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- /*-
- * Copyright (c) 1991 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- char copyright[] =
- "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)basename.c 5.1 (Berkeley) 3/9/91";
- #endif /* not lint */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- main(argc, argv)
- int argc;
- char **argv;
- {
- extern int optind;
- register char *p;
- int ch;
-
- while ((ch = getopt(argc, argv, "")) != EOF)
- switch(ch) {
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
-
- if (argc != 1 && argc != 2)
- usage();
-
- /*
- * (1) If string is // it is implementation defined whether steps (2)
- * through (5) are skipped or processed.
- *
- * (2) If string consists entirely of slash characters, string shall
- * be set to a single slash character. In this case, skip steps
- * (3) through (5).
- */
- for (p = *argv;; ++p) {
- if (!*p) {
- if (p > *argv)
- (void)printf("/\n");
- else
- (void)printf("\n");
- exit(0);
- }
- if (*p != '/')
- break;
- }
-
- /*
- * (3) If there are any trailing slash characters in string, they
- * shall be removed.
- */
- for (; *p; ++p);
- while (*--p == '/');
- *++p = '\0';
-
- /*
- * (4) If there are any slash characters remaining in string, the
- * prefix of string up to an including the last slash character
- * in string shall be removed.
- */
- while (--p >= *argv)
- if (*p == '/')
- break;
- ++p;
-
- /*
- * (5) If the suffix operand is present, is not identical to the
- * characters remaining in string, and is identical to a suffix
- * of the characters remaining in string, the suffix suffix
- * shall be removed from string.
- */
- if (*++argv) {
- int suffixlen, stringlen, off;
-
- suffixlen = strlen(*argv);
- stringlen = strlen(p);
-
- if (suffixlen < stringlen) {
- off = stringlen - suffixlen;
- if (!strcmp(p + off, *argv))
- p[off] = '\0';
- }
- }
- (void)printf("%s\n", p);
- exit(0);
- }
-
- usage()
- {
- (void)fprintf(stderr, "usage: basename string [suffix]\n");
- exit(1);
- }
-