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127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
/*
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* Copyright (c) 2007-2009 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _EVENT_UTIL_INTERNAL_H
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#define _EVENT_UTIL_INTERNAL_H
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#include "event-config.h"
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#include <errno.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* A good no-op to use in macro definitions. */
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#define _EVUTIL_NIL_STMT ((void)0)
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/* Internal use only: macros to match patterns of error codes in a
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cross-platform way. We need these macros because of two historical
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reasons: first, nonblocking IO functions are generally written to give an
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error on the "blocked now, try later" case, so sometimes an error from a
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read, write, connect, or accept means "no error; just wait for more
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data," and we need to look at the error code. Second, Windows defines
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a different set of error codes for sockets. */
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#ifndef WIN32
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/* True iff e is an error that means a read/write operation can be retried. */
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#define EVUTIL_ERR_RW_RETRIABLE(e) \
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((e) == EINTR || (e) == EAGAIN)
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/* True iff e is an error that means an accept can be retried. */
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#define EVUTIL_ERR_CONNECT_RETRIABLE(e) \
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((e) == EINTR || (e) == EINPROGRESS)
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/* True iff e is an error that means a connect can be retried. */
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#define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \
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((e) == EINTR || (e) == EAGAIN || (e) == ECONNABORTED)
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#else
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#define EVUTIL_ERR_RW_RETRIABLE(e) \
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((e) == WSAEWOULDBLOCK || \
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(e) == WSAEINTR)
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#define EVUTIL_ERR_CONNECT_RETRIABLE(e) \
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((e) == WSAEWOULDBLOCK || \
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(e) == WSAEINTR || \
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(e) == WSAEINPROGRESS || \
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(e) == WSAEINVAL)
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#define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \
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EVUTIL_ERR_RW_RETRIABLE(e)
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#endif
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#ifdef _EVENT_socklen_t
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#define socklen_t _EVENT_socklen_t
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#endif
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/* Locale-independent replacements for some ctypes functions. Use these
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* when you care about ASCII's notion of character types, because you are about
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* to send those types onto the wire.
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*/
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#define DECLARE_CTYPE_FN(name) \
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static int EVUTIL_##name(char c); \
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extern const ev_uint32_t EVUTIL_##name##_TABLE[]; \
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static inline int EVUTIL_##name(char c) { \
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ev_uint8_t u = c; \
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return !!(EVUTIL_##name##_TABLE[(u >> 5) & 7] & (1 << (u & 31))); \
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}
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DECLARE_CTYPE_FN(ISALPHA)
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DECLARE_CTYPE_FN(ISALNUM)
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DECLARE_CTYPE_FN(ISSPACE)
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DECLARE_CTYPE_FN(ISDIGIT)
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DECLARE_CTYPE_FN(ISXDIGIT)
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DECLARE_CTYPE_FN(ISPRINT)
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DECLARE_CTYPE_FN(ISLOWER)
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DECLARE_CTYPE_FN(ISUPPER)
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extern const char EVUTIL_TOUPPER_TABLE[];
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extern const char EVUTIL_TOLOWER_TABLE[];
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#define EVUTIL_TOLOWER(c) (EVUTIL_TOLOWER_TABLE[(ev_uint8_t)c])
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#define EVUTIL_TOUPPER(c) (EVUTIL_TOUPPER_TABLE[(ev_uint8_t)c])
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/** Helper macro. If we know that a given pointer points to a field in a
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structure, return a pointer to the structure itself. Used to implement
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our half-baked C OO. Example:
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struct subtype {
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int x;
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struct supertype common;
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int y;
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};
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...
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void fn(struct supertype *super) {
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struct subtype *sub = EVUTIL_UPCAST(super, struct subtype, common);
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...
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}
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*/
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#define EVUTIL_UPCAST(ptr, type, field) \
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((type *)((char*)ptr) - evutil_offsetof(type, field))
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#ifdef __cplusplus
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}
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#endif
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#endif
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