diff options
Diffstat (limited to 'lib/libc/xdr/xdr_sizeof.c')
| -rw-r--r-- | lib/libc/xdr/xdr_sizeof.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/lib/libc/xdr/xdr_sizeof.c b/lib/libc/xdr/xdr_sizeof.c new file mode 100644 index 000000000000..b374daf82a39 --- /dev/null +++ b/lib/libc/xdr/xdr_sizeof.c @@ -0,0 +1,154 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2010, Oracle America, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * * Neither the name of the "Oracle America, Inc." nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +/* + * xdr_sizeof.c + * + * General purpose routine to see how much space something will use + * when serialized using XDR. + */ + +#include "namespace.h" +#include <rpc/types.h> +#include <rpc/xdr.h> +#include <sys/types.h> +#include <stdlib.h> +#include "un-namespace.h" + +/* ARGSUSED */ +static bool_t +x_putlong(XDR *xdrs, const long *longp) +{ + xdrs->x_handy += BYTES_PER_XDR_UNIT; + return (TRUE); +} + +/* ARGSUSED */ +static bool_t +x_putbytes(XDR *xdrs, const char *bp, u_int len) +{ + xdrs->x_handy += len; + return (TRUE); +} + +static u_int +x_getpostn(XDR *xdrs) +{ + return (xdrs->x_handy); +} + +/* ARGSUSED */ +static bool_t +x_setpostn(XDR *xdrs, u_int pos) +{ + /* This is not allowed */ + return (FALSE); +} + +static int32_t * +x_inline(XDR *xdrs, u_int len) +{ + if (len == 0) { + return (NULL); + } + if (xdrs->x_op != XDR_ENCODE) { + return (NULL); + } + if (len < (u_int)(uintptr_t)xdrs->x_base) { + /* x_private was already allocated */ + xdrs->x_handy += len; + return ((int32_t *) xdrs->x_private); + } else { + /* Free the earlier space and allocate new area */ + if (xdrs->x_private) + free(xdrs->x_private); + if ((xdrs->x_private = (caddr_t) malloc(len)) == NULL) { + xdrs->x_base = 0; + return (NULL); + } + xdrs->x_base = (caddr_t)(uintptr_t)len; + xdrs->x_handy += len; + return ((int32_t *) xdrs->x_private); + } +} + +static int +harmless(void) +{ + /* Always return FALSE/NULL, as the case may be */ + return (0); +} + +static void +x_destroy(XDR *xdrs) +{ + xdrs->x_handy = 0; + xdrs->x_base = 0; + if (xdrs->x_private) { + free(xdrs->x_private); + xdrs->x_private = NULL; + } + return; +} + +unsigned long +xdr_sizeof(xdrproc_t func, void *data) +{ + XDR x; + struct xdr_ops ops; + bool_t stat; + /* to stop ANSI-C compiler from complaining */ + typedef bool_t (* dummyfunc1)(XDR *, long *); + typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); + + ops.x_putlong = x_putlong; + ops.x_putbytes = x_putbytes; + ops.x_inline = x_inline; + ops.x_getpostn = x_getpostn; + ops.x_setpostn = x_setpostn; + ops.x_destroy = x_destroy; + + /* the other harmless ones */ + ops.x_getlong = (dummyfunc1) harmless; + ops.x_getbytes = (dummyfunc2) harmless; + + x.x_op = XDR_ENCODE; + x.x_ops = &ops; + x.x_handy = 0; + x.x_private = (caddr_t) NULL; + x.x_base = (caddr_t) 0; + + stat = func(&x, data); + if (x.x_private) + free(x.x_private); + return (stat == TRUE ? (unsigned) x.x_handy: 0); +} |