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	tadd arg.h - granular - granular dynamics simulation
	git clone git://src.adamsgaard.dk/granular
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	---
	commit e9d0900081d592028d4f522e50d22ddd51209c73
	parent 5c5dd722931a8ce81829b023ffa16a92f0872de1
	Author: Anders Damsgaard <[email protected]>
	Date: Thu, 18 Mar 2021 00:15:21 +0100

	add arg.h

	Diffstat:
	A arg.h \| 38 +++++++++++++++++++++++++++++…

	1 file changed, 38 insertions(+), 0 deletions(-)
	---
	diff --git a/arg.h b/arg.h
	t@@ -0,0 +1,38 @@
	+/* by 20h */
	+#ifndef ARG_H
	+#define ARG_H
	+
	+#define USED(x) ((void)(x))
	+
	+extern char *argv0;
	+
	+#define ARGBEGIN for(argv0 = *argv, argv++, argc--;\
	+ argv[0] && argv[0][0] == '-'\
	+ && argv[0][1];\
	+ argc--, argv++) {\
	+ char _argc;\
	+ char **_argv;\
	+ if(argv[0][1] == '-' && argv[0][2] == '\0') {\
	+ argv++;\
	+ argc--;\
	+ break;\
	+ }\
	+ int i_;\
	+ for(i_ = 1, _argv = argv; argv[0][i_];\
	+ i_++) {\
	+ if(_argv != argv)\
	+ break;\
	+ _argc = argv[0][i_];\
	+ switch(_argc)
	+
	+#define ARGEND }\
	+ USED(_argc);\
	+ }\
	+ USED(argv);\
	+ USED(argc);
	+
	+#define EARGF(x) ((argv[1] == NULL)? ((x), abort(), (char *)0) :\
	+ (argc--, argv++, argv[0]))
	+
	+#endif
	+