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1 | e4d5639d | Amit Shah | /*
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2 | e4d5639d | Amit Shah | * Helpers for getting linearized buffers from iov / filling buffers into iovs
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3 | e4d5639d | Amit Shah | *
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4 | e4d5639d | Amit Shah | * Copyright IBM, Corp. 2007, 2008
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5 | e4d5639d | Amit Shah | * Copyright (C) 2010 Red Hat, Inc.
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6 | e4d5639d | Amit Shah | *
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7 | e4d5639d | Amit Shah | * Author(s):
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8 | e4d5639d | Amit Shah | * Anthony Liguori <aliguori@us.ibm.com>
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9 | e4d5639d | Amit Shah | * Amit Shah <amit.shah@redhat.com>
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10 | 2278a69e | Michael Tokarev | * Michael Tokarev <mjt@tls.msk.ru>
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11 | e4d5639d | Amit Shah | *
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12 | e4d5639d | Amit Shah | * This work is licensed under the terms of the GNU GPL, version 2. See
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13 | e4d5639d | Amit Shah | * the COPYING file in the top-level directory.
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14 | 6b620ca3 | Paolo Bonzini | *
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15 | 6b620ca3 | Paolo Bonzini | * Contributions after 2012-01-13 are licensed under the terms of the
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16 | 6b620ca3 | Paolo Bonzini | * GNU GPL, version 2 or (at your option) any later version.
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17 | e4d5639d | Amit Shah | */
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18 | e4d5639d | Amit Shah | |
19 | 1de7afc9 | Paolo Bonzini | #include "qemu/iov.h" |
20 | e4d5639d | Amit Shah | |
21 | 25e5e4c7 | Michael Tokarev | #ifdef _WIN32
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22 | 25e5e4c7 | Michael Tokarev | # include <windows.h> |
23 | 25e5e4c7 | Michael Tokarev | # include <winsock2.h> |
24 | 25e5e4c7 | Michael Tokarev | #else
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25 | 25e5e4c7 | Michael Tokarev | # include <sys/types.h> |
26 | 25e5e4c7 | Michael Tokarev | # include <sys/socket.h> |
27 | 25e5e4c7 | Michael Tokarev | #endif
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28 | 25e5e4c7 | Michael Tokarev | |
29 | 844b5cea | Michael S. Tsirkin | size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt, |
30 | 2278a69e | Michael Tokarev | size_t offset, const void *buf, size_t bytes) |
31 | e4d5639d | Amit Shah | { |
32 | 2278a69e | Michael Tokarev | size_t done; |
33 | e4d5639d | Amit Shah | unsigned int i; |
34 | 2278a69e | Michael Tokarev | for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) { |
35 | 2278a69e | Michael Tokarev | if (offset < iov[i].iov_len) {
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36 | 2278a69e | Michael Tokarev | size_t len = MIN(iov[i].iov_len - offset, bytes - done); |
37 | 2278a69e | Michael Tokarev | memcpy(iov[i].iov_base + offset, buf + done, len); |
38 | 2278a69e | Michael Tokarev | done += len; |
39 | 2278a69e | Michael Tokarev | offset = 0;
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40 | 2278a69e | Michael Tokarev | } else {
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41 | 2278a69e | Michael Tokarev | offset -= iov[i].iov_len; |
42 | 348e7b8d | Hannes Reinecke | } |
43 | e4d5639d | Amit Shah | } |
44 | 2278a69e | Michael Tokarev | assert(offset == 0);
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45 | 2278a69e | Michael Tokarev | return done;
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46 | e4d5639d | Amit Shah | } |
47 | fa6111f2 | Amit Shah | |
48 | 2278a69e | Michael Tokarev | size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt, |
49 | 2278a69e | Michael Tokarev | size_t offset, void *buf, size_t bytes)
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50 | fa6111f2 | Amit Shah | { |
51 | 2278a69e | Michael Tokarev | size_t done; |
52 | fa6111f2 | Amit Shah | unsigned int i; |
53 | 2278a69e | Michael Tokarev | for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) { |
54 | 2278a69e | Michael Tokarev | if (offset < iov[i].iov_len) {
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55 | 2278a69e | Michael Tokarev | size_t len = MIN(iov[i].iov_len - offset, bytes - done); |
56 | 2278a69e | Michael Tokarev | memcpy(buf + done, iov[i].iov_base + offset, len); |
57 | 2278a69e | Michael Tokarev | done += len; |
58 | 2278a69e | Michael Tokarev | offset = 0;
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59 | 2278a69e | Michael Tokarev | } else {
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60 | 2278a69e | Michael Tokarev | offset -= iov[i].iov_len; |
61 | fa6111f2 | Amit Shah | } |
62 | 8d15028e | Gerd Hoffmann | } |
63 | 2278a69e | Michael Tokarev | assert(offset == 0);
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64 | 2278a69e | Michael Tokarev | return done;
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65 | 8d15028e | Gerd Hoffmann | } |
66 | 8d15028e | Gerd Hoffmann | |
67 | dcf6f5e1 | Michael Tokarev | size_t iov_memset(const struct iovec *iov, const unsigned int iov_cnt, |
68 | 2278a69e | Michael Tokarev | size_t offset, int fillc, size_t bytes)
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69 | 8d15028e | Gerd Hoffmann | { |
70 | 2278a69e | Michael Tokarev | size_t done; |
71 | 8d15028e | Gerd Hoffmann | unsigned int i; |
72 | 2278a69e | Michael Tokarev | for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) { |
73 | 2278a69e | Michael Tokarev | if (offset < iov[i].iov_len) {
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74 | 2278a69e | Michael Tokarev | size_t len = MIN(iov[i].iov_len - offset, bytes - done); |
75 | 2278a69e | Michael Tokarev | memset(iov[i].iov_base + offset, fillc, len); |
76 | 2278a69e | Michael Tokarev | done += len; |
77 | 2278a69e | Michael Tokarev | offset = 0;
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78 | 2278a69e | Michael Tokarev | } else {
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79 | 2278a69e | Michael Tokarev | offset -= iov[i].iov_len; |
80 | 8d15028e | Gerd Hoffmann | } |
81 | fa6111f2 | Amit Shah | } |
82 | 2278a69e | Michael Tokarev | assert(offset == 0);
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83 | 2278a69e | Michael Tokarev | return done;
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84 | fa6111f2 | Amit Shah | } |
85 | fa6111f2 | Amit Shah | |
86 | 348e7b8d | Hannes Reinecke | size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt) |
87 | fa6111f2 | Amit Shah | { |
88 | fa6111f2 | Amit Shah | size_t len; |
89 | fa6111f2 | Amit Shah | unsigned int i; |
90 | fa6111f2 | Amit Shah | |
91 | fa6111f2 | Amit Shah | len = 0;
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92 | 348e7b8d | Hannes Reinecke | for (i = 0; i < iov_cnt; i++) { |
93 | fa6111f2 | Amit Shah | len += iov[i].iov_len; |
94 | fa6111f2 | Amit Shah | } |
95 | fa6111f2 | Amit Shah | return len;
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96 | fa6111f2 | Amit Shah | } |
97 | 3a1dca94 | Gerd Hoffmann | |
98 | 25e5e4c7 | Michael Tokarev | /* helper function for iov_send_recv() */
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99 | 25e5e4c7 | Michael Tokarev | static ssize_t
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100 | 25e5e4c7 | Michael Tokarev | do_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt, bool do_send) |
101 | 25e5e4c7 | Michael Tokarev | { |
102 | 25e5e4c7 | Michael Tokarev | #if defined CONFIG_IOVEC && defined CONFIG_POSIX
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103 | 25e5e4c7 | Michael Tokarev | ssize_t ret; |
104 | 25e5e4c7 | Michael Tokarev | struct msghdr msg;
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105 | 25e5e4c7 | Michael Tokarev | memset(&msg, 0, sizeof(msg)); |
106 | 25e5e4c7 | Michael Tokarev | msg.msg_iov = iov; |
107 | 25e5e4c7 | Michael Tokarev | msg.msg_iovlen = iov_cnt; |
108 | 25e5e4c7 | Michael Tokarev | do {
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109 | 25e5e4c7 | Michael Tokarev | ret = do_send |
110 | 25e5e4c7 | Michael Tokarev | ? sendmsg(sockfd, &msg, 0)
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111 | 25e5e4c7 | Michael Tokarev | : recvmsg(sockfd, &msg, 0);
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112 | 25e5e4c7 | Michael Tokarev | } while (ret < 0 && errno == EINTR); |
113 | 25e5e4c7 | Michael Tokarev | return ret;
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114 | 25e5e4c7 | Michael Tokarev | #else
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115 | 25e5e4c7 | Michael Tokarev | /* else send piece-by-piece */
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116 | 25e5e4c7 | Michael Tokarev | /*XXX Note: windows has WSASend() and WSARecv() */
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117 | c0958559 | Stefan Weil | unsigned i = 0; |
118 | c0958559 | Stefan Weil | ssize_t ret = 0;
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119 | c0958559 | Stefan Weil | while (i < iov_cnt) {
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120 | 25e5e4c7 | Michael Tokarev | ssize_t r = do_send |
121 | 25e5e4c7 | Michael Tokarev | ? send(sockfd, iov[i].iov_base, iov[i].iov_len, 0)
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122 | 25e5e4c7 | Michael Tokarev | : recv(sockfd, iov[i].iov_base, iov[i].iov_len, 0);
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123 | 25e5e4c7 | Michael Tokarev | if (r > 0) { |
124 | 25e5e4c7 | Michael Tokarev | ret += r; |
125 | 25e5e4c7 | Michael Tokarev | } else if (!r) { |
126 | 25e5e4c7 | Michael Tokarev | break;
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127 | 25e5e4c7 | Michael Tokarev | } else if (errno == EINTR) { |
128 | 25e5e4c7 | Michael Tokarev | continue;
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129 | 25e5e4c7 | Michael Tokarev | } else {
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130 | 25e5e4c7 | Michael Tokarev | /* else it is some "other" error,
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131 | 25e5e4c7 | Michael Tokarev | * only return if there was no data processed. */
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132 | 25e5e4c7 | Michael Tokarev | if (ret == 0) { |
133 | c0958559 | Stefan Weil | ret = -1;
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134 | 25e5e4c7 | Michael Tokarev | } |
135 | 25e5e4c7 | Michael Tokarev | break;
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136 | 25e5e4c7 | Michael Tokarev | } |
137 | c0958559 | Stefan Weil | i++; |
138 | 25e5e4c7 | Michael Tokarev | } |
139 | c0958559 | Stefan Weil | return ret;
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140 | 25e5e4c7 | Michael Tokarev | #endif
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141 | 25e5e4c7 | Michael Tokarev | } |
142 | 25e5e4c7 | Michael Tokarev | |
143 | 25e5e4c7 | Michael Tokarev | ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt, |
144 | 25e5e4c7 | Michael Tokarev | size_t offset, size_t bytes, |
145 | 25e5e4c7 | Michael Tokarev | bool do_send)
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146 | 25e5e4c7 | Michael Tokarev | { |
147 | 25e5e4c7 | Michael Tokarev | ssize_t ret; |
148 | 25e5e4c7 | Michael Tokarev | unsigned si, ei; /* start and end indexes */ |
149 | bb955867 | Peter Maydell | if (bytes == 0) { |
150 | bb955867 | Peter Maydell | /* Catch the do-nothing case early, as otherwise we will pass an
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151 | bb955867 | Peter Maydell | * empty iovec to sendmsg/recvmsg(), and not all implementations
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152 | bb955867 | Peter Maydell | * accept this.
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153 | bb955867 | Peter Maydell | */
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154 | bb955867 | Peter Maydell | return 0; |
155 | bb955867 | Peter Maydell | } |
156 | 25e5e4c7 | Michael Tokarev | |
157 | 25e5e4c7 | Michael Tokarev | /* Find the start position, skipping `offset' bytes:
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158 | 25e5e4c7 | Michael Tokarev | * first, skip all full-sized vector elements, */
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159 | 25e5e4c7 | Michael Tokarev | for (si = 0; si < iov_cnt && offset >= iov[si].iov_len; ++si) { |
160 | 25e5e4c7 | Michael Tokarev | offset -= iov[si].iov_len; |
161 | 25e5e4c7 | Michael Tokarev | } |
162 | 25e5e4c7 | Michael Tokarev | if (offset) {
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163 | 25e5e4c7 | Michael Tokarev | assert(si < iov_cnt); |
164 | 25e5e4c7 | Michael Tokarev | /* second, skip `offset' bytes from the (now) first element,
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165 | 25e5e4c7 | Michael Tokarev | * undo it on exit */
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166 | 25e5e4c7 | Michael Tokarev | iov[si].iov_base += offset; |
167 | 25e5e4c7 | Michael Tokarev | iov[si].iov_len -= offset; |
168 | 25e5e4c7 | Michael Tokarev | } |
169 | 25e5e4c7 | Michael Tokarev | /* Find the end position skipping `bytes' bytes: */
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170 | 25e5e4c7 | Michael Tokarev | /* first, skip all full-sized elements */
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171 | 25e5e4c7 | Michael Tokarev | for (ei = si; ei < iov_cnt && iov[ei].iov_len <= bytes; ++ei) {
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172 | 25e5e4c7 | Michael Tokarev | bytes -= iov[ei].iov_len; |
173 | 25e5e4c7 | Michael Tokarev | } |
174 | 25e5e4c7 | Michael Tokarev | if (bytes) {
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175 | 25e5e4c7 | Michael Tokarev | /* second, fixup the last element, and remember
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176 | 25e5e4c7 | Michael Tokarev | * the length we've cut from the end of it in `bytes' */
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177 | 25e5e4c7 | Michael Tokarev | size_t tail; |
178 | 25e5e4c7 | Michael Tokarev | assert(ei < iov_cnt); |
179 | 25e5e4c7 | Michael Tokarev | assert(iov[ei].iov_len > bytes); |
180 | 25e5e4c7 | Michael Tokarev | tail = iov[ei].iov_len - bytes; |
181 | 25e5e4c7 | Michael Tokarev | iov[ei].iov_len = bytes; |
182 | 25e5e4c7 | Michael Tokarev | bytes = tail; /* bytes is now equal to the tail size */
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183 | 25e5e4c7 | Michael Tokarev | ++ei; |
184 | 25e5e4c7 | Michael Tokarev | } |
185 | 25e5e4c7 | Michael Tokarev | |
186 | 25e5e4c7 | Michael Tokarev | ret = do_send_recv(sockfd, iov + si, ei - si, do_send); |
187 | 25e5e4c7 | Michael Tokarev | |
188 | 25e5e4c7 | Michael Tokarev | /* Undo the changes above */
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189 | 25e5e4c7 | Michael Tokarev | if (offset) {
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190 | 25e5e4c7 | Michael Tokarev | iov[si].iov_base -= offset; |
191 | 25e5e4c7 | Michael Tokarev | iov[si].iov_len += offset; |
192 | 25e5e4c7 | Michael Tokarev | } |
193 | 25e5e4c7 | Michael Tokarev | if (bytes) {
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194 | 25e5e4c7 | Michael Tokarev | iov[ei-1].iov_len += bytes;
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195 | 25e5e4c7 | Michael Tokarev | } |
196 | 25e5e4c7 | Michael Tokarev | |
197 | 25e5e4c7 | Michael Tokarev | return ret;
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198 | 25e5e4c7 | Michael Tokarev | } |
199 | 25e5e4c7 | Michael Tokarev | |
200 | 25e5e4c7 | Michael Tokarev | |
201 | 3a1dca94 | Gerd Hoffmann | void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt, |
202 | 3a1dca94 | Gerd Hoffmann | FILE *fp, const char *prefix, size_t limit) |
203 | 3a1dca94 | Gerd Hoffmann | { |
204 | 3a1dca94 | Gerd Hoffmann | unsigned int i, v, b; |
205 | 3a1dca94 | Gerd Hoffmann | uint8_t *c; |
206 | 3a1dca94 | Gerd Hoffmann | |
207 | 3a1dca94 | Gerd Hoffmann | c = iov[0].iov_base;
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208 | 3a1dca94 | Gerd Hoffmann | for (i = 0, v = 0, b = 0; b < limit; i++, b++) { |
209 | 3a1dca94 | Gerd Hoffmann | if (i == iov[v].iov_len) {
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210 | 3a1dca94 | Gerd Hoffmann | i = 0; v++;
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211 | 3a1dca94 | Gerd Hoffmann | if (v == iov_cnt) {
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212 | 3a1dca94 | Gerd Hoffmann | break;
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213 | 3a1dca94 | Gerd Hoffmann | } |
214 | 3a1dca94 | Gerd Hoffmann | c = iov[v].iov_base; |
215 | 3a1dca94 | Gerd Hoffmann | } |
216 | 3a1dca94 | Gerd Hoffmann | if ((b % 16) == 0) { |
217 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, "%s: %04x:", prefix, b);
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218 | 3a1dca94 | Gerd Hoffmann | } |
219 | 3a1dca94 | Gerd Hoffmann | if ((b % 4) == 0) { |
220 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, " ");
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221 | 3a1dca94 | Gerd Hoffmann | } |
222 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, " %02x", c[i]);
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223 | 3a1dca94 | Gerd Hoffmann | if ((b % 16) == 15) { |
224 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, "\n");
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225 | 3a1dca94 | Gerd Hoffmann | } |
226 | 3a1dca94 | Gerd Hoffmann | } |
227 | 3a1dca94 | Gerd Hoffmann | if ((b % 16) != 0) { |
228 | 3a1dca94 | Gerd Hoffmann | fprintf(fp, "\n");
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229 | 3a1dca94 | Gerd Hoffmann | } |
230 | 3a1dca94 | Gerd Hoffmann | } |
231 | 0191253c | Paolo Bonzini | |
232 | d336336c | Michael S. Tsirkin | unsigned iov_copy(struct iovec *dst_iov, unsigned int dst_iov_cnt, |
233 | d336336c | Michael S. Tsirkin | const struct iovec *iov, unsigned int iov_cnt, |
234 | d336336c | Michael S. Tsirkin | size_t offset, size_t bytes) |
235 | d336336c | Michael S. Tsirkin | { |
236 | d336336c | Michael S. Tsirkin | size_t len; |
237 | d336336c | Michael S. Tsirkin | unsigned int i, j; |
238 | d336336c | Michael S. Tsirkin | for (i = 0, j = 0; i < iov_cnt && j < dst_iov_cnt && bytes; i++) { |
239 | d336336c | Michael S. Tsirkin | if (offset >= iov[i].iov_len) {
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240 | d336336c | Michael S. Tsirkin | offset -= iov[i].iov_len; |
241 | d336336c | Michael S. Tsirkin | continue;
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242 | d336336c | Michael S. Tsirkin | } |
243 | d336336c | Michael S. Tsirkin | len = MIN(bytes, iov[i].iov_len - offset); |
244 | d336336c | Michael S. Tsirkin | |
245 | d336336c | Michael S. Tsirkin | dst_iov[j].iov_base = iov[i].iov_base + offset; |
246 | d336336c | Michael S. Tsirkin | dst_iov[j].iov_len = len; |
247 | d336336c | Michael S. Tsirkin | j++; |
248 | d336336c | Michael S. Tsirkin | bytes -= len; |
249 | d336336c | Michael S. Tsirkin | offset = 0;
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250 | d336336c | Michael S. Tsirkin | } |
251 | d336336c | Michael S. Tsirkin | assert(offset == 0);
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252 | d336336c | Michael S. Tsirkin | return j;
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253 | d336336c | Michael S. Tsirkin | } |
254 | f563a5d7 | Paolo Bonzini | |
255 | 0191253c | Paolo Bonzini | /* io vectors */
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256 | 0191253c | Paolo Bonzini | |
257 | 0191253c | Paolo Bonzini | void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint) |
258 | 0191253c | Paolo Bonzini | { |
259 | 0191253c | Paolo Bonzini | qiov->iov = g_malloc(alloc_hint * sizeof(struct iovec)); |
260 | 0191253c | Paolo Bonzini | qiov->niov = 0;
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261 | 0191253c | Paolo Bonzini | qiov->nalloc = alloc_hint; |
262 | 0191253c | Paolo Bonzini | qiov->size = 0;
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263 | 0191253c | Paolo Bonzini | } |
264 | 0191253c | Paolo Bonzini | |
265 | 0191253c | Paolo Bonzini | void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov) |
266 | 0191253c | Paolo Bonzini | { |
267 | 0191253c | Paolo Bonzini | int i;
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268 | 0191253c | Paolo Bonzini | |
269 | 0191253c | Paolo Bonzini | qiov->iov = iov; |
270 | 0191253c | Paolo Bonzini | qiov->niov = niov; |
271 | 0191253c | Paolo Bonzini | qiov->nalloc = -1;
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272 | 0191253c | Paolo Bonzini | qiov->size = 0;
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273 | 0191253c | Paolo Bonzini | for (i = 0; i < niov; i++) |
274 | 0191253c | Paolo Bonzini | qiov->size += iov[i].iov_len; |
275 | 0191253c | Paolo Bonzini | } |
276 | 0191253c | Paolo Bonzini | |
277 | 0191253c | Paolo Bonzini | void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len) |
278 | 0191253c | Paolo Bonzini | { |
279 | 0191253c | Paolo Bonzini | assert(qiov->nalloc != -1);
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280 | 0191253c | Paolo Bonzini | |
281 | 0191253c | Paolo Bonzini | if (qiov->niov == qiov->nalloc) {
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282 | 0191253c | Paolo Bonzini | qiov->nalloc = 2 * qiov->nalloc + 1; |
283 | 0191253c | Paolo Bonzini | qiov->iov = g_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec)); |
284 | 0191253c | Paolo Bonzini | } |
285 | 0191253c | Paolo Bonzini | qiov->iov[qiov->niov].iov_base = base; |
286 | 0191253c | Paolo Bonzini | qiov->iov[qiov->niov].iov_len = len; |
287 | 0191253c | Paolo Bonzini | qiov->size += len; |
288 | 0191253c | Paolo Bonzini | ++qiov->niov; |
289 | 0191253c | Paolo Bonzini | } |
290 | 0191253c | Paolo Bonzini | |
291 | 0191253c | Paolo Bonzini | /*
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292 | 0191253c | Paolo Bonzini | * Concatenates (partial) iovecs from src to the end of dst.
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293 | 0191253c | Paolo Bonzini | * It starts copying after skipping `soffset' bytes at the
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294 | 0191253c | Paolo Bonzini | * beginning of src and adds individual vectors from src to
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295 | 0191253c | Paolo Bonzini | * dst copies up to `sbytes' bytes total, or up to the end
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296 | 0191253c | Paolo Bonzini | * of src if it comes first. This way, it is okay to specify
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297 | 0191253c | Paolo Bonzini | * very large value for `sbytes' to indicate "up to the end
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298 | 0191253c | Paolo Bonzini | * of src".
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299 | 0191253c | Paolo Bonzini | * Only vector pointers are processed, not the actual data buffers.
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300 | 0191253c | Paolo Bonzini | */
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301 | 0191253c | Paolo Bonzini | void qemu_iovec_concat(QEMUIOVector *dst,
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302 | 0191253c | Paolo Bonzini | QEMUIOVector *src, size_t soffset, size_t sbytes) |
303 | 0191253c | Paolo Bonzini | { |
304 | 0191253c | Paolo Bonzini | int i;
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305 | 0191253c | Paolo Bonzini | size_t done; |
306 | 0191253c | Paolo Bonzini | struct iovec *siov = src->iov;
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307 | 0191253c | Paolo Bonzini | assert(dst->nalloc != -1);
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308 | 0191253c | Paolo Bonzini | assert(src->size >= soffset); |
309 | 0191253c | Paolo Bonzini | for (i = 0, done = 0; done < sbytes && i < src->niov; i++) { |
310 | 0191253c | Paolo Bonzini | if (soffset < siov[i].iov_len) {
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311 | 0191253c | Paolo Bonzini | size_t len = MIN(siov[i].iov_len - soffset, sbytes - done); |
312 | 0191253c | Paolo Bonzini | qemu_iovec_add(dst, siov[i].iov_base + soffset, len); |
313 | 0191253c | Paolo Bonzini | done += len; |
314 | 0191253c | Paolo Bonzini | soffset = 0;
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315 | 0191253c | Paolo Bonzini | } else {
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316 | 0191253c | Paolo Bonzini | soffset -= siov[i].iov_len; |
317 | 0191253c | Paolo Bonzini | } |
318 | 0191253c | Paolo Bonzini | } |
319 | 0191253c | Paolo Bonzini | /* return done; */
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320 | 0191253c | Paolo Bonzini | } |
321 | 0191253c | Paolo Bonzini | |
322 | 0191253c | Paolo Bonzini | void qemu_iovec_destroy(QEMUIOVector *qiov)
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323 | 0191253c | Paolo Bonzini | { |
324 | 0191253c | Paolo Bonzini | assert(qiov->nalloc != -1);
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325 | 0191253c | Paolo Bonzini | |
326 | 0191253c | Paolo Bonzini | qemu_iovec_reset(qiov); |
327 | 0191253c | Paolo Bonzini | g_free(qiov->iov); |
328 | 0191253c | Paolo Bonzini | qiov->nalloc = 0;
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329 | 0191253c | Paolo Bonzini | qiov->iov = NULL;
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330 | 0191253c | Paolo Bonzini | } |
331 | 0191253c | Paolo Bonzini | |
332 | 0191253c | Paolo Bonzini | void qemu_iovec_reset(QEMUIOVector *qiov)
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333 | 0191253c | Paolo Bonzini | { |
334 | 0191253c | Paolo Bonzini | assert(qiov->nalloc != -1);
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335 | 0191253c | Paolo Bonzini | |
336 | 0191253c | Paolo Bonzini | qiov->niov = 0;
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337 | 0191253c | Paolo Bonzini | qiov->size = 0;
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338 | 0191253c | Paolo Bonzini | } |
339 | 0191253c | Paolo Bonzini | |
340 | 0191253c | Paolo Bonzini | size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset, |
341 | 0191253c | Paolo Bonzini | void *buf, size_t bytes)
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342 | 0191253c | Paolo Bonzini | { |
343 | 0191253c | Paolo Bonzini | return iov_to_buf(qiov->iov, qiov->niov, offset, buf, bytes);
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344 | 0191253c | Paolo Bonzini | } |
345 | 0191253c | Paolo Bonzini | |
346 | 0191253c | Paolo Bonzini | size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset, |
347 | 0191253c | Paolo Bonzini | const void *buf, size_t bytes) |
348 | 0191253c | Paolo Bonzini | { |
349 | 0191253c | Paolo Bonzini | return iov_from_buf(qiov->iov, qiov->niov, offset, buf, bytes);
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350 | 0191253c | Paolo Bonzini | } |
351 | 0191253c | Paolo Bonzini | |
352 | 0191253c | Paolo Bonzini | size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset, |
353 | 0191253c | Paolo Bonzini | int fillc, size_t bytes)
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354 | 0191253c | Paolo Bonzini | { |
355 | 0191253c | Paolo Bonzini | return iov_memset(qiov->iov, qiov->niov, offset, fillc, bytes);
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356 | 0191253c | Paolo Bonzini | } |