Memory allocation error under Windows

[ravishi]

Well, this is my first topic at this forum and I'm a newbie on C programming too.

I'm coding a little program and I've used some "dynamic arrays" on it. Compiling and running the program on Linux worked fine for me. But I was very curious to see how the program runs on Windows, so I decided to test it. Compilation was fine too, but when I run the program, I get a memorry allocation error.

Here's the code:

int *tspos, *tepos = NULL;
int tcc = 0;
.
.
.
// the following loop loops about 30000 times
// and saves the beggining and the ending position
// of some texts
loop() {
    if((tspos=(int *)realloc(tspos,(tcc+1)*sizeof(int)))==NULL)
        error("Memory error while saving temp text data!\n");
    if((tepos=(int *)realloc(tepos,(tcc+1)*sizeof(int)))==NULL)
        error("Memory error while saving temp text data2!\n");
    tspos[tcc]=spos;
    tepos[tcc]=epos;
    tcc++;
}

That is the part. I compiled it and when I run it I get the message "Memory error while saving temp text data!"

On Linux I was using the gcc compiler. On Windows, I'm using Dev-C++ 4.9.9.2 with Mingw/GCC 3.4.2.

Ss I said, it is compiled on Windows, but I get the memory error when try to run.

I think that it's because of the differences between Windows/Linux memory allocation and need to say that my program uses "a lot of memory" (more especificaly, something about 25MiB).

So, why did it occurs? It's because of the "malloc/realloc" inside a big loop?

Thanks for the answers.

[JosAH]

Maybe you do actually run out of memory when running on MS Windows; one little thing: why don't you initialize tspos to NULL when you start your loop?

kind regards,

Jos

[ravishi]

thank you

but the problem was here:

int *tspos, *tepos = NULL;

according to another answer that i received, "tepos has a value of NULL, tspos has an undefined value. GCC might handle that more gracefully by default than Dev-C++" (ref: http://www.gidforums.com/showthread....0127#post80127).

so, all I have to do is:

int *tspos, *tepos;
.
.
.
tspos=NULL;
tepos=NULL;
...

thanks.