compdb: escape control characters in JSON strings

1 files changed, 53 insertions, 0 deletions

diff --git a/src/json.cc b/src/json.cc
new file mode 100644
index 0000000..4bbf6e1
--- /dev/null
+++ b/src/json.cc
@@ -0,0 +1,53 @@
+// Copyright 2021 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "json.h"
+
+#include <cstdio>
+#include <string>
+
+std::string EncodeJSONString(const std::string& in) {
+  static const char* hex_digits = "0123456789abcdef";
+  std::string out;
+  out.reserve(in.length() * 1.2);
+  for (std::string::const_iterator it = in.begin(); it != in.end(); ++it) {
+    char c = *it;
+    if (c == '\b')
+      out += "\\b";
+    else if (c == '\f')
+      out += "\\f";
+    else if (c == '\n')
+      out += "\\n";
+    else if (c == '\r')
+      out += "\\r";
+    else if (c == '\t')
+      out += "\\t";
+    else if (0x0 <= c && c < 0x20) {
+      out += "\\u00";
+      out += hex_digits[c >> 4];
+      out += hex_digits[c & 0xf];
+    } else if (c == '\\')
+      out += "\\\\";
+    else if (c == '\"')
+      out += "\\\"";
+    else
+      out += c;
+  }
+  return out;
+}
+
+void PrintJSONString(const std::string& in) {
+  std::string out = EncodeJSONString(in);
+  fwrite(out.c_str(), 1, out.length(), stdout);
+}