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-rw-r--r--dirname.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/dirname.c b/dirname.c
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index 0000000..77cb664
--- /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);
+}