//

// path-join.c

//

// Copyright (c) 2013 Stephen Mathieson

// MIT licensed

//

#include <string.h>

#include <stdlib.h>

#include "strdup/strdup.h"

#include "str-ends-with/str-ends-with.h"

#include "str-starts-with/str-starts-with.h"

#include "path-join.h"

#ifdef _WIN32

#define PATH_JOIN_SEPERATOR   "\\"

#else

#define PATH_JOIN_SEPERATOR   "/"

#endif

/*

 * Join `dir` with `file`

 */

char *

path_join(const char *dir, const char *file) {

  int size = strlen(dir) + strlen(file) + 2;

  char *buf = malloc(size * sizeof(char));

  if (NULL == buf) return NULL;

  strcpy(buf, dir);

  // add the sep if necessary

  if (!str_ends_with(dir, PATH_JOIN_SEPERATOR)) {

    strcat(buf, PATH_JOIN_SEPERATOR);

  }

  // remove the sep if necessary

  if (str_starts_with(file, PATH_JOIN_SEPERATOR)) {

    char *filecopy = strdup(file);

    if (NULL == filecopy) {

      free(buf);

      return NULL;

    }

    strcat(buf, ++filecopy);

    free(--filecopy);

  } else {

    strcat(buf, file);

  }

  return buf;

}