/*
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005-2015, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/F
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library /
 * Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Michael Jerris <mike@jerris.com>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Michael Jerris <mike@jerris.com>
 * Eliot Gable <egable@gmail.com>
 * William King <william.king@quentustech.com>
 *
 * switch_apr.c -- apr wrappers and extensions
 *
 */

#include "switch.h"
#ifndef WIN32
#include <switch_private.h>
#endif
#include "private/switch_apr_pvt.h"
#include "private/switch_core_pvt.h"

/* apr headers*/
#include <fspr.h>
#include <fspr_atomic.h>
#include <fspr_errno.h>
#include <fspr_file_io.h>
#include <fspr_hash.h>
#include <fspr_network_io.h>
#include <fspr_poll.h>
#include <fspr_pools.h>
#include <fspr_portable.h>
#include <fspr_strings.h>
#include <fspr_thread_cond.h>
#include <fspr_thread_mutex.h>
#include <fspr_thread_proc.h>
#include <fspr_thread_rwlock.h>
#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include <fspr_file_info.h>
#include <fspr_fnmatch.h>
#include <fspr_tables.h>
#include <fspr_want.h>

#ifdef WIN32
#include "fspr_arch_networkio.h"
/* Missing socket symbols */
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
#endif
#endif

/* fspr_vformatter_buff_t definition*/
#include <fspr_lib.h>

#if (defined(HAVE_LIBMD5) || defined(HAVE_LIBMD) || defined(HAVE_MD5INIT))
#include <md5.h>
#elif defined(HAVE_LIBCRYPTO)
#ifndef OPENSSL_VERSION_NUMBER
#include <openssl/opensslv.h>
#endif
#if OPENSSL_VERSION_NUMBER < 0x30000000
#include <openssl/md5.h>
#else
#include <openssl/evp.h>
#endif
#else
#include <apr_md5.h>
#endif

#ifndef WIN32
#include <uuid/uuid.h>
#endif

/* apr stubs */

SWITCH_DECLARE(int) switch_status_is_timeup(int status) {
  return APR_STATUS_IS_TIMEUP(status);
}

/* Memory Pools */

SWITCH_DECLARE(switch_thread_id_t) switch_thread_self(void) {
#ifndef WIN32
  return fspr_os_thread_current();
#else
  return (switch_thread_id_t)(GetCurrentThreadId());
#endif
}

SWITCH_DECLARE(int)
switch_thread_equal(switch_thread_id_t tid1, switch_thread_id_t tid2) {
#ifdef WIN32
  return (tid1 == tid2);
#else
  return fspr_os_thread_equal(tid1, tid2);
#endif
}

SWITCH_DECLARE(unsigned int)
switch_ci_hashfunc_default(const char *char_key, switch_ssize_t *klen) {
  unsigned int hash = 0;
  const unsigned char *key = (const unsigned char *)char_key;
  const unsigned char *p;
  fspr_ssize_t i;

  if (*klen == APR_HASH_KEY_STRING) {
    for (p = key; *p; p++) {
      hash = hash * 33 + tolower(*p);
    }
    *klen = p - key;
  } else {
    for (p = key, i = *klen; i; i--, p++) {
      hash = hash * 33 + tolower(*p);
    }
  }

  return hash;
}

SWITCH_DECLARE(unsigned int)
switch_hashfunc_default(const char *key, switch_ssize_t *klen) {
  return fspr_hashfunc_default(key, klen);
}

/* string functions */

SWITCH_DECLARE(switch_status_t)
switch_strftime(char *s, switch_size_t *retsize, switch_size_t max,
                const char *format, switch_time_exp_t *tm) {
  const char *p = format;

  if (!p)
    return SWITCH_STATUS_FALSE;

  while (*p) {
    if (*p == '%') {
      switch (*(++p)) {
      case 'C':
      case 'D':
      case 'r':
      case 'R':
      case 'T':
      case 'e':
      case 'a':
      case 'A':
      case 'b':
      case 'B':
      case 'c':
      case 'd':
      case 'H':
      case 'I':
      case 'j':
      case 'm':
      case 'M':
      case 'p':
      case 'S':
      case 'U':
      case 'w':
      case 'W':
      case 'x':
      case 'X':
      case 'y':
      case 'Y':
      case 'z':
      case 'Z':
      case '%':
        p++;
        continue;
      case '\0':
      default:
        return SWITCH_STATUS_FALSE;
      }
    }
    p++;
  }

  return fspr_strftime(s, retsize, max, format, (fspr_time_exp_t *)tm);
}

SWITCH_DECLARE(switch_status_t)
switch_strftime_nocheck(char *s, switch_size_t *retsize, switch_size_t max,
                        const char *format, switch_time_exp_t *tm) {
  return fspr_strftime(s, retsize, max, format, (fspr_time_exp_t *)tm);
}

SWITCH_DECLARE(int)
switch_snprintf(char *buf, switch_size_t len, const char *format, ...) {
  va_list ap;
  int ret;
  va_start(ap, format);
  ret = fspr_vsnprintf(buf, len, format, ap);
  va_end(ap);
  return ret;
}

SWITCH_DECLARE(int)
switch_vsnprintf(char *buf, switch_size_t len, const char *format, va_list ap) {
  return fspr_vsnprintf(buf, len, format, ap);
}

SWITCH_DECLARE(char *)
switch_copy_string(char *dst, const char *src, switch_size_t dst_size) {
  if (!dst)
    return NULL;
  if (!src) {
    *dst = '\0';
    return dst;
  }
  return fspr_cpystrn(dst, src, dst_size);
}

/* thread read write lock functions */

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_create(switch_thread_rwlock_t **rwlock,
                            switch_memory_pool_t *pool) {
  return fspr_thread_rwlock_create(rwlock, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_destroy(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_destroy(rwlock);
}

SWITCH_DECLARE(switch_memory_pool_t *)
switch_thread_rwlock_pool_get(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_pool_get(rwlock);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_rdlock(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_rdlock(rwlock);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_tryrdlock(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_tryrdlock(rwlock);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_wrlock(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_wrlock(rwlock);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_trywrlock(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_trywrlock(rwlock);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_trywrlock_timeout(switch_thread_rwlock_t *rwlock,
                                       int timeout) {
  int sanity = timeout * 2;

  while (sanity) {
    if (switch_thread_rwlock_trywrlock(rwlock) == SWITCH_STATUS_SUCCESS) {
      return SWITCH_STATUS_SUCCESS;
    }
    sanity--;
    switch_yield(500000);
  }

  return SWITCH_STATUS_FALSE;
}

SWITCH_DECLARE(switch_status_t)
switch_thread_rwlock_unlock(switch_thread_rwlock_t *rwlock) {
  return fspr_thread_rwlock_unlock(rwlock);
}

/* thread mutex functions */

SWITCH_DECLARE(switch_status_t)
switch_mutex_init(switch_mutex_t **lock, unsigned int flags,
                  switch_memory_pool_t *pool) {
#ifdef WIN32
  /* Old version of APR misunderstands mutexes. On Windows, mutexes are
     cross-process. APR has no reason to not use critical sections instead of
     mutexes. */
  if (flags == SWITCH_MUTEX_NESTED)
    flags = SWITCH_MUTEX_DEFAULT;
#endif
  return fspr_thread_mutex_create(lock, flags, pool);
}

SWITCH_DECLARE(switch_status_t) switch_mutex_destroy(switch_mutex_t *lock) {
  return fspr_thread_mutex_destroy(lock);
}

SWITCH_DECLARE(switch_status_t) switch_mutex_lock(switch_mutex_t *lock) {
  return fspr_thread_mutex_lock(lock);
}

SWITCH_DECLARE(switch_status_t) switch_mutex_unlock(switch_mutex_t *lock) {
  return fspr_thread_mutex_unlock(lock);
}

SWITCH_DECLARE(switch_status_t) switch_mutex_trylock(switch_mutex_t *lock) {
  return fspr_thread_mutex_trylock(lock);
}

/* time function stubs */

SWITCH_DECLARE(switch_time_t) switch_time_now(void) {
#if defined(HAVE_CLOCK_GETTIME) && defined(SWITCH_USE_CLOCK_FUNCS)
  struct timespec ts;
  clock_gettime(CLOCK_REALTIME, &ts);
  return ts.tv_sec * APR_USEC_PER_SEC + (ts.tv_nsec / 1000);
#else
  return (switch_time_t)fspr_time_now();
#endif
}

SWITCH_DECLARE(switch_status_t)
switch_time_exp_gmt_get(switch_time_t *result, switch_time_exp_t *input) {
  return fspr_time_exp_gmt_get((fspr_time_t *)result, (fspr_time_exp_t *)input);
}

SWITCH_DECLARE(switch_status_t)
switch_time_exp_get(switch_time_t *result, switch_time_exp_t *input) {
  return fspr_time_exp_get((fspr_time_t *)result, (fspr_time_exp_t *)input);
}

SWITCH_DECLARE(switch_status_t)
switch_time_exp_lt(switch_time_exp_t *result, switch_time_t input) {
  return fspr_time_exp_lt((fspr_time_exp_t *)result, input);
}

SWITCH_DECLARE(switch_status_t)
switch_time_exp_tz(switch_time_exp_t *result, switch_time_t input,
                   switch_int32_t offs) {
  return fspr_time_exp_tz((fspr_time_exp_t *)result, input, (fspr_int32_t)offs);
}

SWITCH_DECLARE(switch_status_t)
switch_time_exp_gmt(switch_time_exp_t *result, switch_time_t input) {
  return fspr_time_exp_gmt((fspr_time_exp_t *)result, input);
}

SWITCH_DECLARE(switch_status_t)
switch_rfc822_date(char *date_str, switch_time_t t) {
  return fspr_rfc822_date(date_str, t);
}

SWITCH_DECLARE(switch_time_t)
switch_time_make(switch_time_t sec, int32_t usec) {
  return ((switch_time_t)(sec)*APR_USEC_PER_SEC + (switch_time_t)(usec));
}

/* Thread condition locks */

SWITCH_DECLARE(switch_status_t)
switch_thread_cond_create(switch_thread_cond_t **cond,
                          switch_memory_pool_t *pool) {
  return fspr_thread_cond_create(cond, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_cond_wait(switch_thread_cond_t *cond, switch_mutex_t *mutex) {
  return fspr_thread_cond_wait(cond, mutex);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_cond_timedwait(switch_thread_cond_t *cond, switch_mutex_t *mutex,
                             switch_interval_time_t timeout) {
  fspr_status_t st = fspr_thread_cond_timedwait(cond, mutex, timeout);

  if (st == APR_TIMEUP) {
    st = SWITCH_STATUS_TIMEOUT;
  }

  return st;
}

SWITCH_DECLARE(switch_status_t)
switch_thread_cond_signal(switch_thread_cond_t *cond) {
  return fspr_thread_cond_signal(cond);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_cond_broadcast(switch_thread_cond_t *cond) {
  return fspr_thread_cond_broadcast(cond);
}

SWITCH_DECLARE(switch_status_t)
switch_thread_cond_destroy(switch_thread_cond_t *cond) {
  return fspr_thread_cond_destroy(cond);
}

/* file i/o stubs */

SWITCH_DECLARE(switch_status_t)
switch_file_open(switch_file_t **newf, const char *fname, int32_t flag,
                 switch_fileperms_t perm, switch_memory_pool_t *pool) {
  return fspr_file_open(newf, fname, flag, perm, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_file_seek(switch_file_t *thefile, switch_seek_where_t where,
                 int64_t *offset) {
  fspr_status_t rv;
  fspr_off_t off = (fspr_off_t)(*offset);
  rv = fspr_file_seek(thefile, where, &off);
  *offset = (int64_t)off;
  return rv;
}

SWITCH_DECLARE(switch_status_t)
switch_file_copy(const char *from_path, const char *to_path,
                 switch_fileperms_t perms, switch_memory_pool_t *pool) {
  return fspr_file_copy(from_path, to_path, perms, pool);
}

SWITCH_DECLARE(switch_status_t) switch_file_close(switch_file_t *thefile) {
  return fspr_file_close(thefile);
}

SWITCH_DECLARE(switch_status_t)
switch_file_trunc(switch_file_t *thefile, int64_t offset) {
  return fspr_file_trunc(thefile, offset);
}

SWITCH_DECLARE(switch_status_t)
switch_file_lock(switch_file_t *thefile, int type) {
  return fspr_file_lock(thefile, type);
}

SWITCH_DECLARE(switch_status_t)
switch_file_rename(const char *from_path, const char *to_path,
                   switch_memory_pool_t *pool) {
  return fspr_file_rename(from_path, to_path, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_file_remove(const char *path, switch_memory_pool_t *pool) {
  return fspr_file_remove(path, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_file_read(switch_file_t *thefile, void *buf, switch_size_t *nbytes) {
  return fspr_file_read(thefile, buf, nbytes);
}

SWITCH_DECLARE(switch_status_t)
switch_file_write(switch_file_t *thefile, const void *buf,
                  switch_size_t *nbytes) {
  return fspr_file_write(thefile, buf, nbytes);
}

SWITCH_DECLARE(int)
switch_file_printf(switch_file_t *thefile, const char *format, ...) {
  va_list ap;
  int ret;
  char *data;

  va_start(ap, format);

  if ((ret = switch_vasprintf(&data, format, ap)) != -1) {
    switch_size_t bytes = strlen(data);
    switch_file_write(thefile, data, &bytes);
    free(data);
  }

  va_end(ap);

  return ret;
}

SWITCH_DECLARE(switch_status_t)
switch_file_mktemp(switch_file_t **thefile, char *templ, int32_t flags,
                   switch_memory_pool_t *pool) {
  return fspr_file_mktemp(thefile, templ, flags, pool);
}

SWITCH_DECLARE(switch_size_t) switch_file_get_size(switch_file_t *thefile) {
  struct fspr_finfo_t finfo;
  return fspr_file_info_get(&finfo, APR_FINFO_SIZE, thefile) ==
                 SWITCH_STATUS_SUCCESS
             ? (switch_size_t)finfo.size
             : 0;
}

SWITCH_DECLARE(switch_status_t)
switch_directory_exists(const char *dirname, switch_memory_pool_t *pool) {
  fspr_dir_t *dir_handle;
  switch_memory_pool_t *our_pool = NULL;
  switch_status_t status;

  if (!pool) {
    switch_core_new_memory_pool(&our_pool);
    pool = our_pool;
  }

  if ((status = fspr_dir_open(&dir_handle, dirname, pool)) == APR_SUCCESS) {
    fspr_dir_close(dir_handle);
  }

  if (our_pool) {
    switch_core_destroy_memory_pool(&our_pool);
  }

  return status;
}

SWITCH_DECLARE(switch_status_t)
switch_file_exists(const char *filename, switch_memory_pool_t *pool) {
  int32_t wanted = APR_FINFO_TYPE;
  switch_memory_pool_t *our_pool = NULL;
  switch_status_t status = SWITCH_STATUS_FALSE;
  fspr_finfo_t info = {0};

  if (zstr(filename)) {
    return status;
  }

  if (!pool) {
    switch_core_new_memory_pool(&our_pool);
  }

  fspr_stat(&info, filename, wanted, pool ? pool : our_pool);
  if (info.filetype != APR_NOFILE) {
    status = SWITCH_STATUS_SUCCESS;
  }

  if (our_pool) {
    switch_core_destroy_memory_pool(&our_pool);
  }

  return status;
}

SWITCH_DECLARE(switch_status_t)
switch_dir_make(const char *path, switch_fileperms_t perm,
                switch_memory_pool_t *pool) {
  return fspr_dir_make(path, perm, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_dir_make_recursive(const char *path, switch_fileperms_t perm,
                          switch_memory_pool_t *pool) {
  return fspr_dir_make_recursive(path, perm, pool);
}

struct switch_dir {
  fspr_dir_t *dir_handle;
  fspr_finfo_t finfo;
};

SWITCH_DECLARE(switch_status_t)
switch_dir_open(switch_dir_t **new_dir, const char *dirname,
                switch_memory_pool_t *pool) {
  switch_status_t status;
  switch_dir_t *dir = malloc(sizeof(*dir));

  if (!dir) {
    *new_dir = NULL;
    return SWITCH_STATUS_FALSE;
  }

  memset(dir, 0, sizeof(*dir));
  if ((status = fspr_dir_open(&(dir->dir_handle), dirname, pool)) ==
      APR_SUCCESS) {
    *new_dir = dir;
  } else {
    free(dir);
    *new_dir = NULL;
  }

  return status;
}

SWITCH_DECLARE(switch_status_t) switch_dir_close(switch_dir_t *thedir) {
  switch_status_t status = fspr_dir_close(thedir->dir_handle);

  free(thedir);
  return status;
}

SWITCH_DECLARE(uint32_t) switch_dir_count(switch_dir_t *thedir) {
  const char *name;
  fspr_int32_t finfo_flags = APR_FINFO_DIRENT | APR_FINFO_TYPE | APR_FINFO_NAME;
  uint32_t count = 0;

  fspr_dir_rewind(thedir->dir_handle);

  while (fspr_dir_read(&(thedir->finfo), finfo_flags, thedir->dir_handle) ==
         SWITCH_STATUS_SUCCESS) {

    if (thedir->finfo.filetype != APR_REG &&
        thedir->finfo.filetype != APR_LNK) {
      continue;
    }

    if (!(name = thedir->finfo.fname)) {
      name = thedir->finfo.name;
    }

    if (name) {
      count++;
    }
  }

  fspr_dir_rewind(thedir->dir_handle);

  return count;
}

SWITCH_DECLARE(const char *)
switch_dir_next_file(switch_dir_t *thedir, char *buf, switch_size_t len) {
  const char *fname = NULL;
  fspr_int32_t finfo_flags = APR_FINFO_DIRENT | APR_FINFO_TYPE | APR_FINFO_NAME;
  const char *name;

  while (fspr_dir_read(&(thedir->finfo), finfo_flags, thedir->dir_handle) ==
         SWITCH_STATUS_SUCCESS) {

    if (thedir->finfo.filetype != APR_REG &&
        thedir->finfo.filetype != APR_LNK) {
      continue;
    }

    if (!(name = thedir->finfo.fname)) {
      name = thedir->finfo.name;
    }

    if (name) {
      switch_copy_string(buf, name, len);
      fname = buf;
      break;
    } else {
      continue;
    }
  }
  return fname;
}

/* thread stubs */

#ifndef WIN32
struct fspr_threadattr_t {
  fspr_pool_t *pool;
  pthread_attr_t attr;
  int priority;
};
#else
/* this needs to be revisited when apr for windows supports thread priority
 * settings */
/* search for WIN32 in this file */
struct fspr_threadattr_t {
  fspr_pool_t *pool;
  fspr_int32_t detach;
  fspr_size_t stacksize;
  int priority;
};
#endif

SWITCH_DECLARE(switch_status_t)
switch_threadattr_create(switch_threadattr_t **new_attr,
                         switch_memory_pool_t *pool) {
  switch_status_t status;

  if ((status = fspr_threadattr_create(new_attr, pool)) ==
      SWITCH_STATUS_SUCCESS) {

    (*new_attr)->priority = SWITCH_PRI_LOW;
  }

  return status;
}

SWITCH_DECLARE(switch_status_t)
switch_threadattr_detach_set(switch_threadattr_t *attr, int32_t on) {
  return fspr_threadattr_detach_set(attr, on);
}

SWITCH_DECLARE(switch_status_t)
switch_threadattr_stacksize_set(switch_threadattr_t *attr,
                                switch_size_t stacksize) {
  return fspr_threadattr_stacksize_set(attr, stacksize);
}

SWITCH_DECLARE(switch_status_t)
switch_threadattr_priority_set(switch_threadattr_t *attr,
                               switch_thread_priority_t priority) {

  attr->priority = priority;

  return SWITCH_STATUS_SUCCESS;
}

static char TT_KEY[] = "1";

SWITCH_DECLARE(switch_status_t)
switch_thread_create(switch_thread_t **new_thread, switch_threadattr_t *attr,
                     switch_thread_start_t func, void *data,
                     switch_memory_pool_t *cont) {
  switch_core_memory_pool_set_data(cont, "_in_thread", TT_KEY);
  return fspr_thread_create(new_thread, attr, func, data, cont);
}

SWITCH_DECLARE(switch_interval_time_t)
switch_interval_time_from_timeval(struct timeval *tvp) {
  return ((switch_interval_time_t)tvp->tv_sec * 1000000) + tvp->tv_usec / 1000;
}

/* socket stubs */

SWITCH_DECLARE(switch_status_t)
switch_os_sock_get(switch_os_socket_t *thesock, switch_socket_t *sock) {
  return fspr_os_sock_get(thesock, sock);
}

SWITCH_DECLARE(switch_status_t)
switch_os_sock_put(switch_socket_t **sock, switch_os_socket_t *thesock,
                   switch_memory_pool_t *pool) {
  return fspr_os_sock_put(sock, thesock, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_addr_get(switch_sockaddr_t **sa, switch_bool_t remote,
                       switch_socket_t *sock) {
  return fspr_socket_addr_get(sa, (fspr_interface_e)remote, sock);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_create(switch_socket_t **new_sock, int family, int type,
                     int protocol, switch_memory_pool_t *pool) {
  return fspr_socket_create(new_sock, family, type, protocol, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_shutdown(switch_socket_t *sock, switch_shutdown_how_e how) {
  return fspr_socket_shutdown(sock, (fspr_shutdown_how_e)how);
}

SWITCH_DECLARE(switch_status_t) switch_socket_close(switch_socket_t *sock) {
  return fspr_socket_close(sock);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_bind(switch_socket_t *sock, switch_sockaddr_t *sa) {
  return fspr_socket_bind(sock, sa);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_listen(switch_socket_t *sock, int32_t backlog) {
  return fspr_socket_listen(sock, backlog);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_accept(switch_socket_t **new_sock, switch_socket_t *sock,
                     switch_memory_pool_t *pool) {
  return fspr_socket_accept(new_sock, sock, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_connect(switch_socket_t *sock, switch_sockaddr_t *sa) {
  return fspr_socket_connect(sock, sa);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_send(switch_socket_t *sock, const char *buf, switch_size_t *len) {
  int status = SWITCH_STATUS_SUCCESS;
  switch_size_t req = *len, wrote = 0, need = *len;
  int to_count = 0;

  while ((wrote < req && status == SWITCH_STATUS_SUCCESS) ||
         (need == 0 && status == SWITCH_STATUS_BREAK) || status == 730035 ||
         status == 35) {
    need = req - wrote;
    status = fspr_socket_send(sock, buf + wrote, &need);
    if (status == SWITCH_STATUS_BREAK || status == 730035 || status == 35) {
      if (++to_count > 60000) {
        status = SWITCH_STATUS_FALSE;
        break;
      }
      switch_yield(10000);
    } else {
      to_count = 0;
    }
    wrote += need;
  }

  *len = wrote;
  return (switch_status_t)status;
}

SWITCH_DECLARE(switch_status_t)
switch_socket_send_nonblock(switch_socket_t *sock, const char *buf,
                            switch_size_t *len) {
  if (!sock || !buf || !len) {
    return SWITCH_STATUS_GENERR;
  }

  return fspr_socket_send(sock, buf, len);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_sendto(switch_socket_t *sock, switch_sockaddr_t *where,
                     int32_t flags, const char *buf, switch_size_t *len) {
  if (!where || !buf || !len || !*len) {
    return SWITCH_STATUS_GENERR;
  }
  return fspr_socket_sendto(sock, where, flags, buf, len);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_recv(switch_socket_t *sock, char *buf, switch_size_t *len) {
  int r;

  r = fspr_socket_recv(sock, buf, len);

  if (r == 35 || r == 730035) {
    r = SWITCH_STATUS_BREAK;
  }

  return (switch_status_t)r;
}

SWITCH_DECLARE(switch_status_t)
switch_sockaddr_create(switch_sockaddr_t **sa, switch_memory_pool_t *pool) {
  switch_sockaddr_t *new_sa;
  unsigned short family = APR_INET;

  new_sa = fspr_pcalloc(pool, sizeof(fspr_sockaddr_t));
  switch_assert(new_sa);
  new_sa->pool = pool;

  new_sa->family = family;
  new_sa->sa.sin.sin_family = family;

  new_sa->salen = sizeof(struct sockaddr_in);
  new_sa->addr_str_len = 16;
  new_sa->ipaddr_ptr = &(new_sa->sa.sin.sin_addr);
  new_sa->ipaddr_len = sizeof(struct in_addr);

  *sa = new_sa;
  return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t)
switch_sockaddr_info_get(switch_sockaddr_t **sa, const char *hostname,
                         int32_t family, switch_port_t port, int32_t flags,
                         switch_memory_pool_t *pool) {
  return fspr_sockaddr_info_get(sa, hostname, family, port, flags, pool);
}

SWITCH_DECLARE(switch_status_t)
switch_sockaddr_new(switch_sockaddr_t **sa, const char *ip, switch_port_t port,
                    switch_memory_pool_t *pool) {
  switch_status_t status = SWITCH_STATUS_SUCCESS;
  fspr_sockaddr_t *new_sa;
  int family;

  if (!sa || !pool || !ip) {
    switch_goto_status(SWITCH_STATUS_GENERR, end);
  }

  new_sa = fspr_pcalloc(pool, sizeof(fspr_sockaddr_t));
  switch_assert(new_sa);

  new_sa->pool = pool;

#if APR_HAVE_IPV6
  if (strchr(ip, ':')) {
    struct sockaddr_in6 sa6 = {0};

    family = APR_INET6;
    inet_pton(family, ip, &(sa6.sin6_addr));
    memcpy(&new_sa->sa, &sa6, sizeof(struct sockaddr_in6));
  } else
#endif
  {
    struct sockaddr_in sa4 = {0};

    family = APR_INET;
    inet_pton(family, ip, &(sa4.sin_addr));
    memcpy(&new_sa->sa, &sa4, sizeof(struct sockaddr_in));
  }

  new_sa->hostname = fspr_pstrdup(pool, ip);
  new_sa->family = family;
  new_sa->sa.sin.sin_family = family;
  if (port) {
    /* XXX IPv6: assumes sin_port and sin6_port at same offset */
    new_sa->sa.sin.sin_port = htons(port);
    new_sa->port = port;
  }

  if (family == APR_INET) {
    new_sa->salen = sizeof(struct sockaddr_in);
    new_sa->addr_str_len = 16;
    new_sa->ipaddr_ptr = &(new_sa->sa.sin.sin_addr);
    new_sa->ipaddr_len = sizeof(struct in_addr);
  }
#if APR_HAVE_IPV6
  else if (family == APR_INET6) {
    new_sa->salen = sizeof(struct sockaddr_in6);
    new_sa->addr_str_len = 46;
    new_sa->ipaddr_ptr = &(new_sa->sa.sin6.sin6_addr);
    new_sa->ipaddr_len = sizeof(struct in6_addr);
  }
#endif

  *sa = new_sa;

end:
  return status;
}

SWITCH_DECLARE(switch_status_t)
switch_socket_opt_set(switch_socket_t *sock, int32_t opt, int32_t on) {
  if (opt == SWITCH_SO_TCP_KEEPIDLE) {
#if defined(TCP_KEEPIDLE)
    int r = -10;
    r = setsockopt(sock->socketdes, SOL_TCP, TCP_KEEPIDLE, (void *)&on,
                   sizeof(on));
    return r ? SWITCH_STATUS_FALSE : SWITCH_STATUS_SUCCESS;
#else
    return SWITCH_STATUS_NOTIMPL;
#endif
  }

  if (opt == SWITCH_SO_TCP_KEEPINTVL) {
#if defined(TCP_KEEPINTVL)
    int r = -10;
    r = setsockopt(sock->socketdes, SOL_TCP, TCP_KEEPINTVL, (void *)&on,
                   sizeof(on));
    return r ? SWITCH_STATUS_FALSE : SWITCH_STATUS_SUCCESS;
#else
    return SWITCH_STATUS_NOTIMPL;
#endif
  }

  return fspr_socket_opt_set(sock, opt, on);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_timeout_get(switch_socket_t *sock, switch_interval_time_t *t) {
  fspr_interval_time_t at = 0;
  switch_status_t status = fspr_socket_timeout_get(sock, &at);
  *t = at;

  return status;
}

SWITCH_DECLARE(switch_status_t)
switch_socket_timeout_set(switch_socket_t *sock, switch_interval_time_t t) {
  return fspr_socket_timeout_set(sock, t);
}

SWITCH_DECLARE(switch_status_t)
switch_sockaddr_ip_get(char **addr, switch_sockaddr_t *sa) {
  return fspr_sockaddr_ip_get(addr, sa);
}

SWITCH_DECLARE(int)
switch_sockaddr_equal(const switch_sockaddr_t *sa1,
                      const switch_sockaddr_t *sa2) {
  return fspr_sockaddr_equal(sa1, sa2);
}

SWITCH_DECLARE(switch_status_t)
switch_mcast_join(switch_socket_t *sock, switch_sockaddr_t *join,
                  switch_sockaddr_t *iface, switch_sockaddr_t *source) {
  return fspr_mcast_join(sock, join, iface, source);
}

SWITCH_DECLARE(switch_status_t)
switch_mcast_hops(switch_socket_t *sock, uint8_t ttl) {
  return fspr_mcast_hops(sock, ttl);
}

SWITCH_DECLARE(switch_status_t)
switch_mcast_loopback(switch_socket_t *sock, uint8_t opt) {
  return fspr_mcast_loopback(sock, opt);
}

SWITCH_DECLARE(switch_status_t)
switch_mcast_interface(switch_socket_t *sock, switch_sockaddr_t *iface) {
  return fspr_mcast_interface(sock, iface);
}

/* socket functions */

SWITCH_DECLARE(const char *)
switch_get_addr(char *buf, switch_size_t len, switch_sockaddr_t *in) {
  if (!in) {
    return SWITCH_BLANK_STRING;
  }

  memset(buf, 0, len);

  if (in->family == AF_INET) {
    get_addr(buf, len, (struct sockaddr *)&in->sa, in->salen);
    return buf;
  }

  get_addr6(buf, len, (struct sockaddr_in6 *)&in->sa, in->salen);
  return buf;
}

SWITCH_DECLARE(int) switch_socket_fd_get(switch_socket_t *sock) {
  return fspr_socket_fd_get(sock);
}

SWITCH_DECLARE(uint16_t) switch_sockaddr_get_port(switch_sockaddr_t *sa) {
  return sa->port;
}

SWITCH_DECLARE(int32_t) switch_sockaddr_get_family(switch_sockaddr_t *sa) {
  return sa->family;
}

SWITCH_DECLARE(switch_status_t)
switch_getnameinfo(char **hostname, switch_sockaddr_t *sa, int32_t flags) {
  return fspr_getnameinfo(hostname, sa, flags);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_atmark(switch_socket_t *sock, int *atmark) {
  return fspr_socket_atmark(sock, atmark);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_recvfrom(switch_sockaddr_t *from, switch_socket_t *sock,
                       int32_t flags, char *buf, size_t *len) {
  int r = SWITCH_STATUS_GENERR;

  if (from && sock &&
      (r = fspr_socket_recvfrom(from, sock, flags, buf, len)) == APR_SUCCESS) {
    from->port = ntohs(from->sa.sin.sin_port);
    /* from->ipaddr_ptr = &(from->sa.sin.sin_addr);
     * from->ipaddr_ptr = inet_ntoa(from->sa.sin.sin_addr);
     */
  }

  if (r == 35 || r == 730035) {
    r = SWITCH_STATUS_BREAK;
  }

  return (switch_status_t)r;
}

/* poll stubs */

SWITCH_DECLARE(switch_status_t)
switch_pollset_create(switch_pollset_t **pollset, uint32_t size,
                      switch_memory_pool_t *pool, uint32_t flags) {
  return fspr_pollset_create(pollset, size, pool, flags);
}

SWITCH_DECLARE(switch_status_t)
switch_pollset_add(switch_pollset_t *pollset,
                   const switch_pollfd_t *descriptor) {
  if (!pollset || !descriptor) {
    return SWITCH_STATUS_FALSE;
  }

  return fspr_pollset_add((fspr_pollset_t *)pollset,
                          (const fspr_pollfd_t *)descriptor);
}

SWITCH_DECLARE(switch_status_t)
switch_pollset_remove(switch_pollset_t *pollset,
                      const switch_pollfd_t *descriptor) {
  if (!pollset || !descriptor) {
    return SWITCH_STATUS_FALSE;
  }

  return fspr_pollset_remove((fspr_pollset_t *)pollset,
                             (const fspr_pollfd_t *)descriptor);
}

SWITCH_DECLARE(switch_status_t)
switch_socket_create_pollfd(switch_pollfd_t **pollfd, switch_socket_t *sock,
                            int16_t flags, void *client_data,
                            switch_memory_pool_t *pool) {
  if (!pollfd || !sock) {
    return SWITCH_STATUS_FALSE;
  }

  if ((*pollfd = (switch_pollfd_t *)fspr_palloc(
           pool, sizeof(switch_pollfd_t))) == 0) {
    return SWITCH_STATUS_MEMERR;
  }

  memset(*pollfd, 0, sizeof(switch_pollfd_t));

  (*pollfd)->desc_type = (switch_pollset_type_t)APR_POLL_SOCKET;
  (*pollfd)->reqevents = flags;
  (*pollfd)->desc.s = sock;
  (*pollfd)->client_data = client_data;

  return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t)
switch_pollset_poll(switch_pollset_t *pollset, switch_interval_time_t timeout,
                    int32_t *num, const switch_pollfd_t **descriptors) {
  fspr_status_t st = SWITCH_STATUS_FALSE;

  if (pollset) {
    st = fspr_pollset_poll((fspr_pollset_t *)pollset, timeout, num,
                           (const fspr_pollfd_t **)descriptors);

    if (st == APR_TIMEUP) {
      st = SWITCH_STATUS_TIMEOUT;
    }
  }

  return st;
}

SWITCH_DECLARE(switch_status_t)
switch_poll(switch_pollfd_t *aprset, int32_t numsock, int32_t *nsds,
            switch_interval_time_t timeout) {
  fspr_status_t st = SWITCH_STATUS_FALSE;

  if (aprset) {
    st = fspr_poll((fspr_pollfd_t *)aprset, numsock, nsds, timeout);

    if (numsock == 1 && ((aprset[0].rtnevents & APR_POLLERR) ||
                         (aprset[0].rtnevents & APR_POLLHUP) ||
                         (aprset[0].rtnevents & APR_POLLNVAL))) {
      st = SWITCH_STATUS_GENERR;
    } else if (st == APR_TIMEUP) {
      st = SWITCH_STATUS_TIMEOUT;
    }
  }

  return st;
}

SWITCH_DECLARE(switch_status_t)
switch_socket_create_pollset(switch_pollfd_t **poll, switch_socket_t *sock,
                             int16_t flags, switch_memory_pool_t *pool) {
  switch_pollset_t *pollset;

  if (switch_pollset_create(&pollset, 1, pool, 0) != SWITCH_STATUS_SUCCESS) {
    return SWITCH_STATUS_GENERR;
  }

  if (switch_socket_create_pollfd(poll, sock, flags, sock, pool) !=
      SWITCH_STATUS_SUCCESS) {
    return SWITCH_STATUS_GENERR;
  }

  if (switch_pollset_add(pollset, *poll) != SWITCH_STATUS_SUCCESS) {
    return SWITCH_STATUS_GENERR;
  }

  return SWITCH_STATUS_SUCCESS;
}

/* apr-util stubs */

/* UUID Handling (apr-util) */

SWITCH_DECLARE(void)
switch_uuid_format(char *buffer, const switch_uuid_t *uuid) {
#ifndef WIN32
  uuid_unparse_lower(uuid->data, buffer);
#else
  RPC_CSTR buf;
  UuidToString((const UUID *)uuid, &buf);
  strcpy(buffer, (const char *)buf);
  RpcStringFree(&buf);
#endif
}

SWITCH_DECLARE(void) switch_uuid_get(switch_uuid_t *uuid) {
  switch_mutex_lock(runtime.uuid_mutex);
#ifndef WIN32
  uuid_generate(uuid->data);
#else
  UuidCreate((UUID *)uuid);
#endif
  switch_mutex_unlock(runtime.uuid_mutex);
}

SWITCH_DECLARE(switch_status_t)
switch_uuid_parse(switch_uuid_t *uuid, const char *uuid_str) {
#ifndef WIN32
  if (uuid_parse(uuid_str, uuid->data)) {
    return SWITCH_STATUS_FALSE;
  }
  return SWITCH_STATUS_SUCCESS;
#else
  return UuidFromString((RPC_CSTR)uuid_str, (UUID *)uuid);
#endif
}

SWITCH_DECLARE(switch_status_t)
switch_md5(unsigned char digest[SWITCH_MD5_DIGESTSIZE], const void *input,
           switch_size_t inputLen) {
#if (defined(HAVE_LIBMD5) || defined(HAVE_LIBMD) || defined(HAVE_MD5INIT))
  MD5_CTX md5_context;

  MD5Init(&md5_context);
  MD5Update(&md5_context, input, inputLen);
  MD5Final(digest, &md5_context);

  return SWITCH_STATUS_SUCCESS;
#elif defined(HAVE_LIBCRYPTO)
#if OPENSSL_VERSION_NUMBER < 0x30000000
  MD5_CTX md5_context;

  MD5_Init(&md5_context);
  MD5_Update(&md5_context, input, inputLen);
  MD5_Final(digest, &md5_context);
#else
  EVP_MD_CTX *md5_context;

  /* MD5_Init */
  md5_context = EVP_MD_CTX_new();
  EVP_DigestInit_ex(md5_context, EVP_md5(), NULL);
  /* MD5_Update */
  EVP_DigestUpdate(md5_context, input, inputLen);
  /* MD5_Final */
  EVP_DigestFinal_ex(md5_context, digest, NULL);
  EVP_MD_CTX_free(md5_context);
#endif

  return SWITCH_STATUS_SUCCESS;
#else
  return SWITCH_STATUS_NOTIMPL;
#endif
}

SWITCH_DECLARE(switch_status_t)
switch_md5_string(char digest_str[SWITCH_MD5_DIGEST_STRING_SIZE],
                  const void *input, switch_size_t inputLen) {
  unsigned char digest[SWITCH_MD5_DIGESTSIZE];
  switch_status_t status = switch_md5(digest, input, inputLen);
  short i, x;
  uint8_t b;

  digest_str[SWITCH_MD5_DIGEST_STRING_SIZE - 1] = '\0';

  for (x = i = 0; x < SWITCH_MD5_DIGESTSIZE; x++) {
    b = (digest[x] >> 4) & 15;
    digest_str[i++] = b + (b > 9 ? 'a' - 10 : '0');
    b = digest[x] & 15;
    digest_str[i++] = b + (b > 9 ? 'a' - 10 : '0');
  }
  digest_str[i] = '\0';

  return status;
}

/* FIFO queues (apr-util) */

SWITCH_DECLARE(switch_status_t)
switch_queue_create(switch_queue_t **queue, unsigned int queue_capacity,
                    switch_memory_pool_t *pool) {
  return switch_apr_queue_create(queue, queue_capacity, pool);
}

SWITCH_DECLARE(unsigned int) switch_queue_size(switch_queue_t *queue) {
  return switch_apr_queue_size(queue);
}

SWITCH_DECLARE(switch_status_t)
switch_queue_pop(switch_queue_t *queue, void **data) {
  return switch_apr_queue_pop(queue, data);
}

SWITCH_DECLARE(switch_status_t)
switch_queue_pop_timeout(switch_queue_t *queue, void **data,
                         switch_interval_time_t timeout) {
  return switch_apr_queue_pop_timeout(queue, data, timeout);
}

SWITCH_DECLARE(switch_status_t)
switch_queue_push(switch_queue_t *queue, void *data) {
  fspr_status_t s;

  do {
    s = switch_apr_queue_push(queue, data);
  } while (s == APR_EINTR);

  return s;
}

SWITCH_DECLARE(switch_status_t)
switch_queue_trypop(switch_queue_t *queue, void **data) {
  return switch_apr_queue_trypop(queue, data);
}

SWITCH_DECLARE(switch_status_t)
switch_queue_interrupt_all(switch_queue_t *queue) {
  return switch_apr_queue_interrupt_all(queue);
}

SWITCH_DECLARE(switch_status_t) switch_queue_term(switch_queue_t *queue) {
  return switch_apr_queue_term(queue);
}

SWITCH_DECLARE(switch_status_t)
switch_queue_trypush(switch_queue_t *queue, void *data) {
  fspr_status_t s;

  do {
    s = switch_apr_queue_trypush(queue, data);
  } while (s == APR_EINTR);

  return s;
}

SWITCH_DECLARE(int) switch_vasprintf(char **ret, const char *fmt, va_list ap) {
#ifdef HAVE_VASPRINTF
  return vasprintf(ret, fmt, ap);
#else
  char *buf;
  int len;
  size_t buflen;
  va_list ap2;
  char *tmp = NULL;

#ifdef _MSC_VER
#if _MSC_VER >= 1500
  /* hack for incorrect assumption in msvc header files for code analysis */
  __analysis_assume(tmp);
#endif
  ap2 = ap;
#else
  va_copy(ap2, ap);
#endif

  len = vsnprintf(tmp, 0, fmt, ap2);

  if (len > 0 && (buf = malloc((buflen = (size_t)(len + 1)))) != NULL) {
    len = vsnprintf(buf, buflen, fmt, ap);
    *ret = buf;
  } else {
    *ret = NULL;
    len = -1;
  }

  va_end(ap2);
  return len;
#endif
}

SWITCH_DECLARE(switch_status_t)
switch_match_glob(const char *pattern, switch_array_header_t **result,
                  switch_memory_pool_t *pool) {
  return fspr_match_glob(pattern, (fspr_array_header_t **)result, pool);
}

/**
 * Create an anonymous pipe.
 * @param in The file descriptor to use as input to the pipe.
 * @param out The file descriptor to use as output from the pipe.
 * @param pool The pool to operate on.
 */
SWITCH_DECLARE(switch_status_t)
switch_file_pipe_create(switch_file_t **in, switch_file_t **out,
                        switch_memory_pool_t *pool) {
  return fspr_file_pipe_create((fspr_file_t **)in, (fspr_file_t **)out, pool);
}

/**
 * Get the timeout value for a pipe or manipulate the blocking state.
 * @param thepipe The pipe we are getting a timeout for.
 * @param timeout The current timeout value in microseconds.
 */
SWITCH_DECLARE(switch_status_t)
switch_file_pipe_timeout_get(switch_file_t *thepipe,
                             switch_interval_time_t *timeout) {
  return fspr_file_pipe_timeout_get((fspr_file_t *)thepipe,
                                    (fspr_interval_time_t *)timeout);
}

/**
 * Set the timeout value for a pipe or manipulate the blocking state.
 * @param thepipe The pipe we are setting a timeout on.
 * @param timeout The timeout value in microseconds.  Values < 0 mean wait
 *        forever, 0 means do not wait at all.
 */
SWITCH_DECLARE(switch_status_t)
switch_file_pipe_timeout_set(switch_file_t *thepipe,
                             switch_interval_time_t timeout) {
  return fspr_file_pipe_timeout_set((fspr_file_t *)thepipe,
                                    (fspr_interval_time_t)timeout);
}

/**
 * stop the current thread
 * @param thd The thread to stop
 * @param retval The return value to pass back to any thread that cares
 */
SWITCH_DECLARE(switch_status_t)
switch_thread_exit(switch_thread_t *thd, switch_status_t retval) {
  return fspr_thread_exit((fspr_thread_t *)thd, retval);
}

/**
 * block until the desired thread stops executing.
 * @param retval The return value from the dead thread.
 * @param thd The thread to join
 */
SWITCH_DECLARE(switch_status_t)
switch_thread_join(switch_status_t *retval, switch_thread_t *thd) {
  if (!thd) {
    switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR,
                      "ERROR: Attempting to join thread that does not exist\n");
    return SWITCH_STATUS_FALSE;
  }

  return fspr_thread_join((fspr_status_t *)retval, (fspr_thread_t *)thd);
}

SWITCH_DECLARE(switch_status_t) switch_atomic_init(switch_memory_pool_t *pool) {
  return fspr_atomic_init((fspr_pool_t *)pool);
}

SWITCH_DECLARE(uint32_t) switch_atomic_read(volatile switch_atomic_t *mem) {
#ifdef fspr_atomic_t
  return fspr_atomic_read((fspr_atomic_t *)mem);
#else
  return fspr_atomic_read32((fspr_uint32_t *)mem);
#endif
}

SWITCH_DECLARE(void)
switch_atomic_set(volatile switch_atomic_t *mem, uint32_t val) {
#ifdef fspr_atomic_t
  fspr_atomic_set((fspr_atomic_t *)mem, val);
#else
  fspr_atomic_set32((fspr_uint32_t *)mem, val);
#endif
}

SWITCH_DECLARE(void)
switch_atomic_add(volatile switch_atomic_t *mem, uint32_t val) {
#ifdef fspr_atomic_t
  fspr_atomic_add((fspr_atomic_t *)mem, val);
#else
  fspr_atomic_add32((fspr_uint32_t *)mem, val);
#endif
}

SWITCH_DECLARE(void) switch_atomic_inc(volatile switch_atomic_t *mem) {
#ifdef fspr_atomic_t
  fspr_atomic_inc((fspr_atomic_t *)mem);
#else
  fspr_atomic_inc32((fspr_uint32_t *)mem);
#endif
}

SWITCH_DECLARE(int) switch_atomic_dec(volatile switch_atomic_t *mem) {
#ifdef fspr_atomic_t
  return fspr_atomic_dec((fspr_atomic_t *)mem);
#else
  return fspr_atomic_dec32((fspr_uint32_t *)mem);
#endif
}

SWITCH_DECLARE(char *)
switch_strerror(switch_status_t statcode, char *buf, switch_size_t bufsize) {
  return fspr_strerror(statcode, buf, bufsize);
}

/* For Emacs:
 * Local Variables:
 * mode:c
 * indent-tabs-mode:t
 * tab-width:4
 * c-basic-offset:4
 * End:
 * For VIM:
 * vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
 */