From 872cf03f26c2801ae6c3008ce5fa0d7856f5f85d Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Sun, 14 Dec 2025 18:10:13 +0100
Subject: libc: implement err/warn functions

---
 bin/free/free.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 bin/free/free.c

(limited to 'bin/free/free.c')

diff --git a/bin/free/free.c b/bin/free/free.c
new file mode 100644
index 00000000..b42ad99a
--- /dev/null
+++ b/bin/free/free.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <sys/sysinfo.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+	int opt;
+	struct sysinfo info;
+	unsigned int shift;
+
+	while ((opt = getopt(argc, argv, "hmtbs")) != -1) {
+		switch (opt) {
+		case 'b': /* bytes */
+			shift = 0;
+			break;
+		case 'k': /* kibibytes */
+			shift = 10;
+			break;
+		case 'm': /* mebibytes */
+			shift = 20;
+			break;
+		case 'g': /* gibibytes */
+			shift = 30;
+			break;
+		default:
+			goto usage;
+		}
+	}
+
+	if (sysinfo(&info) < 0)
+		perror("sysinfo");
+
+	printf("     %13s%13s%13s%13s%13s\n", "total", "used", "free", "shared",
+	       "buffers");
+
+	printf("Mem: %13llu%13llu%13llu%13llu%13llu\n",
+	       (unsigned long long)((info.totalram * info.mem_unit) >> shift),
+	       (unsigned long long)(((info.totalram - info.freeram) *
+				     info.mem_unit) >>
+				    shift),
+	       (unsigned long long)((info.freeram * info.mem_unit) >> shift),
+	       (unsigned long long)((info.sharedram * info.mem_unit) >> shift),
+	       (unsigned long long)((info.bufferram * info.mem_unit) >> shift));
+
+	printf("-/+ buffers/cache:%13llu%13llu\n",
+	       (unsigned long long)(((info.totalram - info.freeram -
+				      info.bufferram) *
+				     info.mem_unit) >>
+				    shift),
+	       (unsigned long long)(((info.freeram + info.bufferram) *
+				     info.mem_unit) >>
+				    shift));
+	printf("Swap:%13llu%13llu%13llu\n",
+	       (unsigned long long)((info.totalswap * info.mem_unit) >> shift),
+	       (unsigned long long)(((info.totalswap - info.freeswap) *
+				     info.mem_unit) >>
+				    shift),
+	       (unsigned long long)((info.freeswap * info.mem_unit) >> shift));
+
+	return 0;
+usage:
+	write(STDOUT_FILENO, "usage: free [-hmtbs]\n", 21);
+	return 0;
+}
-- 
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