/**
 * Cmon (c'mon) is a simple system resource monitor
 * Copyright (C) 2022  Aaron Ball <nullspoon@oper.io>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include "meminfo.h"

int meminfo_init(struct meminfo* m) {
  int status=0;

  FILE* fd = fopen("/proc/meminfo", "r");
  if (!fd)
    return 0;

  status += fscanf(fd, "MemTotal: %ld kB\n",     &m->total);
  status += fscanf(fd, "MemFree: %ld kB\n",      &m->free);
  status += fscanf(fd, "MemAvailable: %ld kB\n", &m->avail);
  status += fscanf(fd, "Buffers: %ld kB\n",      &m->buffers);
  status += fscanf(fd, "Cached: %ld kB\n",       &m->cached);
  // Custom value
  m->used = m->total - m->free - m->buffers - m->cached;
  fclose(fd);

  if(status > 5) {
    fprintf(stderr, "ERROR: Somehow read too many values from /proc/meminfo\n");
    return 0;
  }
  return 1;
}