1 files changed, 102 insertions, 0 deletions
diff --git a/toolkit/components/remote/RemoteUtils.cpp b/toolkit/components/remote/RemoteUtils.cpp
new file mode 100644
index 0000000000..73940018cf
--- /dev/null
+++ b/toolkit/components/remote/RemoteUtils.cpp
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=8:
+ */
+/* vim:set ts=8 sw=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include "RemoteUtils.h"
+
+#ifdef IS_BIG_ENDIAN
+#  define TO_LITTLE_ENDIAN32(x)                               \
+    ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
+     (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
+#else
+#  define TO_LITTLE_ENDIAN32(x) (x)
+#endif
+
+#ifndef MAX_PATH
+#  ifdef PATH_MAX
+#    define MAX_PATH PATH_MAX
+#  else
+#    define MAX_PATH 1024
+#  endif
+#endif
+
+/* like strcpy, but return the char after the final null */
+static char* estrcpy(const char* s, char* d) {
+  while (*s) *d++ = *s++;
+
+  *d++ = '\0';
+  return d;
+}
+
+/* Construct a command line from given args and desktop startup ID.
+ * Returned buffer must be released by free().
+ */
+char* ConstructCommandLine(int32_t argc, char** argv, const char* aStartupToken,
+                           int* aCommandLineLength) {
+  char cwdbuf[MAX_PATH];
+  if (!getcwd(cwdbuf, MAX_PATH)) return nullptr;
+
+  // the commandline property is constructed as an array of int32_t
+  // followed by a series of null-terminated strings:
+  //
+  // [argc][offsetargv0][offsetargv1...]<workingdir>\0<argv[0]>\0argv[1]...\0
+  // (offset is from the beginning of the buffer)
+
+  static char startupTokenPrefix[] = " STARTUP_TOKEN=";
+
+  int32_t argvlen = strlen(cwdbuf);
+  for (int i = 0; i < argc; ++i) {
+    int32_t len = strlen(argv[i]);
+    if (i == 0 && aStartupToken) {
+      len += sizeof(startupTokenPrefix) - 1 + strlen(aStartupToken);
+    }
+    argvlen += len;
+  }
+
+  auto* buffer =
+      (int32_t*)malloc(argvlen + argc + 1 + sizeof(int32_t) * (argc + 1));
+  if (!buffer) return nullptr;
+
+  buffer[0] = TO_LITTLE_ENDIAN32(argc);
+
+  auto* bufend = (char*)(buffer + argc + 1);
+
+  bufend = estrcpy(cwdbuf, bufend);
+
+  for (int i = 0; i < argc; ++i) {
+    buffer[i + 1] = TO_LITTLE_ENDIAN32(bufend - ((char*)buffer));
+    bufend = estrcpy(argv[i], bufend);
+    if (i == 0 && aStartupToken) {
+      bufend = estrcpy(startupTokenPrefix, bufend - 1);
+      bufend = estrcpy(aStartupToken, bufend - 1);
+    }
+  }
+
+#ifdef DEBUG_command_line
+  int32_t debug_argc = TO_LITTLE_ENDIAN32(*buffer);
+  char* debug_workingdir = (char*)(buffer + argc + 1);
+
+  printf(
+      "Sending command line:\n"
+      "  working dir: %s\n"
+      "  argc:\t%i",
+      debug_workingdir, debug_argc);
+
+  int32_t* debug_offset = buffer + 1;
+  for (int debug_i = 0; debug_i < debug_argc; ++debug_i)
+    printf("  argv[%i]:\t%s\n", debug_i,
+           ((char*)buffer) + TO_LITTLE_ENDIAN32(debug_offset[debug_i]));
+#endif
+
+  *aCommandLineLength = bufend - reinterpret_cast<char*>(buffer);
+  return reinterpret_cast<char*>(buffer);
+}