vim-patch:9.0.0430: cannot use repeat() with a blob

Problem:    Cannot use repeat() with a blob.
Solution:   Implement blob repeat. (closes vim/vim#11090)

https://github.com/vim/vim/commit/375141e1f80dced9be738568a3418f65813f4a2f

Co-authored-by: Bakudankun <bakudankun@gmail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index 5da6233e38..4208c5ca46 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -5976,6 +5976,37 @@ static void f_repeat(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
     while (n-- > 0) {
       tv_list_extend(rettv->vval.v_list, argvars[0].vval.v_list, NULL);
     }
+  } else if (argvars[0].v_type == VAR_BLOB) {
+    tv_blob_alloc_ret(rettv);
+    if (argvars[0].vval.v_blob == NULL || n <= 0) {
+      return;
+    }
+
+    const int slen = argvars[0].vval.v_blob->bv_ga.ga_len;
+    const int len = (int)(slen * n);
+    if (len <= 0) {
+      return;
+    }
+
+    ga_grow(&rettv->vval.v_blob->bv_ga, len);
+
+    rettv->vval.v_blob->bv_ga.ga_len = len;
+
+    int i;
+    for (i = 0; i < slen; i++) {
+      if (tv_blob_get(argvars[0].vval.v_blob, i) != 0) {
+        break;
+      }
+    }
+
+    if (i == slen) {
+      // No need to copy since all bytes are already zero
+      return;
+    }
+
+    for (i = 0; i < n; i++) {
+      tv_blob_set_range(rettv->vval.v_blob, i * slen, (i + 1) * slen - 1, argvars);
+    }
   } else {
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;