[glib/glib-2-40] gspawn-win32: do not rely on __argc and __argv global vars.

[Ignacio Casal Quinteiro <icq src gnome org>]

commit c047a008eacaa163b4345732e75220aa2b94d3ea
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Mon Jul 14 08:54:45 2014 +0200

    gspawn-win32: do not rely on __argc and __argv global vars.
    
    Since we are getting passed Unicode values these global vars
    might not have the correct value. Instead always get the wide arguments
    and convert them to utf8 to use them.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=733146

 glib/gspawn-win32-helper.c |   67 ++++++++++++++++++++++---------------------
 1 files changed, 34 insertions(+), 33 deletions(-)
---
diff --git a/glib/gspawn-win32-helper.c b/glib/gspawn-win32-helper.c
index 136eb4a..76191f9 100644
--- a/glib/gspawn-win32-helper.c
+++ b/glib/gspawn-win32-helper.c
@@ -64,8 +64,7 @@ write_err_and_exit (gint    fd,
 /* We build gspawn-win32-helper.exe as a Windows GUI application
  * to avoid any temporarily flashing console windows in case
  * the gspawn function is invoked by a GUI program. Thus, no main()
- * but a WinMain(). We do, however, still use argc and argv tucked
- * away in the global __argc and __argv by the C runtime startup code.
+ * but a WinMain().
  */
 
 /* Info peeked from mingw runtime's source code. __wgetmainargs() is a
@@ -211,6 +210,7 @@ main (int ignored_argc, char **ignored_argv)
   gint argv_zero_offset = ARG_PROGRAM;
   wchar_t **new_wargv;
   int argc;
+  char **argv;
   wchar_t **wargv, **wenvp;
   _startupinfo si = { 0 };
   char c;
@@ -225,28 +225,27 @@ main (int ignored_argc, char **ignored_argv)
   _CrtSetReportMode(_CRT_ASSERT, 0);
 #endif
 
-
-  g_assert (__argc >= ARG_COUNT);
-
   /* Fetch the wide-char argument vector */
   __wgetmainargs (&argc, &wargv, &wenvp, 0, &si);
 
-  /* We still have the system codepage args in __argv. We can look
-   * at the first args in which gspawn-win32.c passes us flags and
-   * fd numbers in __argv, as we know those are just ASCII anyway.
-   */
-  g_assert (argc == __argc);
+  g_assert (argc >= ARG_COUNT);
+
+  /* Convert unicode wargs to utf8 */
+  argv = g_new(char *, argc + 1);
+  for (i = 0; i < argc; i++)
+    argv[i] = g_utf16_to_utf8(wargv[i], -1, NULL, NULL, NULL);
+  argv[i] = NULL;
 
   /* argv[ARG_CHILD_ERR_REPORT] is the file descriptor number onto
    * which write error messages.
    */
-  child_err_report_fd = atoi (__argv[ARG_CHILD_ERR_REPORT]);
+  child_err_report_fd = atoi (argv[ARG_CHILD_ERR_REPORT]);
 
   /* Hack to implement G_SPAWN_FILE_AND_ARGV_ZERO. If
    * argv[ARG_CHILD_ERR_REPORT] is suffixed with a '#' it means we get
    * the program to run and its argv[0] separately.
    */
-  if (__argv[ARG_CHILD_ERR_REPORT][strlen (__argv[ARG_CHILD_ERR_REPORT]) - 1] == '#')
+  if (argv[ARG_CHILD_ERR_REPORT][strlen (argv[ARG_CHILD_ERR_REPORT]) - 1] == '#')
     argv_zero_offset++;
 
   /* argv[ARG_HELPER_SYNC] is the file descriptor number we read a
@@ -255,16 +254,16 @@ main (int ignored_argc, char **ignored_argv)
    * duplicate the process handle we sent it. Duplicating a handle
    * from another process works only if that other process exists.
    */
-  helper_sync_fd = atoi (__argv[ARG_HELPER_SYNC]);
+  helper_sync_fd = atoi (argv[ARG_HELPER_SYNC]);
 
   /* argv[ARG_STDIN..ARG_STDERR] are the file descriptor numbers that
    * should be dup2'd to 0, 1 and 2. '-' if the corresponding fd
    * should be left alone, and 'z' if it should be connected to the
    * bit bucket NUL:.
    */
-  if (__argv[ARG_STDIN][0] == '-')
+  if (argv[ARG_STDIN][0] == '-')
     ; /* Nothing */
-  else if (__argv[ARG_STDIN][0] == 'z')
+  else if (argv[ARG_STDIN][0] == 'z')
     {
       fd = open ("NUL:", O_RDONLY);
       if (fd != 0)
@@ -275,7 +274,7 @@ main (int ignored_argc, char **ignored_argv)
     }
   else
     {
-      fd = atoi (__argv[ARG_STDIN]);
+      fd = atoi (argv[ARG_STDIN]);
       if (fd != 0)
        {
          dup2 (fd, 0);
@@ -283,9 +282,9 @@ main (int ignored_argc, char **ignored_argv)
        }
     }
 
-  if (__argv[ARG_STDOUT][0] == '-')
+  if (argv[ARG_STDOUT][0] == '-')
     ; /* Nothing */
-  else if (__argv[ARG_STDOUT][0] == 'z')
+  else if (argv[ARG_STDOUT][0] == 'z')
     {
       fd = open ("NUL:", O_WRONLY);
       if (fd != 1)
@@ -296,7 +295,7 @@ main (int ignored_argc, char **ignored_argv)
     }
   else
     {
-      fd = atoi (__argv[ARG_STDOUT]);
+      fd = atoi (argv[ARG_STDOUT]);
       if (fd != 1)
        {
          dup2 (fd, 1);
@@ -304,9 +303,9 @@ main (int ignored_argc, char **ignored_argv)
        }
     }
 
-  if (__argv[ARG_STDERR][0] == '-')
+  if (argv[ARG_STDERR][0] == '-')
     ; /* Nothing */
-  else if (__argv[ARG_STDERR][0] == 'z')
+  else if (argv[ARG_STDERR][0] == 'z')
     {
       fd = open ("NUL:", O_WRONLY);
       if (fd != 2)
@@ -317,7 +316,7 @@ main (int ignored_argc, char **ignored_argv)
     }
   else
     {
-      fd = atoi (__argv[ARG_STDERR]);
+      fd = atoi (argv[ARG_STDERR]);
       if (fd != 2)
        {
          dup2 (fd, 2);
@@ -325,19 +324,19 @@ main (int ignored_argc, char **ignored_argv)
        }
     }
 
-  /* __argv[ARG_WORKING_DIRECTORY] is the directory in which to run the
+  /* argv[ARG_WORKING_DIRECTORY] is the directory in which to run the
    * process.  If "-", don't change directory.
    */
-  if (__argv[ARG_WORKING_DIRECTORY][0] == '-' &&
-      __argv[ARG_WORKING_DIRECTORY][1] == 0)
+  if (argv[ARG_WORKING_DIRECTORY][0] == '-' &&
+      argv[ARG_WORKING_DIRECTORY][1] == 0)
     ; /* Nothing */
   else if (_wchdir (wargv[ARG_WORKING_DIRECTORY]) < 0)
     write_err_and_exit (child_err_report_fd, CHILD_CHDIR_FAILED);
 
-  /* __argv[ARG_CLOSE_DESCRIPTORS] is "y" if file descriptors from 3
+  /* argv[ARG_CLOSE_DESCRIPTORS] is "y" if file descriptors from 3
    *  upwards should be closed
    */
-  if (__argv[ARG_CLOSE_DESCRIPTORS][0] == 'y')
+  if (argv[ARG_CLOSE_DESCRIPTORS][0] == 'y')
     for (i = 3; i < 1000; i++) /* FIXME real limit? */
       if (i != child_err_report_fd && i != helper_sync_fd)
         if (_get_osfhandle (i) != -1)
@@ -349,16 +348,16 @@ main (int ignored_argc, char **ignored_argv)
   child_err_report_fd = dup_noninherited (child_err_report_fd, _O_WRONLY);
   helper_sync_fd = dup_noninherited (helper_sync_fd, _O_RDONLY);
 
-  /* __argv[ARG_WAIT] is "w" to wait for the program to exit */
-  if (__argv[ARG_WAIT][0] == 'w')
+  /* argv[ARG_WAIT] is "w" to wait for the program to exit */
+  if (argv[ARG_WAIT][0] == 'w')
     mode = P_WAIT;
   else
     mode = P_NOWAIT;
 
-  /* __argv[ARG_USE_PATH] is "y" to use PATH, otherwise not */
+  /* argv[ARG_USE_PATH] is "y" to use PATH, otherwise not */
 
-  /* __argv[ARG_PROGRAM] is executable file to run,
-   * __argv[argv_zero_offset]... is its argv. argv_zero_offset equals
+  /* argv[ARG_PROGRAM] is executable file to run,
+   * argv[argv_zero_offset]... is its argv. argv_zero_offset equals
    * ARG_PROGRAM unless G_SPAWN_FILE_AND_ARGV_ZERO was used, in which
    * case we have a separate executable name and argv[0].
    */
@@ -368,7 +367,7 @@ main (int ignored_argc, char **ignored_argv)
    */
   protect_wargv (wargv + argv_zero_offset, &new_wargv);
 
-  if (__argv[ARG_USE_PATH][0] == 'y')
+  if (argv[ARG_USE_PATH][0] == 'y')
     handle = _wspawnvp (mode, wargv[ARG_PROGRAM], (const wchar_t **) new_wargv);
   else
     handle = _wspawnv (mode, wargv[ARG_PROGRAM], (const wchar_t **) new_wargv);
@@ -383,5 +382,7 @@ main (int ignored_argc, char **ignored_argv)
 
   read (helper_sync_fd, &c, 1);
 
+  g_strfreev (argv);
+
   return 0;
 }