Switch from C headers to C++ headers.

This CL makes the following substitutions.

* assert.h -> cassert
* math.h -> cmath
* stdarg.h -> cstdarg
* stdio.h -> cstdio
* stdlib.h -> cstdlib
* string.h -> cstring

stddef.h and stdint.h are not migrated to C++ headers.

PiperOrigin-RevId: 309074805

snappy-sinksource.cc

@@ -26,7 +26,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <cstddef>
+#include <stddef.h>
 #include <cstring>
 
 #include "snappy-sinksource.h"

snappy-stubs-internal.h

@@ -35,15 +35,14 @@
 #include "config.h"
 #endif
 
-#include <cstdint>
+#include <stdint.h>
+
+#include <cassert>
+#include <cstdlib>
 #include <cstring>
 #include <limits>
 #include <string>
 
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-
 #ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #endif

snappy-test.h

@@ -31,14 +31,13 @@
 #ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_
 #define THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_
 
+#include <cstdarg>
+#include <cstdio>
 #include <iostream>
 #include <string>
 
 #include "snappy-stubs-internal.h"
 
-#include <stdio.h>
-#include <stdarg.h>
-
 #ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #endif

snappy.cc

@@ -68,9 +68,8 @@
 #include <immintrin.h>
 #endif
 
-#include <stdio.h>
-
 #include <algorithm>
+#include <cstdio>
 #include <cstring>
 #include <string>
 #include <vector>

snappy.h

@@ -39,8 +39,9 @@
 #ifndef THIRD_PARTY_SNAPPY_SNAPPY_H__
 #define THIRD_PARTY_SNAPPY_SNAPPY_H__
 
-#include <cstddef>
-#include <cstdint>
+#include <stddef.h>
+#include <stdint.h>
+
 #include <string>
 
 #include "snappy-stubs-public.h"

snappy_compress_fuzzer.cc

@@ -28,9 +28,10 @@
 //
 // libFuzzer harness for fuzzing snappy compression code.
 
+#include <stddef.h>
+#include <stdint.h>
+
 #include <cassert>
-#include <cstddef>
-#include <cstdint>
 #include <string>
 
 #include "snappy.h"

snappy_uncompress_fuzzer.cc

@@ -28,9 +28,10 @@
 //
 // libFuzzer harness for fuzzing snappy's decompression code.
 
+#include <stddef.h>
+#include <stdint.h>
+
 #include <cassert>
-#include <cstddef>
-#include <cstdint>
 #include <string>
 
 #include "snappy.h"

snappy_unittest.cc

@@ -26,8 +26,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <math.h>
-#include <stdlib.h>
+#include <cmath>
+#include <cstdlib>
 
 #include <algorithm>
 #include <random>