From: Johannes Schindelin <johannes.schindelin@xxxxxx>
Git for Windows has special code to retrieve the command-line parameters
(and even the environment) in UTF-16 encoding, so that they can be
converted to UTF-8. This is necessary because Git for Windows wants to
use UTF-8 encoded strings throughout its code, and the main() function
does not get the parameters in that encoding.
To do that, we used the __wgetmainargs() function, which is not even a
Win32 API function, but provided by the MINGW "runtime" instead.
Obviously, this method would not work with any compiler other than GCC,
and in preparation for compiling with Visual C++, we would like to avoid
precisely that.
Lucky us, there is a much more elegant way: we can simply implement the
UTF-16 variant of `main()`: `wmain()`.
To make that work, we need to link with -municode. The command-line
parameters are passed to `wmain()` encoded in UTF-16, as desired, and
this method also works with GCC, and also with Visual C++ after
adjusting the MSVC linker flags to force it to use `wmain()`.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
compat/mingw.c | 53 +++++++++++++++++++++++++++++++-----------------
compat/mingw.h | 22 ++++++++++----------
config.mak.uname | 3 ++-
3 files changed, 47 insertions(+), 31 deletions(-)
diff --git a/compat/mingw.c b/compat/mingw.c
index 9b6d2400e1..0d8713e515 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -2301,18 +2301,13 @@ static void setup_windows_environment(void)
setenv("TERM", "cygwin", 1);
}
+#if !defined(_MSC_VER)
/*
* Disable MSVCRT command line wildcard expansion (__getmainargs called from
* mingw startup code, see init.c in mingw runtime).
*/
int _CRT_glob = 0;
-
-typedef struct {
- int newmode;
-} _startupinfo;
-
-extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
- _startupinfo *si);
+#endif
static NORETURN void die_startup(void)
{
@@ -2390,22 +2385,25 @@ static void maybe_redirect_std_handles(void)
GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
}
-void mingw_startup(void)
+/*
+ * We implement wmain() and compile with -municode, which would
+ * normally ignore main(), but we call the latter from the former
+ * so that we can handle non-ASCII command-line parameters
+ * appropriately.
+ *
+ * To be more compatible with the core git code, we convert
+ * argv into UTF8 and pass them directly to main().
+ */
+int wmain(int argc, const wchar_t **wargv)
{
- int i, maxlen, argc;
- char *buffer;
- wchar_t **wenv, **wargv;
- _startupinfo si;
+ int i, maxlen, exit_status;
+ char *buffer, **save;
+ const char **argv;
trace2_initialize_clock();
maybe_redirect_std_handles();
- /* get wide char arguments and environment */
- si.newmode = 0;
- if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
- die_startup();
-
/* determine size of argv and environ conversion buffer */
maxlen = wcslen(wargv[0]);
for (i = 1; i < argc; i++)
@@ -2415,9 +2413,16 @@ void mingw_startup(void)
maxlen = 3 * maxlen + 1;
buffer = malloc_startup(maxlen);
- /* convert command line arguments and environment to UTF-8 */
+ /*
+ * Create a UTF-8 version of w_argv. Also create a "save" copy
+ * to remember all the string pointers because parse_options()
+ * will remove claimed items from the argv that we pass down.
+ */
+ ALLOC_ARRAY(argv, argc + 1);
+ ALLOC_ARRAY(save, argc + 1);
for (i = 0; i < argc; i++)
- __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
+ argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
+ argv[i] = save[i] = NULL;
free(buffer);
/* fix Windows specific environment settings */
@@ -2436,6 +2441,16 @@ void mingw_startup(void)
/* initialize Unicode console */
winansi_init();
+
+ /* invoke the real main() using our utf8 version of argv. */
+ exit_status = main(argc, argv);
+
+ for (i = 0; i < argc; i++)
+ free(save[i]);
+ free(save);
+ free(argv);
+
+ return exit_status;
}
int uname(struct utsname *buf)
diff --git a/compat/mingw.h b/compat/mingw.h
index 593bdbffe6..210f1b01a8 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -562,18 +562,18 @@ int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen);
extern CRITICAL_SECTION pinfo_cs;
/*
- * A replacement of main() that adds win32 specific initialization.
+ * Git, like most portable C applications, implements a main() function. On
+ * Windows, this main() function would receive parameters encoded in the
+ * current locale, but Git for Windows would prefer UTF-8 encoded parameters.
+ *
+ * To make that happen, we still declare main() here, and then declare and
+ * implement wmain() (which is the Unicode variant of main()) and compile with
+ * -municode. This wmain() function reencodes the parameters from UTF-16 to
+ * UTF-8 format, sets up a couple of other things as required on Windows, and
+ * then hands off to the main() function.
*/
-
-void mingw_startup(void);
-#define main(c,v) dummy_decl_mingw_main(void); \
-static int mingw_main(c,v); \
-int main(int argc, const char **argv) \
-{ \
- mingw_startup(); \
- return mingw_main(__argc, (void *)__argv); \
-} \
-static int mingw_main(c,v)
+int wmain(int argc, const wchar_t **w_argv);
+int main(int argc, const char **argv);
/*
* Used by Pthread API implementation for Windows
diff --git a/config.mak.uname b/config.mak.uname
index b71688eeb7..bf5d160ef4 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -401,7 +401,7 @@ ifeq ($(uname_S),Windows)
compat/win32/trace2_win32_process_info.o \
compat/win32/dirent.o
COMPAT_CFLAGS = -D__USE_MINGW_ACCESS -DNOGDI -DHAVE_STRING_H -Icompat -Icompat/regex -Icompat/win32 -DSTRIP_EXTENSION=\".exe\"
- BASIC_LDFLAGS = -IGNORE:4217 -IGNORE:4049 -NOLOGO -SUBSYSTEM:CONSOLE
+ BASIC_LDFLAGS = -IGNORE:4217 -IGNORE:4049 -NOLOGO -ENTRY:wmainCRTStartup -SUBSYSTEM:CONSOLE
EXTLIBS = user32.lib advapi32.lib shell32.lib wininet.lib ws2_32.lib invalidcontinue.obj
PTHREAD_LIBS =
lib =
@@ -548,6 +548,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
ETAGS_TARGET = ETAGS
NO_POSIX_GOODIES = UnfortunatelyYes
DEFAULT_HELP_FORMAT = html
+ BASIC_LDFLAGS += -municode
COMPAT_CFLAGS += -DNOGDI -Icompat -Icompat/win32
COMPAT_CFLAGS += -DSTRIP_EXTENSION=\".exe\"
COMPAT_OBJS += compat/mingw.o compat/winansi.o \
--
gitgitgadget
