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#include "Stack.h"
#include <string>
Stack::Stack()
{
top = bottom = (stackval *) malloc (sizeof(stackval) * initialSize);
limit = bottom + initialSize;
top->type = T_UNUSED;
top->value.floatval = 0;
fToAMask = defaultFToAMask;
}
Stack::~Stack()
{
free(bottom);
}
void
Stack::clear()
{
while (top > bottom)
{
if (top->type == T_STRING)
{
free(top->value.string);
top->value.string = NULL;
}
top->type = T_UNUSED;
top--;
}
top->type = T_UNUSED;
top->value.floatval = 0;
fToAMask = defaultFToAMask;
}
void
Stack::checkLimit()
{
while (top + 1 >= limit)
{
limit += limit - bottom;
stackval *newbottom = (stackval *) realloc(bottom, sizeof(stackval) * (limit - bottom));
if (!newbottom)
{
exit(1);
}
int diff = newbottom - bottom;
bottom = newbottom;
top += diff;
limit += diff;
}
}
void
Stack::push(char *c)
{
checkLimit();
top++;
top->type = T_STRING;
top->value.string = strdup(c);
}
void
Stack::push(int i)
{
checkLimit();
top++;
top->type = T_INT;
top->value.intval = i;
}
void
Stack::push(double d)
{
checkLimit();
top++;
top->type = T_FLOAT;
top->value.floatval = d;
}
stackval *
Stack::pop()
{
stackval *temp = top;
top--;
return temp;
}
void
Stack::clean(stackval *sv)
{
if (sv->type == T_STRING && sv->value.string)
{
free(sv->value.string);
top->value.string = NULL;
sv->type = T_UNUSED;
}
}
void
Stack::swap()
{
// swap top two elements
stackval temp;
stackval *two = top - 1;
temp.type = two->type;
temp.value = two->value;
two->type = top->type;
two->value = top->value;
top->type = temp.type;
top->value = temp.value;
}
void
Stack::topto2()
{
// move the top of the stack under the next two
// 0, 1, 2, 3... becomes 1, 2, 0, 3...
stackval temp;
stackval *two = top - 1;
stackval *three = top - 2;
temp.type = top->type;
temp.value = top->value;
top->type = two->type;
top->value = two->value;
two->type = three->type;
two->value = three->value;
three->type = temp.type;
three->value = temp.value;
}
int
Stack::popint()
{
int i=0;
i = toint(top);
clean(top);
if (top > bottom) top--;
return i;
}
int
Stack::toint(stackval *sv)
{
int i=0;
if (sv->type == T_INT) {
i = sv->value.intval;
}
else if (sv->type == T_FLOAT) {
i = (int) sv->value.floatval;
}
else if (sv->type == T_STRING)
{
i = (int) atoi(sv->value.string);
}
return i;
}
double
Stack::popfloat()
{
double f=0;
f = tofloat(top);
clean(top);
if (top > bottom) top--;
return f;
}
double
Stack::tofloat(stackval *sv)
{
double f=0;
if (sv->type == T_FLOAT) {
f = sv->value.floatval;
}
else if (sv->type == T_INT)
{
f = (double) sv->value.intval;
}
else if (sv->type == T_STRING)
{
f = (double) atof(sv->value.string);
}
return f;
}
char*
Stack::popstring()
{
char *s=tostring(top);
top->type = T_UNUSED;
if (top > bottom) top--;
return s;
}
char*
Stack::tostring(stackval *sv)
{
// don't forget to free() the string returned by this function when you are done with it
char *s=NULL;
if (sv->type == T_STRING) {
s = sv->value.string;
sv->value.string = NULL;
sv->type = T_UNUSED;
}
else if (sv->type == T_INT)
{
char buffer[64];
sprintf(buffer, "%d", sv->value.intval);
s = strdup(buffer);
}
else if (sv->type == T_FLOAT)
{
char buffer[64];
sprintf(buffer, "%#.*lf", fToAMask, sv->value.floatval);
// strip trailing zeros and decimal point
while(buffer[strlen(buffer)-1]=='0') buffer[strlen(buffer)-1] = 0x00;
if(buffer[strlen(buffer)-1]=='.') buffer[strlen(buffer)-1] = 0x00;
// return
s = strdup(buffer);
}
return s;
}
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