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Unfortunately old versions of GCC and clang do not provide byte order macros, so we re-invent them. If UTIL_BYTE_ORDER is not defined or defined to 0, we fall back to macros supported by recent versions of GCC and clang
38 lines
1 KiB
C
38 lines
1 KiB
C
/* this file mimics the macros present in recent GCC and CLANG */
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#ifndef _ENDIAN_UTIL_H
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#define _ENDIAN_UTIL_H
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/* This are prefixed with UTIL to avoid collisions
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*
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* You can use something like the following to define UTIL_BYTE_ORDER
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* in a configure script.
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*/
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#if 0
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#include <stdio.h>
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#include <stdint.h>
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uint32_t test = 0x34333231;
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int main() { printf("%.4s\n", (const char*)&test); return 0; }
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#endif
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#define UTIL_ORDER_BIG_ENDIAN 4321
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#define UTIL_ORDER_LITTLE_ENDIAN 1234
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#if !defined(UTIL_BYTE_ORDER) || ((UTIL_BYTE_ORDER != UTIL_ORDER_BIG_ENDIAN) && \
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(UTIL_BYTE_ORDER != UTIL_ORDER_LITTLE_ENDIAN))
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#undef UTIL_BYTE_ORDER
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#ifdef __BYTE_ORDER__
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# if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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# define UTIL_BYTE_ORDER UTIL_ORDER_LITTLE_ENDIAN
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# elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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# define UTIL_BYTE_ORDER UTIL_ORDER_BIG_ENDIAN
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# else
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# error "Unsupported __BYTE_ORDER__"
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# endif
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#else
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# error "UTIL_BYTE_ORDER not correctly defined and __BYTE_ORDER__ not defined."
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#endif
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#endif
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#endif
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