From b07795a0397aa0c816e948e3981efe722a75a2b8 Mon Sep 17 00:00:00 2001
From: Alexander Vdolainen <alex@vapaa.xyz>
Date: Wed, 3 Dec 2025 02:12:20 +0200
Subject: [PATCH] fixed NREA write functions; made them aware about non-realloc
 buffer;

---
 ndbuf.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/ndbuf.c b/ndbuf.c
index 89ac862..32b1454 100644
--- a/ndbuf.c
+++ b/ndbuf.c
@@ -283,12 +283,23 @@ static int __rdb_grow(ndbuf_t *b, uint32_t len)
   return 0;
 }
 
+static inline int __ndbuf_is_ro(ndbuf_t *b)
+{
+  return (b->flags & NDBUF_RORB) ? 1 : 0;
+}
+
+static inline int __ndbuf_is_nrea(ndbuf_t *b)
+{
+  return (b->flags & NDBUF_NREA) ? 1 : 0;
+}
+
 /* write different types, should return the size of the
  * written data, otherwise error occurs */
 uint32_t ndbuf_write_u8(ndbuf_t *b, uint8_t u)
 {
   if(!b || !b->raw) return 0;
   if(b->ulength == b->rlength) {
+    if(__ndbuf_is_nrea(b)) return 0; /* non reallocatable buffer */
     if(__rdb_grow(b, sizeof(uint8_t))) return 0;
   }
 
@@ -302,6 +313,7 @@ uint32_t ndbuf_write_u16(ndbuf_t *b, uint16_t uu)
 {
   if(!b || !b->raw) return 0;
   if(b->ulength + sizeof(uint16_t) >= b->rlength) {
+    if(__ndbuf_is_nrea(b)) return 0; /* non reallocatable buffer */
     if(__rdb_grow(b, sizeof(uint16_t))) return 0;
   }
 
@@ -315,6 +327,7 @@ uint32_t ndbuf_write_u32(ndbuf_t *b, uint32_t uu)
 {
   if(!b || !b->raw) return 0;
   if(b->ulength + sizeof(uint32_t) >= b->rlength) {
+    if(__ndbuf_is_nrea(b)) return 0; /* non reallocatable buffer */
     if(__rdb_grow(b, sizeof(uint32_t))) return 0;
   }
 
@@ -328,6 +341,7 @@ uint32_t ndbuf_write_u64(ndbuf_t *b, uint64_t uu)
 {
   if(!b || !b->raw) return 0;
   if(b->ulength + sizeof(uint64_t) >= b->rlength) {
+    if(__ndbuf_is_nrea(b)) return 0; /* non reallocatable buffer */
     if(__rdb_grow(b, sizeof(uint64_t))) return 0;
   }
 
@@ -337,16 +351,6 @@ uint32_t ndbuf_write_u64(ndbuf_t *b, uint64_t uu)
   return sizeof(uint64_t);
 }
 
-static inline int __ndbuf_is_ro(ndbuf_t *b)
-{
-  return (b->flags & NDBUF_RORB) ? 1 : 0;
-}
-
-static inline int __ndbuf_is_nrea(ndbuf_t *b)
-{
-  return (b->flags & NDBUF_NREA) ? 1 : 0;
-}
-
 /* write raw data with the given length */
 uint32_t ndbuf_write_raw(ndbuf_t *b, void *wi, uint32_t len)
 {