Address review feedback

include/weaseljson.h

@@ -67,7 +67,7 @@ void WeaselJsonParser_destroy(WeaselJsonParser *parser);
 /** Incrementally parse `len` more bytes starting at `buf`. `buf` may be
  * modified. Call with `len` 0 to indicate end of data. `buf` may be null if
  * `len` is 0. `len` must not be negative; a negative length is treated as a
- * rejected input. */
+ * rejected input. Returns WeaselJson_NULL if parser is null */
 WeaselJsonStatus WeaselJsonParser_parse(WeaselJsonParser *parser, char *buf,
                                         int len);
 

src/test.cpp

@@ -331,8 +331,7 @@ TEST_CASE("parse rejects negative length") {
 }
 
 TEST_CASE("Calling parse with nullptr doesn't crash") {
-  char buf[10] = "hello";
-  REQUIRE(WeaselJsonParser_parse(nullptr, buf, -1) == WeaselJson_NULL);
+  REQUIRE(WeaselJsonParser_parse(nullptr, nullptr, 0) == WeaselJson_NULL);
 }
 
 TEST_CASE("streaming") { testStreaming(json); }

src/validate.cpp

@@ -34,7 +34,7 @@ int main(int argc, char **argv) {
     case WeaselJson_OVERFLOW:
       return 1;
     case WeaselJson_NULL:
-      fprintf(stderr, "Could not create parser\n");
+      fprintf(stderr, "parse called with a null parser\n");
       return 1;
     }
     if (l == 0) {