Avoid unhelpful -Werror=stringop-truncation

...emitted at least by recent GCC 11 trunk (even with --disable-optimized, where
optimization level traditionally has some impact on what warnings of this kind
are emitted exactly):

> tools/source/misc/json_writer.cxx: In member function ‘tools::ScopedJsonWriterNode tools::JsonWriter::startNode(const char*)’:
> tools/source/misc/json_writer.cxx:42:12: error: ‘char* strncpy(char*, const char*, size_t)’ output truncated before terminating nul copying 5 bytes from a string of the same length [-Werror=stringop-truncation]
>    42 |     strncpy(mPos, "\": { ", 5);
>       |     ~~~~~~~^~~~~~~~~~~~~~~~~~~

etc.

Change-Id: Id96964b178b61879cf2373c5b418f5c9df4a226f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/96593
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Reviewed-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Jenkins

1 files changed, 5 insertions, 5 deletions

diff --git a/tools/source/misc/json_writer.cxx b/tools/source/misc/json_writer.cxx
index a233381038c4..12ff5eb37641 100644
--- a/tools/source/misc/json_writer.cxx
+++ b/tools/source/misc/json_writer.cxx
@@ -39,7 +39,7 @@ ScopedJsonWriterNode JsonWriter::startNode(const char* pNodeName)
     ++mPos;
     memcpy(mPos, pNodeName, len);
     mPos += len;
-    strncpy(mPos, "\": { ", 5);
+    memcpy(mPos, "\": { ", 5);
     mPos += 5;
     mStartNodeCount++;
     mbFirstFieldInNode = true;
@@ -66,7 +66,7 @@ void JsonWriter::put(const char* pPropName, const OUString& rPropVal)
     ++mPos;
     memcpy(mPos, pPropName, nPropNameLength);
     mPos += nPropNameLength;
-    strncpy(mPos, "\": \"", 4);
+    memcpy(mPos, "\": \"", 4);
     mPos += 4;
 
     // Convert from UTF-16 to UTF-8 and perform escaping
@@ -125,7 +125,7 @@ void JsonWriter::put(const char* pPropName, const OString& rPropVal)
     ++mPos;
     memcpy(mPos, pPropName, nPropNameLength);
     mPos += nPropNameLength;
-    strncpy(mPos, "\": \"", 4);
+    memcpy(mPos, "\": \"", 4);
     mPos += 4;
 
     // copy and perform escaping
@@ -169,7 +169,7 @@ void JsonWriter::put(const char* pPropName, const char* pPropVal)
     ++mPos;
     memcpy(mPos, pPropName, nPropNameLength);
     mPos += nPropNameLength;
-    strncpy(mPos, "\": \"", 4);
+    memcpy(mPos, "\": \"", 4);
     mPos += 4;
 
     // copy and perform escaping
@@ -215,7 +215,7 @@ void JsonWriter::put(const char* pPropName, int nPropVal)
     ++mPos;
     memcpy(mPos, pPropName, nPropNameLength);
     mPos += nPropNameLength;
-    strncpy(mPos, "\": ", 3);
+    memcpy(mPos, "\": ", 3);
     mPos += 3;
 
     mPos += sprintf(mPos, "%d", nPropVal);