Update.
[glibc.git] / sunrpc / xdr_mem.c
blobb328d5982908defa5e98d39507b9bc06bad36a2e
1 /*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
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7 * program developed by the user.
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15 * modification or enhancement.
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18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
25 * Sun Microsystems, Inc.
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27 * Mountain View, California 94043
31 * xdr_mem.h, XDR implementation using memory buffers.
33 * Copyright (C) 1984, Sun Microsystems, Inc.
35 * If you have some data to be interpreted as external data representation
36 * or to be converted to external data representation in a memory buffer,
37 * then this is the package for you.
41 #include <string.h>
42 #include <rpc/rpc.h>
44 static bool_t xdrmem_getlong (XDR *, long *);
45 static bool_t xdrmem_putlong (XDR *, const long *);
46 static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
47 static bool_t xdrmem_putbytes (XDR *, const char *, u_int);
48 static u_int xdrmem_getpos (const XDR *);
49 static bool_t xdrmem_setpos (XDR *, u_int);
50 static int32_t *xdrmem_inline (XDR *, int);
51 static void xdrmem_destroy (XDR *);
52 static bool_t xdrmem_getint32 (XDR *, int32_t *);
53 static bool_t xdrmem_putint32 (XDR *, const int32_t *);
55 static const struct xdr_ops xdrmem_ops =
57 xdrmem_getlong,
58 xdrmem_putlong,
59 xdrmem_getbytes,
60 xdrmem_putbytes,
61 xdrmem_getpos,
62 xdrmem_setpos,
63 xdrmem_inline,
64 xdrmem_destroy,
65 xdrmem_getint32,
66 xdrmem_putint32
70 * The procedure xdrmem_create initializes a stream descriptor for a
71 * memory buffer.
73 void
74 xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op)
76 xdrs->x_op = op;
77 /* We have to add the const since the `struct xdr_ops' in `struct XDR'
78 is not `const'. */
79 xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops;
80 xdrs->x_private = xdrs->x_base = addr;
81 xdrs->x_handy = size;
85 * Nothing needs to be done for the memory case. The argument is clearly
86 * const.
89 static void
90 xdrmem_destroy (XDR *xdrs)
95 * Gets the next word from the memory referenced by xdrs and places it
96 * in the long pointed to by lp. It then increments the private word to
97 * point at the next element. Neither object pointed to is const
99 static bool_t
100 xdrmem_getlong (XDR *xdrs, long *lp)
102 if ((xdrs->x_handy -= 4) < 0)
103 return FALSE;
104 *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));
105 xdrs->x_private += 4;
106 return TRUE;
110 * Puts the long pointed to by lp in the memory referenced by xdrs. It
111 * then increments the private word to point at the next element. The
112 * long pointed at is const
114 static bool_t
115 xdrmem_putlong (XDR *xdrs, const long *lp)
117 if ((xdrs->x_handy -= 4) < 0)
118 return FALSE;
119 *(int32_t *) xdrs->x_private = htonl (*lp);
120 xdrs->x_private += 4;
121 return TRUE;
125 * Gets an unaligned number of bytes from the xdrs structure and writes them
126 * to the address passed in addr. Be very careful when calling this routine
127 * as it could leave the xdrs pointing to an unaligned structure which is not
128 * a good idea. None of the things pointed to are const.
130 static bool_t
131 xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
133 if ((xdrs->x_handy -= len) < 0)
134 return FALSE;
135 memcpy (addr, xdrs->x_private, len);
136 xdrs->x_private += len;
137 return TRUE;
141 * The complementary function to the above. The same warnings apply about
142 * unaligned data. The source address is const.
144 static bool_t
145 xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
147 if ((xdrs->x_handy -= len) < 0)
148 return FALSE;
149 memcpy (xdrs->x_private, addr, len);
150 xdrs->x_private += len;
151 return TRUE;
155 * Not sure what this one does. But it clearly doesn't modify the contents
156 * of xdrs. **FIXME** does this not assume u_int == u_long?
158 static u_int
159 xdrmem_getpos (const XDR *xdrs)
161 return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
165 * xdrs modified
167 static bool_t
168 xdrmem_setpos (xdrs, pos)
169 XDR *xdrs;
170 u_int pos;
172 caddr_t newaddr = xdrs->x_base + pos;
173 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
175 if ((long) newaddr > (long) lastaddr)
176 return FALSE;
177 xdrs->x_private = newaddr;
178 xdrs->x_handy = (long) lastaddr - (long) newaddr;
179 return TRUE;
183 * xdrs modified
185 static int32_t *
186 xdrmem_inline (XDR *xdrs, int len)
188 int32_t *buf = 0;
190 if (xdrs->x_handy >= len)
192 xdrs->x_handy -= len;
193 buf = (int32_t *) xdrs->x_private;
194 xdrs->x_private += len;
196 return buf;
200 * Gets the next word from the memory referenced by xdrs and places it
201 * in the int pointed to by ip. It then increments the private word to
202 * point at the next element. Neither object pointed to is const
204 static bool_t
205 xdrmem_getint32 (XDR *xdrs, int32_t *ip)
207 if ((xdrs->x_handy -= 4) < 0)
208 return FALSE;
209 *ip = ntohl ((*((int32_t *) (xdrs->x_private))));
210 xdrs->x_private += 4;
211 return TRUE;
215 * Puts the long pointed to by lp in the memory referenced by xdrs. It
216 * then increments the private word to point at the next element. The
217 * long pointed at is const
219 static bool_t
220 xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
222 if ((xdrs->x_handy -= 4) < 0)
223 return FALSE;
224 *(int32_t *) xdrs->x_private = htonl (*ip);
225 xdrs->x_private += 4;
226 return TRUE;