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27 From: david@tethera.net
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28 To: notmuch@notmuchmail.org
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29 Subject: [PATCH v2] util: detect byte order
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30 Date: Tue, 26 Nov 2013 20:38:14 -0400
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31 Message-Id: <1385512694-32526-1-git-send-email-david@tethera.net>
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33 In-Reply-To: <m2txezqcuf.fsf@guru.guru-group.fi>
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34 References: <m2txezqcuf.fsf@guru.guru-group.fi>
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49 From: David Bremner <david@tethera.net>
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51 Unfortunately old versions of GCC and clang do not provide byte order
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52 macros, so we re-invent them.
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54 If UTIL_BYTE_ORDER is not defined or defined to 0, we fall back to
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55 macros supported by recent versions of GCC and clang
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58 I think I got all of Tomi's comments, including the most serious one
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59 about the test in endian-utils.h (LITTLE twice instead of BIG,
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62 configure | 24 ++++++++++++++++++++++--
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63 lib/libsha1.c | 21 +++++++--------------
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64 util/endian-util.h | 38 ++++++++++++++++++++++++++++++++++++++
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65 3 files changed, 67 insertions(+), 16 deletions(-)
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66 create mode 100644 util/endian-util.h
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68 diff --git a/configure b/configure
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69 index 1a8e939..a0c6771 100755
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72 @@ -441,6 +441,19 @@ else
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76 +printf "Checking byte order... "
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77 +cat> _byteorder.c <<EOF
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79 +#include <stdint.h>
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80 +uint32_t test = 0x34333231;
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81 +int main() { printf("%.4s\n", (const char*)&test); return 0; }
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83 +${CC} ${CFLAGS} _byteorder.c -o _byteorder > /dev/null 2>&1
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84 +util_byte_order=$(./_byteorder)
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85 +echo $util_byte_order
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87 +#rm -f _byteorder _byteorder.c
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89 if [ $errors -gt 0 ]; then
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92 @@ -702,6 +715,9 @@ prefix = ${PREFIX}
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93 # LIBDIR_IN_LDCONFIG value below is still set correctly.
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94 libdir = ${LIBDIR:=\$(prefix)/lib}
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96 +# byte order within a 32 bit word. 1234 = little, 4321 = big, 0 = guess
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97 +UTIL_BYTE_ORDER = ${util_byte_order}
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99 # Whether libdir is in a path configured into ldconfig
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100 LIBDIR_IN_LDCONFIG = ${libdir_in_ldconfig}
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102 @@ -807,7 +823,9 @@ CONFIGURE_CFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\
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103 -DHAVE_STRSEP=\$(HAVE_STRSEP) \\
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104 -DSTD_GETPWUID=\$(STD_GETPWUID) \\
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105 -DSTD_ASCTIME=\$(STD_ASCTIME) \\
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106 - -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)
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107 + -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT) \\
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108 + -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)
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110 CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\
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111 \$(TALLOC_CFLAGS) -DHAVE_VALGRIND=\$(HAVE_VALGRIND) \\
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112 \$(VALGRIND_CFLAGS) \$(XAPIAN_CXXFLAGS) \\
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113 @@ -815,6 +833,8 @@ CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\
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114 -DHAVE_STRSEP=\$(HAVE_STRSEP) \\
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115 -DSTD_GETPWUID=\$(STD_GETPWUID) \\
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116 -DSTD_ASCTIME=\$(STD_ASCTIME) \\
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117 - -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)
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118 + -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT) \\
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119 + -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)
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121 CONFIGURE_LDFLAGS = \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(XAPIAN_LDFLAGS)
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123 diff --git a/lib/libsha1.c b/lib/libsha1.c
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124 index 87c7c52..aaaa4eb 100644
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125 --- a/lib/libsha1.c
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126 +++ b/lib/libsha1.c
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130 #include <string.h> /* for memcpy() etc. */
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132 +#include "endian-util.h"
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133 #include "libsha1.h"
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135 #if defined(__cplusplus)
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136 @@ -49,20 +49,13 @@ extern "C"
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138 #define bswap_32(x) ((rotr32((x), 24) & 0x00ff00ff) | (rotr32((x), 8) & 0xff00ff00))
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140 -/* The macros __BYTE_ORDER__ and __ORDER_*_ENDIAN__ are GNU C
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141 - * extensions. They are also supported by clang as of v3.2 */
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143 -#ifdef __BYTE_ORDER__
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144 -# if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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145 -# define bsw_32(p,n) \
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146 - { int _i = (n); while(_i--) ((uint32_t*)p)[_i] = bswap_32(((uint32_t*)p)[_i]); }
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147 -# elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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148 -# define bsw_32(p,n)
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150 -# error "unknown byte order"
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152 +#if (UTIL_BYTE_ORDER == UTIL_ORDER_LITTLE_ENDIAN)
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153 +# define bsw_32(p,n) \
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154 + { int _i = (n); while(_i--) ((uint32_t*)p)[_i] = bswap_32(((uint32_t*)p)[_i]); }
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155 +#elif (UTIL_BYTE_ORDER == UTIL_ORDER_BIG_ENDIAN)
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156 +# define bsw_32(p,n)
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158 -# error "macro __BYTE_ORDER__ is not defined"
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159 +# error "Unsupported byte order"
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162 #define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
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163 diff --git a/util/endian-util.h b/util/endian-util.h
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164 new file mode 100644
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165 index 0000000..bc80c40
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167 +++ b/util/endian-util.h
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169 +/* this file mimics the macros present in recent GCC and CLANG */
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171 +#ifndef _ENDIAN_UTIL_H
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172 +#define _ENDIAN_UTIL_H
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174 +/* This are prefixed with UTIL to avoid collisions
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176 + * You can use something like the following to define UTIL_BYTE_ORDER
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177 + * in a configure script.
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180 +#include <stdio.h>
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181 +#include <stdint.h>
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182 +uint32_t test = 0x34333231;
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183 +int main() { printf("%.4s\n", (const char*)&test); return 0; }
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186 +#define UTIL_ORDER_BIG_ENDIAN 4321
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187 +#define UTIL_ORDER_LITTLE_ENDIAN 1234
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190 +#if !defined(UTIL_BYTE_ORDER) || ((UTIL_BYTE_ORDER != UTIL_ORDER_BIG_ENDIAN) && \
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191 + (UTIL_BYTE_ORDER != UTIL_ORDER_LITTLE_ENDIAN))
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192 +#undef UTIL_BYTE_ORDER
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193 +#ifdef __BYTE_ORDER__
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194 +# if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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195 +# define UTIL_BYTE_ORDER UTIL_ORDER_LITTLE_ENDIAN
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196 +# elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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197 +# define UTIL_BYTE_ORDER UTIL_ORDER_BIG_ENDIAN
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199 +# error "Unsupported __BYTE_ORDER__"
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202 +# error "UTIL_BYTE_ORDER not correctly defined and __BYTE_ORDER__ not defined."
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