[hackers] [quark][PATCH 2/7] arg.h: more readable NULL pointer

---
 arg.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arg.h b/arg.h
index 5444aad..d983ebf 100644
--- a/arg.h
+++ b/arg.h
_AT_@ -22,7 +22,7 @@
 extern char *argv0;
 
 /* int main(int argc, char *argv[]) */
-#define ARGBEGIN for (argv0 = *argv, *argv ? (argc--, argv++) : ((void *)0);      \
+#define ARGBEGIN for (argv0 = *argv, *argv ? (argc--, argv++) : (NULL);           \
                       *argv && (*argv)[0] == '-' && (*argv)[1]; argc--, argv++)   \
                  {                                                                \
                  	int i_, argused_;                                         \
_AT_@ -46,7 +46,7 @@ extern char *argv0;
 #define ARGC()   ((*argv)[i_])
 #define ARGF_(x) (((*argv)[i_ + 1]) ? (argused_ = 1, &((*argv)[i_ + 1])) :        \
                   (*(argv + 1))     ? (argused_ = 1, *(argv + 1))        : (x))
-#define EARGF(x) ARGF_(((x), exit(1), (char *)0))
-#define ARGF()   ARGF_((char *)0)
+#define EARGF(x) ARGF_(((x), exit(1), NULL))
+#define ARGF()   ARGF_(NULL)
 
 #endif
-- 
2.31.1