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31 * $FreeBSD: head/lib/libc/xdr/xdr_sizeof.c 283835 2015-05-31 19:09:24Z rodrigc $
37 * General purpose routine to see how much space something will use
38 * when serialized using XDR.
41 #include "namespace.h"
42 #include <rpc/types.h>
44 #include <sys/types.h>
46 #include "un-namespace.h"
50 x_putlong(XDR *xdrs, const long *longp __unused)
52 xdrs->x_handy += BYTES_PER_XDR_UNIT;
58 x_putbytes(XDR *xdrs, const char *bp __unused, u_int len)
67 return (xdrs->x_handy);
72 x_setpostn(XDR *xdrs __unused, u_int pos __unused)
74 /* This is not allowed */
79 x_inline(XDR *xdrs, u_int len)
84 if (xdrs->x_op != XDR_ENCODE) {
87 if (len < (u_int)(uintptr_t)xdrs->x_base) {
88 /* x_private was already allocated */
90 return ((int32_t *) xdrs->x_private);
92 /* Free the earlier space and allocate new area */
94 free(xdrs->x_private);
95 if ((xdrs->x_private = (caddr_t) malloc(len)) == NULL) {
99 xdrs->x_base = (caddr_t)(uintptr_t)len;
100 xdrs->x_handy += len;
101 return ((int32_t *) xdrs->x_private);
108 /* Always return FALSE/NULL, as the case may be */
117 if (xdrs->x_private) {
118 free(xdrs->x_private);
119 xdrs->x_private = NULL;
125 xdr_sizeof(xdrproc_t func, void *data)
130 /* to stop ANSI-C compiler from complaining */
131 typedef bool_t (* dummyfunc1)(XDR *, long *);
132 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
134 ops.x_putlong = x_putlong;
135 ops.x_putbytes = x_putbytes;
136 ops.x_inline = x_inline;
137 ops.x_getpostn = x_getpostn;
138 ops.x_setpostn = x_setpostn;
139 ops.x_destroy = x_destroy;
141 /* the other harmless ones */
142 ops.x_getlong = (dummyfunc1) harmless;
143 ops.x_getbytes = (dummyfunc2) harmless;
149 x.x_base = (caddr_t) 0;
151 stat = func(&x, data);
154 return (stat == TRUE ? (unsigned) x.x_handy: 0);