fix: parse_uint64_t overflow handling

runtime/include/json.h

@@ -1,6 +1,6 @@
 #pragma once
 
-
+#include <errno.h>
 #include <inttypes.h>
 #include <stdbool.h>
 #include <stdlib.h>
@@ -156,14 +156,18 @@ parse_uint32_t(jsmntok_t tok, const char *json_buf, const char *key, uint32_t *r
 static inline int
 parse_uint64_t(jsmntok_t tok, const char *json_buf, const char *key, uint64_t *ret)
 {
-	char    *end  = NULL;
+	if (json_buf[tok.start] == '-') {
-	intmax_t temp = strtoimax(&json_buf[tok.start], &end, 10);
+		fprintf(stderr, "Unable to parse uint64_t for key %s, had negative number\n", key);
+	}
 
-	if (end != &json_buf[tok.end] || temp < 0 || temp > UINT64_MAX) {
+	errno          = 0;
+	char     *end  = NULL;
+	uintmax_t temp = strtoumax(&json_buf[tok.start], &end, 10);
+	if (end != &json_buf[tok.end] || (temp == UINT64_MAX && errno == ERANGE)) {
 		fprintf(stderr, "Unable to parse uint64_t for key %s\n", key);
 		return -1;
 	}
 
-	*ret = (uint64_t)temp;
+	*ret = temp;
 	return 0;
 }