78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
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* libcaca Colour ASCII-Art library
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* Copyright (c) 2006-2012 Sam Hocevar <sam@hocevar.net>
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* All Rights Reserved
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*
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* This library is free software. It comes without any warranty, to
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* the extent permitted by applicable law. You can redistribute it
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* and/or modify it under the terms of the Do What the Fuck You Want
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* to Public License, Version 2, as published by Sam Hocevar. See
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* http://www.wtfpl.net/ for more details.
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*/
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/*
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* This file contains replacements for commonly found object types and
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* function prototypes that are sometimes missing.
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*/
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#ifndef __CACA_STUBS_H__
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#define __CACA_STUBS_H__
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/* errno handling */
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#if defined HAVE_ERRNO_H && !defined __KERNEL__
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# include <errno.h>
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static inline void seterrno(int e) { errno = e; }
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static inline int geterrno(void) { return errno; }
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#else
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# define seterrno(x) do { (void)(x); } while(0)
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# define geterrno(x) 0
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#endif
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/* hton16() and hton32() */
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#if defined HAVE_HTONS && !defined __KERNEL__
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# if defined HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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# elif defined HAVE_NETINET_IN_H
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# include <netinet/in.h>
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# endif
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# define hton16 htons
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# define hton32 htonl
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#else
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# if defined __KERNEL__
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/* Nothing to do */
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# elif defined HAVE_ENDIAN_H
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# include <endian.h>
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# endif
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static inline uint16_t hton16(uint16_t x)
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{
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/* This is compile-time optimised with at least -O1 or -Os */
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#if defined HAVE_ENDIAN_H
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if(__BYTE_ORDER == __BIG_ENDIAN)
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#else
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uint32_t const dummy = 0x12345678;
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if(*(uint8_t const *)&dummy == 0x12)
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#endif
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return x;
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else
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return (x >> 8) | (x << 8);
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}
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static inline uint32_t hton32(uint32_t x)
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{
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/* This is compile-time optimised with at least -O1 or -Os */
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#if defined HAVE_ENDIAN_H
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if(__BYTE_ORDER == __BIG_ENDIAN)
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#else
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uint32_t const dummy = 0x12345678;
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if(*(uint8_t const *)&dummy == 0x12)
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#endif
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return x;
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else
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return (x >> 24) | ((x >> 8) & 0x0000ff00)
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| ((x << 8) & 0x00ff0000) | (x << 24);
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}
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#endif
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#endif /* __CACA_STUBS_H__ */
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