389     Oobject *oself;  in O_cwrite()  local
393     oself = (Oobject *)self;  in O_cwrite()
401     if (oself->pos >= PY_SSIZE_T_MAX - len) {  in O_cwrite()
406     newpos = oself->pos + len;  in O_cwrite()
407     if (newpos >= oself->buf_size) {  in O_cwrite()
408         size_t newsize = oself->buf_size;  in O_cwrite()
414         newbuf = (char*)realloc(oself->buf, newsize);  in O_cwrite()
419         oself->buf_size = (Py_ssize_t)newsize;  in O_cwrite()
420         oself->buf = newbuf;  in O_cwrite()
423     if (oself->string_size < oself->pos) {  in O_cwrite()
432         memset(oself->buf + oself->string_size, '\0',  in O_cwrite()
433                (oself->pos - oself->string_size) * sizeof(char));  in O_cwrite()
436     memcpy(oself->buf + oself->pos, c, len);  in O_cwrite()
438     oself->pos = newpos;  in O_cwrite()
440     if (oself->string_size < oself->pos) {  in O_cwrite()
441         oself->string_size = oself->pos;  in O_cwrite()