Pivot to simpler approach. Passes JSONTestSuite

src/validate.cpp

@@ -0,0 +1,39 @@
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "callbacks.h"
+#include "parser3.h"
+
+int main(int argc, char **argv) {
+  if (argc < 2) {
+    printf("Usage: %s <path>\n", argv[0]);
+    return 1;
+  }
+  int fd = open(argv[1], O_RDONLY);
+  if (fd == -1) {
+    perror("open");
+    return 1;
+  }
+  auto c = noopCallbacks();
+  parser3::Parser3 parser(&c, nullptr);
+  for (;;) {
+    char buf[1024];
+    int l = read(fd, buf, sizeof(buf));
+    if (l == -1) {
+      perror("read");
+      return 1;
+    }
+    switch (parser.parse(buf, l)) {
+    case parser3::S_OK:
+      return 0;
+    case parser3::S_AGAIN:
+      continue;
+    case parser3::S_REJECT:
+    case parser3::S_OVERFLOW:
+      return 1;
+    }
+    if (l == 0) {
+      return 1;
+    }
+  }
+}