98 lines
1.7 KiB
C
98 lines
1.7 KiB
C
/**
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* @brief free - Show free / used / total RAM
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2015-2018 K. Lange
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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void show_usage(int argc, char * argv[]) {
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printf(
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"free - show available memory\n"
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"\n"
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"usage: %s [-utk?]\n"
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"\n"
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" -u \033[3mshow used instead of free\033[0m\n"
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" -t \033[3minclude a total\033[0m\n"
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" -k \033[3muse kilobytes instead of megabytes\033[0m\n"
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" -? \033[3mshow this help text\033[0m\n"
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"\n", argv[0]);
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}
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int main(int argc, char * argv[]) {
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int show_used = 0;
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int use_kilobytes = 0;
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int show_total = 0;
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int c;
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while ((c = getopt(argc, argv, "utk?")) != -1) {
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switch (c) {
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case 'u':
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show_used = 1;
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break;
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case 't':
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show_total = 1;
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break;
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case 'k':
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use_kilobytes = 1;
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break;
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case '?':
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show_usage(argc, argv);
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return 0;
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}
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}
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const char * unit = "kB";
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FILE * f = fopen("/proc/meminfo", "r");
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if (!f) return 1;
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int total, free, used;
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char buf[1024] = {0};
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fgets(buf, 1024, f);
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char * a, * b;
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a = strchr(buf, ' ');
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a++;
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b = strchr(a, '\n');
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*b = '\0';
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total = atoi(a);
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fgets(buf, 1024, f);
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a = strchr(buf, ' ');
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a++;
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b = strchr(a, '\n');
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*b = '\0';
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free = atoi(a);
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//fscanf(f, "MemTotal: %d kB\nMemFree: %d kB\n", &total, &free);
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used = total - free;
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if (!use_kilobytes) {
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unit = "MB";
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free /= 1024;
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used /= 1024;
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total /= 1024;
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}
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if (show_used) {
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printf("%d %s", used, unit);
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} else {
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printf("%d %s", free, unit);
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}
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if (show_total) {
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printf(" / %d %s", total, unit);
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}
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printf("\n");
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return 0;
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}
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