Users: add support for Windows

src/detection/users/users_linux.c

@@ -0,0 +1,36 @@
+#include "fastfetch.h"
+#include "users.h"
+
+#if FF_HAVE_UTMPX_H
+    #include <utmpx.h>
+#else
+    //for Android compatibility
+    #include <utmp.h>
+    #define utmpx utmp
+    #define setutxent setutent
+    #define getutxent getutent
+#endif
+
+void ffDetectUsers(FFlist* users, FFstrbuf* error)
+{
+    struct utmpx* n = NULL;
+    setutxent();
+
+next:
+    while((n = getutxent()))
+    {
+        if(n->ut_type != USER_PROCESS)
+            continue;
+
+        for(uint32_t i = 0; i < users->length; ++i)
+        {
+            if(ffStrbufCompS((FFstrbuf*)ffListGet(users, i), n->ut_user) == 0)
+                goto next;
+        }
+
+        ffStrbufInitS((FFstrbuf*)ffListAdd(users), n->ut_user);
+    }
+
+    if(users->length == 0)
+        ffStrbufAppendS(error, "Unable to detect users");
+}