Function filterrichtext

source/src/protocol.cpp:393–430

// dst can be identical to src; dst needs to be of size "min(len, strlen(s)) + 1"

void filterrichtext(char *dst, const char *src, int len)
{
    int b, c;
    unsigned long ul;
    for(c = *src; c; c = *++src)
    {
        c &= 0x7F; // 7-bit ascii
        if(c == '\\')
        {
            b = 0;
            c = *++src;
            switch(c)
            {
                case '\0': --src; continue;
                case 'f': c = '\f'; break;
                case 'i': c = '\1'; break;
                case 'a': c = '\a'; break;
                case 't': c = '\t'; break;
                case 'n': c = '\n'; break;
                case '_': c = ' '; break;
                case 'x':
                    b = 16;
                    c = *++src;
                default:
                    if(isspace(c)) continue;
                    if(b == 0 && !isdigit(c)) break;
                    ul = strtoul(src, (char **) &src, b);
                    --src;
                    c = (int) ul & 0x7f;
                    if(!c) continue; // number conversion failed
                    break;
            }
        }
        *dst++ = c;
        if(!--len || !*src) break;
    }
    *dst = '\0';
}

// counterpart of filterrichtext