeat_string(typval_T *str_tv, int n, typval_T *rettv)
int slen;
int len;
char_u *r;
- int i;
+ int done;

p = tv_get_string(str_tv);
rettv->v_type = VAR_STRING;
@@ -10599,8 +10599,17 @@ repeat_string(typval_T *str_tv, int n, typval_T *rettv)
if (r == NULL)
return;

- for (i = 0; i < n; i++)
- mch_memmove(r + i * slen, p, (size_t)slen);
+ mch_memmove(r, p, (size_t)slen);
+ done = slen;
+ while (done < len)
+ {
+ int copy_len = done;
+
+ if (copy_len > len - done)
+ copy_len = len - done;
+ mch_memmove(r + done, r, (size_t)copy_len);
+ done += copy_len;
+ }
r[len] = NUL;

rettv->vval.v_string = r;
diff --git a/src/version.c b/src/version.c
index 9aef76d65..3c64afaa9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 351,
/**/
350,
/**/