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Make binomial_subs.c OK on 32-bit machines.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6217 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor 2015-12-02 16:13:44 +00:00
parent 5606d8a3aa
commit 036d408908
1 changed files with 8 additions and 8 deletions
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16
lib/sfrsd2/sfrsd_paper/binomial_subs.c
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@ -7,8 +7,8 @@
/* We go to some effort to handle overflow situations */
static unsigned long gcd_ui(unsigned long x, unsigned long y) {
unsigned long t;
static unsigned long long gcd_ui(unsigned long long x, unsigned long long y) {
unsigned long long t;
if (y < x) { t = x; x = y; y = t; }
while (y > 0) {
t = y; y = x % y; x = t; /* y1 <- x0 % y0 ; x1 <- y0 */
@ -16,18 +16,18 @@ static unsigned long gcd_ui(unsigned long x, unsigned long y) {
return x;
}
unsigned long binomial(unsigned long n, unsigned long k) {
unsigned long d, g, r = 1;
unsigned long long binomial(unsigned long long n, unsigned long long k) {
unsigned long long d, g, r = 1;
if (k == 0) return 1;
if (k == 1) return n;
if (k >= n) return (k == n);
if (k > n/2) k = n-k;
for (d = 1; d <= k; d++) {
if (r >= ULONG_MAX/n) { /* Possible overflow */
unsigned long nr, dr; /* reduced numerator / denominator */
if (r >= ULONG_LONG_MAX/n) { /* Possible overflow */
unsigned long long nr, dr; /* reduced numerator / denominator */
g = gcd_ui(n, d); nr = n/g; dr = d/g;
g = gcd_ui(r, dr); r = r/g; dr = dr/g;
if (r >= ULONG_MAX/nr) return 0; /* Unavoidable overflow */
if (r >= ULONG_LONG_MAX/nr) return 0; /* Unavoidable overflow */
r *= nr;
r /= dr;
n--;
@ -39,7 +39,7 @@ unsigned long binomial(unsigned long n, unsigned long k) {
return r;
}
unsigned long binomial_(int *n, int *k)
unsigned long long binomial_(int *n, int *k)
{
// printf("n=%d k=%d %lu\n",*n,*k,binomial(*n,*k));
return binomial(*n,*k);