Hello All,
I've been missing the lack of support for binary numeric literals in C. To get around it I wrote the following handy macros, which allows you to simply write something like:
whatever = B8(10101010);
and will translate as:
whatever = 85;
(compile-time constant)
Code below... hopefully it's useful to some of you as well.
greetings, Tom
/* Binary constant generator macro By Tom Torfs - donated to the public domain
*/
/* All macro's evaluate to compile-time constants */
/* *** helper macros *** /
/* turn a numeric literal into a hex constant (avoids problems with leading zeroes) 8-bit constants max value 0x11111111, always fits in unsigned long
*/ #define HEX__(n) 0x##n##LU
/* 8-bit conversion function */ #define B8__(x) ((x&0x0000000FLU)?1:0) \ +((x&0x000000F0LU)?2:0) \ +((x&0x00000F00LU)?4:0) \ +((x&0x0000F000LU)?8:0) \ +((x&0x000F0000LU)?16:0) \ +((x&0x00F00000LU)?32:0) \ +((x&0x0F000000LU)?64:0) \ +((x&0xF0000000LU)?128:0)
/* *** user macros *** /
/* for upto 8-bit binary constants */ #define B8(d) ((unsigned char)B8__(HEX__(d)))
/* for upto 16-bit binary constants, MSB first */ #define B16(dmsb,dlsb) (((unsigned short)B8(dmsb)