1 | /* |
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2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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3 | * unrestricted use provided that this legend is included on all tape |
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4 | * media and as a part of the software program in whole or part. Users |
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5 | * may copy or modify Sun RPC without charge, but are not authorized |
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6 | * to license or distribute it to anyone else except as part of a product or |
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7 | * program developed by the user. |
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8 | * |
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9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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12 | * |
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13 | * Sun RPC is provided with no support and without any obligation on the |
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14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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15 | * modification or enhancement. |
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16 | * |
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17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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19 | * OR ANY PART THEREOF. |
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20 | * |
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21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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22 | * or profits or other special, indirect and consequential damages, even if |
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23 | * Sun has been advised of the possibility of such damages. |
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24 | * |
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25 | * Sun Microsystems, Inc. |
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26 | * 2550 Garcia Avenue |
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27 | * Mountain View, California 94043 |
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28 | */ |
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29 | |
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30 | #if defined(LIBC_SCCS) && !defined(lint) |
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31 | /*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/ |
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32 | /*static char *sccsid = "from: @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";*/ |
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33 | static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $"; |
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34 | #endif |
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35 | |
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36 | /* |
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37 | * xdr_reference.c, Generic XDR routines impelmentation. |
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38 | * |
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39 | * Copyright (C) 1987, Sun Microsystems, Inc. |
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40 | * |
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41 | * These are the "non-trivial" xdr primitives used to serialize and de-serialize |
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42 | * "pointers". See xdr.h for more info on the interface to xdr. |
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43 | */ |
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44 | |
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45 | #include <stdio.h> |
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46 | #include <stdlib.h> |
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47 | #include <string.h> |
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48 | #include <rpc/types.h> |
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49 | #include <rpc/xdr.h> |
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50 | |
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51 | #define LASTUNSIGNED ((u_int) 0-1) |
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52 | |
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53 | /* |
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54 | * XDR an indirect pointer |
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55 | * xdr_reference is for recursively translating a structure that is |
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56 | * referenced by a pointer inside the structure that is currently being |
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57 | * translated. pp references a pointer to storage. If *pp is null |
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58 | * the necessary storage is allocated. |
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59 | * size is the sizeof the referneced structure. |
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60 | * proc is the routine to handle the referenced structure. |
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61 | */ |
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62 | bool_t |
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63 | xdr_reference(xdrs, pp, size, proc) |
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64 | register XDR *xdrs; |
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65 | caddr_t *pp; /* the pointer to work on */ |
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66 | u_int size; /* size of the object pointed to */ |
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67 | xdrproc_t proc; /* xdr routine to handle the object */ |
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68 | { |
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69 | register caddr_t loc = *pp; |
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70 | register bool_t stat; |
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71 | |
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72 | if (loc == NULL) |
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73 | switch (xdrs->x_op) { |
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74 | case XDR_FREE: |
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75 | return (TRUE); |
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76 | |
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77 | case XDR_DECODE: |
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78 | *pp = loc = (caddr_t) mem_alloc(size); |
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79 | if (loc == NULL) { |
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80 | (void) fprintf(stderr, |
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81 | "xdr_reference: out of memory\n"); |
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82 | return (FALSE); |
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83 | } |
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84 | memset(loc, 0, (int)size); |
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85 | break; |
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86 | case XDR_ENCODE: /* to avoid warning */ |
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87 | break; |
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88 | } |
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89 | |
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90 | stat = (*proc)(xdrs, loc, LASTUNSIGNED); |
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91 | |
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92 | if (xdrs->x_op == XDR_FREE) { |
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93 | mem_free(loc, size); |
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94 | *pp = NULL; |
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95 | } |
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96 | return (stat); |
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97 | } |
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98 | |
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99 | |
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100 | /* |
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101 | * xdr_pointer(): |
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102 | * |
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103 | * XDR a pointer to a possibly recursive data structure. This |
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104 | * differs with xdr_reference in that it can serialize/deserialiaze |
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105 | * trees correctly. |
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106 | * |
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107 | * What's sent is actually a union: |
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108 | * |
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109 | * union object_pointer switch (boolean b) { |
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110 | * case TRUE: object_data data; |
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111 | * case FALSE: void nothing; |
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112 | * } |
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113 | * |
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114 | * > objpp: Pointer to the pointer to the object. |
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115 | * > obj_size: size of the object. |
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116 | * > xdr_obj: routine to XDR an object. |
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117 | * |
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118 | */ |
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119 | bool_t |
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120 | xdr_pointer(xdrs,objpp,obj_size,xdr_obj) |
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121 | register XDR *xdrs; |
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122 | char **objpp; |
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123 | u_int obj_size; |
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124 | xdrproc_t xdr_obj; |
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125 | { |
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126 | |
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127 | bool_t more_data; |
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128 | |
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129 | more_data = (*objpp != NULL); |
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130 | if (! xdr_bool(xdrs,&more_data)) { |
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131 | return (FALSE); |
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132 | } |
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133 | if (! more_data) { |
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134 | *objpp = NULL; |
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135 | return (TRUE); |
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136 | } |
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137 | return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); |
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138 | } |
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