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print_cpu_usage.c

// vim:sw=8:sts=8:ts=8:expandtab
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>

#include "i3status.h"

static int prev_total = 0;
static int prev_idle  = 0;

/*
 * Reads the CPU utilization from /proc/stat and returns the usage as a
 * percentage.
 *
 */
void print_cpu_usage(const char *format) {
        const char *walk;
        char buf[1024];
        int curr_user, curr_nice, curr_system, curr_idle, curr_total;
        int diff_idle, diff_total, diff_usage;

#if defined(LINUX)
        static char statpath[512];
        strcpy(statpath, "/proc/stat");
        if (!slurp(statpath, buf, sizeof(buf)))
                die("could not read %s\n", statpath);

        if (sscanf(buf, "cpu %d %d %d %d", &curr_user, &curr_nice, &curr_system, &curr_idle) != 4)
                die("could not read cpu utilization\n");

        curr_total = curr_user + curr_nice + curr_system + curr_idle;
        diff_idle  = curr_idle - prev_idle;
        diff_total = curr_total - prev_total;
        diff_usage = (1000 * (diff_total - diff_idle)/diff_total + 5)/10;
        prev_total = curr_total;
        prev_idle  = curr_idle;
#endif
        for (walk = format; *walk != '\0'; walk++) {
                if (*walk != '%') {
                        putchar(*walk);
                        continue;
                }

                if (strncmp(walk+1, "usage", strlen("usage")) == 0) {
                        printf("%02d%%", diff_usage);
                        walk += strlen("usage");
                }
        }
}

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