Parser + Str2Int, C++ (gcc)

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#include <iostream>
#include <sstream>

bool GetNextElement(const char *&From, char *Buffer)
{   
    if(From==nullptr) return false;
    while(*From!='\0'&&*From!=' ')
    {
        *Buffer=*From;
        ++From;
        ++Buffer;
    }
    ++From;
    *Buffer='\0';
    if(*From=='\0') From=nullptr;
    return true;
}

int Str2Int(const char *Buffer)
{
    const char *Itr=Buffer;
    while(*Itr!='\0') ++Itr;
    --Itr;
    int Multi=1;
    int Ret=0;
    while(Itr>=Buffer)
    {
        Ret+=(*Itr-'0')*Multi;
        Multi*=10;
        if(*Itr=='-') Ret=-Ret;
        --Itr;
    }
    return Ret;
}

1253
    Ret=('3'-'0')*1+('5'-'0')*10+('2'-'0')*100+('1'-'0')*1000;
    if(*Itr=='-') Ret=-Ret;

int main()
{
    const char Script[]="105 2 3 -2 -3 6";
    const char *Progress;
    Progress=Script;
    //char *Itr_Buffer;
    char Buffer[20];
    
    int S=0;
    
    while(GetNextElement(Progress, Buffer))
    {
        S+=Str2Int(Buffer);
        std::cout<<"("<<Buffer<<")+";  
    }
    std::cout<<"="<<S;
}

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