Switch from C headers to C++ headers.

This CL makes the following substitutions.

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

PiperOrigin-RevId: 309080151

benchmarks/db_bench.cc

@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include <stdio.h>
-#include <stdlib.h>
 #include <sys/types.h>
 
+#include <cstdio>
+#include <cstdlib>
+
 #include "leveldb/cache.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"

benchmarks/db_bench_sqlite3.cc

@@ -3,8 +3,9 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include <sqlite3.h>
-#include <stdio.h>
-#include <stdlib.h>
+
+#include <cstdio>
+#include <cstdlib>
 
 #include "util/histogram.h"
 #include "util/random.h"

benchmarks/db_bench_tree_db.cc

@@ -3,8 +3,9 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include <kcpolydb.h>
-#include <stdio.h>
-#include <stdlib.h>
+
+#include <cstdio>
+#include <cstdlib>
 
 #include "util/histogram.h"
 #include "util/random.h"

db/db_impl.cc

@@ -4,11 +4,10 @@
 
 #include "db/db_impl.h"
 
-#include <stdint.h>
-#include <stdio.h>
-
 #include <algorithm>
 #include <atomic>
+#include <cstdint>
+#include <cstdio>
 #include <set>
 #include <string>
 #include <vector>

db/db_iter.h

@@ -5,7 +5,7 @@
 #ifndef STORAGE_LEVELDB_DB_DB_ITER_H_
 #define STORAGE_LEVELDB_DB_DB_ITER_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "db/dbformat.h"
 #include "leveldb/db.h"

db/dbformat.cc

@@ -4,8 +4,7 @@
 
 #include "db/dbformat.h"
 
-#include <stdio.h>
-
+#include <cstdio>
 #include <sstream>
 
 #include "port/port.h"

db/dumpfile.cc

@@ -4,7 +4,7 @@
 
 #include "leveldb/dumpfile.h"
 
-#include <stdio.h>
+#include <cstdio>
 
 #include "db/dbformat.h"
 #include "db/filename.h"

db/filename.cc

@@ -4,8 +4,8 @@
 
 #include "db/filename.h"
 
-#include <ctype.h>
-#include <stdio.h>
+#include <cassert>
+#include <cstdio>
 
 #include "db/dbformat.h"
 #include "leveldb/env.h"

db/filename.h

@@ -7,8 +7,7 @@
 #ifndef STORAGE_LEVELDB_DB_FILENAME_H_
 #define STORAGE_LEVELDB_DB_FILENAME_H_
 
-#include <stdint.h>
-
+#include <cstdint>
 #include <string>
 
 #include "leveldb/slice.h"

db/leveldbutil.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include <stdio.h>
+#include <cstdio>
 
 #include "leveldb/dumpfile.h"
 #include "leveldb/env.h"

db/log_reader.cc

@@ -4,7 +4,7 @@
 
 #include "db/log_reader.h"
 
-#include <stdio.h>
+#include <cstdio>
 
 #include "leveldb/env.h"
 #include "util/coding.h"

db/log_reader.h

@@ -5,7 +5,7 @@
 #ifndef STORAGE_LEVELDB_DB_LOG_READER_H_
 #define STORAGE_LEVELDB_DB_LOG_READER_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "db/log_format.h"
 #include "leveldb/slice.h"

db/log_writer.cc

@@ -4,7 +4,7 @@
 
 #include "db/log_writer.h"
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "leveldb/env.h"
 #include "util/coding.h"

db/log_writer.h

@@ -5,7 +5,7 @@
 #ifndef STORAGE_LEVELDB_DB_LOG_WRITER_H_
 #define STORAGE_LEVELDB_DB_LOG_WRITER_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "db/log_format.h"
 #include "leveldb/slice.h"

db/table_cache.h

@@ -7,8 +7,7 @@
 #ifndef STORAGE_LEVELDB_DB_TABLE_CACHE_H_
 #define STORAGE_LEVELDB_DB_TABLE_CACHE_H_
 
-#include <stdint.h>
-
+#include <cstdint>
 #include <string>
 
 #include "db/dbformat.h"

db/version_set.cc

@@ -4,9 +4,8 @@
 
 #include "db/version_set.h"
 
-#include <stdio.h>
-
 #include <algorithm>
+#include <cstdio>
 
 #include "db/filename.h"
 #include "db/log_reader.h"

helpers/memenv/memenv.cc

@@ -4,8 +4,7 @@
 
 #include "helpers/memenv/memenv.h"
 
-#include <string.h>
-
+#include <cstring>
 #include <limits>
 #include <map>
 #include <string>

include/leveldb/cache.h

@@ -18,7 +18,7 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_CACHE_H_
 #define STORAGE_LEVELDB_INCLUDE_CACHE_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "leveldb/export.h"
 #include "leveldb/slice.h"

include/leveldb/db.h

@@ -5,8 +5,8 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_DB_H_
 #define STORAGE_LEVELDB_INCLUDE_DB_H_
 
-#include <stdint.h>
-#include <stdio.h>
+#include <cstdint>
+#include <cstdio>
 
 #include "leveldb/export.h"
 #include "leveldb/iterator.h"

include/leveldb/env.h

@@ -13,9 +13,8 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_ENV_H_
 #define STORAGE_LEVELDB_INCLUDE_ENV_H_
 
-#include <stdarg.h>
-#include <stdint.h>
-
+#include <cstdarg>
+#include <cstdint>
 #include <string>
 #include <vector>
 

include/leveldb/options.h

@@ -5,7 +5,7 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_OPTIONS_H_
 #define STORAGE_LEVELDB_INCLUDE_OPTIONS_H_
 
-#include <stddef.h>
+#include <cstddef>
 
 #include "leveldb/export.h"
 

include/leveldb/slice.h

@@ -15,10 +15,9 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_SLICE_H_
 #define STORAGE_LEVELDB_INCLUDE_SLICE_H_
 
-#include <assert.h>
-#include <stddef.h>
-#include <string.h>
-
+#include <cassert>
+#include <cstddef>
+#include <cstring>
 #include <string>
 
 #include "leveldb/export.h"

include/leveldb/table.h

@@ -5,7 +5,7 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_TABLE_H_
 #define STORAGE_LEVELDB_INCLUDE_TABLE_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "leveldb/export.h"
 #include "leveldb/iterator.h"

include/leveldb/table_builder.h

@@ -13,7 +13,7 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_TABLE_BUILDER_H_
 #define STORAGE_LEVELDB_INCLUDE_TABLE_BUILDER_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 #include "leveldb/export.h"
 #include "leveldb/options.h"

table/block.h

@@ -5,8 +5,8 @@
 #ifndef STORAGE_LEVELDB_TABLE_BLOCK_H_
 #define STORAGE_LEVELDB_TABLE_BLOCK_H_
 
-#include <stddef.h>
-#include <stdint.h>
+#include <cstddef>
+#include <cstdint>
 
 #include "leveldb/iterator.h"
 

table/block_builder.cc

@@ -28,9 +28,8 @@
 
 #include "table/block_builder.h"
 
-#include <assert.h>
-
 #include <algorithm>
+#include <cassert>
 
 #include "leveldb/comparator.h"
 #include "leveldb/options.h"

table/block_builder.h

@@ -5,8 +5,7 @@
 #ifndef STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
 #define STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
 
-#include <stdint.h>
-
+#include <cstdint>
 #include <vector>
 
 #include "leveldb/slice.h"

table/filter_block.h

@@ -9,9 +9,8 @@
 #ifndef STORAGE_LEVELDB_TABLE_FILTER_BLOCK_H_
 #define STORAGE_LEVELDB_TABLE_FILTER_BLOCK_H_
 
-#include <stddef.h>
-#include <stdint.h>
-
+#include <cstddef>
+#include <cstdint>
 #include <string>
 #include <vector>
 

table/format.h

@@ -5,8 +5,7 @@
 #ifndef STORAGE_LEVELDB_TABLE_FORMAT_H_
 #define STORAGE_LEVELDB_TABLE_FORMAT_H_
 
-#include <stdint.h>
-
+#include <cstdint>
 #include <string>
 
 #include "leveldb/slice.h"

table/table_builder.cc

@@ -4,7 +4,7 @@
 
 #include "leveldb/table_builder.h"
 
-#include <assert.h>
+#include <cassert>
 
 #include "leveldb/comparator.h"
 #include "leveldb/env.h"

util/cache.cc

@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-
 #include "leveldb/cache.h"
+
+#include <cassert>
+#include <cstdio>
+#include <cstdlib>
+
 #include "port/port.h"
 #include "port/thread_annotations.h"
 #include "util/hash.h"

util/crc32c.cc

@@ -6,8 +6,8 @@
 
 #include "util/crc32c.h"
 
-#include <stddef.h>
-#include <stdint.h>
+#include <cstddef>
+#include <cstdint>
 
 #include "port/port.h"
 #include "util/coding.h"

util/crc32c.h

@@ -5,8 +5,8 @@
 #ifndef STORAGE_LEVELDB_UTIL_CRC32C_H_
 #define STORAGE_LEVELDB_UTIL_CRC32C_H_
 
-#include <stddef.h>
-#include <stdint.h>
+#include <cstddef>
+#include <cstdint>
 
 namespace leveldb {
 namespace crc32c {

util/hash.cc

@@ -4,7 +4,7 @@
 
 #include "util/hash.h"
 
-#include <string.h>
+#include <cstring>
 
 #include "util/coding.h"
 

util/hash.h

@@ -7,8 +7,8 @@
 #ifndef STORAGE_LEVELDB_UTIL_HASH_H_
 #define STORAGE_LEVELDB_UTIL_HASH_H_
 
-#include <stddef.h>
-#include <stdint.h>
+#include <cstddef>
+#include <cstdint>
 
 namespace leveldb {
 

util/histogram.cc

@@ -4,8 +4,8 @@
 
 #include "util/histogram.h"
 
-#include <math.h>
-#include <stdio.h>
+#include <cmath>
+#include <cstdio>
 
 #include "port/port.h"
 

util/logging.cc

@@ -4,11 +4,9 @@
 
 #include "util/logging.h"
 
-#include <errno.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
 #include <limits>
 
 #include "leveldb/env.h"

util/logging.h

@@ -8,9 +8,8 @@
 #ifndef STORAGE_LEVELDB_UTIL_LOGGING_H_
 #define STORAGE_LEVELDB_UTIL_LOGGING_H_
 
-#include <stdint.h>
-#include <stdio.h>
-
+#include <cstdint>
+#include <cstdio>
 #include <string>
 
 #include "port/port.h"

util/random.h

@@ -5,7 +5,7 @@
 #ifndef STORAGE_LEVELDB_UTIL_RANDOM_H_
 #define STORAGE_LEVELDB_UTIL_RANDOM_H_
 
-#include <stdint.h>
+#include <cstdint>
 
 namespace leveldb {
 

util/status.cc

@@ -4,7 +4,7 @@
 
 #include "leveldb/status.h"
 
-#include <stdio.h>
+#include <cstdio>
 
 #include "port/port.h"