Avoid -Werror=format-{overflow,truncation}=

...as emitted by at least GCC 8.2 with --enable-optimized, by making the buffers
large enough for the (hypothetical) largest values of the various date/time
components

Reviewed-on: https://gerrit.libreoffice.org/66618
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
(cherry picked from commit 113536e974d7ebbbc484b0ef40406f9b4d14e511)

Change-Id: I82e9b08fa099546b2d6f29c702e1440df9e6c6e0

5 files changed, 23 insertions, 18 deletions

diff --git a/connectivity/source/drivers/dbase/DTable.cxx b/connectivity/source/drivers/dbase/DTable.cxx
index 22d9f441b1f0..80fbebc6d608 100644
--- a/connectivity/source/drivers/dbase/DTable.cxx
+++ b/connectivity/source/drivers/dbase/DTable.cxx
@@ -1827,16 +1827,17 @@ bool ODbaseTable::UpdateBuffer(OValueRefVector& rRow, const OValueRefRow& pOrgRo
                         aDate = ::dbtools::DBTypeConversion::toDate(thisColVal.getDouble());
                     else
                         aDate = thisColVal;
-                    char s[9];
+                    char s[sizeof("-327686553565535")];
+                        // reserve enough space for hypothetical max length
                     snprintf(s,
                         sizeof(s),
                         "%04d%02d%02d",
-                        (int)aDate.Year,
-                        (int)aDate.Month,
-                        (int)aDate.Day);
+                        static_cast<sal_Int32>(aDate.Year),
+                        static_cast<sal_uInt32>(aDate.Month),
+                        static_cast<sal_uInt32>(aDate.Day));
 
-                    // Exactly 8 bytes to copy:
-                    strncpy(pData,s,sizeof s - 1);
+                    // Exactly 8 bytes to copy (even if s could hypothetically be longer):
+                    memcpy(pData,s,8);
                 } break;
                 case DataType::INTEGER:
                     {
diff --git a/connectivity/source/drivers/jdbc/ConnectionLog.cxx b/connectivity/source/drivers/jdbc/ConnectionLog.cxx
index 3218c0dc2bdc..a8abf0d82e8a 100644
--- a/connectivity/source/drivers/jdbc/ConnectionLog.cxx
+++ b/connectivity/source/drivers/jdbc/ConnectionLog.cxx
@@ -98,11 +98,12 @@ namespace comphelper { namespace log { namespace convert
 
     OUString convertLogArgToString( const DateTime& _rDateTime )
     {
-        char buffer[ 30 ];
+        char buffer[ sizeof("-32768-65535-65535 65535:65535:65535.4294967295") ];
+            // reserve enough space for hypothetical max length
         const size_t buffer_size = sizeof( buffer );
-        snprintf( buffer, buffer_size, "%04i-%02i-%02i %02i:%02i:%02i.%09i",
-            (int)_rDateTime.Year, (int)_rDateTime.Month, (int)_rDateTime.Day,
-            (int)_rDateTime.Hours, (int)_rDateTime.Minutes, (int)_rDateTime.Seconds, (int)_rDateTime.NanoSeconds );
+        snprintf( buffer, buffer_size, "%04" SAL_PRIdINT32 "-%02" SAL_PRIuUINT32 "-%02" SAL_PRIuUINT32 " %02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32 ".%09" SAL_PRIuUINT32,
+            static_cast<sal_Int32>(_rDateTime.Year), static_cast<sal_uInt32>(_rDateTime.Month), static_cast<sal_uInt32>(_rDateTime.Day),
+            static_cast<sal_uInt32>(_rDateTime.Hours), static_cast<sal_uInt32>(_rDateTime.Minutes), static_cast<sal_uInt32>(_rDateTime.Seconds), _rDateTime.NanoSeconds );
         return OUString::createFromAscii( buffer );
     }
 
diff --git a/extensions/source/logging/plaintextformatter.cxx b/extensions/source/logging/plaintextformatter.cxx
index 40c7c7156c06..8514d52565ce 100644
--- a/extensions/source/logging/plaintextformatter.cxx
+++ b/extensions/source/logging/plaintextformatter.cxx
@@ -79,7 +79,8 @@ namespace logging
 
     OUString SAL_CALL PlainTextFormatter::format( const LogRecord& _rRecord )
     {
-        char buffer[ 30 ];
+        char buffer[ sizeof("-32768-65535-65535 65535:65535:65535.4294967295") ];
+            // reserve enough space for hypothetical max length
         const int buffer_size = sizeof( buffer );
         int used = snprintf( buffer, buffer_size, "%10i", (int)_rRecord.SequenceNumber );
         if ( used >= buffer_size || used < 0 )
@@ -94,9 +95,9 @@ namespace logging
         aLogEntry.appendAscii( buffer );
         aLogEntry.append( " " );
 
-        snprintf( buffer, buffer_size, "%04i-%02i-%02i %02i:%02i:%02i.%09i",
-            (int)_rRecord.LogTime.Year, (int)_rRecord.LogTime.Month, (int)_rRecord.LogTime.Day,
-            (int)_rRecord.LogTime.Hours, (int)_rRecord.LogTime.Minutes, (int)_rRecord.LogTime.Seconds, (int)_rRecord.LogTime.NanoSeconds );
+        snprintf( buffer, buffer_size, "%04" SAL_PRIdINT32 "-%02" SAL_PRIuUINT32 "-%02" SAL_PRIuUINT32 " %02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32 ".%09" SAL_PRIuUINT32,
+            static_cast<sal_Int32>(_rRecord.LogTime.Year), static_cast<sal_uInt32>(_rRecord.LogTime.Month), static_cast<sal_uInt32>(_rRecord.LogTime.Day),
+            static_cast<sal_uInt32>(_rRecord.LogTime.Hours), static_cast<sal_uInt32>(_rRecord.LogTime.Minutes), static_cast<sal_uInt32>(_rRecord.LogTime.Seconds), _rRecord.LogTime.NanoSeconds );
         aLogEntry.appendAscii( buffer );
         aLogEntry.append( " " );
 
diff --git a/sd/source/filter/eppt/pptx-epptooxml.cxx b/sd/source/filter/eppt/pptx-epptooxml.cxx
index f08b71d91d23..366d8e4a180e 100644
--- a/sd/source/filter/eppt/pptx-epptooxml.cxx
+++ b/sd/source/filter/eppt/pptx-epptooxml.cxx
@@ -1900,9 +1900,10 @@ bool PowerPointExport::WriteComments(sal_uInt32 nPageNum)
                 Reference< XText > xText(xAnnotation->getTextRange());
                 sal_Int32 nLastIndex;
                 sal_Int32 nId = GetAuthorIdAndLastIndex(xAnnotation->getAuthor(), nLastIndex);
-                char cDateTime[32];
+                char cDateTime[sizeof("-32768-65535-65535T65535:65535:65535.4294967295")];
+                    // reserve enough space for hypothetical max length
 
-                snprintf(cDateTime, 31, "%02d-%02d-%02dT%02d:%02d:%02d.%09" SAL_PRIuUINT32, aDateTime.Year, aDateTime.Month, aDateTime.Day, aDateTime.Hours, aDateTime.Minutes, aDateTime.Seconds, aDateTime.NanoSeconds);
+                snprintf(cDateTime, sizeof cDateTime, "%02" SAL_PRIdINT32 "-%02" SAL_PRIuUINT32 "-%02" SAL_PRIuUINT32 "T%02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32 ".%09" SAL_PRIuUINT32, sal_Int32(aDateTime.Year), sal_uInt32(aDateTime.Month), sal_uInt32(aDateTime.Day), sal_uInt32(aDateTime.Hours), sal_uInt32(aDateTime.Minutes), sal_uInt32(aDateTime.Seconds), aDateTime.NanoSeconds);
 
                 pFS->startElementNS(XML_p, XML_cm,
                                     XML_authorId, I32S(nId),
diff --git a/svl/source/misc/lockfilecommon.cxx b/svl/source/misc/lockfilecommon.cxx
index 6768b7b07f87..eb5754eb0476 100644
--- a/svl/source/misc/lockfilecommon.cxx
+++ b/svl/source/misc/lockfilecommon.cxx
@@ -202,8 +202,9 @@ OUString LockFileCommon::GetCurrentLocalTime()
             oslDateTime aDateTime;
             if ( osl_getDateTimeFromTimeValue( &aLocTime, &aDateTime ) )
             {
-                char pDateTime[20];
-                sprintf( pDateTime, "%02d.%02d.%4d %02d:%02d", aDateTime.Day, aDateTime.Month, aDateTime.Year, aDateTime.Hours, aDateTime.Minutes );
+                char pDateTime[sizeof("65535.65535.-32768 65535:65535")];
+                    // reserve enough space for hypothetical max length
+                sprintf( pDateTime, "%02" SAL_PRIuUINT32 ".%02" SAL_PRIuUINT32 ".%4" SAL_PRIdINT32 " %02" SAL_PRIuUINT32 ":%02" SAL_PRIuUINT32, sal_uInt32(aDateTime.Day), sal_uInt32(aDateTime.Month), sal_Int32(aDateTime.Year), sal_uInt32(aDateTime.Hours), sal_uInt32(aDateTime.Minutes) );
                 aTime = OUString::createFromAscii( pDateTime );
             }
         }