[PATCH] Confstr port to RTEMS-Libbsd

[Eshan dhawan]

The file is taken from FreeBSD
and added to lib/libc/gen

Update #3373

Signed-off-by: Eshan dhawan <eshandhawan51 at gmail.com>
---
 freebsd/lib/libc/gen/confstr.c | 127 +++++++++++++++++++++++++++++++++
 libbsd.py                      |   1 +
 2 files changed, 128 insertions(+)
 create mode 100644 freebsd/lib/libc/gen/confstr.c

diff --git a/freebsd/lib/libc/gen/confstr.c b/freebsd/lib/libc/gen/confstr.c
new file mode 100644
index 00000000..653f581b
--- /dev/null
+++ b/freebsd/lib/libc/gen/confstr.c
@@ -0,0 +1,127 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1993
+ *	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. 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.
+ */
+
+#include <sys/cdefs.h>
+__SCCSID("@(#)confstr.c	8.1 (Berkeley) 6/4/93");
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <paths.h>
+#include <string.h>
+#include <unistd.h>
+
+
+size_t
+confstr(int name, char *buf, size_t len)
+{
+	const char *p;
+	const char UPE[] = "unsupported programming environment";
+
+	switch (name) {
+#ifndef __rtems__
+	case _CS_PATH:
+		p = _PATH_STDPATH;
+		goto docopy;
+#endif
+		/*
+		 * POSIX/SUS ``Programming Environments'' stuff
+		 *
+		 * We don't support more than one programming environment
+		 * on any platform (yet), so we just return the empty
+		 * string for the environment we are compiled for,
+		 * and the string "unsupported programming environment"
+		 * for anything else.  (The Standard says that if these
+		 * values are used on a system which does not support
+		 * this environment -- determined via sysconf() -- then
+		 * the value we return is unspecified.  So, we return
+		 * something which will cause obvious breakage.)
+		 */
+	case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
+	case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
+	case _CS_POSIX_V6_ILP32_OFF32_LIBS:
+	case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
+	case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
+	case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
+		/*
+		 * These two environments are never supported.
+		 */
+		p = UPE;
+		goto docopy;
+
+	case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
+	case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
+	case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
+#ifndef __rtems__
+	if (sizeof(long) * CHAR_BIT == 32 &&
+		    sizeof(off_t) > sizeof(long))
+			p = "";
+		else
+#endif
+			p = UPE;
+		goto docopy;
+
+	case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
+	case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
+	case _CS_POSIX_V6_LP64_OFF64_LIBS:
+#ifndef __rtems__
+		if (sizeof(long) * CHAR_BIT >= 64 &&
+		    sizeof(void *) * CHAR_BIT >= 64 &&
+		    sizeof(int) * CHAR_BIT >= 32 &&
+		    sizeof(off_t) >= sizeof(long))
+			p = "";
+		else
+#endif
+			p = UPE;
+		goto docopy;
+#ifndef __rtems__
+	case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS:
+		/* XXX - should have more complete coverage */
+		if (sizeof(long) * CHAR_BIT >= 64)
+			p = "_POSIX_V6_LP64_OFF64";
+		else
+			p = "_POSIX_V6_ILP32_OFFBIG";
+		goto docopy;
+#endif
+
+docopy:
+		if (len != 0 && buf != NULL)
+			strlcpy(buf, p, len);
+		return (strlen(p) + 1);
+
+	default:
+		errno = EINVAL;
+		return (0);
+	}
+	/* NOTREACHED */
+}
diff --git a/libbsd.py b/libbsd.py
index 812674a6..9beba660 100644
--- a/libbsd.py
+++ b/libbsd.py
@@ -2952,6 +2952,7 @@ class user_space(builder.Module):
                 'lib/libc/gen/getdomainname.c',
                 'lib/libc/gen/gethostname.c',
                 'lib/libc/gen/sethostname.c',
+                'lib/libc/gen/confstr.c',
                 'lib/libc/inet/inet_addr.c',
                 'lib/libc/inet/inet_cidr_ntop.c',
                 'lib/libc/inet/inet_cidr_pton.c',
-- 
2.17.1