xref: /aosp_15_r20/external/grpc-grpc/third_party/upb/upb/reflection/internal/strdup2.c (revision cc02d7e222339f7a4f6ba5f422e6413f4bd931f2)
1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2023 Google LLC.  All rights reserved.
3 //
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file or at
6 // https://developers.google.com/open-source/licenses/bsd
7 
8 #include "upb/reflection/internal/strdup2.h"
9 
10 #include <string.h>
11 
12 #include "upb/mem/arena.h"
13 
14 // Must be last.
15 #include "upb/port/def.inc"
16 
upb_strdup2(const char * s,size_t len,upb_Arena * a)17 char* upb_strdup2(const char* s, size_t len, upb_Arena* a) {
18   size_t n;
19   char* p;
20 
21   // Prevent overflow errors.
22   if (len == SIZE_MAX) return NULL;
23 
24   // Always null-terminate, even if binary data; but don't rely on the input to
25   // have a null-terminating byte since it may be a raw binary buffer.
26   n = len + 1;
27   p = upb_Arena_Malloc(a, n);
28   if (p) {
29     if (len != 0) memcpy(p, s, len);
30     p[len] = 0;
31   }
32   return p;
33 }
34