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Length: 727 (0x2d7)
Types: TextFile
Notes: UNIX file
Names: »mneg.c«
└─⟦f27320a65⟧ Bits:30001972 Commodore 900 hard disk image with partial source code
└─⟦f4b8d8c84⟧ UNIX V7 Filesystem
└─ ⟦this⟧ »libmp/mneg.c«
#include "mprec.h"
#include <assert.h>
/*
* Mneg sets the mint pointed to by "b" to negative 1 times the
* mint pointed to by "a". Note that "a" == "b" is permissable.
*/
void
mneg(a, b)
mint *a, *b;
{
register char *ap, *rp;
register unsigned count;
mint res;
int mifl;
/* allocate result space */
mifl = ispos(a);
res.len = a->len;
if (mifl)
++res.len;
res.val = (char *)mpalc(res.len);
/* negate and copy */
ap = a->val;
rp = res.val;
count = a->len;
while (count-- > 0)
*rp++ = NEFL - *ap++;
if (mifl)
*rp = NEFL;
++*res.val;
assert(ap == a->val + a->len);
assert(rp == res.val + res.len - (mifl ? 1 : 0));
norm(&res);
/* replace old value of b with res */
mpfree(b->val);
*b = res;
}