Change sprintf to snprintf calls.

#if defined(__APPLE__)

  // cmd is guaranteed to always be big enough to hold this string.

  sprintf(cmd, "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid_);

  snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid_);

  FILE* fp = popen(cmd, "r");

#else

  // path is guaranteed to always be big enough to hold this string.

  sprintf(path, "/proc/%d/maps", pid_);

  snprintf(path, sizeof(path), "/proc/%d/maps", pid_);

  FILE* fp = fopen(path, "r");

#endif

  if (fp == NULL) {