[rtems-libbsd commit] trimdomain.c: New file in libutil
Joel Sherrill
joel at rtems.org
Tue Oct 23 16:09:59 UTC 2012
Module: rtems-libbsd
Branch: master
Commit: 4b8600a006dd09aee0df21ce1fa9e1789edfce15
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=4b8600a006dd09aee0df21ce1fa9e1789edfce15
Author: Joel Sherrill <joel.sherrill at oarcorp.com>
Date: Mon Oct 22 10:51:44 2012 -0500
trimdomain.c: New file in libutil
---
freebsd-userspace/lib/libutil/trimdomain.3 | 85 ++++++++++++++++++++
freebsd-userspace/lib/libutil/trimdomain.c | 118 ++++++++++++++++++++++++++++
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 0000000..8d600c0
--- /dev/null
+++ b/freebsd-userspace/lib/libutil/trimdomain.3
@@ -0,0 +1,85 @@
+.\" Copyright (c) 1999 Brian Somers <brian at 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 0000000..7ca6ab6
--- /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 at Awfulhak.org>
+ * Based on original work by Atsushi Murai <amurai at 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);
+}
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