test: add new fuzzers for parsing datetime

Part of #6731

NO_DOC=internal
NO_CHANGELOG=internal

test/fuzz/CMakeLists.txt

@@ -44,7 +44,15 @@ target_link_libraries(swim_proto_member_fuzzer PUBLIC swim fuzzer_config)
 add_executable(swim_proto_meta_fuzzer swim_proto_meta_fuzzer.c)
 target_link_libraries(swim_proto_meta_fuzzer PUBLIC swim fuzzer_config)
 
+add_executable(datetime_parse_full_fuzzer datetime_parse_full_fuzzer.c)
+target_link_libraries(datetime_parse_full_fuzzer PUBLIC core fuzzer_config)
+
+add_executable(datetime_strptime_fuzzer datetime_strptime_fuzzer.c)
+target_link_libraries(datetime_strptime_fuzzer PUBLIC core fuzzer_config)
+
 set(fuzzing_binaries csv_fuzzer
+                     datetime_parse_full_fuzzer
+                     datetime_strptime_fuzzer
                      http_parser_fuzzer
                      swim_proto_member_fuzzer
                      swim_proto_meta_fuzzer

test/fuzz/datetime_parse_full_fuzzer.c

+#include <stdlib.h>
+#include <string.h>
+#include "datetime.h"
+#include "trivia/util.h"
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	char *buf = xcalloc(size + 1, sizeof(char));
+	if (buf == NULL)
+		return 0;
+	memcpy(buf, data, size);
+	buf[size] = '\0';
+	struct datetime date_expected;
+	datetime_parse_full(&date_expected, buf, size, 0);
+	free(buf);
+
+	return 0;
+}

test/fuzz/datetime_strptime_fuzzer.c

+#include <stdlib.h>
+#include <string.h>
+#include "datetime.h"
+#include "trivia/util.h"
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	char *buf = xcalloc(size + 1, sizeof(char));
+	if (buf == NULL)
+		return 0;
+	memcpy(buf, data, size);
+	buf[size] = '\0';
+	struct datetime date_expected;
+	datetime_strptime(&date_expected, buf, "iso8601");
+	free(buf);
+
+	return 0;
+}