72    uintptr_t bufCur;   //! current position, could be outside of valid range  member
84    buf->bufStart = buf->bufCur = (uintptr_t)data - offset;  in sbuf_init()
90    buf->bufCur += len;  in sbuf_advance()
98    return buf->bufCur - buf->bufStart;  in sbuf_needed()
105    return buf->bufEnd - buf->bufCur;  in sbuf_left()
110    return (void*)buf->bufCur;  in sbuf_head()
115    return buf->bufCur >= buf->buf && buf->bufCur < buf->bufEnd;  in sbuf_valid()
133    if(buf->bufCur + srcLen > buf->buf) {  in sbuf_write()
135       if(buf->bufCur < buf->buf) {  in sbuf_write()
136          int len = buf->buf - buf->bufCur;  in sbuf_write()
143          std_memsmove((void*)buf->bufCur, buf->bufEnd - buf->bufCur, (void*)src, writeLen);  in sbuf_write()
159    if(buf->bufCur + dstLen > buf->buf) {  in sbuf_read()
161       if(buf->bufCur < buf->buf) {  in sbuf_read()
162          int len = buf->buf - buf->bufCur;  in sbuf_read()
169          std_memsmove((void*)dst, dstLen, (void*)buf->bufCur, readLen);  in sbuf_read()