filetest.c

This is simple sample program to test a File System integrity

#include <stdio.h>
#include <string.h>

#define FILENAME1 "./testfile1"
#define FILENAME2 "./testfile2"

int main(int argc, const char *argv[])
{

  FILE *f1, *f2;
  char buffer[100];
  char ch1, ch2;
  long f1_pos, f2_pos;
  char filename1[256];
  char filename2[256];

  strcpy(buffer,"abcdefghijklmnopqrstuvwxyz");

  // Command file parameters for path?
  if (argc == 2) {
    strcpy(filename1, argv[1]);
    strcpy(filename2, argv[1]);
    strcat(filename1, "/");
    strcat(filename2, "/");
    strcat(filename1, FILENAME1);
    strcat(filename2, FILENAME2);
  } else {
    strcpy(filename1, FILENAME1);
    strcpy(filename2, FILENAME2);
  }

  printf ("File 1 is %s\n", filename1);
  printf ("File 2 is %s\n", filename2);

  if (!(f1 = fopen(filename1, "w+"))) {
    perror ("Couldn't create file - 1.\n");
    exit(1);
  }

  if (!(f2 = fopen(filename2, "w+"))) {
    perror ("Couldn't create file - 2.\n");
    exit(1);
  }

  // Now write some data into the file
  if ( fwrite(buffer, 1, 26, f1) != 26) {
    perror ("Couldn't write into test file 1.\n");
    exit(1);
  }

  // Now copy the data into another file
  rewind(f1);
  while (fread(&ch1, 1, 1, f1)) {
    if (fwrite(&ch1, 1, 1, f2) != 1) {
      perror ("Couldn't copy file contents.\n");
      exit(1);
    }
  }


  // Now compare the 2 files to see if they match
  rewind(f1);
  rewind(f2);
  while ( (fread(&ch1, 1, 1, f1)) && (fread(&ch2, 1, 1, f2)) ) {
    if (ch1 != ch2) {
      perror ("File contents don't match.\n");
      exit(1);
    }
  }

  // Now check if we are at the end of BOTH the files
  f1_pos = ftell(f1);
  f2_pos = ftell(f2);

  if (f1_pos != f2_pos) {
    perror("File length of two files doesn't match.\n");
    exit(1);
  }

  fseek(f1, 0L, SEEK_END);
  fseek(f2, 0L, SEEK_END);

  if (f1_pos != ftell(f1)) {
    perror("File length of two files doesn't match.\n");
    exit(1);
  }

  if (f2_pos != ftell(f2)) {
    perror("File length of two files doesn't match.\n");
    exit(1);
  }

  fclose(f1);
  fclose(f2);

  // Test passed
  printf("File System test passed.\n");

}