#include "String.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void stringInit(String* s)
{
    s->length = 0;
    s->data = NULL;
}

void stringRemove(String* s)
{
    s->length = 0;
    if(s->data != NULL)
    {
        free(s->data);
        s->data = NULL;
    }
}

int stringGetLength(String* s)
{
    return s->length;
}

void stringRead(String* s)
{
    int buffer = 16;
    int index = 0;
    char* chars = malloc(sizeof(char) * buffer);
    while(1)
    {
        int c = fgetc(stdin);
        if(c == EOF || c == '\n')
        {
            break;
        }
        
        if(index == buffer)
        {
            char* newBuffer = malloc(sizeof(char) * buffer * 2);
            memcpy(newBuffer, chars, buffer);
            free(chars);
            chars = newBuffer;
            buffer *= 2;
        }
        chars[index] = c;
        index++;
    }
    
    s->length = index;
    s->data = malloc(sizeof(char) * (index + 1));
    memcpy(s->data, chars, index);
    free(chars);
    s->data[index] = '\0';
}

int stringCompare(String* s, const char* chars)
{
    return strcmp(s->data, chars) == 0;
}