| 1 | /* |
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| 2 | * libcucul Canvas for ultrafast compositing of Unicode letters |
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| 3 | * libcaca Colour ASCII-Art library |
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| 4 | * Copyright (c) 2006 Sam Hocevar <sam@zoy.org> |
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| 5 | * All Rights Reserved |
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| 6 | * |
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| 7 | * $Id: stubs.h 2398 2008-06-15 12:28:14Z sam $ |
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| 8 | * |
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| 9 | * This library is free software; you can redistribute it and/or |
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| 10 | * modify it under the terms of the Do What The Fuck You Want To |
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| 11 | * Public License, Version 2, as published by Sam Hocevar. See |
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| 12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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| 13 | */ |
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| 14 | |
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| 15 | /* |
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| 16 | * This file contains replacements for commonly found object types and |
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| 17 | * function prototypes that are sometimes missing. |
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| 18 | */ |
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| 19 | |
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| 20 | #ifndef __STUBS_H__ |
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| 21 | #define __STUBS_H__ |
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| 22 | |
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| 23 | /* errno handling */ |
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| 24 | #if defined HAVE_ERRNO_H && !defined __KERNEL__ |
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| 25 | # include <errno.h> |
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| 26 | static inline void seterrno(int e) { errno = e; } |
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| 27 | static inline int geterrno(void) { return errno; } |
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| 28 | #else |
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| 29 | # define seterrno(x) do { (void)(x); } while(0) |
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| 30 | # define geterrno(x) 0 |
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| 31 | #endif |
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| 32 | |
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| 33 | /* debug messages */ |
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| 34 | #if defined DEBUG && !defined __KERNEL__ |
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| 35 | # include <stdio.h> |
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| 36 | # include <stdarg.h> |
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| 37 | static inline void debug(const char *format, ...) |
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| 38 | { |
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| 39 | int saved_errno = geterrno(); |
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| 40 | va_list args; |
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| 41 | va_start(args, format); |
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| 42 | fprintf(stderr, "** libcaca debug ** "); |
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| 43 | vfprintf(stderr, format, args); |
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| 44 | fprintf(stderr, "\n"); |
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| 45 | va_end(args); |
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| 46 | seterrno(saved_errno); |
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| 47 | } |
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| 48 | #else |
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| 49 | # define debug(format, ...) do {} while(0) |
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| 50 | #endif |
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| 51 | |
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| 52 | /* hton16() and hton32() */ |
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| 53 | #if defined HAVE_HTONS && !defined __KERNEL__ |
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| 54 | # if defined HAVE_ARPA_INET_H |
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| 55 | # include <arpa/inet.h> |
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| 56 | # elif defined HAVE_NETINET_IN_H |
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| 57 | # include <netinet/in.h> |
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| 58 | # endif |
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| 59 | # define hton16 htons |
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| 60 | # define hton32 htonl |
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| 61 | #else |
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| 62 | # if defined __KERNEL__ |
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| 63 | /* Nothing to do */ |
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| 64 | # elif defined HAVE_ENDIAN_H |
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| 65 | # include <endian.h> |
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| 66 | # endif |
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| 67 | static inline uint16_t hton16(uint16_t x) |
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| 68 | { |
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| 69 | /* This is compile-time optimised with at least -O1 or -Os */ |
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| 70 | #if defined HAVE_ENDIAN_H |
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| 71 | if(__BYTE_ORDER == __BIG_ENDIAN) |
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| 72 | #else |
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| 73 | uint32_t const dummy = 0x12345678; |
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| 74 | if(*(uint8_t const *)&dummy == 0x12) |
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| 75 | #endif |
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| 76 | return x; |
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| 77 | else |
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| 78 | return (x >> 8) | (x << 8); |
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| 79 | } |
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| 80 | |
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| 81 | static inline uint32_t hton32(uint32_t x) |
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| 82 | { |
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| 83 | /* This is compile-time optimised with at least -O1 or -Os */ |
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| 84 | #if defined HAVE_ENDIAN_H |
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| 85 | if(__BYTE_ORDER == __BIG_ENDIAN) |
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| 86 | #else |
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| 87 | uint32_t const dummy = 0x12345678; |
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| 88 | if(*(uint8_t const *)&dummy == 0x12) |
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| 89 | #endif |
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| 90 | return x; |
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| 91 | else |
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| 92 | return (x >> 24) | ((x >> 8) & 0x0000ff00) |
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| 93 | | ((x << 8) & 0x00ff0000) | (x << 24); |
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| 94 | } |
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| 95 | #endif |
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| 96 | |
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| 97 | #endif /* __STUBS_H__ */ |
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| 98 | |
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