core: Avoid Floating point exception dividing negative numbers.
This fixes kaem --verbose --strict bin/mes-m2 -c '(display (modulo -1 -1))' * src/math.c (modulo): Use unsigned division.
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src/math.c
28
src/math.c
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@ -188,16 +188,26 @@ modulo (struct scm *a, struct scm *b)
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{
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{
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assert_number ("modulo", a);
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assert_number ("modulo", a);
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assert_number ("modulo", b);
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assert_number ("modulo", b);
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long x = a->value;
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long n = a->value;
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long y = b->value;
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long v = b->value;
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if (y == 0)
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if (v == 0)
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error (cstring_to_symbol ("divide-by-zero"), a);
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error (cstring_to_symbol ("divide-by-zero"), a);
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while (x < 0)
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int sign_p = 0;
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x = x + y;
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size_t w = v;
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if (x != 0)
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if (v < 0)
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x = x % y;
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{
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sign_p = 1;
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return make_number (x);
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w = -v;
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}
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while (n < 0)
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n = n + w;
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size_t u = n;
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if (u != 0)
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u = u % w;
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n = u;
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if (sign_p)
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n = -n;
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return make_number (n);
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}
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}
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struct scm *
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struct scm *
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