[platform] native macOS environment reader: sources (IDEA-216133)

GitOrigin-RevId: e713b19c9e4bd6ecd74eeca7cbeb1fcd95b04e4a

native/MacEnvReader/.gitignore

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+/.idea/
+/cmake-build-*/

native/MacEnvReader/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(MacEnvReader C)
+
+if (NOT APPLE)
+    message(FATAL_ERROR "macOS only.")
+endif ()
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_OSX_ARCHITECTURES "x86_64;arm64")
+set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9)
+
+add_compile_options("-fno-objc-arc" "-flto=full" "-Wall" "-Wextra" "-Wpedantic")
+
+add_executable(printenv printenv.c)

native/MacEnvReader/printenv.c

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+// Copyright 2000-2021 JetBrains s.r.o. and contributors.
+// Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+
+#include <stdio.h>
+
+int main(int argc, const char **argv, const char **env) {
+  if (argc != 2) {
+    printf("usage: %s output_file\n", argv[0]);
+    return 1;
+  }
+
+  FILE *f = fopen(argv[1], "w");
+  if (f == NULL) {
+    perror("fopen");
+    return 2;
+  }
+
+  const char **v = env;
+  while (*v != NULL) {
+    fputs(*v, f);
+    fputc('\0', f);
+    v++;
+  }
+
+  fclose(f);
+
+  return 0;
+}