commit fb0aebf941512d784753f8982cb1bf712980c0c1
Author: Steven Dee <steve@smartercode.net>
Date:   Mon Jul 22 10:52:19 2013 -0400

    Add df

diff --git a/Makefile b/Makefile
index da4d0d0..511b89b 100644
--- a/Makefile
+++ b/Makefile
@@ -37,6 +37,7 @@ SRC = \
 	comm.c     \
 	cp.c       \
 	date.c     \
+	df.c       \
 	dirname.c  \
 	echo.c     \
 	env.c      \
diff --git a/df.c b/df.c
new file mode 100644
index 0000000..4525aaa
--- /dev/null
+++ b/df.c
@@ -0,0 +1,43 @@
+#include <sys/param.h>
+#include <sys/mount.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "util.h"
+
+static void mnt_show(struct statfs *s);
+
+int
+main(void)
+{
+	struct statfs *mntbuf;
+	int len, i;
+
+	len = getmntinfo(&mntbuf, MNT_WAIT);
+	if(len == 0) {
+		eprintf("getmntinfo:");
+	}
+
+	printf("Filesystem  512-blocks      Used     Avail Capacity  Mounted on\n");
+	for (i = 0; i < len; i++) {
+		mnt_show(&mntbuf[i]);
+	}
+	return 0;
+}
+
+static void
+mnt_show(struct statfs *s)
+{
+	u_int64_t total, used, avail;
+	int capacity;
+	int bs;
+
+	bs = s->f_bsize / 512;
+
+	total = s->f_blocks * bs;
+	avail = s->f_bfree * bs;
+	used = total - avail;
+	capacity = (used * 100) / total;
+
+	printf("%-12s %9llu %9llu %9llu %5d%%    %s\n",
+	       s->f_mntfromname, total, used, avail, capacity, s->f_mntonname);
+}
diff --git a/util.h b/util.h
index 620390a..035b061 100644
--- a/util.h
+++ b/util.h
@@ -4,6 +4,8 @@
 
 #define UTF8_POINT(c) (((c) & 0xc0) != 0x80)
 
+#undef MIN
+#undef MAX
 #define MIN(x,y)  ((x) < (y) ? (x) : (y))
 #define MAX(x,y)  ((x) > (y) ? (x) : (y))