#define _DEFAULT_SOURCE

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include "config.h"

int

main(void)

{

    while (1) {

        char line[513];

        FILE *fd;

        fd = fopen("/proc/meminfo", "r");

        if (fd == NULL) {

            perror("fopen");

            exit(1);

        }

        int free = 0;

        int total = 0;

        int sub;

        while (!feof(fd)) {

            if (fgets(line, sizeof(line)-1, fd) == NULL)

                break;

            if (!strncmp(line, "MemTotal", 8))

                sscanf(line+9, "%*[ ]%d%*[^\n]", &total);

            if (!strncmp(line, "MemFree", 7))

                sscanf(line+8, "%*[ ]%d%*[^\n]", &free);

            if (!strncmp(line, "Buffers", 7)) {

                sscanf(line+8, "%*[ ]%d%*[^\n]", &sub);

                free += sub;

            }

            if (!strncmp(line, "Cached", 6)) {

                sscanf(line+7, "%*[ ]%d%*[^\n]", &sub);

                free += sub;

            }

        }

        fclose(fd);

        int used = total - free;

        char *color;

        if (used*1.0/total < GREEN) color = "color='green'";

        else if (used*1.0/total > RED) color = "color='red'";

        else if (used*1.0/total > ORANGE) color = "color='orange'";

        else color = "";

        printf("<span %s>%d/%d</span>\n", color, used/1024, total/1024);

        fflush(stdout);

	sleep(UPDATE_PERIOD);

    }

}