mingw: add magic '--busybox' flag

If BusyBox is invoked with argv[1] set to --busybox skip the first
two arguments so that argv[2] becomes the applet name and argv[3]
et seq are its arguments.

This is needed when BusyBox is run as sh.exe and the executable is
reexecuted to invoke compress/decompress applets.

1 files changed, 4 insertions, 0 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 841494a70..e99d3a5c4 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -864,6 +864,10 @@ int main(int argc UNUSED_PARAM, char **argv)
                         applet_name = applet_name_env;
                         unsetenv("BUSYBOX_APPLET_NAME");
                 }
+                else if ( argv[1] && argv[2] && strcmp(argv[1], "--busybox") == 0 ) {
+                        argv += 2;
+                        applet_name = argv[0];
+                }
                 else {
                         char *s = argv[0];
                         int i, len = strlen(s);