[dev] [sbase] [patch v3] Add df(1)

[sin]

Clean up the code a bit.  Behave like -a by default.

>From 01cbe6a93df9d71e0fe184405895763d4498ac7f Mon Sep 17 00:00:00 2001
From: sin <s...@2f30.org>
Date: Mon, 22 Jul 2013 13:17:32 +0100
Subject: [PATCH] Add df(1)

---
 Makefile |  1 +
 df.c     | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 df.c

diff --git a/Makefile b/Makefile
index 2e31f33..bb981ce 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,7 @@ 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..2b4cebf
--- /dev/null
+++ b/df.c
@@ -0,0 +1,53 @@
+#include <sys/statvfs.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <mntent.h>
+#include "util.h"
+
+static void mnt_show(const char *fsname, const char *dir,
+                    const char *type);
+
+int
+main(void)
+{
+       FILE *fp;
+       struct mntent *me;
+
+       fp = setmntent("/proc/mounts", "r");
+       if (!fp)
+               eprintf("fopen /proc/mounts:");
+
+       printf("Filesystem  512-blocks      Used     Avail Capacity  Mounted 
on\n");
+       while ((me = getmntent(fp)))
+               mnt_show(me->mnt_fsname, me->mnt_dir,
+                        me->mnt_type);
+       endmntent(fp);
+       return 0;
+}
+
+static void
+mnt_show(const char *fsname, const char *dir,
+        const char *type)
+{
+       struct statvfs s;
+       unsigned long long total, used, avail;
+       int capacity = 0;
+       int bs;
+
+       statvfs(dir, &s);
+
+       bs = s.f_bsize ? s.f_bsize : 1;
+       total = s.f_blocks * bs / 512;
+       avail = s.f_bfree * bs / 512;
+       used = total - avail;
+
+       if (used + avail) {
+               capacity = (used * 100) / (used + avail);
+               if (used * 100 != capacity * (used + avail))
+                       capacity++;
+       }
+
+       printf("%-12s %9llu %9llu %9llu %7d%%  %s\n",
+              fsname, total, used, avail, capacity,
+              dir);
+}
-- 
1.8.3.3