[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
_AT_@ -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
_AT_@ -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
--bg08WKrSYDhXBjb5--