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+/* vi: set sw=4 ts=4:
+ *
+ * free.c - Display amount of free and used memory in the system.
+ *
+ * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
+ *
+ * Not in SUSv3.
+
+USE_FREE(NEWTOY(free, "gmkb", TOYFLAG_USR|TOYFLAG_BIN))
+
+config FREE
+ bool "free"
+ default y
+ help
+ usage: free [-bkmg]
+
+ Display the total, free and used amount of physical memory and
+ swap space.
+ -bkmg Output in bytes (default), KB, MB or GB
+*/
+
+#include "toys.h"
+#include <sys/sysinfo.h>
+
+
+static unsigned long long convert(unsigned long d, unsigned int iscale,
+ unsigned int oscale)
+{
+ return ((unsigned long long)d*iscale)>>oscale;
+}
+
+void free_main(void)
+{
+ struct sysinfo info;
+ unsigned int iscale = 1;
+ unsigned int oscale = 0;
+
+ sysinfo(&info);
+ if (info.mem_unit) iscale = info.mem_unit;
+ if (toys.optflags & 1) oscale = 0;
+ if (toys.optflags & 2) oscale = 10;
+ if (toys.optflags & 4) oscale = 20;
+ if (toys.optflags & 8) oscale = 30;
+
+ printf(" total used free shared buffers\n");
+ printf("Mem: %12llu%12llu%12llu%12llu%12llu\n",
+ convert(info.totalram, iscale, oscale),
+ convert(info.totalram-info.freeram, iscale, oscale),
+ convert(info.freeram, iscale, oscale),
+ convert(info.sharedram, iscale, oscale),
+ convert(info.bufferram, iscale, oscale));
+
+ printf("-/+ buffers/cache: %12llu%12llu\n",
+ convert(info.totalram - info.freeram - info.bufferram, iscale, oscale),
+ convert(info.freeram + info.bufferram, iscale, oscale));
+
+ printf("Swap: %12llu%12llu%12llu\n",
+ convert(info.totalswap, iscale, oscale),
+ convert(info.totalswap - info.freeswap, iscale, oscale),
+ convert(info.freeswap, iscale, oscale));
+}