/*

 * fontconfig/src/fccompat.c

 *

 * Copyright © 2012 Red Hat, Inc.

 *

 * Author(s):

 *  Akira TAGOH

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that

 * copyright notice and this permission notice appear in supporting

 * documentation, and that the name of the author(s) not be used in

 * advertising or publicity pertaining to distribution of the software without

 * specific, written prior permission.  The authors make no

 * representations about the suitability of this software for any purpose.  It

 * is provided "as is" without express or implied warranty.

 *

 * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

 * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR

 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,

 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER

 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR

 * PERFORMANCE OF THIS SOFTWARE.

 */

#include "fcint.h"

#include <errno.h>

#if HAVE_SYS_TYPES_H

#  include <sys/types.h>

#endif

#if HAVE_SYS_STAT_H

#  include <sys/stat.h>

#endif

#if HAVE_FCNTL_H

#  include <fcntl.h>

#endif

#if HAVE_UNISTD_H

#  include <unistd.h>

#endif

#include <stdarg.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#ifdef O_CLOEXEC

#  define FC_O_CLOEXEC O_CLOEXEC

#else

#  define FC_O_CLOEXEC 0

#endif

#ifdef O_LARGEFILE

#  define FC_O_LARGEFILE O_LARGEFILE

#else

#  define FC_O_LARGEFILE 0

#endif

#ifdef O_BINARY

#  define FC_O_BINARY O_BINARY

#else

#  define FC_O_BINARY 0

#endif

#ifdef O_TEMPORARY

#  define FC_O_TEMPORARY O_TEMPORARY

#else

#  define FC_O_TEMPORARY 0

#endif

#ifdef O_NOINHERIT

#  define FC_O_NOINHERIT O_NOINHERIT

#else

#  define FC_O_NOINHERIT 0

#endif

#ifndef HAVE_UNISTD_H

/* Values for the second argument to access. These may be OR'd together. */

#  ifndef R_OK

#    define R_OK 4 /* Test for read permission.  */

#  endif

#  ifndef W_OK

#    define W_OK 2 /* Test for write permission.  */

#  endif

#  ifndef F_OK

#    define F_OK 0 /* Test for existence.  */

#  endif

typedef int mode_t;

#endif /* !HAVE_UNISTD_H */

#if !defined(HAVE_MKOSTEMP) && !defined(HAVE_MKSTEMP) && !defined(HAVE__MKTEMP_S)

static int

mkstemp (char *template)

{

    static const char s[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    int               fd, i;

    size_t            l;

    if (template == NULL) {

  errno = EINVAL;

  return -1;

    }

    l = strlen (template);

    if (l < 6 || strcmp (&template[l - 6], "XXXXXX") != 0) {

  errno = EINVAL;

  return -1;

    }

    do {

  errno = 0;

  for (i = l - 6; i < l; i++) {

      int r = FcRandom();

      template[i] = s[r % 62];

  }

  fd = FcOpen (template, FC_O_BINARY | O_CREAT | O_EXCL | FC_O_TEMPORARY | FC_O_NOINHERIT | O_RDWR, 0600);

    } while (fd < 0 && errno == EEXIST);

    if (fd >= 0)

  errno = 0;

    return fd;

}

#  define HAVE_MKSTEMP 1

#endif

int

FcOpen (const char *pathname, int flags, ...)

{

    int fd = -1;

    if (flags & O_CREAT) {

  va_list ap;

  mode_t  mode;

  va_start (ap, flags);

  mode = (mode_t)va_arg (ap, int);

  va_end (ap);

  fd = open (pathname, flags | FC_O_CLOEXEC | FC_O_LARGEFILE, mode);

    } else {

  fd = open (pathname, flags | FC_O_CLOEXEC | FC_O_LARGEFILE);

    }

    return fd;

}

int

FcMakeTempfile (char *template)

{

    int fd = -1;

#if HAVE_MKOSTEMP

    fd = mkostemp (template, FC_O_CLOEXEC);

#elif HAVE_MKSTEMP

    fd = mkstemp (template);

#  ifdef F_DUPFD_CLOEXEC

    if (fd != -1) {

  int newfd = fcntl (fd, F_DUPFD_CLOEXEC, STDIN_FILENO);

  close (fd);

  fd = newfd;

    }

#  elif defined(FD_CLOEXEC)

    if (fd != -1) {

  fcntl (fd, F_SETFD, fcntl (fd, F_GETFD) | FD_CLOEXEC);

    }

#  endif

#elif HAVE__MKTEMP_S

    if (_mktemp_s (template, strlen (template) + 1) != 0)

  return -1;

    fd = FcOpen (template, O_RDWR | O_EXCL | O_CREAT, 0600);

#endif

    return fd;

}

int32_t

FcRandom (void)

{

    int32_t result;

#if HAVE_RANDOM_R

    static struct random_data fcrandbuf;

    static char               statebuf[256];

    static FcBool             initialized = FcFalse;

#  ifdef _AIX

    static char *retval;

    long         res;

#  endif

    if (initialized != FcTrue) {

#  ifdef _AIX

  initstate_r (time (NULL), statebuf, 256, &retval, &fcrandbuf);

#  else

  initstate_r (time (NULL), statebuf, 256, &fcrandbuf);

#  endif

  initialized = FcTrue;

    }

#  ifdef _AIX

    random_r (&res, &fcrandbuf);

    result = (int32_t)res;

#  else

    random_r (&fcrandbuf, &result);

#  endif

#elif HAVE_RANDOM

    static char   statebuf[256];

    char         *state;

    static FcBool initialized = FcFalse;

    if (initialized != FcTrue) {

  state = initstate (time (NULL), statebuf, 256);

  initialized = FcTrue;

    } else

  state = setstate (statebuf);

    result = random();

    setstate (state);

#elif HAVE_LRAND48

    result = lrand48();

#elif HAVE_RAND_R

    static unsigned int seed;

    seed = time (NULL);

    result = rand_r (&seed);

#elif HAVE_RAND

    static FcBool initialized = FcFalse;

    if (initialized != FcTrue) {

  srand (time (NULL));

  initialized = FcTrue;

    }

    result = rand();

#else

#  error no random number generator function available.

#endif

    return result;

}

#ifdef _WIN32

#  include <direct.h>

#  define mkdir(path, mode) _mkdir (path)

#endif

FcBool

FcMakeDirectory (const FcChar8 *dir)

{

    FcChar8 *parent;

    FcBool   ret;

    if (strlen ((char *)dir) == 0)

  return FcFalse;

    parent = FcStrDirname (dir);

    if (!parent)

  return FcFalse;

    if (access ((char *)parent, F_OK) == 0)

  ret = mkdir ((char *)dir, 0755) == 0 && chmod ((char *)dir, 0755) == 0;

    else if (access ((char *)parent, F_OK) == -1)

  ret = FcMakeDirectory (parent) && (mkdir ((char *)dir, 0755) == 0) && chmod ((char *)dir, 0755) == 0;

    else

  ret = FcFalse;

    FcStrFree (parent);

    return ret;

}

ssize_t

FcReadLink (const FcChar8 *pathname,

            FcChar8       *buf,

            size_t         bufsiz)

{

#ifdef HAVE_READLINK

    return readlink ((const char *)pathname, (char *)buf, bufsiz);

#else

    /* XXX: this function is only used for FcConfigRealFilename() so far

     * and returning -1 as an error still just works.

     */

    errno = ENOSYS;

    return -1;

#endif

}

/* On Windows MingW provides dirent.h / openddir(), but MSVC does not */

#ifndef HAVE_DIRENT_H

struct DIR {

    struct dirent   d_ent;

    HANDLE          handle;

    WIN32_FIND_DATA fdata;

    FcBool          valid;

};

FcPrivate DIR *

FcCompatOpendirWin32 (const char *dirname)

{

    size_t len;

    char  *name;

    DIR   *dir;

    dir = calloc (1, sizeof (struct DIR));

    if (dir == NULL)

  return NULL;

    len = strlen (dirname);

    name = malloc (len + 3);

    if (name == NULL) {

  free (dir);

  return NULL;

    }

    memcpy (name, dirname, len);

    name[len++] = FC_DIR_SEPARATOR;

    name[len++] = '*';

    name[len] = '\0';

    dir->handle = FindFirstFileEx (name, FindExInfoBasic, &dir->fdata, FindExSearchNameMatch, NULL, 0);

    free (name);

    if (!dir->handle) {

  free (dir);

  dir = NULL;

  if (GetLastError() == ERROR_FILE_NOT_FOUND)

      errno = ENOENT;

  else

      errno = EACCES;

    }

    dir->valid = FcTrue;

    return dir;

}

FcPrivate struct dirent *

FcCompatReaddirWin32 (DIR *dir)

{

    if (dir->valid != FcTrue)

  return NULL;

    dir->d_ent.d_name = dir->fdata.cFileName;

    if ((dir->fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0)

  dir->d_ent.d_type = DT_DIR;

    else if (dir->fdata.dwFileAttributes == FILE_ATTRIBUTE_NORMAL)

  dir->d_ent.d_type = DT_REG;

    else

  dir->d_ent.d_type = DT_UNKNOWN;

    if (!FindNextFile (dir->handle, &dir->fdata))

  dir->valid = FcFalse;

    return &dir->d_ent;

}

FcPrivate int

FcCompatClosedirWin32 (DIR *dir)

{

    if (dir != NULL && dir->handle != NULL) {

  FindClose (dir->handle);

  free (dir);

    }

    return 0;

}

#endif /* HAVE_DIRENT_H */

#define __fccompat__

#include "fcaliastail.h"

#undef __fccompat__