Add getbsize() function

Import code from DragonFlyBSD and man page from FreeBSD.

3 files changed, 105 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index c9a4df0..6efddf5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -52,6 +52,7 @@ libbsd_la_SOURCES = \
 	fparseln.c \
 	fpurge.c \
 	funopen.c \
+	getbsize.c \
 	getpeereid.c \
 	hash/md5.c \
 	hash/md5hl.c \
diff --git a/src/getbsize.c b/src/getbsize.c
new file mode 100644
index 0000000..3e3ff49
--- /dev/null
+++ b/src/getbsize.c
@@ -0,0 +1,102 @@
+/*-
+ * Copyright (c) 1991, 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.
+ *
+ * @(#)getbsize.c	8.1 (Berkeley) 6/4/93
+ * $FreeBSD: src/lib/libc/gen/getbsize.c,v 1.9 2008/08/04 06:53:13 cperciva Exp $
+ * $DragonFly: src/lib/libc/gen/getbsize.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *
+getbsize(int *headerlenp, long *blocksizep)
+{
+	static char header[20];
+	long n, max, mul, blocksize;
+	char *ep, *p;
+	const char *form;
+
+#define	KB	(1024L)
+#define	MB	(1024L * 1024L)
+#define	GB	(1024L * 1024L * 1024L)
+#define	MAXB	GB		/* No tera, peta, nor exa. */
+	form = "";
+	if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
+		if ((n = strtol(p, &ep, 10)) < 0)
+			goto underflow;
+		if (n == 0)
+			n = 1;
+		if (*ep && ep[1])
+			goto fmterr;
+		switch (*ep) {
+		case 'G': case 'g':
+			form = "G";
+			max = MAXB / GB;
+			mul = GB;
+			break;
+		case 'K': case 'k':
+			form = "K";
+			max = MAXB / KB;
+			mul = KB;
+			break;
+		case 'M': case 'm':
+			form = "M";
+			max = MAXB / MB;
+			mul = MB;
+			break;
+		case '\0':
+			max = MAXB;
+			mul = 1;
+			break;
+		default:
+fmterr:			warnx("%s: unknown blocksize", p);
+			n = 512;
+			max = MAXB;
+			mul = 1;
+			break;
+		}
+		if (n > max) {
+			warnx("maximum blocksize is %ldG", MAXB / GB);
+			n = max;
+		}
+		if ((blocksize = n * mul) < 512) {
+underflow:		warnx("minimum blocksize is 512");
+			form = "";
+			blocksize = n = 512;
+		}
+	} else
+		blocksize = n = 512;
+
+	snprintf(header, sizeof(header), "%ld%s-blocks", n, form);
+	*headerlenp = strlen(header);
+	*blocksizep = blocksize;
+	return (header);
+}
diff --git a/src/libbsd.map b/src/libbsd.map
index 4d483df..c0286a3 100644
--- a/src/libbsd.map
+++ b/src/libbsd.map
@@ -112,6 +112,8 @@ LIBBSD_0.6 {
 } LIBBSD_0.5;
 
 LIBBSD_0.7 {
+    getbsize;
+
     funopen;
 
     _time32_to_time;