path: root/src/contrib/tinydir-1.2.4/tinydir.h

/*
Copyright (c) 2013-2021, tinydir authors:
- Cong Xu
- Lautis Sun
- Baudouin Feildel
- Andargor <andargor@yahoo.com>
All rights reserved.

Redistribution and use in source and binary forms, with or without
                                                               modification, are
permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
                                                                              2.
Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.

           THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
            */
#ifndef TINYDIR_H
#define TINYDIR_H

#ifdef __cplusplus
extern "C" {
#endif

#if ((defined _UNICODE) && !(defined UNICODE))
#define UNICODE
#endif

#if ((defined UNICODE) && !(defined _UNICODE))
#define _UNICODE
#endif

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <tchar.h>
#include <windows.h>
#pragma warning(push)
#pragma warning(disable : 4996)
#else
#include <dirent.h>
#include <libgen.h>
#include <stddef.h>
#include <sys/stat.h>
#endif
#ifdef __MINGW32__
#include <tchar.h>
#endif

/* types */

/* Windows UNICODE wide character support */
#if defined _MSC_VER || defined __MINGW32__
#define _tinydir_char_t   TCHAR
#define TINYDIR_STRING(s) _TEXT(s)
#define _tinydir_strlen   _tcslen
#define _tinydir_strcpy   _tcscpy
#define _tinydir_strcat   _tcscat
#define _tinydir_strcmp   _tcscmp
#define _tinydir_strrchr  _tcsrchr
#define _tinydir_strncmp  _tcsncmp
#else
#define _tinydir_char_t   char
#define TINYDIR_STRING(s) s
#define _tinydir_strlen   strlen
#define _tinydir_strcpy   strcpy
#define _tinydir_strcat   strcat
#define _tinydir_strcmp   strcmp
#define _tinydir_strrchr  strrchr
#define _tinydir_strncmp  strncmp
#endif

#if (defined _MSC_VER || defined __MINGW32__)
#include <windows.h>
#define _TINYDIR_PATH_MAX MAX_PATH
#elif defined __linux__
#include <limits.h>
#ifdef PATH_MAX
#define _TINYDIR_PATH_MAX PATH_MAX
#endif
#elif defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
#include <sys/param.h>
#if defined(BSD)
#include <limits.h>
#ifdef PATH_MAX
#define _TINYDIR_PATH_MAX PATH_MAX
#endif
#endif
#endif

#ifndef _TINYDIR_PATH_MAX
#define _TINYDIR_PATH_MAX 4096
#endif

#ifdef _MSC_VER
/* extra chars for the "\\*" mask */
#define _TINYDIR_PATH_EXTRA 2
#else
#define _TINYDIR_PATH_EXTRA 0
#endif

#define _TINYDIR_FILENAME_MAX 256

#if (defined _MSC_VER || defined __MINGW32__)
#define _TINYDIR_DRIVE_MAX 3
#endif

#ifdef _MSC_VER
#define _TINYDIR_FUNC static __inline
#elif !defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L
#define _TINYDIR_FUNC static __inline__
#elif defined(__cplusplus)
#define _TINYDIR_FUNC static inline
#elif defined(__GNUC__)
/* Suppress unused function warning */
#define _TINYDIR_FUNC __attribute__((unused)) static
#else
#define _TINYDIR_FUNC static
#endif

#if defined(i386) || defined(__i386__) || defined(__i386) || defined(_M_IX86)
#ifdef _MSC_VER
#define _TINYDIR_CDECL __cdecl
#else
#define _TINYDIR_CDECL __attribute__((cdecl))
#endif
#else
#define _TINYDIR_CDECL
#endif

/* readdir_r usage; define TINYDIR_USE_READDIR_R to use it (if supported) */
#ifdef TINYDIR_USE_READDIR_R

/* readdir_r is a POSIX-only function, and may not be available under various
 * environments/settings, e.g. MinGW. Use readdir fallback */
#if _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _BSD_SOURCE || _SVID_SOURCE || \
    _POSIX_SOURCE
#define _TINYDIR_HAS_READDIR_R
#endif
#if _POSIX_C_SOURCE >= 200112L
#define _TINYDIR_HAS_FPATHCONF
#include <unistd.h>
#endif
#if _BSD_SOURCE || _SVID_SOURCE || \
    (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
#define _TINYDIR_HAS_DIRFD
#include <sys/types.h>
#endif
#if defined _TINYDIR_HAS_FPATHCONF && defined _TINYDIR_HAS_DIRFD && \
    defined _PC_NAME_MAX
#define _TINYDIR_USE_FPATHCONF
#endif
#if defined __MINGW32__ || !defined _TINYDIR_HAS_READDIR_R || \
    !(defined _TINYDIR_USE_FPATHCONF || defined NAME_MAX)
#define _TINYDIR_USE_READDIR
#endif

/* Use readdir by default */
#else
#define _TINYDIR_USE_READDIR
#endif

/* MINGW32 has two versions of dirent, ASCII and UNICODE*/
#ifndef _MSC_VER
#if (defined __MINGW32__) && (defined _UNICODE)
#define _TINYDIR_DIR      _WDIR
#define _tinydir_dirent   _wdirent
#define _tinydir_opendir  _wopendir
#define _tinydir_readdir  _wreaddir
#define _tinydir_closedir _wclosedir
#else
#define _TINYDIR_DIR      DIR
#define _tinydir_dirent   dirent
#define _tinydir_opendir  opendir
#define _tinydir_readdir  readdir
#define _tinydir_closedir closedir
#endif
#endif

/* Allow user to use a custom allocator by defining _TINYDIR_MALLOC and
 * _TINYDIR_FREE. */
#if defined(_TINYDIR_MALLOC) && defined(_TINYDIR_FREE)
#elif !defined(_TINYDIR_MALLOC) && !defined(_TINYDIR_FREE)
#else
#error "Either define both alloc and free or none of them!"
#endif

#if !defined(_TINYDIR_MALLOC)
#define _TINYDIR_MALLOC(_size) malloc(_size)
#define _TINYDIR_FREE(_ptr)    free(_ptr)
#endif /* !defined(_TINYDIR_MALLOC) */

typedef struct tinydir_file {
  _tinydir_char_t  path[_TINYDIR_PATH_MAX];
  _tinydir_char_t  name[_TINYDIR_FILENAME_MAX];
  _tinydir_char_t* extension;
  int              is_dir;
  int              is_reg;

#ifndef _MSC_VER
#ifdef __MINGW32__
  struct _stat _s;
#else
  struct stat _s;
#endif
#endif
} tinydir_file;

typedef struct tinydir_dir {
  _tinydir_char_t path[_TINYDIR_PATH_MAX];
  int             has_next;
  size_t          n_files;

  tinydir_file* _files;
#ifdef _MSC_VER
  HANDLE          _h;
  WIN32_FIND_DATA _f;
#else
  _TINYDIR_DIR*           _d;
  struct _tinydir_dirent* _e;
#ifndef _TINYDIR_USE_READDIR
  struct _tinydir_dirent* _ep;
#endif
#endif
} tinydir_dir;

/* declarations */

_TINYDIR_FUNC
int tinydir_open(tinydir_dir* dir, const _tinydir_char_t* path);
_TINYDIR_FUNC
int tinydir_open_sorted(tinydir_dir* dir, const _tinydir_char_t* path);
_TINYDIR_FUNC
void tinydir_close(tinydir_dir* dir);

_TINYDIR_FUNC
int tinydir_next(tinydir_dir* dir);
_TINYDIR_FUNC
int tinydir_readfile(const tinydir_dir* dir, tinydir_file* file);
_TINYDIR_FUNC
int tinydir_readfile_n(const tinydir_dir* dir, tinydir_file* file, size_t i);
_TINYDIR_FUNC
int tinydir_open_subdir_n(tinydir_dir* dir, size_t i);

_TINYDIR_FUNC
int tinydir_file_open(tinydir_file* file, const _tinydir_char_t* path);
_TINYDIR_FUNC
void _tinydir_get_ext(tinydir_file* file);
_TINYDIR_FUNC
int _TINYDIR_CDECL _tinydir_file_cmp(const void* a, const void* b);
#ifndef _MSC_VER
#ifndef _TINYDIR_USE_READDIR
_TINYDIR_FUNC
size_t _tinydir_dirent_buf_size(_TINYDIR_DIR* dirp);
#endif
#endif

/* definitions*/

_TINYDIR_FUNC
int tinydir_open(tinydir_dir* dir, const _tinydir_char_t* path) {
#ifndef _MSC_VER
#ifndef _TINYDIR_USE_READDIR
  int error;
  int size; /* using int size */
#endif
#else
  _tinydir_char_t path_buf[_TINYDIR_PATH_MAX];
#endif
  _tinydir_char_t* pathp;

  if (dir == NULL || path == NULL || _tinydir_strlen(path) == 0) {
    errno = EINVAL;
    return -1;
  }
  if (_tinydir_strlen(path) + _TINYDIR_PATH_EXTRA >= _TINYDIR_PATH_MAX) {
    errno = ENAMETOOLONG;
    return -1;
  }

  /* initialise dir */
  dir->_files = NULL;
#ifdef _MSC_VER
  dir->_h = INVALID_HANDLE_VALUE;
#else
  dir->_d = NULL;
#ifndef _TINYDIR_USE_READDIR
  dir->_ep = NULL;
#endif
#endif
  tinydir_close(dir);

  _tinydir_strcpy(dir->path, path);
  /* Remove trailing slashes */
  pathp = &dir->path[_tinydir_strlen(dir->path) - 1];
  while (pathp != dir->path &&
         (*pathp == TINYDIR_STRING('\\') || *pathp == TINYDIR_STRING('/'))) {
    *pathp = TINYDIR_STRING('\0');
    pathp++;
  }
#ifdef _MSC_VER
  _tinydir_strcpy(path_buf, dir->path);
  _tinydir_strcat(path_buf, TINYDIR_STRING("\\*"));
#if (defined WINAPI_FAMILY) && (WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP)
  dir->_h = FindFirstFileEx(
      path_buf, FindExInfoStandard, &dir->_f, FindExSearchNameMatch, NULL, 0);
#else
  dir->_h = FindFirstFile(path_buf, &dir->_f);
#endif
  if (dir->_h == INVALID_HANDLE_VALUE) {
    errno = ENOENT;
#else
  dir->_d = _tinydir_opendir(path);
  if (dir->_d == NULL) {
#endif
    goto bail;
  }

  /* read first file */
  dir->has_next = 1;
#ifndef _MSC_VER
#ifdef _TINYDIR_USE_READDIR
  dir->_e = _tinydir_readdir(dir->_d);
#else
  /* allocate dirent buffer for readdir_r */
  size = _tinydir_dirent_buf_size(dir->_d); /* conversion to int */
  if (size == -1)
    return -1;
  dir->_ep = (struct _tinydir_dirent*)_TINYDIR_MALLOC(size);
  if (dir->_ep == NULL)
    return -1;

  error = readdir_r(dir->_d, dir->_ep, &dir->_e);
  if (error != 0)
    return -1;
#endif
  if (dir->_e == NULL) {
    dir->has_next = 0;
  }
#endif

  return 0;

bail:
  tinydir_close(dir);
  return -1;
}

_TINYDIR_FUNC
int tinydir_open_sorted(tinydir_dir* dir, const _tinydir_char_t* path) {
  /* Count the number of files first, to pre-allocate the files array */
  size_t n_files = 0;
  if (tinydir_open(dir, path) == -1) {
    return -1;
  }
  while (dir->has_next) {
    n_files++;
    if (tinydir_next(dir) == -1) {
      goto bail;
    }
  }
  tinydir_close(dir);

  if (n_files == 0 || tinydir_open(dir, path) == -1) {
    return -1;
  }

  dir->n_files = 0;
  dir->_files  = (tinydir_file*)_TINYDIR_MALLOC(sizeof *dir->_files * n_files);
  if (dir->_files == NULL) {
    goto bail;
  }
  while (dir->has_next) {
    tinydir_file* p_file;
    dir->n_files++;

    p_file = &dir->_files[dir->n_files - 1];
    if (tinydir_readfile(dir, p_file) == -1) {
      goto bail;
    }

    if (tinydir_next(dir) == -1) {
      goto bail;
    }

    /* Just in case the number of files has changed between the first and
    second reads, terminate without writing into unallocated memory */
    if (dir->n_files == n_files) {
      break;
    }
  }

  qsort(dir->_files, dir->n_files, sizeof(tinydir_file), _tinydir_file_cmp);

  return 0;

bail:
  tinydir_close(dir);
  return -1;
}

_TINYDIR_FUNC
void tinydir_close(tinydir_dir* dir) {
  if (dir == NULL) {
    return;
  }

  memset(dir->path, 0, sizeof(dir->path));
  dir->has_next = 0;
  dir->n_files  = 0;
  _TINYDIR_FREE(dir->_files);
  dir->_files = NULL;
#ifdef _MSC_VER
  if (dir->_h != INVALID_HANDLE_VALUE) {
    FindClose(dir->_h);
  }
  dir->_h = INVALID_HANDLE_VALUE;
#else
  if (dir->_d) {
    _tinydir_closedir(dir->_d);
  }
  dir->_d = NULL;
  dir->_e = NULL;
#ifndef _TINYDIR_USE_READDIR
  _TINYDIR_FREE(dir->_ep);
  dir->_ep = NULL;
#endif
#endif
}

_TINYDIR_FUNC
int tinydir_next(tinydir_dir* dir) {
  if (dir == NULL) {
    errno = EINVAL;
    return -1;
  }
  if (!dir->has_next) {
    errno = ENOENT;
    return -1;
  }

#ifdef _MSC_VER
  if (FindNextFile(dir->_h, &dir->_f) == 0)
#else
#ifdef _TINYDIR_USE_READDIR
  dir->_e = _tinydir_readdir(dir->_d);
#else
  if (dir->_ep == NULL) {
    return -1;
  }
  if (readdir_r(dir->_d, dir->_ep, &dir->_e) != 0) {
    return -1;
  }
#endif
  if (dir->_e == NULL)
#endif
  {
    dir->has_next = 0;
#ifdef _MSC_VER
    if (GetLastError() != ERROR_SUCCESS &&
        GetLastError() != ERROR_NO_MORE_FILES) {
      tinydir_close(dir);
      errno = EIO;
      return -1;
    }
#endif
  }

  return 0;
}

_TINYDIR_FUNC
int tinydir_readfile(const tinydir_dir* dir, tinydir_file* file) {
  const _tinydir_char_t* filename;
  if (dir == NULL || file == NULL) {
    errno = EINVAL;
    return -1;
  }
#ifdef _MSC_VER
  if (dir->_h == INVALID_HANDLE_VALUE)
#else
  if (dir->_e == NULL)
#endif
  {
    errno = ENOENT;
    return -1;
  }
  filename =
#ifdef _MSC_VER
      dir->_f.cFileName;
#else
      dir->_e->d_name;
#endif
  if (_tinydir_strlen(dir->path) + _tinydir_strlen(filename) + 1 +
          _TINYDIR_PATH_EXTRA >=
      _TINYDIR_PATH_MAX) {
    /* the path for the file will be too long */
    errno = ENAMETOOLONG;
    return -1;
  }
  if (_tinydir_strlen(filename) >= _TINYDIR_FILENAME_MAX) {
    errno = ENAMETOOLONG;
    return -1;
  }

  _tinydir_strcpy(file->path, dir->path);
  if (_tinydir_strcmp(dir->path, TINYDIR_STRING("/")) != 0)
    _tinydir_strcat(file->path, TINYDIR_STRING("/"));
  _tinydir_strcpy(file->name, filename);
  _tinydir_strcat(file->path, filename);
#ifndef _MSC_VER
#ifdef __MINGW32__
  if (_tstat(
#elif (defined _BSD_SOURCE) || (defined _DEFAULT_SOURCE) ||        \
    ((defined _XOPEN_SOURCE) && (_XOPEN_SOURCE >= 500)) ||         \
    ((defined _POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L)) || \
    ((defined __APPLE__) && (defined __MACH__)) || (defined BSD)
  if (lstat(
#else
  if (stat(
#endif
          file->path, &file->_s) == -1) {
    return -1;
  }
#endif
  _tinydir_get_ext(file);

  file->is_dir =
#ifdef _MSC_VER
      !!(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
#else
      S_ISDIR(file->_s.st_mode);
#endif
  file->is_reg =
#ifdef _MSC_VER
      !!(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_NORMAL) ||
      (!(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_DEVICE) &&
       !(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
       !(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_ENCRYPTED) &&
#ifdef FILE_ATTRIBUTE_INTEGRITY_STREAM
       !(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_INTEGRITY_STREAM) &&
#endif
#ifdef FILE_ATTRIBUTE_NO_SCRUB_DATA
       !(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_NO_SCRUB_DATA) &&
#endif
       !(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_OFFLINE) &&
       !(dir->_f.dwFileAttributes & FILE_ATTRIBUTE_TEMPORARY));
#else
      S_ISREG(file->_s.st_mode);
#endif

  return 0;
}

_TINYDIR_FUNC
int tinydir_readfile_n(const tinydir_dir* dir, tinydir_file* file, size_t i) {
  if (dir == NULL || file == NULL) {
    errno = EINVAL;
    return -1;
  }
  if (i >= dir->n_files) {
    errno = ENOENT;
    return -1;
  }

  memcpy(file, &dir->_files[i], sizeof(tinydir_file));
  _tinydir_get_ext(file);

  return 0;
}

_TINYDIR_FUNC
int tinydir_open_subdir_n(tinydir_dir* dir, size_t i) {
  _tinydir_char_t path[_TINYDIR_PATH_MAX];
  if (dir == NULL) {
    errno = EINVAL;
    return -1;
  }
  if (i >= dir->n_files || !dir->_files[i].is_dir) {
    errno = ENOENT;
    return -1;
  }

  _tinydir_strcpy(path, dir->_files[i].path);
  tinydir_close(dir);
  if (tinydir_open_sorted(dir, path) == -1) {
    return -1;
  }

  return 0;
}

/* Open a single file given its path */
_TINYDIR_FUNC
int tinydir_file_open(tinydir_file* file, const _tinydir_char_t* path) {
  tinydir_dir      dir;
  int              result = 0;
  int              found  = 0;
  _tinydir_char_t  dir_name_buf[_TINYDIR_PATH_MAX];
  _tinydir_char_t  file_name_buf[_TINYDIR_PATH_MAX];
  _tinydir_char_t* dir_name;
  _tinydir_char_t* base_name;
#if (defined _MSC_VER || defined __MINGW32__)
  _tinydir_char_t drive_buf[_TINYDIR_PATH_MAX];
  _tinydir_char_t ext_buf[_TINYDIR_FILENAME_MAX];
#endif

  if (file == NULL || path == NULL || _tinydir_strlen(path) == 0) {
    errno = EINVAL;
    return -1;
  }
  if (_tinydir_strlen(path) + _TINYDIR_PATH_EXTRA >= _TINYDIR_PATH_MAX) {
    errno = ENAMETOOLONG;
    return -1;
  }

  /* Get the parent path */
#if (defined _MSC_VER || defined __MINGW32__)
#if ((defined _MSC_VER) && (_MSC_VER >= 1400))
  errno = _tsplitpath_s(
      path, drive_buf, _TINYDIR_DRIVE_MAX, dir_name_buf, _TINYDIR_FILENAME_MAX,
      file_name_buf, _TINYDIR_FILENAME_MAX, ext_buf, _TINYDIR_FILENAME_MAX);
#else
  _tsplitpath(path, drive_buf, dir_name_buf, file_name_buf, ext_buf);
#endif

  if (errno) {
    return -1;
  }

/* _splitpath_s not work fine with only filename and widechar support */
#ifdef _UNICODE
  if (drive_buf[0] == L'\xFEFE')
    drive_buf[0] = '\0';
  if (dir_name_buf[0] == L'\xFEFE')
    dir_name_buf[0] = '\0';
#endif

  /* Emulate the behavior of dirname by returning "." for dir name if it's
  empty */
  if (drive_buf[0] == '\0' && dir_name_buf[0] == '\0') {
    _tinydir_strcpy(dir_name_buf, TINYDIR_STRING("."));
  }
  /* Concatenate the drive letter and dir name to form full dir name */
  _tinydir_strcat(drive_buf, dir_name_buf);
  dir_name = drive_buf;
  /* Concatenate the file name and extension to form base name */
  _tinydir_strcat(file_name_buf, ext_buf);
  base_name = file_name_buf;
#else
  _tinydir_strcpy(dir_name_buf, path);
  dir_name = dirname(dir_name_buf);
  _tinydir_strcpy(file_name_buf, path);
  base_name = basename(file_name_buf);
#endif

  /* Special case: if the path is a root dir, open the parent dir as the file */
#if (defined _MSC_VER || defined __MINGW32__)
  if (_tinydir_strlen(base_name) == 0)
#else
  if ((_tinydir_strcmp(base_name, TINYDIR_STRING("/"))) == 0)
#endif
  {
    memset(file, 0, sizeof *file);
    file->is_dir = 1;
    file->is_reg = 0;
    _tinydir_strcpy(file->path, dir_name);
    file->extension = file->path + _tinydir_strlen(file->path);
    return 0;
  }

  /* Open the parent directory */
  if (tinydir_open(&dir, dir_name) == -1) {
    return -1;
  }

  /* Read through the parent directory and look for the file */
  while (dir.has_next) {
    if (tinydir_readfile(&dir, file) == -1) {
      result = -1;
      goto bail;
    }
    if (_tinydir_strcmp(file->name, base_name) == 0) {
      /* File found */
      found = 1;
      break;
    }
    tinydir_next(&dir);
  }
  if (!found) {
    result = -1;
    errno  = ENOENT;
  }

bail:
  tinydir_close(&dir);
  return result;
}

_TINYDIR_FUNC
void _tinydir_get_ext(tinydir_file* file) {
  _tinydir_char_t* period = _tinydir_strrchr(file->name, TINYDIR_STRING('.'));
  if (period == NULL) {
    file->extension = &(file->name[_tinydir_strlen(file->name)]);
  } else {
    file->extension = period + 1;
  }
}

_TINYDIR_FUNC
int _TINYDIR_CDECL _tinydir_file_cmp(const void* a, const void* b) {
  const tinydir_file* fa = (const tinydir_file*)a;
  const tinydir_file* fb = (const tinydir_file*)b;
  if (fa->is_dir != fb->is_dir) {
    return -(fa->is_dir - fb->is_dir);
  }
  return _tinydir_strncmp(fa->name, fb->name, _TINYDIR_FILENAME_MAX);
}

#ifndef _MSC_VER
#ifndef _TINYDIR_USE_READDIR
/*
The following authored by Ben Hutchings <ben@decadent.org.uk>
from https://womble.decadent.org.uk/readdir_r-advisory.html
*/
/* Calculate the required buffer size (in bytes) for directory      *
 * entries read from the given directory handle.  Return -1 if this  *
 * this cannot be done.                                              *
 *                                                                   *
 * This code does not trust values of NAME_MAX that are less than    *
 * 255, since some systems (including at least HP-UX) incorrectly    *
 * define it to be a smaller value.                                  */
_TINYDIR_FUNC
size_t _tinydir_dirent_buf_size(_TINYDIR_DIR* dirp) {
  long   name_max;
  size_t name_end;
  /* parameter may be unused */
  (void)dirp;

#if defined _TINYDIR_USE_FPATHCONF
  name_max = fpathconf(dirfd(dirp), _PC_NAME_MAX);
  if (name_max == -1)
#if defined(NAME_MAX)
    name_max = (NAME_MAX > 255) ? NAME_MAX : 255;
#else
    return (size_t)(-1);
#endif
#elif defined(NAME_MAX)
  name_max = (NAME_MAX > 255) ? NAME_MAX : 255;
#else
#error "buffer size for readdir_r cannot be determined"
#endif
  name_end = (size_t)offsetof(struct _tinydir_dirent, d_name) + name_max + 1;
  return (
      name_end > sizeof(struct _tinydir_dirent)
          ? name_end
          : sizeof(struct _tinydir_dirent));
}
#endif
#endif

#ifdef __cplusplus
}
#endif

#if defined(_MSC_VER)
#pragma warning(pop)
#endif

#endif