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/*
* Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 _EVENT_UTIL_INTERNAL_H
#define _EVENT_UTIL_INTERNAL_H

#include "event2/event-config.h"
#include <errno.h>

/* For EVUTIL_ASSERT */
#include "log-internal.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef _EVENT_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include "event2/util.h"

#ifdef __cplusplus
extern "C" {
#endif

/* If we need magic to say "inline", get it for free internally. */
#ifdef _EVENT_inline
#define inline _EVENT_inline
#endif
#ifdef _EVENT___func__
#define __func__ _EVENT___func__
#endif

/* A good no-op to use in macro definitions. */
#define _EVUTIL_NIL_STMT ((void)0)

/* Internal use only: macros to match patterns of error codes in a
cross-platform way. We need these macros because of two historical
reasons: first, nonblocking IO functions are generally written to give an
error on the "blocked now, try later" case, so sometimes an error from a
read, write, connect, or accept means "no error; just wait for more
data," and we need to look at the error code. Second, Windows defines
a different set of error codes for sockets. */

#ifndef WIN32

/* True iff e is an error that means a read/write operation can be retried. */
#define EVUTIL_ERR_RW_RETRIABLE(e) \
((e) == EINTR || (e) == EAGAIN)
/* True iff e is an error that means an connect can be retried. */
#define EVUTIL_ERR_CONNECT_RETRIABLE(e) \
((e) == EINTR || (e) == EINPROGRESS)
/* True iff e is an error that means a accept can be retried. */
#define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \
((e) == EINTR || (e) == EAGAIN || (e) == ECONNABORTED)

/* True iff e is an error that means the connection was refused */
#define EVUTIL_ERR_CONNECT_REFUSED(e) \
((e) == ECONNREFUSED)

#else

#define EVUTIL_ERR_RW_RETRIABLE(e) \
((e) == WSAEWOULDBLOCK || \
(e) == WSAEINTR)

#define EVUTIL_ERR_CONNECT_RETRIABLE(e) \
((e) == WSAEWOULDBLOCK || \
(e) == WSAEINTR || \
(e) == WSAEINPROGRESS || \
(e) == WSAEINVAL)

#define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \
EVUTIL_ERR_RW_RETRIABLE(e)

#define EVUTIL_ERR_CONNECT_REFUSED(e) \
((e) == WSAECONNREFUSED)

#endif

#ifdef _EVENT_socklen_t
#define socklen_t _EVENT_socklen_t
#endif

/* Locale-independent replacements for some ctypes functions. Use these
* when you care about ASCII's notion of character types, because you are about
* to send those types onto the wire.
*/
#define DECLARE_CTYPE_FN(name) \
static int EVUTIL_##name(char c); \
extern const ev_uint32_t EVUTIL_##name##_TABLE[]; \
static inline int EVUTIL_##name(char c) { \
ev_uint8_t u = c; \
return !!(EVUTIL_##name##_TABLE[(u >> 5) & 7] & (1 << (u & 31))); \
}
DECLARE_CTYPE_FN(ISALPHA)
DECLARE_CTYPE_FN(ISALNUM)
DECLARE_CTYPE_FN(ISSPACE)
DECLARE_CTYPE_FN(ISDIGIT)
DECLARE_CTYPE_FN(ISXDIGIT)
DECLARE_CTYPE_FN(ISPRINT)
DECLARE_CTYPE_FN(ISLOWER)
DECLARE_CTYPE_FN(ISUPPER)
extern const unsigned char EVUTIL_TOUPPER_TABLE[];
extern const unsigned char EVUTIL_TOLOWER_TABLE[];
#define EVUTIL_TOLOWER(c) ((char)EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c])
#define EVUTIL_TOUPPER(c) ((char)EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c])

/** Helper macro. If we know that a given pointer points to a field in a
structure, return a pointer to the structure itself. Used to implement
our half-baked C OO. Example:

struct subtype {
int x;
struct supertype common;
int y;
};
...
void fn(struct supertype *super) {
struct subtype *sub = EVUTIL_UPCAST(super, struct subtype, common);
...
}
*/
#define EVUTIL_UPCAST(ptr, type, field) \
((type *)(((char*)(ptr)) - evutil_offsetof(type, field)))

int evutil_read_file(const char *filename, char **content_out, size_t *len_out,
    int is_binary);

int evutil_socket_connect(evutil_socket_t *fd_ptr, struct sockaddr *sa, int socklen);

int evutil_socket_finished_connecting(evutil_socket_t fd);

int evutil_ersatz_socketpair(int, int , int, evutil_socket_t[]);

int evutil_resolve(int family, const char *hostname, struct sockaddr *sa,
    ev_socklen_t *socklen, int port);

const char *evutil_getenv(const char *name);

long _evutil_weakrand(void);

/* Evaluates to the same boolean value as 'p', and hints to the compiler that
* we expect this value to be false. */
#ifdef __GNUC__
#define EVUTIL_UNLIKELY(p) __builtin_expect(!!(p),0)
#else
#define EVUTIL_UNLIKELY(p) (p)
#endif

/* Replacement for assert() that calls event_errx on failure. */
#define EVUTIL_ASSERT(cond) \
do { \
if (EVUTIL_UNLIKELY(!(cond))) { \
event_errx(_EVENT_ERR_ABORT, \
"%s:%d: Assertion %s failed in %s", \
__FILE__,__LINE__,#cond,__func__); \
/* In case a user-supplied handler tries to */ \
/* return control to us, log and abort here. */ \
(void)fprintf(stderr, \
"%s:%d: Assertion %s failed in %s", \
__FILE__,__LINE__,#cond,__func__); \
abort(); \
} \
} while (0)

/* Internal addrinfo error code. This one is returned from only from
* evutil_getaddrinfo_common, when we are sure that we'll have to hit a DNS
* server. */
#define EVUTIL_EAI_NEED_RESOLVE -90002

struct evdns_base;
struct evdns_getaddrinfo_request;
typedef struct evdns_getaddrinfo_request* (*evdns_getaddrinfo_fn)(
    struct evdns_base *base,
    const char *nodename, const char *servname,
    const struct evutil_addrinfo *hints_in,
    void (*cb)(int, struct evutil_addrinfo *, void *), void *arg);

void evutil_set_evdns_getaddrinfo_fn(evdns_getaddrinfo_fn fn);

struct evutil_addrinfo *evutil_new_addrinfo(struct sockaddr *sa,
    ev_socklen_t socklen, const struct evutil_addrinfo *hints);
struct evutil_addrinfo *evutil_addrinfo_append(struct evutil_addrinfo *first,
    struct evutil_addrinfo *append);
void evutil_adjust_hints_for_addrconfig(struct evutil_addrinfo *hints);
int evutil_getaddrinfo_common(const char *nodename, const char *servname,
    struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum);

int evutil_getaddrinfo_async(struct evdns_base *dns_base,
    const char *nodename, const char *servname,
    const struct evutil_addrinfo *hints_in,
    void (*cb)(int, struct evutil_addrinfo *, void *), void *arg);

/** Return true iff sa is a looback address. (That is, it is 127.0.0.1/8, or
* ::1). */
int evutil_sockaddr_is_loopback(const struct sockaddr *sa);


/**
Formats a sockaddr sa into a string buffer of size outlen stored in out.
Returns a pointer to out. Always writes something into out, so it's safe
to use the output of this function without checking it for NULL.
*/
const char *evutil_format_sockaddr_port(const struct sockaddr *sa, char *out, size_t outlen);

long evutil_tv_to_msec(const struct timeval *tv);

int evutil_hex_char_to_int(char c);

#ifdef __cplusplus
}
#endif

#endif
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