Disable PRF by default.

Since it is not any better by default without initializing the key, we
disable it by default. It can be turned on with JANET_PRF in
janetconf.h.

src/conf/janetconf.h

@@ -57,7 +57,7 @@
 /* #define JANET_NO_UMASK */
 
 /* Other settings */
-/* #define JANET_NO_PRF */
+/* #define JANET_PRF */
 /* #define JANET_NO_UTC_MKTIME */
 /* #define JANET_OUT_OF_MEMORY do { printf("janet out of memory\n"); exit(1); } while (0) */
 /* #define JANET_EXIT(msg) do { printf("C assert failed executing janet: %s\n", msg); exit(1); } while (0) */

src/core/net.c

@@ -566,7 +566,8 @@ static Janet cfun_net_server(int32_t argc, Janet *argv) {
     }
 
     /* Put sfd on our loop */
-    JanetLoopFD lfd = {0};
+    JanetLoopFD lfd;
+    memset(&lfd, 0, sizeof(lfd));
     lfd.stream = make_stream(sfd, 0);
     lfd.event_type = JLE_READ_ACCEPT;
     lfd.data.read_accept.handler = fun;

src/core/util.c

@@ -97,7 +97,7 @@ const char *const janet_status_names[16] = {
     "alive"
 };
 
-#ifdef JANET_NO_PRF
+#ifndef JANET_PRF
 
 int32_t janet_string_calchash(const uint8_t *str, int32_t len) {
     const uint8_t *end = str + len;

src/include/janet.h

@@ -1381,7 +1381,7 @@ JANET_API int janet_verify(JanetFuncDef *def);
 JANET_API JanetBuffer *janet_pretty(JanetBuffer *buffer, int depth, int flags, Janet x);
 
 /* Misc */
-#ifndef JANET_NO_PRF
+#ifdef JANET_PRF
 #define JANET_HASH_KEY_SIZE 16
 JANET_API void janet_init_hash_key(uint8_t key[JANET_HASH_KEY_SIZE]);
 #endif