Hi all,
This is an initial bare bones df(1) implementation.
I'm looking for some feedback, I have not put too much thought
into the code yet (too busy atm).
No manpage yet.
Thanks,
sin
>From a82f46681f68edafec898cd82b2ca64941440c11 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 | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 121 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..86c58f3
--- /dev/null
+++ b/df.c
@@ -0,0 +1,120 @@
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <mntent.h>
+#include "util.h"
+
+struct mnt_entry {
+ char *fsname;
+ char *dir;
+ char *type;
+ struct stat stat;
+ struct statvfs statvfs;
+};
+
+struct mnt_tbl {
+ struct mnt_entry *entry;
+ size_t siz;
+};
+
+static void mnt_show(struct mnt_entry *entry);
+
+enum {
+ BLKSIZ = 1024
+};
+
+struct mnt_tbl *
+init_mnt_tbl(void)
+{
+ struct mnt_tbl *mnt_tbl;
+ struct mnt_entry *entry;
+ FILE *fp;
+ struct mntent *me;
+ size_t siz = 0;
+
+ fp = setmntent("/proc/mounts", "r");
+ if (!fp)
+ eprintf("fopen /proc/mounts:");
+
+ mnt_tbl = malloc(sizeof(*mnt_tbl));
+ if (!mnt_tbl)
+ eprintf("malloc:");
+ mnt_tbl->entry = NULL;
+ mnt_tbl->siz = 0;
+
+ while ((me = getmntent(fp))) {
+ mnt_tbl->entry = realloc(mnt_tbl->entry,
+ sizeof(*entry) * (siz + 1));
+ if (!mnt_tbl->entry)
+ eprintf("realloc");
+ entry = &mnt_tbl->entry[siz];
+ entry->fsname = strdup(me->mnt_fsname);
+ entry->dir = strdup(me->mnt_dir);
+ entry->type = strdup(me->mnt_type);
+ stat(me->mnt_dir, &entry->stat);
+ statvfs(me->mnt_dir, &entry->statvfs);
+ siz++;
+ }
+ mnt_tbl->siz = siz;
+
+ endmntent(fp);
+ return mnt_tbl;
+}
+
+int
+main(void)
+{
+ struct mnt_entry *entry;
+ struct mnt_tbl *mnt_tbl;
+ size_t i;
+
+ mnt_tbl = init_mnt_tbl();
+ printf("%-20s %-14s %s %s %s %s\n", "Filesystem", "1K-blocks",
+ "Used", "Available", "Use%", "Mounted on");
+ for (i = 0; i < mnt_tbl->siz; i++) {
+ entry = &mnt_tbl->entry[i];
+ if (!entry->stat.st_dev)
+ continue;
+ mnt_show(entry);
+ }
+ return 0;
+}
+
+static void
+mnt_show(struct mnt_entry *entry)
+{
+ long long size, used, avail;
+ long long percent = 0, fsbsize;
+
+ if (!entry->statvfs.f_blocks)
+ return;
+
+ if (entry->statvfs.f_bsize)
+ fsbsize = entry->statvfs.f_bsize;
+ else
+ fsbsize = 1;
+
+ size = (fsbsize * entry->statvfs.f_blocks) / BLKSIZ;
+ used = (fsbsize * (entry->statvfs.f_blocks - entry->statvfs.f_bfree));
+ used /= BLKSIZ;
+ avail = fsbsize;
+ if (getuid())
+ avail *= entry->statvfs.f_bavail;
+ else
+ avail *= entry->statvfs.f_bfree;
+ avail /= BLKSIZ;
+
+ if (used + avail) {
+ percent = (used * 100) / (used + avail);
+ if (used * 100 != percent * (used + avail))
+ percent++;
+ }
+
+ printf("%-20s %9lld ", entry->fsname, size);
+ printf("%9lld ", used);
+ printf("%9lld %3lld%% %s\n",
+ avail, percent, entry->dir);
+}
--
1.8.3.3
