trimdomain.c: New file in libutil

2 files changed, 203 insertions, 0 deletions

diff --git a/freebsd-userspace/lib/libutil/trimdomain.3 b/freebsd-userspace/lib/libutil/trimdomain.3
new file mode 100644
index 00000000..8d600c01
--- /dev/null
+++ b/freebsd-userspace/lib/libutil/trimdomain.3
@@ -0,0 +1,85 @@
+.\" Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd April 7, 1999
+.Dt TRIMDOMAIN 3
+.Os
+.Sh NAME
+.Nm trimdomain
+.Nd "trim the current domain name from a host name"
+.Sh LIBRARY
+.Lb libutil
+.Sh SYNOPSIS
+.In sys/types.h
+.In libutil.h
+.Ft void
+.Fn trimdomain "char *fullhost" "int hostsize"
+.Sh DESCRIPTION
+The function
+.Fn trimdomain
+removes the current domain name from the passed
+.Ar fullhost
+name by writing a
+.Dv NUL
+character over the first period of the passed name.
+The current domain
+name is determined by calling
+.Xr gethostname 3
+and removing everything up to the first period.
+The name is determined
+the first time this function is called and is cached for future use.
+.Pp
+The
+.Fn trimdomain
+function will only trim the domain name if the passed
+.Ar fullname
+ends with the current domain name and if the length of the resulting host
+name does not exceed
+.Ar hostsize .
+.Pp
+If the passed
+.Ar fullname
+is actually a
+.Dv DISPLAY
+specification of the form
+.Sm off
+.Ar host . domain : nn Oo .
+.Ar nn
+.Oc
+.Sm on
+and the domain name is the same as the local domain name,
+.Fn trimdomain
+will remove the embedded domain name, copying the screen and display
+numbers to the end of the base host name and resulting in
+.Sm off
+.Ar host : nn Op . Ar nn .
+.Sm on
+.Sh RETURN VALUES
+The
+.Fn trimdomain
+function does not return a value.
+.Sh SEE ALSO
+.Xr gethostname 3
diff --git a/freebsd-userspace/lib/libutil/trimdomain.c b/freebsd-userspace/lib/libutil/trimdomain.c
new file mode 100644
index 00000000..7ca6ab69
--- /dev/null
+++ b/freebsd-userspace/lib/libutil/trimdomain.c
@@ -0,0 +1,118 @@
+#ifdef __rtems__
+#include "port_before.h"
+#endif
+/*-
+ * Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
+ *   Based on original work by Atsushi Murai <amurai@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+
+#include <libutil.h>
+#include <string.h>
+#include <unistd.h>
+
+static int	isDISP(const char *);
+
+/*-
+ * Trim the current domain name from fullhost, but only if the result
+ * is less than or equal to hostsize in length.
+ *
+ * This function understands $DISPLAY type fullhosts.
+ *
+ * For example:
+ *
+ *     trimdomain("abcde.my.domain", 5)       ->   "abcde"
+ *     trimdomain("abcde.my.domain", 4)       ->   "abcde.my.domain"
+ *     trimdomain("abcde.my.domain:0.0", 9)   ->   "abcde:0.0"
+ *     trimdomain("abcde.my.domain:0.0", 8)   ->   "abcde.my.domain:0.0"
+ */
+void
+trimdomain(char *fullhost, int hostsize)
+{
+	static size_t dlen;
+	static int first = 1;
+	static char domain[MAXHOSTNAMELEN];
+	char *end, *s;
+	size_t len;
+
+	if (first) {
+		/* XXX: Should we assume that our domain is this persistent ? */
+		first = 0;
+		if (gethostname(domain, sizeof(domain) - 1) == 0 &&
+		    (s = strchr(domain, '.')) != NULL)
+			memmove(domain, s + 1, strlen(s + 1) + 1);
+		else
+			domain[0] = '\0';
+		dlen = strlen(domain);
+	}
+
+	if (domain[0] == '\0')
+		return;
+
+	s = fullhost;
+	end = s + hostsize + 1;
+	if ((s = memchr(s, '.', (size_t)(end - s))) != NULL) {
+		if (strncasecmp(s + 1, domain, dlen) == 0) {
+			if (s[dlen + 1] == '\0') {
+				/* Found -- lose the domain. */
+				*s = '\0';
+			} else if (s[dlen + 1] == ':' &&
+			    isDISP(s + dlen + 2) &&
+			    (len = strlen(s + dlen + 1)) < (size_t)(end - s)) {
+				/* Found -- shuffle the DISPLAY back. */
+				memmove(s, s + dlen + 1, len + 1);
+			}
+		}
+	}
+}
+
+/*
+ * Is the given string NN or NN.NN where ``NN'' is an all-numeric string ?
+ */
+static int
+isDISP(const char *disp)
+{
+	size_t w;
+	int res;
+
+	w = strspn(disp, "0123456789");
+	res = 0;
+	if (w > 0) {
+		if (disp[w] == '\0')
+			res = 1;	/* NN */
+		else if (disp[w] == '.') {
+			disp += w + 1;
+			w = strspn(disp, "0123456789");
+			if (w > 0 && disp[w] == '\0')
+				res = 1;	/* NN.NN */
+		}
+	}
+	return (res);
+}