1 files changed, 139 insertions, 0 deletions
diff --git a/toolkit/xre/AssembleCmdLine.h b/toolkit/xre/AssembleCmdLine.h
new file mode 100644
index 0000000000..d969fedfed
--- /dev/null
+++ b/toolkit/xre/AssembleCmdLine.h
@@ -0,0 +1,139 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_AssembleCmdLine_h
+#define mozilla_AssembleCmdLine_h
+
+#if defined(XP_WIN)
+
+#  include "mozilla/UniquePtr.h"
+
+#  include <stdlib.h>
+#  include <windows.h>
+
+#  ifdef MOZILLA_INTERNAL_API
+#    include "nsString.h"
+#  endif  // MOZILLA_INTERNAL_API
+
+namespace mozilla {
+
+// Out param `aWideCmdLine` must be free()d by the caller.
+inline int assembleCmdLine(const char* const* aArgv, wchar_t** aWideCmdLine,
+                           UINT aCodePage) {
+  const char* const* arg;
+  char* p;
+  const char* q;
+  char* cmdLine;
+  int cmdLineSize;
+  int numBackslashes;
+  int i;
+  int argNeedQuotes;
+
+  /*
+   * Find out how large the command line buffer should be.
+   */
+  cmdLineSize = 0;
+  for (arg = aArgv; *arg; ++arg) {
+    /*
+     * \ and " need to be escaped by a \.  In the worst case,
+     * every character is a \ or ", so the string of length
+     * may double.  If we quote an argument, that needs two ".
+     * Finally, we need a space between arguments, and
+     * a null byte at the end of command line.
+     */
+    cmdLineSize += 2 * strlen(*arg) /* \ and " need to be escaped */
+                   + 2              /* we quote every argument */
+                   + 1;             /* space in between, or final null */
+  }
+  p = cmdLine = (char*)malloc(cmdLineSize * sizeof(char));
+  if (!p) {
+    return -1;
+  }
+
+  for (arg = aArgv; *arg; ++arg) {
+    /* Add a space to separates the arguments */
+    if (arg != aArgv) {
+      *p++ = ' ';
+    }
+    q = *arg;
+    numBackslashes = 0;
+    argNeedQuotes = 0;
+
+    /*
+     * If the argument is empty or contains white space, it needs to
+     * be quoted.
+     */
+    if (**arg == '\0' || strpbrk(*arg, " \f\n\r\t\v")) {
+      argNeedQuotes = 1;
+    }
+
+    if (argNeedQuotes) {
+      *p++ = '"';
+    }
+    while (*q) {
+      if (*q == '\\') {
+        numBackslashes++;
+        q++;
+      } else if (*q == '"') {
+        if (numBackslashes) {
+          /*
+           * Double the backslashes since they are followed
+           * by a quote
+           */
+          for (i = 0; i < 2 * numBackslashes; i++) {
+            *p++ = '\\';
+          }
+          numBackslashes = 0;
+        }
+        /* To escape the quote */
+        *p++ = '\\';
+        *p++ = *q++;
+      } else {
+        if (numBackslashes) {
+          /*
+           * Backslashes are not followed by a quote, so
+           * don't need to double the backslashes.
+           */
+          for (i = 0; i < numBackslashes; i++) {
+            *p++ = '\\';
+          }
+          numBackslashes = 0;
+        }
+        *p++ = *q++;
+      }
+    }
+
+    /* Now we are at the end of this argument */
+    if (numBackslashes) {
+      /*
+       * Double the backslashes if we have a quote string
+       * delimiter at the end.
+       */
+      if (argNeedQuotes) {
+        numBackslashes *= 2;
+      }
+      for (i = 0; i < numBackslashes; i++) {
+        *p++ = '\\';
+      }
+    }
+    if (argNeedQuotes) {
+      *p++ = '"';
+    }
+  }
+
+  *p = '\0';
+  int numChars = MultiByteToWideChar(aCodePage, 0, cmdLine, -1, nullptr, 0);
+  *aWideCmdLine = (wchar_t*)malloc(numChars * sizeof(wchar_t));
+  MultiByteToWideChar(aCodePage, 0, cmdLine, -1, *aWideCmdLine, numChars);
+  free(cmdLine);
+  return 0;
+}
+
+}  // namespace mozilla
+
+#endif  // defined(XP_WIN)
+
+#endif  // mozilla_AssembleCmdLine_h