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From: trost@reed.bitnet (Bill Trost)
Newsgroups: comp.sources.wanted,alt.sources.wanted
Subject: Re: Backwards cat [trick recursive main()]
Message-ID: <13772@reed.UUCP>
Date: 20 Dec 89 00:03:23 GMT
References: <6488@lindy.Stanford.EDU> <5840@eos.UUCP>
Sender: news@reed.UUCP
Distribution: usa
Lines: 49

>... then there's always (modulo stack death), the classic:
>
>	#include <stdio.h>
>
>	main() {
>    	    char line[BUFSIZ];
> 	
>    	    if (gets(line) == NULL)
>		return;
>    	    main();
>    	    puts(line);
>	}

But you forgot to handle arguments!

#include <stdio.h>

main(argc, argv)
char** argv;
{
    switch (argc) {
    default:
	main(argc - 1, argv + 1);
	/* FALLS THROUGH */
    case 2:
	if (argv[1][0] != '-' || argv[1][1] != '\0') {
	    FILE*	fp;

	    if (fp = fopen(argv[1])) {
		main(-1, (char **) fp);
		fclose(fp);
	    }
	    break;
	}
	/* FALLS THROUGH */
    case 1:
	main(-1, stdin);
	break;
    case -1:
	{
	    char line[BUFSIZ];

	    if (!fgets(line, BUFSIZ, (FILE *) argv))
		return;
	    main(argc, argv);
	    fputs(line, stdout);
	}
    }
}