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Added addition and substraction methods

This commit is contained in:
Zezombye 2016-12-28 20:32:46 +01:00
parent 0b03fc66c1
commit 2b9c390687
1 changed files with 20 additions and 19 deletions
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39
B2C/src/B2CFunctions.c
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@ -100,24 +100,6 @@ BCDvar *B2C_sub(BCDvar *buffer, BCDvar *a, BCDvar *b) {
unsigned char tempByte;
int result[15] = {0};
//Check for special cases
//a > 0 and b < 0 -> a+(-b)
//Ex: 3-(-4) -> 3+4
if ((*a)[0] < 0x30 && (*b)[0] > 0x30) {
BCDvar b2;
memcpy(b2, b, 9);
b2[0] -= 0x50;
return B2C_add(buffer, a, &b2);
}
//a < 0 and b > 0 -> -(a+b)
//Ex: (-4)-3 -> -(4+3)
if ((*a)[0] > 0x30 && (*b)[0] < 0x30) {
BCDvar a2;
memcpy(a2, a, 9);
a2[0] -= 0x50;
B2C_add(buffer, &a2, b);
(*buffer)[0] += 0x50;
return buffer;
}
//a < 0 and b < 0 -> b-a
//Ex: (-4)-(-3) -> 3-4
if ((*a)[0] > 0x30 && (*b)[0] > 0x30) {
@ -126,8 +108,27 @@ BCDvar *B2C_sub(BCDvar *buffer, BCDvar *a, BCDvar *b) {
memcpy(b2, b, 9);
a2[0] -= 0x50;
b2[0] -= 0x50;
return B2C_sub(buffer, &a2, &b2);
return B2C_sub(buffer, &b2, &a2);
}
//a > 0 and b < 0 -> a+(-b)
//Ex: 3-(-4) -> 3+4
if ((*b)[0] > 0x30) {
BCDvar b2;
memcpy(b2, b, 9);
b2[0] -= 0x50;
return B2C_add(buffer, a, &b2);
}
//a < 0 and b > 0 -> -(a+b)
//Ex: (-4)-3 -> -(4+3)
if ((*a)[0] > 0x30) {
BCDvar a2;
memcpy(a2, a, 9);
a2[0] -= 0x50;
B2C_add(buffer, &a2, b);
(*buffer)[0] += 0x50;
return buffer;
}
//if a < b sub b-a
if (B2C_greaterThan(b, a)) {
return B2C_sub(buffer, b, a);