Function modifyvar

source/src/command.cpp:1338–1373

#endif

void modifyvar(const char *name, int arg, char op)
{
    ident *id = idents->access(name);
    if(!id) return;
    if(identaccessdenied(id))
    {
        conoutf("not allowed in this execution context: %s", id->name);
        scripterr();
        return;
    }
    if((id->type == ID_VAR && id->minval > id->maxval) || (id->type == ID_FVAR && id->minvalf > id->maxvalf)) { conoutf("variable %s is read-only", id->name); return; }
    int val = 0;
    switch(id->type)
    {
        case ID_VAR: val = *id->storage.i; break;
        case ID_FVAR: val = int(*id->storage.f); break;
        case ID_SVAR: { { if(id->getfun) ((void (__cdecl *)())id->getfun)(); } val = ATOI(*id->storage.s); break; }
        case ID_ALIAS: val = ATOI(id->action); break;
        default: return;
    }
    switch(op)
    {
        case '+': val += arg; break;
        case '-': val -= arg; break;
        case '*': val *= arg; break;
        case '/': val = arg ? val / arg : 0; break;
    }
    switch(id->type)
    {
        case ID_VAR: *id->storage.i = clamp(val, id->minval, id->maxval); break;
        case ID_FVAR: *id->storage.f = clamp((float)val, id->minvalf, id->maxvalf); break;
        case ID_SVAR:  { string str; itoa(str, val); *id->storage.s = exchangestr(*id->storage.s, str); break; }
        case ID_ALIAS: { string str; itoa(str, val); alias(name, str); return; }
    }
    if(id->fun) ((void (__cdecl *)())id->fun)();
}

void addeq(char *name, int *arg) { modifyvar(name, *arg, '+'); }    COMMANDN(+=, addeq, "si");
void subeq(char *name, int *arg) { modifyvar(name, *arg, '-'); }    COMMANDN(-=, subeq, "si");