#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);
    }
}