xdr_reference.c 3.6 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130
  1. /* @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC */
  2. /*
  3. * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  4. * unrestricted use provided that this legend is included on all tape
  5. * media and as a part of the software program in whole or part. Users
  6. * may copy or modify Sun RPC without charge, but are not authorized
  7. * to license or distribute it to anyone else except as part of a product or
  8. * program developed by the user.
  9. *
  10. * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11. * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12. * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13. *
  14. * Sun RPC is provided with no support and without any obligation on the
  15. * part of Sun Microsystems, Inc. to assist in its use, correction,
  16. * modification or enhancement.
  17. *
  18. * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19. * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20. * OR ANY PART THEREOF.
  21. *
  22. * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23. * or profits or other special, indirect and consequential damages, even if
  24. * Sun has been advised of the possibility of such damages.
  25. *
  26. * Sun Microsystems, Inc.
  27. * 2550 Garcia Avenue
  28. * Mountain View, California 94043
  29. */
  30. #define __FORCE_GLIBC
  31. #include <features.h>
  32. /*
  33. * xdr_reference.c, Generic XDR routines impelmentation.
  34. *
  35. * Copyright (C) 1987, Sun Microsystems, Inc.
  36. *
  37. * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  38. * "pointers". See xdr.h for more info on the interface to xdr.
  39. */
  40. #include <stdio.h>
  41. #include <string.h>
  42. #include <rpc/types.h>
  43. #include <rpc/xdr.h>
  44. #define LASTUNSIGNED ((u_int)0-1)
  45. /*
  46. * XDR an indirect pointer
  47. * xdr_reference is for recursively translating a structure that is
  48. * referenced by a pointer inside the structure that is currently being
  49. * translated. pp references a pointer to storage. If *pp is null
  50. * the necessary storage is allocated.
  51. * size is the sizeof the referneced structure.
  52. * proc is the routine to handle the referenced structure.
  53. */
  54. bool_t xdr_reference(xdrs, pp, size, proc)
  55. register XDR *xdrs;
  56. caddr_t *pp; /* the pointer to work on */
  57. u_int size; /* size of the object pointed to */
  58. xdrproc_t proc; /* xdr routine to handle the object */
  59. {
  60. register caddr_t loc = *pp;
  61. register bool_t stat;
  62. if (loc == NULL)
  63. switch (xdrs->x_op) {
  64. case XDR_FREE:
  65. return (TRUE);
  66. case XDR_DECODE:
  67. *pp = loc = (caddr_t) mem_alloc(size);
  68. if (loc == NULL) {
  69. (void) fprintf(stderr, "xdr_reference: out of memory\n");
  70. return (FALSE);
  71. }
  72. bzero(loc, (int) size);
  73. break;
  74. default: /* silence the warnings */
  75. }
  76. stat = (*proc) (xdrs, loc, LASTUNSIGNED);
  77. if (xdrs->x_op == XDR_FREE) {
  78. mem_free(loc, size);
  79. *pp = NULL;
  80. }
  81. return (stat);
  82. }
  83. /*
  84. * xdr_pointer():
  85. *
  86. * XDR a pointer to a possibly recursive data structure. This
  87. * differs with xdr_reference in that it can serialize/deserialiaze
  88. * trees correctly.
  89. *
  90. * What's sent is actually a union:
  91. *
  92. * union object_pointer switch (boolean b) {
  93. * case TRUE: object_data data;
  94. * case FALSE: void nothing;
  95. * }
  96. *
  97. * > objpp: Pointer to the pointer to the object.
  98. * > obj_size: size of the object.
  99. * > xdr_obj: routine to XDR an object.
  100. *
  101. */
  102. bool_t xdr_pointer(xdrs, objpp, obj_size, xdr_obj)
  103. register XDR *xdrs;
  104. char **objpp;
  105. u_int obj_size;
  106. xdrproc_t xdr_obj;
  107. {
  108. bool_t more_data;
  109. more_data = (*objpp != NULL);
  110. if (!xdr_bool(xdrs, &more_data)) {
  111. return (FALSE);
  112. }
  113. if (!more_data) {
  114. *objpp = NULL;
  115. return (TRUE);
  116. }
  117. return (xdr_reference(xdrs, objpp, obj_size, xdr_obj));
  118. }