Factor out DUID identification code so that it can easily be reused.

ok krw@

src/lib/libutil/Makefile

@@ -1,11 +1,11 @@
-#	$OpenBSD: Makefile,v 1.31 2010/05/26 16:44:32 nicm Exp $
+#	$OpenBSD: Makefile,v 1.32 2010/11/15 15:07:40 jsing Exp $
 #	$NetBSD: Makefile,v 1.8 1996/05/16 07:03:28 thorpej Exp $
 
 LIB=	util
 WANTLINT=
 
 HDRS=	util.h imsg.h
-SRCS=	check_expire.c getmaxpartitions.c getrawpartition.c login.c \
+SRCS=	check_expire.c duid.c getmaxpartitions.c getrawpartition.c login.c \
 	login_tty.c logout.c logwtmp.c opendev.c passwd.c pty.c readlabel.c \
 	login_fbtab.c uucplock.c fparseln.c opendisk.c pidfile.c \
 	fmt_scaled.c imsg.c imsg-buffer.c
@@ -61,8 +61,8 @@ MLINKS+=fmt_scaled.3 scan_scaled.3
 includes:
 	@cd ${.CURDIR}; for i in $(HDRS); do \
 	    j="cmp -s $$i ${DESTDIR}/usr/include/$$i || \
-		${INSTALL} ${INSTALL_COPY} -o ${BINOWN} -g ${BINGRP} -m 444 $$i \
-		${DESTDIR}/usr/include"; \
+		${INSTALL} ${INSTALL_COPY} -o ${BINOWN} -g ${BINGRP} \
+		-m 444 $$i ${DESTDIR}/usr/include"; \
 	    echo $$j; \
 	    eval "$$j"; \
 	done

src/lib/libutil/duid.c

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2010 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+
+#include "util.h"
+
+int
+isduid(const char *duid, int dflags)
+{
+	char c;
+	int i;
+
+	/* Basic format check. */
+	if (!((strlen(duid) == 16 && (dflags & OPENDEV_PART)) ||
+	    (strlen(duid) == 18 && duid[16] == '.')))
+		return 0;
+
+	/* Check UID. */
+	for (i = 0; i < 16; i++) {
+		c = duid[i];
+		if ((c < '0' || c > '9') && (c < 'a' || c > 'f'))
+			return 0;
+	}
+
+	return 1;
+}

src/lib/libutil/opendev.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: opendev.c,v 1.10 2010/06/28 19:12:29 chl Exp $	*/
+/*	$OpenBSD: opendev.c,v 1.11 2010/11/15 15:07:40 jsing Exp $	*/
 
 /*
  * Copyright (c) 2000, Todd C. Miller.  All rights reserved.
@@ -41,28 +41,6 @@
 
 #include "util.h"
 
-/* Returns 1 if a valid disklabel UID.  */
-static int
-valid_diskuid(const char *duid, int dflags)
-{
-	char c;
-	int i;
-
-	/* Basic format check. */
-	if (!((strlen(duid) == 16 && (dflags & OPENDEV_PART)) ||
-	    (strlen(duid) == 18 && duid[16] == '.')))
-		return 0;
-
-	/* Check UID. */
-	for (i = 0; i < 16; i++) {
-		c = duid[i];
-		if ((c < '0' || c > '9') && (c < 'a' || c > 'f'))
-			return 0;
-	}
-
-	return 1;
-}
-
 /*
  * This routine is a generic rewrite of the original code found in
  * disklabel(8).
@@ -88,7 +66,7 @@ opendev(char *path, int oflags, int dflags, char **realpath)
 
 	if ((slash = strchr(path, '/')))
 		fd = open(path, oflags);
-	else if (valid_diskuid(path, dflags)) {
+	else if (isduid(path, dflags)) {
 		if ((fd = open("/dev/diskmap", oflags)) != -1) {
 			bzero(&dm, sizeof(struct dk_diskmap));
 			strlcpy(namebuf, path, sizeof(namebuf));

src/lib/libutil/util.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: util.h,v 1.27 2006/06/14 02:14:25 krw Exp $	*/
+/*	$OpenBSD: util.h,v 1.28 2010/11/15 15:07:40 jsing Exp $	*/
 /*	$NetBSD: util.h,v 1.2 1996/05/16 07:00:22 thorpej Exp $	*/
 
 /*-
@@ -114,6 +114,7 @@ int	uu_lock_txfr(const char *_ttyname, pid_t _pid);
 int     uu_unlock(const char *_ttyname);
 int	fmt_scaled(long long number, char *result);
 int	scan_scaled(char *scaled, long long *result);
+int	isduid(const char *, int);
 __END_DECLS
 
 #endif /* !_UTIL_H_ */