xdr_array.c 4.3 KB

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  1. /* @(#)xdr_array.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. #if 0
  31. static char sccsid[] = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
  32. #endif
  33. /*
  34. * xdr_array.c, Generic XDR routines implementation.
  35. *
  36. * Copyright (C) 1984, Sun Microsystems, Inc.
  37. *
  38. * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  39. * arrays. See xdr.h for more info on the interface to xdr.
  40. */
  41. #define __FORCE_GLIBC
  42. #include <features.h>
  43. #include <stdio.h>
  44. #include <string.h>
  45. #include <rpc/types.h>
  46. #include <rpc/xdr.h>
  47. #include <limits.h>
  48. #ifdef USE_IN_LIBIO
  49. # include <wchar.h>
  50. #endif
  51. #define LASTUNSIGNED ((u_int)0-1)
  52. /*
  53. * XDR an array of arbitrary elements
  54. * *addrp is a pointer to the array, *sizep is the number of elements.
  55. * If addrp is NULL (*sizep * elsize) bytes are allocated.
  56. * elsize is the size (in bytes) of each element, and elproc is the
  57. * xdr procedure to call to handle each element of the array.
  58. */
  59. bool_t
  60. xdr_array (XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc)
  61. {
  62. u_int i;
  63. caddr_t target = *addrp;
  64. u_int c; /* the actual element count */
  65. bool_t stat = TRUE;
  66. u_int nodesize;
  67. /* like strings, arrays are really counted arrays */
  68. if (!xdr_u_int (xdrs, sizep))
  69. {
  70. return FALSE;
  71. }
  72. c = *sizep;
  73. /*
  74. * XXX: Let the overflow possibly happen with XDR_FREE because mem_free()
  75. * doesn't actually use its second argument anyway.
  76. */
  77. if ((c > maxsize || c > UINT_MAX / elsize) && (xdrs->x_op != XDR_FREE))
  78. {
  79. return FALSE;
  80. }
  81. nodesize = c * elsize;
  82. /*
  83. * if we are deserializing, we may need to allocate an array.
  84. * We also save time by checking for a null array if we are freeing.
  85. */
  86. if (target == NULL)
  87. switch (xdrs->x_op)
  88. {
  89. case XDR_DECODE:
  90. if (c == 0)
  91. return TRUE;
  92. *addrp = target = mem_alloc (nodesize);
  93. if (target == NULL)
  94. {
  95. #ifdef USE_IN_LIBIO
  96. if (_IO_fwide (stderr, 0) > 0)
  97. (void) fwprintf (stderr, L"%s",
  98. _("xdr_array: out of memory\n"));
  99. else
  100. #endif
  101. (void) fputs (_("xdr_array: out of memory\n"), stderr);
  102. return FALSE;
  103. }
  104. memset (target, 0, nodesize);
  105. break;
  106. case XDR_FREE:
  107. return TRUE;
  108. default:
  109. break;
  110. }
  111. /*
  112. * now we xdr each element of array
  113. */
  114. for (i = 0; (i < c) && stat; i++)
  115. {
  116. stat = (*elproc) (xdrs, target, LASTUNSIGNED);
  117. target += elsize;
  118. }
  119. /*
  120. * the array may need freeing
  121. */
  122. if (xdrs->x_op == XDR_FREE)
  123. {
  124. mem_free (*addrp, nodesize);
  125. *addrp = NULL;
  126. }
  127. return stat;
  128. }
  129. libc_hidden_def(xdr_array)
  130. /*
  131. * xdr_vector():
  132. *
  133. * XDR a fixed length array. Unlike variable-length arrays,
  134. * the storage of fixed length arrays is static and unfreeable.
  135. * > basep: base of the array
  136. * > size: size of the array
  137. * > elemsize: size of each element
  138. * > xdr_elem: routine to XDR each element
  139. */
  140. bool_t
  141. xdr_vector (XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
  142. xdrproc_t xdr_elem)
  143. {
  144. u_int i;
  145. char *elptr;
  146. elptr = basep;
  147. for (i = 0; i < nelem; i++)
  148. {
  149. if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))
  150. {
  151. return FALSE;
  152. }
  153. elptr += elemsize;
  154. }
  155. return TRUE;
  156. }