1   │ #include <stdio.h>
   2   │ #include <dirent.h>
   3   │ #include <sys/types.h>
   4   │ #include <sys/stat.h>
   5   │ #include <fcntl.h>
   6   │ #include <stdlib.h>
   7   │ #include <limits.h>
   8   │ #include <ctype.h>
   9   │ #include <unistd.h>
  10   │
  11   │ int main(int argc, char* argv[]) {
  12   │     DIR *d = opendir(argv[1]);
  13   │     struct dirent* dd;
  14   │
  15   │     int64_t sum = 0;
  16   │
  17   │     while ((dd = readdir(d))) {
  18   │         char buf[PATH_MAX];
  19   │         if (snprintf(buf, sizeof(buf), "%s/%s", argv[1], dd->d_name) < sizeof(buf)) {
  20   │             struct stat stb;
  21   │             if (stat(buf, &stb) >= 0 && S_ISREG(stb.st_mode) &&
  22   │                 isupper((unsigned char)dd->d_name[0]) &&
  23   │                 stb.st_uid == getuid())
  24   │             {
  25   │                 sum += stb.st_size;
  26   │             }
  27   │         }
  28   │     }
  29   │     printf("%lld\n", sum);
  30   │
  31   │     closedir(d);
  32   │ }