win32: appletlib: special way to recognize applet name on Windows

argv[0] on Windows is always the executable path. We can't rely on it
to extract the applet name. For single busybox executable, just pass
an environment variable, BUSYBOX_APPLET_NAME.

Also strip .exe suffix when looking for applet name.

1 files changed, 12 insertions, 0 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 2d52c3db9..f287e4522 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -806,6 +806,18 @@ int main(int argc UNUSED_PARAM, char **argv)
         applet_name = argv[0];
         if (applet_name[0] == '-')
                 applet_name++;
+        if (ENABLE_PLATFORM_MINGW32) {
+                const char *applet_name_env = getenv("BUSYBOX_APPLET_NAME");
+                if (applet_name_env && *applet_name_env) {
+                        applet_name = applet_name_env;
+                        unsetenv("BUSYBOX_APPLET_NAME");
+                }
+                else {
+                        int len = strlen(applet_name);
+                        if (len > 4 && !strcmp(applet_name+len-4, ".exe"))
+                                argv[0][applet_name-argv[0]+len-4] = '\0';
+                }
+        }
         applet_name = bb_basename(applet_name);
 
         parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */