Character Arrays - Cast Help (Simple - I think)

[boscord]

Hey!

Ok heres the scoop, I want to manipulate an input string, but first requiring a copy from the input text into another character array.

My question is: Can you set the cast/char size of a character array at runtime: a.k.a.:

char string[len(inputstr)]

or something like that where I can alter the cast size depending on the length of the input string.

Thanks!

[kedaman]

You need to use dynamically allocated char arrays, those you will allocate like follows:
char* array=new array[size];

to resize an array you can use my resize function, note the arrays have to be on the heap, otherways it won't work.

template <class T>
T* resize(T*& x,int size){T* temp=(T*)memcpy(new T[size],x,_msize(x));delete[]x;return x=temp;} 

[jim mcnamara]

// a simple C version

// you have a char arr[100] you need a duplicate
char *t;

char t = calloc(sizeof(char) * 100);

strcpy(t,arr);

[boscord]

Awesome!

It works!

Thanks!

[parksie]

Originally posted by jim mcnamara

// a simple C version

// you have a char arr[100] you need a duplicate
char *t;

char t = calloc(sizeof(char) * 100);

strcpy(t,arr);

What's different with calloc and malloc? Can you still use realloc and free with calloc?

[kedaman]

I think calloc fills the allocated space with nulls :S

[parksie]

So it's a bit pointless for VC++, since in debug mode they fill it with 0xCDCD or something like that (there's different values for different ways of allocating things - it's how the RTL checks for invalid pointer use).