usr/src/usr.bin/basename/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 this notice is preserved and that due credit is given
 * to the University of California at 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'' without express or implied warranty.
 */

#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  4.4 (Berkeley) %G%";
#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);
}