From 5f673cf82ec37d28bade0c72b3da96eaf1305166 Mon Sep 17 00:00:00 2001
From: jmallett <jmallett@FreeBSD.org>
Date: Mon, 23 Sep 2002 06:47:39 +0000
Subject: Use some macro evil to create the functions for using sysctl(3) to
 get each variable natively.  It should allow you to use any sysctl mib set,
 but due to limitations of what I can do with macros, right now it's limited
 to two, which is all this program used anyway.

Sponsored by:	Bright Path Solutions
---
 usr.bin/uname/uname.c | 121 ++++++++++++++++----------------------------------
 1 file changed, 38 insertions(+), 83 deletions(-)

(limited to 'usr.bin/uname/uname.c')

diff --git a/usr.bin/uname/uname.c b/usr.bin/uname/uname.c
index 7078fc3..a80d4f3 100644
--- a/usr.bin/uname/uname.c
+++ b/usr.bin/uname/uname.c
@@ -84,6 +84,7 @@ main(int argc, char *argv[])
 	int ch;
 
 	setup_get();
+	flags = 0;
 
 	while ((ch = getopt(argc, argv, "amnprsv")) != -1)
 		switch(ch) {
@@ -169,99 +170,53 @@ print_uname(u_int flags)
 	printf("\n");
 }
 
-void
-native_sysname(void)
-{
-	int mib[2];
-	size_t len;
-	static char buf[1024];
-
-	mib[0] = CTL_KERN;
-	mib[1] = KERN_OSTYPE;
-	len = sizeof(buf);
-	if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
+#define	NATIVE_SYSCTL2_GET(var,mib0,mib1)	\
+void						\
+native_##var(void)				\
+{						\
+	int mib[] = { (mib0), (mib1) };		\
+	size_t len;				\
+	static char buf[1024];			\
+	char **varp = &(var);			\
+						\
+	len = sizeof buf;			\
+	if (sysctl(mib, sizeof mib / sizeof mib[0],	\
+	   &buf, &len, NULL, 0) == -1)		\
 		err(1, "sysctl");
-	sysname = buf;
-}
 
-void
-native_hostname(void)
-{
-	int mib[2];
-	size_t len;
-	static char buf[1024];
-
-	mib[0] = CTL_KERN;
-	mib[1] = KERN_HOSTNAME;
-	len = sizeof(buf);
-	if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
-		err(1, "sysctl");
-	hostname = buf;
-}
+#define	NATIVE_SET				\
+	*varp = buf;				\
+	return;					\
+}	struct __hack
 
-void
-native_release(void)
-{
-	int mib[2];
-	size_t len;
-	static char buf[1024];
-
-	mib[0] = CTL_KERN;
-	mib[1] = KERN_OSRELEASE;
-	len = sizeof(buf);
-	if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
-		err(1, "sysctl");
-	release = buf;
-}
+#define	NATIVE_BUFFER	(buf)
+#define	NATIVE_LENGTH	(len)
 
-void
-native_version(void)
-{
-	int mib[2];
-	size_t len, tlen;
+NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
+} NATIVE_SET;
+
+NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
+} NATIVE_SET;
+
+NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
+} NATIVE_SET;
+
+NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
+	size_t n;
 	char *p;
-	static char buf[1024];
 
-	mib[0] = CTL_KERN;
-	mib[1] = KERN_VERSION;
-	len = sizeof(buf);
-	if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
-		err(1, "sysctl");
-	for (p = buf, tlen = len; tlen--; ++p)
+	p = NATIVE_BUFFER;
+	n = NATIVE_LENGTH;
+	for (; n--; ++p)
 		if (*p == '\n' || *p == '\t')
 			*p = ' ';
-	version = buf;
-}
+} NATIVE_SET;
 
-void
-native_platform(void)
-{
-	int mib[2];
-	size_t len;
-	static char buf[1024];
-
-	mib[0] = CTL_HW;
-	mib[1] = HW_MACHINE;
-	len = sizeof(buf);
-	if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
-		err(1, "sysctl");
-	platform = buf;
-}
+NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
+} NATIVE_SET;
 
-void
-native_arch(void)
-{
-	int mib[2];
-	size_t len;
-	static char buf[1024];
-
-	mib[0] = CTL_HW;
-	mib[1] = HW_MACHINE_ARCH;
-	len = sizeof(buf);
-	if (sysctl(mib, 2, &buf, &len, NULL, 0) == -1)
-		err(1, "sysctl");
-	arch = buf;
-}
+NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
+} NATIVE_SET;
 
 void
 usage(void)
-- 
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