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Annotation of 40BSD/cmd/uucp/chksum.c, revision 1.1.1.1

1.1       root        1: main()
                      2: {
                      3:        int i, j;
                      4:        char buf[300];
                      5: 
                      6:        for (i = 0; i < 300; i++)
                      7:                buf[i] = i;
                      8:        printf("%o\n", chksum(buf, 300));
                      9: }
                     10: 
                     11: chksum(s,n)
                     12: register char *s;
                     13: register n;
                     14: {
                     15:        register short sum;
                     16:        register unsigned t;
                     17:        register x;
                     18: 
                     19:        sum = -1;
                     20:        x = 0;
                     21: 
                     22:        do {
                     23:                if (sum<0) {
                     24:                        sum <<= 1;
                     25:                        sum++;
                     26:                } else
                     27:                        sum <<= 1;
                     28:                t = sum;
                     29:                sum += (unsigned)*s++;
                     30:                x += sum^n;
                     31:                if ((unsigned)sum <= t) {
                     32:                        sum ^= x;
                     33:                }
                     34:        } while (--n > 0);
                     35: 
                     36:        return(sum);
                     37: }

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