C Programming: malloc() inside another function

Question

I need help with malloc() inside another function.

I\'m passing a pointer and size to the fu

Answer 1

This does not make sense :

if(alloc_pixels(input_image, bmp_image_size)==NULL) 

alloc_pixels returns a signed char (ERROR or NO_ERROR) and you compare it to NULL (which is supposed to be used for pointers).

If you want input_image to be changed, you need to pass a pointer to it to alloc_pixels. alloc_pixels signature would be the following:

signed char alloc_pixels(unsigned char **ptr, unsigned int size)

You would call it like this:

alloc_pixels(&input_image, bmp_image_size);

And the memory allocation

*ptr = malloc(size);