/*
* Copyright (c) 2012-2013 Spotify AB
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
#include <stdio.h>
#include <string.h>

#include "util.h"
#include "sparkey.h"

#include <stdlib.h>
#include <errno.h>

sparkey_returncode sparkey_open_returncode(int e) {
  switch (e) {
  case EPERM:
  case EACCES: return SPARKEY_PERMISSION_DENIED;
  case ENFILE: return SPARKEY_TOO_MANY_OPEN_FILES;
  case ENOENT: return SPARKEY_FILE_NOT_FOUND;
  case EOVERFLOW: return SPARKEY_FILE_TOO_LARGE;
  default:
    fprintf(stderr, "_sparkey_open_returncode():%d error: errno = %d\n", __LINE__, e);
    return SPARKEY_INTERNAL_ERROR;
  }
}

sparkey_returncode sparkey_create_returncode(int e) {
  switch (e) {
  case EPERM:
  case EROFS:
  case EACCES: return SPARKEY_PERMISSION_DENIED;
  case EEXIST: return SPARKEY_FILE_ALREADY_EXISTS;
  case EISDIR: return SPARKEY_FILE_IS_DIRECTORY;
  case ENFILE:
  case EMFILE: return SPARKEY_TOO_MANY_OPEN_FILES;
  default:
    fprintf(stderr, "_sparkey_create_returncode():%d error: errno = %d\n", __LINE__, e);
    return SPARKEY_INTERNAL_ERROR;
  }
}

sparkey_returncode sparkey_remove_returncode(int e) {
  switch (e) {
  case EPERM:
  case EROFS:
  case EACCES: return SPARKEY_PERMISSION_DENIED;
  case EBUSY: return SPARKEY_FILE_BUSY; // Can't happen on linux
  case EISDIR: return SPARKEY_FILE_IS_DIRECTORY;
  case EOVERFLOW: return SPARKEY_FILE_TOO_LARGE;
  default:
    fprintf(stderr, "_sparkey_remove_returncode():%d error: errno = %d\n", __LINE__, e);
    return SPARKEY_INTERNAL_ERROR;
  }
}

static inline char * _create_filename(const char *input, const char *from, char to) {
  if (input == NULL) return NULL;
  size_t l = strlen(input);

  // Paranoia - avoid ridiculously long filenames.
  if (l > 10000) return NULL;

  // Too short to contain from
  if (l < strlen(from)) return NULL;

  if (memcmp(&input[l - strlen(from)], from, strlen(from))) return NULL;

  char *output = strdup(input);
  if (output == NULL) return NULL;

  output[l - 1] = to;
  return output;
}

char * sparkey_create_log_filename(const char *index_filename) {
  return _create_filename(index_filename, ".spi", 'l');
}

char * sparkey_create_index_filename(const char *log_filename) {
  return _create_filename(log_filename, ".spl", 'i');
}