get_request_len() moved to string.c

build/src/string.c

@@ -285,3 +285,28 @@ void mg_url_encode(const char *src, char *dst, size_t dst_len) {
 
   *dst = '\0';
 }
+
+// Check whether full request is buffered. Return:
+//   -1  if request is malformed
+//    0  if request is not yet fully buffered
+//   >0  actual request length, including last \r\n\r\n
+static int get_request_len(const char *buf, int buf_len) {
+  int i;
+
+  for (i = 0; i < buf_len; i++) {
+    // Control characters are not allowed but >=128 is.
+    // Abort scan as soon as one malformed character is found;
+    // don't let subsequent \r\n\r\n win us over anyhow
+    if (!isprint(* (const unsigned char *) &buf[i]) && buf[i] != '\r' &&
+        buf[i] != '\n' && * (const unsigned char *) &buf[i] < 128) {
+      return -1;
+    } else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
+      return i + 2;
+    } else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
+               buf[i + 2] == '\n') {
+      return i + 3;
+    }
+  }
+
+  return 0;
+}