31 lines
731 B
C
31 lines
731 B
C
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/*
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(c) copyright 1989 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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# include "misc.h"
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int
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b64_add(e1,e2)
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register struct _mantissa *e1,*e2;
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{
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int overflow;
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int carry;
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/* add higher pair of 32 bits */
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overflow = ucmp(0xFFFFFFFF - e1->flt_h_32, e2->flt_h_32) < 0;
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e1->flt_h_32 += e2->flt_h_32;
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/* add lower pair of 32 bits */
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carry = ucmp(0xFFFFFFFF - e1->flt_l_32, e2->flt_l_32) < 0;
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e1->flt_l_32 += e2->flt_l_32;
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if ((carry) && ((++e1->flt_h_32 &~0xFFFFFFFF) || e1->flt_h_32 == 0)) {
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e1->flt_h_32 = 0;
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return(1); /* had a 64 bit overflow */
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}
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return(overflow); /* return status from higher add */
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}
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