1 | /* @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC */ |
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2 | /* |
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3 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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4 | * unrestricted use provided that this legend is included on all tape |
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5 | * media and as a part of the software program in whole or part. Users |
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6 | * may copy or modify Sun RPC without charge, but are not authorized |
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7 | * to license or distribute it to anyone else except as part of a product or |
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8 | * program developed by the user. |
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9 | * |
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10 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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11 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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12 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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13 | * |
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14 | * Sun RPC is provided with no support and without any obligation on the |
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15 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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16 | * modification or enhancement. |
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17 | * |
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18 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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19 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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20 | * OR ANY PART THEREOF. |
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21 | * |
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22 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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23 | * or profits or other special, indirect and consequential damages, even if |
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24 | * Sun has been advised of the possibility of such damages. |
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25 | * |
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26 | * Sun Microsystems, Inc. |
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27 | * 2550 Garcia Avenue |
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28 | * Mountain View, California 94043 |
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29 | */ |
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30 | #if !defined(lint) && defined(SCCSIDS) |
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31 | static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro"; |
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32 | #endif |
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33 | |
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34 | /* |
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35 | * xdr_mem.h, XDR implementation using memory buffers. |
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36 | * |
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37 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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38 | * |
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39 | * If you have some data to be interpreted as external data representation |
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40 | * or to be converted to external data representation in a memory buffer, |
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41 | * then this is the package for you. |
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42 | * |
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43 | */ |
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44 | |
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45 | |
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46 | #include <string.h> /* bcopy */ |
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47 | #include <rpc/types.h> |
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48 | #include <rpc/xdr.h> |
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49 | #include <netinet/in.h> |
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50 | |
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51 | static bool_t xdrmem_getlong(); |
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52 | static bool_t xdrmem_putlong(); |
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53 | static bool_t xdrmem_getbytes(); |
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54 | static bool_t xdrmem_putbytes(); |
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55 | static u_int xdrmem_getpos(); |
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56 | static bool_t xdrmem_setpos(); |
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57 | static long * xdrmem_inline(); |
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58 | static void xdrmem_destroy(); |
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59 | |
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60 | static struct xdr_ops xdrmem_ops = { |
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61 | xdrmem_getlong, |
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62 | xdrmem_putlong, |
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63 | xdrmem_getbytes, |
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64 | xdrmem_putbytes, |
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65 | xdrmem_getpos, |
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66 | xdrmem_setpos, |
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67 | xdrmem_inline, |
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68 | xdrmem_destroy |
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69 | }; |
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70 | |
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71 | /* |
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72 | * The procedure xdrmem_create initializes a stream descriptor for a |
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73 | * memory buffer. |
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74 | */ |
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75 | void |
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76 | xdrmem_create(xdrs, addr, size, op) |
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77 | register XDR *xdrs; |
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78 | caddr_t addr; |
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79 | u_int size; |
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80 | enum xdr_op op; |
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81 | { |
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82 | |
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83 | xdrs->x_op = op; |
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84 | xdrs->x_ops = &xdrmem_ops; |
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85 | xdrs->x_private = xdrs->x_base = addr; |
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86 | xdrs->x_handy = size; |
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87 | } |
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88 | |
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89 | static void |
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90 | xdrmem_destroy(/*xdrs*/) |
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91 | /*XDR *xdrs;*/ |
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92 | { |
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93 | } |
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94 | |
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95 | static bool_t |
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96 | xdrmem_getlong(xdrs, lp) |
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97 | register XDR *xdrs; |
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98 | long *lp; |
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99 | { |
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100 | |
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101 | if ((xdrs->x_handy -= sizeof(long)) < 0) |
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102 | return (FALSE); |
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103 | *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private)))); |
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104 | xdrs->x_private += sizeof(long); |
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105 | return (TRUE); |
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106 | } |
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107 | |
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108 | static bool_t |
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109 | xdrmem_putlong(xdrs, lp) |
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110 | register XDR *xdrs; |
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111 | long *lp; |
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112 | { |
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113 | |
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114 | if ((xdrs->x_handy -= sizeof(long)) < 0) |
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115 | return (FALSE); |
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116 | *(long *)xdrs->x_private = (long)htonl((u_long)(*lp)); |
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117 | xdrs->x_private += sizeof(long); |
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118 | return (TRUE); |
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119 | } |
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120 | |
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121 | static bool_t |
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122 | xdrmem_getbytes(xdrs, addr, len) |
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123 | register XDR *xdrs; |
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124 | caddr_t addr; |
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125 | register u_int len; |
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126 | { |
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127 | |
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128 | if ((xdrs->x_handy -= len) < 0) |
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129 | return (FALSE); |
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130 | bcopy(xdrs->x_private, addr, len); |
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131 | xdrs->x_private += len; |
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132 | return (TRUE); |
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133 | } |
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134 | |
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135 | static bool_t |
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136 | xdrmem_putbytes(xdrs, addr, len) |
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137 | register XDR *xdrs; |
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138 | caddr_t addr; |
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139 | register u_int len; |
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140 | { |
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141 | |
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142 | if ((xdrs->x_handy -= len) < 0) |
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143 | return (FALSE); |
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144 | bcopy(addr, xdrs->x_private, len); |
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145 | xdrs->x_private += len; |
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146 | return (TRUE); |
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147 | } |
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148 | |
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149 | static u_int |
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150 | xdrmem_getpos(xdrs) |
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151 | register XDR *xdrs; |
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152 | { |
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153 | |
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154 | return ((u_int)xdrs->x_private - (u_int)xdrs->x_base); |
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155 | } |
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156 | |
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157 | static bool_t |
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158 | xdrmem_setpos(xdrs, pos) |
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159 | register XDR *xdrs; |
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160 | u_int pos; |
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161 | { |
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162 | register caddr_t newaddr = xdrs->x_base + pos; |
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163 | register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; |
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164 | |
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165 | if ((long)newaddr > (long)lastaddr) |
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166 | return (FALSE); |
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167 | xdrs->x_private = newaddr; |
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168 | xdrs->x_handy = (int)lastaddr - (int)newaddr; |
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169 | return (TRUE); |
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170 | } |
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171 | |
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172 | static long * |
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173 | xdrmem_inline(xdrs, len) |
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174 | register XDR *xdrs; |
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175 | int len; |
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176 | { |
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177 | long *buf = 0; |
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178 | |
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179 | if (xdrs->x_handy >= len) { |
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180 | xdrs->x_handy -= len; |
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181 | buf = (long *) xdrs->x_private; |
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182 | xdrs->x_private += len; |
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183 | } |
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184 | return (buf); |
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185 | } |
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