lrc_calc.c

#include "unistd.h"
#include "stdio.h"

/* Reads one line of data and produces the LRC of all the bytes read. */
int main ( int argc, char* argv[] )
{
    char buf[1];
    int n, lrc = 0;
    while ( n = read(0, buf, 1) > 0 ) /* read one byte from std::in */
    {
        if ( buf[0] == '\n' )
            break;
        lrc ^= buf[0];
    }
    printf("LRC = %02X\n", lrc);

    return 0;
}