Import XPG4-compliant basename(3) and dirname(3) from OpenBSD.

The man pages need some adjustments.

PR:		12960, 12962
Submitted by:	James Howard <howardjp@wam.umd.edu>
Obtained from:	OpenBSD

1 files changed, 76 insertions, 0 deletions

diff --git a/lib/libc/gen/basename.c b/lib/libc/gen/basename.c
new file mode 100644
index 0000000..b68ef3f
--- /dev/null
+++ b/lib/libc/gen/basename.c
@@ -0,0 +1,76 @@
+/*	$OpenBSD: basename.c,v 1.4 1999/05/30 17:10:30 espie Exp $	*/
+/*	$FreeBSD$	*/
+
+/*
+ * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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
+static char rcsid[] = "$OpenBSD: basename.c,v 1.4 1999/05/30 17:10:30 espie Exp $";
+#endif /* not lint */
+
+#include <errno.h>
+#include <libgen.h>
+#include <string.h>
+#include <sys/param.h>
+
+char *
+basename(path)
+	const char *path;
+{
+	static char bname[MAXPATHLEN];
+	register const char *endp, *startp;
+
+	/* Empty or NULL string gets treated as "." */
+	if (path == NULL || *path == '\0') {
+		(void)strcpy(bname, ".");
+		return(bname);
+	}
+
+	/* Strip trailing slashes */
+	endp = path + strlen(path) - 1;
+	while (endp > path && *endp == '/')
+		endp--;
+
+	/* All slashes becomes "/" */
+	if (endp == path && *endp == '/') {
+		(void)strcpy(bname, "/");
+		return(bname);
+	}
+
+	/* Find the start of the base */
+	startp = endp;
+	while (startp > path && *(startp - 1) != '/')
+		startp--;
+
+	if (endp - startp + 1 > sizeof(bname)) {
+		errno = ENAMETOOLONG;
+		return(NULL);
+	}
+	(void)strncpy(bname, startp, endp - startp + 1);
+	bname[endp - startp + 1] = '\0';
+	return(bname);
+}