+int BUF_MEM_grow_clean(BUF_MEM *str, int len)
+ {
+ char *ret;
+ unsigned int n;
+
+ if (str->length >= len)
+ {
+ memset(&str->data[len],0,str->length-len);
+ str->length=len;
+ return(len);
+ }
+ if (str->max >= len)
+ {
+ memset(&str->data[str->length],0,len-str->length);
+ str->length=len;
+ return(len);
+ }
+ n=(len+3)/3*4;
+ if (str->data == NULL)
+ ret=OPENSSL_malloc(n);
+ else
+ ret=OPENSSL_realloc_clean(str->data,str->max,n);
+ if (ret == NULL)
+ {
+ BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
+ len=0;
+ }
+ else
+ {
+ str->data=ret;
+ str->max=n;
+ memset(&str->data[str->length],0,len-str->length);
+ str->length=len;
+ }
+ return(len);
+ }
+