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	free.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	free.c (1415B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/sysinfo.h>
	3
	4 #include <stdio.h>
	5 #include <stdlib.h>
	6
	7 #include "util.h"
	8
	9 static unsigned int mem_unit = 1;
	10 static unsigned int unit_shift;
	11
	12 static unsigned long long
	13 scale(unsigned long long v)
	14 {
	15 return (v * mem_unit) >> unit_shift;
	16 }
	17
	18 static void
	19 usage(void)
	20 {
	21 eprintf("usage: %s [-bkmg]\n", argv0);
	22 }
	23
	24 int
	25 main(int argc, char *argv[])
	26 {
	27 struct sysinfo info;
	28
	29 if (sysinfo(&info) < 0)
	30 eprintf("sysinfo:");
	31 mem_unit = info.mem_unit ? info.mem_unit : 1;
	32
	33 ARGBEGIN {
	34 case 'b':
	35 unit_shift = 0;
	36 break;
	37 case 'k':
	38 unit_shift = 10;
	39 break;
	40 case 'm':
	41 unit_shift = 20;
	42 break;
	43 case 'g':
	44 unit_shift = 30;
	45 break;
	46 default:
	47 usage();
	48 } ARGEND;
	49
	50 printf(" %13s%13s%13s%13s%13s\n",
	51 "total",
	52 "used",
	53 "free",
	54 "shared", "buffers");
	55 printf("Mem: ");
	56 printf("%13llu%13llu%13llu%13llu%13llu\n",
	57 scale(info.totalram),
	58 scale(info.totalram - info.freeram),
	59 scale(info.freeram),
	60 scale(info.sharedram),
	61 scale(info.bufferram));
	62 printf("-/+ buffers/cache:");
	63 printf("%13llu%13llu\n",
	64 scale(info.totalram - info.freeram - info.bufferram),
	65 scale(info.freeram + info.bufferram));
	66 printf("Swap:");
	67 printf("%13llu%13llu%13llu\n",
	68 scale(info.totalswap),
	69 scale(info.totalswap - info.freeswap),
	70 scale(info.freeswap));
	71 return 0;
	72 }