std.cfg: Improved tests for memchr().

test/cfg/std.c

@@ -2697,6 +2697,15 @@ void uninitvar_memchr(void)
     (void)memchr(cs,c,n);
 }
 
+void *bufferAccessOutOfBounds_memchr(const void *s, int c, size_t n)
+{
+    char buf[42]={0};
+    (void)memchr(buf,c,42);
+    // cppcheck-suppress bufferAccessOutOfBounds
+    (void)memchr(buf,c,43);
+    return memchr(s,c,n);
+}
+
 void uninitvar_wmemchr(void)
 {
     wchar_t *cs;

test/cfg/std.cpp

@@ -32,6 +32,15 @@
 #include <iterator>
 #include <vector>
 
+void *bufferAccessOutOfBounds_memchr(void *s, int c, size_t n)
+{
+    char buf[42]={0};
+    (void)std::memchr(buf,c,42);
+    // cppcheck-suppress bufferAccessOutOfBounds
+    (void)std::memchr(buf,c,43);
+    return std::memchr(s,c,n);
+}
+
 // As with all bounds-checked functions, localtime_s is only guaranteed to be available if __STDC_LIB_EXT1__ is defined by the implementation and if the user defines __STDC_WANT_LIB_EXT1__ to the integer constant 1 before including time.h.
 #ifdef __STDC_LIB_EXT1__
 void uninitvar_localtime_s(const std::time_t *restrict time, struct tm *restrict result)