Resize an array in C

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Hans

Re: Resize an array in C

Posted on: 2009/9/16 22:55 #21

Home away from home

@thomas

Quote:

thomas wrote:
@freddix
In order to keep it as simple as possible I would do something like this:

char WindowTitle[256] = "MyTitle";
.
.
.
strcpy (WindowTitle,"TitleEnteredByUser");

Just make sure that the user cannot enter more than 255 characters.

Sure that might save you a few hours now, but it's really easy for subtle bugs to be created this way, and it's not generic. Spending a few hours creating a string ADT with appropriate manipulation functions can save a lot of heart-ache later. Plus, it's more generic, so you can use it everywhere that you use strings.

Hans

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xenic

Re: Resize an array in C

Posted on: 2009/9/17 4:39 #22

Just can't stay away

@freddix
Quote:

freddix wrote:
Imagine I have an array defined with this :

char WindowTitle[] = "MyArray";

and I want during execution for example, to change it by a new string

char NewTitle[] = "TitleEnteredByUser";

and I want to put NewTitle[] -> WindowTitle[]

Does someone have an idea ?

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

int main(VOID)
{
char *WindowTitle = strdup("mytitle");
char NewTitle[] = "TitleEnteredByUser";

free(WindowTitle);
WindowTitle = strdup(NewTitle);
printf("Title is: %s\n", WindowTitle);
free(WindowTitle);
return 0;
}

The strdup() function doesn't check for NULL pointers so you might want to create a NULL safe function like:
char *mystrdup(char *dupstring)
{
if (dupstring) return strdup(dupstring);
return NULL;
}

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