Fixing the ARG macros and adding nice.

Thanks "Galos, David" <galosd83@students.rowan.edu>!

Makefile

@@ -41,6 +41,7 @@ SRC = \
 	mkdir.c    \
 	mkfifo.c   \
 	mv.c       \
+	nice.c     \
 	nl.c       \
 	nohup.c    \
 	paste.c    \

arg.h

@@ -0,0 +1,55 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#ifndef __ARG_H__
+#define __ARG_H__
+
+extern char *argv0;
+
+#define USED(x)		((void)(x))
+
+/* use main(int argc, char *argv[]) */
+#define ARGBEGIN	for (argv0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][1]\
+					&& argv[0][0] == '-';\
+					argc--, argv++) {\
+				char _argc;\
+				char **_argv;\
+				int brk;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (brk = 0, argv[0]++, _argv = argv;\
+						argv[0][0] && !brk;\
+						argv[0]++) {\
+					if (_argv != argv)\
+						break;\
+					_argc = argv[0][0];\
+					switch (_argc)
+
+#define ARGEND			}\
+				USED(_argc);\
+			}\
+			USED(argv);\
+			USED(argc);
+
+#define ARGC()		_argc
+
+#define EARGF(x)	((argv[0][1] == '\0' && argv[1] == NULL)?\
+				((x), abort(), (char *)0) :\
+				(brk = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#define ARGF()		((argv[0][1] == '\0' && argv[1] == NULL)?\
+				(char *)0 :\
+				(brk = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#endif
+

util.h

@@ -1,5 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 
+#include "arg.h"
+
 #define UTF8_POINT(c) (((c) & 0xc0) != 0x80)
 
 #define MIN(x,y)  ((x) < (y) ? (x) : (y))
@@ -7,28 +9,6 @@
 
 #define LEN(x) (sizeof (x) / sizeof *(x))
 
-#define ARGBEGIN \
-	{ \
-		if(!argv0) \
-			argv0 = argv[0]; \
-		for(argc--, argv++; argv[0] && argv[0][0] == '-' && argv[0][1] != '\0'; argc--, argv++) { \
-			if(argv[0][1] == '-' && argv[0][2] == '\0') { /* -- signifies end of flags */ \
-				argc--; argv++; \
-				break; \
-			} \
-			for(argv[0]++; *argv[0] != '\0'; argv[0]++) \
-				switch(*argv[0])
-
-#define ARGEND \
-		} \
-	}
-
-#define ARGC()    (*argv[0])
-#define ARGF()    (*argv[0] ? argv[0] \
-                  : argv[1] ? (argc--, *++argv) : NULL)
-#define EARGF(x)  (*argv[0] ? argv[0] \
-                  : argv[1] ? (argc--, *++argv) : ((x), abort(), NULL))
-
 extern char *argv0;
 
 char *agetcwd(void);