4.3BSD-Tahoe/usr/src/usr.bin/basename.c

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)basename.c	4.5 (Berkeley) 6/29/88";
#endif /* not lint */

main(argc, argv)
	int argc;
	char **argv;
{
	register char *p, *t;
	char *base;

	if (argc <= 1) {	/* backward compatible */
		putchar('\n');
		exit(1);
	}
	for (p = base = *++argv; *p;)
		if (*p++ == '/')
			base = p;
	if (argc > 2) {		/* original version allows any # of args */
		for (t = *++argv; *t; ++t);
		do {
			if (t == *argv) {
				*p = '\0';
				break;
			}
		} while (p >= base && *--t == *--p);
	}
	puts(base);
	exit(0);
}