1 files changed, 146 insertions, 0 deletions

diff --git a/dirname.c b/dirname.c
new file mode 100644
index 000000000..77cb664ac
--- /dev/null
+++ b/dirname.c
@@ -0,0 +1,146 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * This is temporary -- needs to be rewritten to be tighter */
+/*
+ * Copyright (c) 1991, 1993, 1994
+ *      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.
+ */
+
+#if 0
+#ifndef lint
+static char copyright[] = "@(#) Copyright (c) 1991, 1993, 1994\n\
+        The Regents of the University of California.  All rights reserved.\n";
+#endif                                                  /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)dirname.c   8.4 (Berkeley) 5/4/95";
+#endif                                                  /* not lint */
+#endif                                                  /* #if 0 */
+
+#include "internal.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void dirname_usage()
+{
+
+        (void) fprintf(stderr, "usage: dirname path\n");
+        exit(1);
+}
+
+extern int dirname_main(argc, argv)
+int argc;
+char **argv;
+{
+        char *p;
+        int ch;
+
+        while ((ch = getopt(argc, argv, "")) != -1)
+                switch (ch) {
+                case '?':
+                default:
+                        dirname_usage();
+                }
+        argc -= optind;
+        argv += optind;
+
+        if (argc != 1)
+                dirname_usage();
+
+        /*
+         * (1) If string is //, skip steps (2) through (5).
+         * (2) If string consists entirely of slash characters, string
+         *     shall be set to a single slash character.  In this case,
+         *     skip steps (3) through (8).
+         */
+        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 == '/')
+                continue;
+        *++p = '\0';
+
+        /*
+         * (4) If there are no slash characters remaining in string,
+         *     string shall be set to a single period character.  In this
+         *     case skip steps (5) through (8).
+         *
+         * (5) If there are any trailing nonslash characters in string,
+         *     they shall be removed.
+         */
+        while (--p >= *argv)
+                if (*p == '/')
+                        break;
+        ++p;
+        if (p == *argv) {
+                (void) printf(".\n");
+                exit(0);
+        }
+
+        /*
+         * (6) If the remaining string is //, it is implementation defined
+         *     whether steps (7) and (8) are skipped or processed.
+         *
+         * This case has already been handled, as part of steps (1) and (2).
+         */
+
+        /*
+         * (7) If there are any trailing slash characters in string, they
+         *     shall be removed.
+         */
+        while (--p >= *argv)
+                if (*p != '/')
+                        break;
+        ++p;
+
+        /*
+         * (8) If the remaining string is empty, string shall be set to
+         *     a single slash character.
+         */
+        *p = '\0';
+        (void) printf("%s\n", p == *argv ? "/" : *argv);
+        exit(0);
+}