Page History

/* Verify argv[1] is supplied */

if (!verify_file(argv[1])) {
  /* Handle error */
}

if (fopen(argv[1], "w") == NULL) {
  /* Handle error */
}

/* ... */

char *realpath_res = NULL;

/* Verify argv[1] is supplied */

realpath_res = realpath(argv[1], NULL);
if (realpath_res == NULL) {
  /* Handle error */
}

if (!verify_file(realpath_res)) {
  /* Handle error */
}

if (fopen(realpath_res, "w") == NULL) {
  /* Handle error */
}

/* ... */

free(realpath_res);
realpath_res = NULL;

char *realpath_res = NULL;
char *canonical_file name = NULL;
size_t path_size = 0;

/* Verify argv[1] is supplied */

path_size = (size_t)PATH_MAX;

if (path_size > 0) {
  canonical_filename = malloc(path_size);

  if (canonical_filename == NULL) {
    /* Handle error */
  }

  realpath_res = realpath(argv[1], canonical_filename);
}

if (realpath_res == NULL) {
  /* Handle error */
}

if (!verify_file(realpath_res)) {
  /* Handle error */
}
if (fopen(realpath_res, "w") == NULL ) {
  /* Handle error */
}

/* ... */

free(canonical_filename);
canonical_filename = NULL;

char *realpath_res = NULL;
char *canonical_filename = NULL;
size_t path_size = 0;
long pc_result;

/* Verify argv[1] is supplied */

errno = 0;

/* Query for PATH_MAX */
pc_result = pathconf(argv[1], _PC_PATH_MAX);

if ( (pc_result == -1) && (errno != 0) ) {
  /* Handle error */
} else if (pc_result == -1) {
  /* Handle error */
} else if (pc_result <= 0) {
  /* Handle error */
}
path_size = (size_t)pc_result;

if (path_size > 0) {
  canonical_filename = malloc(path_size);

  if (canonical_filename == NULL) {
    /* Handle error */
  }

  realpath_res = realpath(argv[1], canonical_filename);
}

if (realpath_res == NULL) {
  /* Handle error */
}

if (!verify_file(realpath_res)) {
  /* Handle error */
}

if (fopen(realpath_res, "w") == NULL) {
  /* Handle error */
}

/* ... */

free(canonical_filename);
canonical_filename = NULL;

/* ... */

enum { INITBUFSIZE = 256 };
DWORD ret = 0;
DWORD new_ret = 0;
char *canonical_filename;
char *new_file;
char *file_name;

/* ... */

file_name = (char *)malloc(strlen(argv[1])+1);
canonical_filename = (char *)malloc(INITBUFSIZE);

if ( (file_name != NULL) && (canonical_filename != NULL) ) {
  strcpy(file_name, argv[1]);
  strcpy(canonical_filename, "");
} else {
  /* Handle error */
}

ret = GetFullPathName(
  file_name,
  INITBUFSIZE,
  canonical_filename,
  NULL
);

if (ret == 0) {
  /* Handle error */
}
else if (ret > INITBUFSIZE) {
  new_file = (char *)realloc(canonical_filename, ret);
  if (new_file == NULL) {
    /* Handle error */
  }

  canonical_filename = new_file;

  new_ret = GetFullPathName(
    file_name,
    ret,
    canonical_filename,
    NULL
  );
  if (new_ret > ret) {
    /*
     * The length of the path changed between calls
     * to GetFullPathName(); handle error.
     */
  }
  else if (new_ret == 0) {
    /* Handle error */
  }
}

if (!verify_file(canonical_filename)) {
  /* Handle error */
}
/* Verify file name before using */