Function strlenSafe

Kernel/src/arch/x86_64/stringsafe.cpp:5–38

#include <paging.h>

long strlenSafe(const char* str, size_t& size, address_space_t* aSpace)
{
	size_t pageBoundary = PAGE_SIZE_4K - (reinterpret_cast<uintptr_t>(str) & (PAGE_SIZE_4K - 1)); // Get amount of bytes to page boundary
	if(!Memory::CheckUsermodePointer(reinterpret_cast<uintptr_t>(str), pageBoundary, aSpace)){
        return 1;
    }

    size_t& i = size;
    i = 0;

    while(i < pageBoundary){
        if(str[i] == '\0'){
            return 0;
        }

        i++;
    }


    for(;;){
        if(!Memory::CheckUsermodePointer(reinterpret_cast<uintptr_t>(str) + i, PAGE_SIZE_4K, aSpace)){
            return 1;
        }

        size_t pageBoundary = i + PAGE_SIZE_4K;
        while(i < pageBoundary){
            if(str[i] == '\0'){
                return 0;
            }

            i++;
        }
    }
}