misc.cpp

#include "misc.hpp"

// reverse&complement a 0123-encoded string
void rc3(char *s, int l) {
  int i;
  for (i = 0; i < (l >> 1); ++i) {
    int tmp = s[l - 1 - i];
    s[l - 1 - i] = 4 - s[i];
    s[i] = 4 - tmp;
  }
  if (l & 1)
    s[i] = 4 - s[i];
}

// reverse&complement a 1234-encoded string
void rc4(char *s, int l) {
  int i;
  for (i = 0; i < (l >> 1); ++i) {
    int tmp = s[l - 1 - i];
    s[l - 1 - i] = 5 - s[i];
    s[i] = 5 - tmp;
  }
  if (l & 1)
    s[i] = 5 - s[i];
}

double realtime() {
  struct timeval tp;
  struct timezone tzp;
  gettimeofday(&tp, &tzp);
  return (double)tp.tv_sec + (double)tp.tv_usec * 1e-6;
}

long long current_rss_kb() {
  std::ifstream f("/proc/self/status");
  std::string line;

  while (std::getline(f, line)) {
    if (line.rfind("VmRSS:", 0) == 0) { // starts with "VmRSS:"
      auto pos = line.find_first_of("0123456789");
      return std::stoll(line.substr(pos)) / 1024 / 1024;
    }
  }
  return -1;
}