int64_to_base36

64-bit-wtf.c

char *                                                                          
int64_to_base36(uint32_t src, char *buf)                                        
{                                                                               
    const char base36[] = "0123456789abcdefghijklmnopqrstuvwxyz";               
    int c;                                                                      
                                                                                
    c = 0;                                                                      
    while(src)                                                                  
        {                                                                       
            fprintf(stderr, "%02d: src = 0x%016x (%llu), r = %d\n", c, src, src, src % 36);
            *buf = base36[src % 36];                                            
            buf++;                                                              
            src /= (uint64_t) 36;                                               
            c++;                                                                
        }                                                                       
    *buf = 0;                                                                   
    return buf;                                                                 
}