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: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may 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 MERCHANTABILITY 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  4.7 (Berkeley) 6/1/90";
#endif /* not lint */

#include <stdio.h>

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

        if (argc < 2 || argc > 3) {
                fprintf(stderr, "usage: basename string [suffix]\n");
                exit(1);
        }
        for (p = base = *++argv; *p;)
                if (*p++ == '/')
                        base = p;
        if (argc == 3) {
                for (t = *++argv; *t; ++t);
                do {
                        if (t == *argv) {
                                *p = '\0';
                                break;
                        }
                } while (p >= base && *--t == *--p);
        }
        printf("%s\n", base);
        exit(0);
}