Function validmapname

source/src/protocol.cpp:253–283

//#define FILENAMESALLLOWERCASE

bool validmapname(const char *s) // checks for length, allowed chars and special DOS filenames
{
    int len = strlen(s);
    if(len > MAXMAPNAMELEN) return false;
    if(len == 3 || len == 4)
    {
        char uc[4];
        loopi(3) uc[i] = toupper(s[i]);
        uc[3] = '\0';
        const char *resd = "COMLPTCONPRNAUXNUL", *fnd = strstr(resd, uc);
        if(fnd)
        {
            int pos = (int) (fnd - resd);
            if(pos == 0 || pos == 3)
            {
                if(isdigit(s[3])) return false; // COMx, LPTx
            }
            else if(pos % 3 == 0) return false; // CON, PRN, AUX, NUL
        }
    }
    while(*s != '\0')
    {
#ifdef FILENAMESALLLOWERCASE
        if(!islower(*s) && !isdigit(*s) && *s != '_' && *s != '-' && *s != '.') return false;
#else
        if(!isalnum(*s) && *s != '_' && *s != '-' && *s != '.') return false;
#endif
        ++s;
    }
    return true;
}


// filter text according to rules