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Annotation of researchv10no/cmd/sum/sumr.c, revision 1.1.1.1

1.1       root        1: #define                BSIZE           1024            /* research! */
                      2: 
                      3: int
                      4: sumr(register long sum, char *buf, int n)
                      5: {
                      6:        register unsigned char *s, *send;
                      7: 
                      8:        if(buf == 0){
                      9:                sum &= 0xFFFF;
                     10:                printf("%05u%6ld", sum, (n + (BSIZE - 1)) / BSIZE);
                     11:                return(0);
                     12:        }
                     13:        for(s = (unsigned char *)buf, send = s+n; s < send; s++)
                     14:                if (sum & 1)
                     15:                        sum = 0xffff & ((sum>>1) + *s + 0x8000);
                     16:                else
                     17:                        sum = 0xffff & ((sum>>1) + *s);
                     18:        return(sum);
                     19: }

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