author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 19 Aug 2010 11:33:45 +0300 | |
branch | RCL_3 |
changeset 54 | 4332f0f7be53 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* © Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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* Copyright (c) 1996 by Internet Software Consortium. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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* SOFTWARE. |
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*/ |
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|
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#if defined(LIBC_SCCS) && !defined(lint) |
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static char rcsid[] = "$Id: inet_ntop.c,v 1.1.2.1.2.4 2006/11/23 11:59:59 sivanand Exp $"; |
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#endif /* LIBC_SCCS and not lint */ |
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#include <sys/cdefs.h> |
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#ifndef __SYMBIAN32__ |
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__FBSDID("$FreeBSD: src/lib/libc/net/inet_ntop.c,v 1.12 2002/09/06 11:23:49 tjr Exp $"); |
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#endif//__SYMBIAN32__ |
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#include <sys/param.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <stdapis/netinet/in.h> |
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#include <stdapis/arpa/inet.h> |
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#include <stdapis/arpa/nameser.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <string.h> |
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/* |
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* WARNING: Don't even consider trying to compile this on a system where |
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* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
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*/ |
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|
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static const char *inet_ntop4(const u_char *src, char *dst, socklen_t size); |
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static const char *inet_ntop6(const u_char *src, char *dst, socklen_t size); |
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|
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/* char * |
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* inet_ntop(af, src, dst, size) |
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* convert a network format address to presentation format. |
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* return: |
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* pointer to presentation format address (`dst'), or NULL (see errno). |
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* author: |
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* Paul Vixie, 1996. |
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*/ |
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EXPORT_C const char * |
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inet_ntop(int af, const void * __restrict src, char * __restrict dst, |
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socklen_t size) |
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{ |
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switch (af) { |
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case AF_INET: |
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return (inet_ntop4(src, dst, size)); |
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case AF_INET6: |
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return (inet_ntop6(src, dst, size)); |
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default: |
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errno = EAFNOSUPPORT; |
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return (NULL); |
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} |
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/* NOTREACHED */ |
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} |
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|
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/* const char * |
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* inet_ntop4(src, dst, size) |
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* format an IPv4 address, more or less like inet_ntoa() |
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* return: |
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* `dst' (as a const) |
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* notes: |
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* (1) uses no statics |
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* (2) takes a u_char* not an in_addr as input |
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* author: |
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* Paul Vixie, 1996. |
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*/ |
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static const char * |
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inet_ntop4(const u_char *src, char *dst, socklen_t size) |
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{ |
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static const char fmt[] = "%u.%u.%u.%u"; |
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|
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if ((socklen_t)snprintf(dst, size, fmt, src[0], src[1], src[2], src[3]) |
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>= size) { |
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errno = ENOSPC; |
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return (NULL); |
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} |
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return (dst); |
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} |
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|
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/* const char * |
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* inet_ntop6(src, dst, size) |
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* convert IPv6 binary address into presentation (printable) format |
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* author: |
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* Paul Vixie, 1996. |
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*/ |
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static const char * |
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inet_ntop6(const u_char *src, char *dst, socklen_t size) |
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{ |
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/* |
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* Note that int32_t and int16_t need only be "at least" large enough |
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102 |
* to contain a value of the specified size. On some systems, like |
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103 |
* Crays, there is no such thing as an integer variable with 16 bits. |
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104 |
* Keep this in mind if you think this function should have been coded |
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105 |
* to use pointer overlays. All the world's not a VAX. |
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106 |
*/ |
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107 |
char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; |
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108 |
struct { int base, len; } best, cur; |
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109 |
u_int words[NS_IN6ADDRSZ / NS_INT16SZ]; |
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110 |
int i; |
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111 |
|
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112 |
/* |
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113 |
* Preprocess: |
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114 |
* Copy the input (bytewise) array into a wordwise array. |
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* Find the longest run of 0x00's in src[] for :: shorthanding. |
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116 |
*/ |
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117 |
memset(words, '\0', sizeof words); |
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118 |
for (i = 0; i < NS_IN6ADDRSZ; i++) |
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119 |
words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); |
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120 |
best.base = -1; |
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121 |
cur.base = -1; |
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { |
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123 |
if (words[i] == 0) { |
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124 |
if (cur.base == -1) |
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125 |
cur.base = i, cur.len = 1; |
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126 |
else |
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127 |
cur.len++; |
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128 |
} else { |
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129 |
if (cur.base != -1) { |
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130 |
if (best.base == -1 || cur.len > best.len) |
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131 |
best = cur; |
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132 |
cur.base = -1; |
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133 |
} |
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134 |
} |
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135 |
} |
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136 |
if (cur.base != -1) { |
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137 |
if (best.base == -1 || cur.len > best.len) |
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138 |
best = cur; |
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139 |
} |
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140 |
if (best.base != -1 && best.len < 2) |
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141 |
best.base = -1; |
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142 |
|
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143 |
/* |
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144 |
* Format the result. |
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145 |
*/ |
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146 |
tp = tmp; |
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147 |
for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { |
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148 |
/* Are we inside the best run of 0x00's? */ |
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149 |
if (best.base != -1 && i >= best.base && |
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150 |
i < (best.base + best.len)) { |
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151 |
if (i == best.base) |
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152 |
*tp++ = ':'; |
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153 |
continue; |
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154 |
} |
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155 |
/* Are we following an initial run of 0x00s or any real hex? */ |
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156 |
if (i != 0) |
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157 |
*tp++ = ':'; |
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158 |
/* Is this address an encapsulated IPv4? */ |
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159 |
if (i == 6 && best.base == 0 && |
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160 |
(best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { |
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161 |
if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) |
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162 |
return (NULL); |
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163 |
tp += strlen(tp); |
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164 |
break; |
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165 |
} |
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166 |
tp += sprintf(tp, "%x", words[i]); |
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167 |
} |
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168 |
/* Was it a trailing run of 0x00's? */ |
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169 |
if (best.base != -1 && (best.base + best.len) == |
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170 |
(NS_IN6ADDRSZ / NS_INT16SZ)) |
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171 |
*tp++ = ':'; |
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172 |
*tp++ = '\0'; |
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173 |
|
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174 |
/* |
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175 |
* Check for overflow, copy, and we're done. |
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176 |
*/ |
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177 |
if ((socklen_t)(tp - tmp) > size) { |
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178 |
errno = ENOSPC; |
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179 |
return (NULL); |
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180 |
} |
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181 |
strcpy(dst, tmp); |
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182 |
return (dst); |
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183 |
} |
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184 |
|
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185 |
/* |
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186 |
* Weak aliases for applications that use certain private entry points, |
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187 |
* and fail to include <arpa/inet.h>. |
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188 |
*/ |
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189 |
#ifndef __SYMBIAN32__ |
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190 |
#undef inet_ntop |
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191 |
__weak_reference(__inet_ntop, inet_ntop); |
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192 |
#else |
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193 |
#define inet_ntop __inet_ntop |
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194 |
#endif//__SYMBIAN32__ |