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31 * xdr_stdio.c, XDR implementation on standard i/o file.
33 * Copyright (C) 1984, Sun Microsystems, Inc.
35 * This set of routines implements a XDR on a stdio stream.
36 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
45 # include <libio/iolibio.h>
46 # define fflush(s) INTUSE(_IO_fflush) (s)
47 # define fread(p, m, n, s) INTUSE(_IO_fread) (p, m, n, s)
48 # define ftell(s) INTUSE(_IO_ftell) (s)
49 # define fwrite(p, m, n, s) INTUSE(_IO_fwrite) (p, m, n, s)
52 static bool_t xdrstdio_getlong (XDR *, long *);
53 static bool_t xdrstdio_putlong (XDR *, const long *);
54 static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
55 static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
56 static u_int xdrstdio_getpos (const XDR *);
57 static bool_t xdrstdio_setpos (XDR *, u_int);
58 static int32_t *xdrstdio_inline (XDR *, u_int);
59 static void xdrstdio_destroy (XDR *);
60 static bool_t xdrstdio_getint32 (XDR *, int32_t *);
61 static bool_t xdrstdio_putint32 (XDR *, const int32_t *);
64 * Ops vector for stdio type XDR
66 static const struct xdr_ops xdrstdio_ops =
68 xdrstdio_getlong, /* deserialize a long int */
69 xdrstdio_putlong, /* serialize a long int */
70 xdrstdio_getbytes, /* deserialize counted bytes */
71 xdrstdio_putbytes, /* serialize counted bytes */
72 xdrstdio_getpos, /* get offset in the stream */
73 xdrstdio_setpos, /* set offset in the stream */
74 xdrstdio_inline, /* prime stream for inline macros */
75 xdrstdio_destroy, /* destroy stream */
76 xdrstdio_getint32, /* deserialize a int */
77 xdrstdio_putint32 /* serialize a int */
81 * Initialize a stdio xdr stream.
82 * Sets the xdr stream handle xdrs for use on the stream file.
83 * Operation flag is set to op.
86 xdrstdio_create (XDR *xdrs, FILE *file, enum xdr_op op)
89 /* We have to add the const since the `struct xdr_ops' in `struct XDR'
91 xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
92 xdrs->x_private = (caddr_t) file;
98 * Destroy a stdio xdr stream.
99 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
102 xdrstdio_destroy (XDR *xdrs)
104 (void) fflush ((FILE *) xdrs->x_private);
105 /* xx should we close the file ?? */
109 xdrstdio_getlong (XDR *xdrs, long *lp)
113 if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
115 *lp = (long) ntohl (mycopy);
120 xdrstdio_putlong (XDR *xdrs, const long *lp)
122 int32_t mycopy = htonl ((u_int32_t) *lp);
124 if (fwrite ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
130 xdrstdio_getbytes (XDR *xdrs, const caddr_t addr, u_int len)
132 if ((len != 0) && (fread (addr, (int) len, 1,
133 (FILE *) xdrs->x_private) != 1))
139 xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len)
141 if ((len != 0) && (fwrite (addr, (int) len, 1,
142 (FILE *) xdrs->x_private) != 1))
148 xdrstdio_getpos (const XDR *xdrs)
150 return (u_int) ftell ((FILE *) xdrs->x_private);
154 xdrstdio_setpos (XDR *xdrs, u_int pos)
156 return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
160 xdrstdio_inline (XDR *xdrs, u_int len)
163 * Must do some work to implement this: must insure
164 * enough data in the underlying stdio buffer,
165 * that the buffer is aligned so that we can indirect through a
166 * long *, and stuff this pointer in xdrs->x_buf. Doing
167 * a fread or fwrite to a scratch buffer would defeat
168 * most of the gains to be had here and require storage
169 * management on this buffer, so we don't do this.
175 xdrstdio_getint32 (XDR *xdrs, int32_t *ip)
179 if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
181 *ip = ntohl (mycopy);
186 xdrstdio_putint32 (XDR *xdrs, const int32_t *ip)
188 int32_t mycopy = htonl (*ip);
191 if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1)
196 /* libc_hidden_def (xdrstdio_create) */