39 lines
1 KiB
C
39 lines
1 KiB
C
/* Binary constant generator macro
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By Tom Torfs - donated to the public domain
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*/
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/* All macro's evaluate to compile-time constants */
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/* *** helper macros *** /
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/* turn a numeric literal into a hex constant
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(avoids problems with leading zeroes)
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8-bit constants max value 0x11111111, always fits in unsigned long
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*/
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#define HEX__(n) 0x##n##LU
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/* 8-bit conversion function */
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#define B8__(x) ((x&0x0000000FLU)?1:0) \
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+((x&0x000000F0LU)?2:0) \
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+((x&0x00000F00LU)?4:0) \
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+((x&0x0000F000LU)?8:0) \
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+((x&0x000F0000LU)?16:0) \
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+((x&0x00F00000LU)?32:0) \
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+((x&0x0F000000LU)?64:0) \
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+((x&0xF0000000LU)?128:0)
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/* *** user macros *** /
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/* for upto 8-bit binary constants */
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#define B8(d) ((unsigned char)B8__(HEX__(d)))
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/* for upto 16-bit binary constants, MSB first */
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#define B16(dmsb,dlsb) (((unsigned short)B8(dmsb)<<8) \
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+ B8(dlsb))
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/* for upto 32-bit binary constants, MSB first */
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#define B32(dmsb,db2,db3,dlsb) (((unsigned long)B8(dmsb)<<24) \
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+ ((unsigned long)B8(db2)<<16) \
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+ ((unsigned long)B8(db3)<<8) \
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+ B8(dlsb))
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