such.c

// gencarol.c
// generate carol set
//

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#include <time.h>

void makedir(const char *path) {
  int ret = mkdir(path, 0755);
  if (ret != 0 && errno != EEXIST) {
    perror("Failed to create destination folder:");
    exit(1);
  }
}

void file_with_random_content(const char *path) {
  int length = 1000 + rand() % 1000;
  FILE *fp = fopen(path, "w");
  char chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

  if (!fp) {
    perror("Failed to create output file:");
    exit(1);
  }

  while(length --) {
    fputc(chars[rand() % 62], fp);
  }

  fclose(fp);
}

void three_deep (const char *base_path) {
  int i, j, k;
  for (i = 0 ; i < 10 ; i ++) {
    char ipath[1024];
    sprintf(ipath, "%s/%d", base_path, i);
    makedir(ipath);

    printf(":: i = %d\n", i);

    for (j = 0 ; j < 10 ; j ++) {
      char jpath[1024];
      sprintf(jpath, "%s/%d/%d", base_path, i, j);
      makedir(jpath);

      for (k = 0 ; k < 100 ; k ++) {
        char kpath[1024];
        sprintf(kpath, "%s/%d/%d/%02d.txt", base_path, i, j, k);
        file_with_random_content(kpath);
      }
    }
  }
}

void two_deep (const char *base_path) {
  int i, j, k;
  for (i = 0 ; i < 10 ; i ++) {
    char ipath[1024];
    sprintf(ipath, "%s/%d", base_path, i);
    makedir(ipath);

    printf(":: i = %d\n", i);
    for (k = 0 ; k < 1000 ; k ++) {
      char kpath[1024];
      sprintf(kpath, "%s/%d/%03d.txt", base_path, i, k);
      file_with_random_content(kpath);
    }
  }
}

int main() {
  const char *base_path = "/Users/verma/tmp/ccset2";

  srand(time(NULL));

  two_deep(base_path);

  return 0;
}