From 596b0d2edd22ebebefe3315e2b864246b5df55b8 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Tue, 28 Feb 2023 14:49:34 -0500
Subject: very rought outline of what needs to be done

---
 df.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 df.c

diff --git a/df.c b/df.c
new file mode 100644
index 0000000..f44ee74
--- /dev/null
+++ b/df.c
@@ -0,0 +1,93 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2023, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/statvfs.h>
+#include <unistd.h>
+
+static enum { POSIX, TOTAL } output = POSIX;
+static unsigned int blocksize = 512;
+
+static int df(const char *path)
+{
+	struct statvfs fs;
+	if (statvfs(path, &fs) != 0) {
+		perror(path);
+		return 1;
+	}
+
+	const char *name = path;
+	const char *root = path;
+	printf("%-10s %11ju %11ju %11ju %7ju%% %s\n",
+		name,
+		fs.f_blocks,
+		fs.f_blocks - fs.f_bfree,
+		fs.f_bfree,
+		((fs.f_blocks - fs.f_bfree) * 100 / fs.f_blocks),
+		root);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+
+
+	int c;
+	while ((c = getopt(argc, argv, "kPt")) != -1) {
+		switch(c) {
+		case 'k':	/** Use 1024-byte blocks **/
+			blocksize = 1024;
+			break;
+
+		case 'P':
+			output = POSIX;
+			break;
+
+		case 't':
+			output = TOTAL;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (output == POSIX) {
+		printf("Filesystem %4u-blocks        Used   Available Capacity Mounted on\n", blocksize);
+	} else {
+		/* print some other header */
+	}
+
+	int ret = 0;
+	do {
+		ret |= df(argv[optind++]);
+	} while (optind < argc);
+	return ret;
+}
-- 
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