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applets/qrpn: misc fixes (#68)

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rlcamp 2022-05-05 12:00:11 -07:00 committed by GitHub
parent e7f4729567
commit 799c9e68c7
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1 changed files with 3 additions and 11 deletions
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14
applets/qrpn/qrpn.c
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@ -76,6 +76,7 @@ static unsigned long long gcd(unsigned long long a, unsigned long long b) {
static unsigned long long nchoosek(const unsigned long long n, const unsigned long long k) {
if (1 == k) return n;
if (k > n - k) return nchoosek(n, n - k);
unsigned long long n_choose_k = n * (n - 1) / 2;
for (size_t kr = 3; kr <= k; kr++)
n_choose_k *= (n + 1 - kr) / kr;
@ -221,8 +222,8 @@ static const struct named_quantity named_quantities[] = {
{ .value = 4.184e6, .units = { 2, 0, -2, 0, 0, 0, 0 }, .name = "TNT" },
{ .value = 1852.0, .units = { 1, 0, 0, 0, 0, 0, 0 }, .name = "nmi" },
{ .value = 0.514444444, .units = { 1, 0, -1, 0, 0, 0, 0 }, .name = "knot", .abrv = "kt", },
{ .value = 1609.34, .units = { 1, 0, 0, 0, 0, 0, 0 }, .name = "mile" },
{ .value = 1609.34 / 3600, .units = { 1, 0, -1, 0, 0, 0, 0 }, .abrv = "mph" },
{ .value = 1609.344, .units = { 1, 0, 0, 0, 0, 0, 0 }, .name = "mile" },
{ .value = 1609.344 / 3600, .units = { 1, 0, -1, 0, 0, 0, 0 }, .abrv = "mph" },
{ .value = 86400.0 * 365.2425, .units = { 0, 0, 1, 0, 0, 0, 0 }, .name = "year", .abrv = "a" },
{ .value = 1852.0 * 3, .units = { 1, 0, 0, 0, 0, 0, 0 }, .name = "league" },
{ .value = 9.8066, .units = { 1, 0, -2, 0, 0, 0, 0 }, .name = "g" },
@ -650,13 +651,6 @@ int qrpn_evaluate_token(struct quantity * const stack, int S, const char * const
stack[S] = stack[S - 2];
return S + 1;
}
else if (!strcmp(token, "2over")) {
if (S < 4) return QRPN_ERROR_NOT_ENOUGH_STACK;
if (S + 2 > QRPN_STACK_SIZE_MAX) return QRPN_ERROR_TOO_MUCH_STACK;
stack[S] = stack[S - 4];
stack[S + 1] = stack[S - 3];
return S + 2;
}
else if (!strcmp(token, "pick")) {
if (S < 2) return QRPN_ERROR_NOT_ENOUGH_STACK;
if (!units_are_dimensionless(stack[S - 1].units)) return QRPN_ERROR_MUST_BE_UNITLESS;
@ -673,8 +667,6 @@ int qrpn_evaluate_token(struct quantity * const stack, int S, const char * const
if (cimag(stack[S - 1].value)) return QRPN_ERROR_MUST_BE_REAL;
if (creal(stack[S - 1].value) < 0) return QRPN_ERROR_MUST_BE_NONNEGATIVE;
const long arg = lrint(creal(stack[S - 1].value));
/* "2 roll" is equivalent to "rot" and requires 3 things on stack AFTER decrementing it by one */
/* assuming arg is 2, we are going to rotate S - 4, S - 3, and S - 2 */
if (S < 2 + arg) return QRPN_ERROR_NOT_ENOUGH_STACK;
const struct quantity tmp = stack[S - arg - 2];
memmove(stack + S - arg - 2, stack + S - arg - 1, sizeof(struct quantity) * arg);