source: libcaca/trunk/common.h @ 2056

Last change on this file since 2056 was 1416, checked in by Sam Hocevar, 13 years ago
  • Fix a compilation warning by pretending to use seterrno()'s argument even when it isn't.
  • Property svn:keywords set to Id
File size: 2.7 KB
RevLine 
[858]1/*
2 *  libcucul      Canvas for ultrafast compositing of Unicode letters
3 *  libcaca       Colour ASCII-Art library
4 *  Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
5 *                All Rights Reserved
6 *
7 *  $Id: common.h 1416 2006-11-16 11:26:22Z sam $
8 *
9 *  This library is free software; you can redistribute it and/or
10 *  modify it under the terms of the Do What The Fuck You Want To
11 *  Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15/*
16 *  This file contains replacements for commonly found object types and
17 *  function prototypes that are sometimes missing.
18 */
19
[1362]20/* C99 types */
[1304]21#if defined HAVE_INTTYPES_H && !defined __KERNEL__
[863]22#   include <inttypes.h>
23#else
[858]24typedef signed char int8_t;
25typedef signed short int16_t;
26typedef signed long int int32_t;
[859]27
[858]28typedef unsigned char uint8_t;
29typedef unsigned short uint16_t;
30typedef unsigned long int uint32_t;
[859]31
32typedef long int intptr_t;
33typedef unsigned long int uintptr_t;
[858]34#endif
35
[1362]36/* errno handling */
37#if defined HAVE_ERRNO_H && !defined __KERNEL__
38#   include <errno.h>
39static inline void seterrno(int e) { errno = e; }
40static inline int geterrno(void) { return errno; }
41#else
[1416]42#   define seterrno(x) do { (void)(x); } while(0)
[1362]43#   define geterrno(x) 0
44#endif
45
46/* debug messages */
[1360]47#if defined DEBUG && !defined __KERNEL__
48#   include <stdio.h>
49#   include <stdarg.h>
50static inline void debug(const char *format, ...)
51{
[1362]52    int saved_errno = geterrno();
[1360]53    va_list args;
54    va_start(args, format);
55    fprintf(stderr, "** libcaca debug ** ");
56    vfprintf(stderr, format, args);
57    fprintf(stderr, "\n");
58    va_end(args);
[1362]59    seterrno(saved_errno);
[1360]60}
61#else
62#   define debug(format, ...) do {} while(0)
63#endif
64
[1362]65/* hton16() and hton32() */
[1304]66#if defined HAVE_HTONS
67#   if defined __KERNEL__
68        /* Nothing to do */
69#   elif defined HAVE_ARPA_INET_H
[1303]70#       include <arpa/inet.h>
[1304]71#   elif defined HAVE_NETINET_IN_H
[1303]72#       include <netinet/in.h>
73#   endif
[865]74#   define hton16 htons
75#   define hton32 htonl
76#else
[1304]77#   if defined HAVE_ENDIAN_H
[861]78#       include <endian.h>
79#   endif
[865]80static inline uint16_t hton16(uint16_t x)
[861]81{
[865]82    /* This is compile-time optimised with at least -O1 or -Os */
[1304]83#if defined HAVE_ENDIAN_H
[861]84    if(__BYTE_ORDER == __BIG_ENDIAN)
85#else
86    uint32_t const dummy = 0x12345678;
87    if(*(uint8_t const *)&dummy == 0x12)
88#endif
89        return x;
90    else
91        return (x >> 8) | (x << 8);
92}
93
[865]94static inline uint32_t hton32(uint32_t x)
[861]95{
[865]96    /* This is compile-time optimised with at least -O1 or -Os */
[1304]97#if defined HAVE_ENDIAN_H
[861]98    if(__BYTE_ORDER == __BIG_ENDIAN)
99#else
100    uint32_t const dummy = 0x12345678;
101    if(*(uint8_t const *)&dummy == 0x12)
102#endif
103        return x;
104    else
105        return (x >> 24) | ((x >> 8) & 0x0000ff00)
106                | ((x << 8) & 0x00ff0000) | (x << 24);
107}
108#endif
109
Note: See TracBrowser for help on using the repository browser.