From 8d220356f2c40b05a633d4e9e829cec92dbdf417 Mon Sep 17 00:00:00 2001
From: VaclavT <vaclavt@gmail.com>
Date: Fri, 6 Aug 2021 22:47:42 +0200
Subject: [PATCH] do not reallocate memory so often

---
 clib/linenoise.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/clib/linenoise.c b/clib/linenoise.c
index 80b3821..af16d4f 100644
--- a/clib/linenoise.c
+++ b/clib/linenoise.c
@@ -465,20 +465,28 @@ void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
 struct abuf {
     char *b;
     int len;
+    int alloc_len;
 };
 
 static void abInit(struct abuf *ab) {
     ab->b = NULL;
     ab->len = 0;
+    ab->alloc_len = 0;
 }
 
 static void abAppend(struct abuf *ab, const char *s, int len) {
-    char *new = realloc(ab->b,ab->len+len);
+    if ( ab->alloc_len > ab->len+len) {
+        memcpy(ab->b+ab->len,s,len);
+        ab->len += len;
+    } else {
+        char *new = realloc(ab->b,ab->len+len+32);
 
-    if (new == NULL) return;
-    memcpy(new+ab->len,s,len);
-    ab->b = new;
-    ab->len += len;
+        if (new == NULL) return;
+        memcpy(new+ab->len,s,len);
+        ab->b = new;
+        ab->len += len;
+        ab->alloc_len = ab->len+32;
+    }
 }
 
 static void abFree(struct abuf *ab) {