win32: scripting utils.get_env_list(): use UTF-8

lua/js utils.get_env_list() uses `environ' which was ANSI, thus
it broke any unicode names/values.

mpv already has an internal utf8_environ for win32, but it's used
only at the getenv(..) wrapper and not exposed in itself, and also it
has lazy initialization - on first getenv() call.

Now `environ' maps to a function which ensures initialization while
keeping it an l-value (like posix expects).

The cost of this fuglyness is that files should include osdep/io.h
(which now declares environ as extern) rather than declaring it
themselves, or else the build will break on mingw.

1 files changed, 6 insertions, 0 deletions

diff --git a/osdep/io.c b/osdep/io.c
index db61a705fd..d4dcfc6fba 100644
--- a/osdep/io.c
+++ b/osdep/io.c
@@ -682,6 +682,12 @@ char *mp_getenv(const char *name)
     return NULL;
 }
 
+char ***mp_penviron()
+{
+    mp_getenv("");  // ensure init
+    return &utf8_environ;  // `environ' should be an l-value
+}
+
 off_t mp_lseek(int fd, off_t offset, int whence)
 {
     HANDLE h = (HANDLE)_get_osfhandle(fd);