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1 /* vi:set ts=8 sts=4 sw=4:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 * BeBox port Copyright 1997 by Olaf Seibert.
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5 *
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6 * Do ":help uganda" in Vim to read copying and usage conditions.
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7 * Do ":help credits" in Vim to see a list of people who contributed.
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8 * See README.txt for an overview of the Vim source code.
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9 */
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10 /*
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11 * os_beos.c Additional stuff for BeOS (rest is in os_unix.c)
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12 */
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13
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14 #include <float.h>
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15 #include <termios.h>
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16 #include <kernel/OS.h>
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17 #include "vim.h"
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18
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19 #if USE_THREAD_FOR_INPUT_WITH_TIMEOUT
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20
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21 #ifdef PROTO /* making prototypes on Unix */
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22 #define sem_id int
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23 #define thread_id int
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24 #endif
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25
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26 char_u charbuf;
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27 signed char charcount;
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28 sem_id character_present;
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29 sem_id character_wanted;
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30 thread_id read_thread_id;
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31
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32 #define TRY_ABORT 0 /* This code does not work so turn it off. */
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33
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34 #if TRY_ABORT
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35 static void
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36 mostly_ignore(int sig)
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37 {
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38 }
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39 #endif
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40
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41 static long
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42 read_thread(void *dummy)
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43 {
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44 signal(SIGINT, SIG_IGN);
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45 signal(SIGQUIT, SIG_IGN);
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46 #if TRY_ABORT
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47 signal(SIGUSR1, mostly_ignore);
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48 #endif
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49
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50 for (;;) {
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51 if (acquire_sem(character_wanted) != B_NO_ERROR)
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52 break;
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53 charcount = read(read_cmd_fd, &charbuf, 1);
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54 release_sem(character_present);
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55 }
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56
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57 return 0;
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58 }
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59
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60 void
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61 beos_cleanup_read_thread(void)
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62 {
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63 if (character_present > 0)
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64 delete_sem(character_present);
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65 character_present = 0;
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66 if (read_thread_id > 0)
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67 kill_thread(read_thread_id);
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68 read_thread_id = 0;
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69 }
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70
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71 #endif
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72
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73 /*
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74 * select() emulation. Hopefully, in DR9 there will be something
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75 * useful supplied by the system. ... Alas, not. Not in AAPR, nor
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76 * in PR or even PR2... R3 then maybe? I don't think so!
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77 */
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78
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79 int
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80 beos_select(int nbits,
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81 struct fd_set *rbits,
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82 struct fd_set *wbits,
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83 struct fd_set *ebits,
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84 struct timeval *timeout)
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85 {
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86 bigtime_t tmo;
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87
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88 if (nbits == 0) {
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89 /* select is purely being used for delay */
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90 snooze(timeout->tv_sec * 1e6 + timeout->tv_usec);
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91 return 0;
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92 }
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93 #if 0
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94 /*
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95 * This does not seem to work either. Reads here are not supposed to
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96 * block indefinitely, yet they do. This is most annoying.
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97 */
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98 if (FD_ISSET(0, rbits)) {
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99 char cbuf[1];
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100 int count;
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101 struct termios told;
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102 struct termios tnew;
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103 tcgetattr(0, &told);
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104 tnew = told;
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105 tnew.c_lflag &= ~ICANON;
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106 tnew.c_cc[VMIN] = 0;
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107 tnew.c_cc[VTIME] = timeout->tv_sec * 10 + timeout->tv_usec / 100000;
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108 tcsetattr(0, TCSANOW, &tnew);
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109
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110 count = read(0, &cbuf, sizeof(cbuf));
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111 tcsetattr(0, TCSANOW, &told);
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112 if (count > 0) {
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113 add_to_input_buf(&cbuf[0], count);
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114 return 1;
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115 }
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116 return 0;
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117 }
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118 #endif
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119 #if USE_THREAD_FOR_INPUT_WITH_TIMEOUT
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120 /*
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121 * Check if the operation is really on stdin...
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122 */
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123 if (FD_ISSET(read_cmd_fd, rbits))
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124 {
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125 int acquired;
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126
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127 /*
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128 * Is this the first time through?
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129 * Then start up the thread and initialise the semaphores.
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130 */
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131 if (character_present == 0) {
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132 character_present = create_sem(0, "vim character_present");
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133 character_wanted = create_sem(1, "vim character_wanted");
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134 read_thread_id = spawn_thread(read_thread, "vim async read",
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135 B_NORMAL_PRIORITY, NULL);
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136 atexit(beos_cleanup_read_thread);
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137 resume_thread(read_thread_id);
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138 }
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139
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140 /* timeout == NULL means "indefinitely" */
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141 if (timeout) {
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142 tmo = timeout->tv_sec * 1e6 + timeout->tv_usec;
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143 /* 0 means "don't wait, which is impossible to do exactly. */
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144 if (tmo == 0)
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145 tmo = 1.0;
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146 }
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147 #if TRY_ABORT
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148 release_sem(character_wanted);
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149 #endif
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150 if (timeout)
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151 acquired = acquire_sem_etc(character_present, 1, B_TIMEOUT, tmo);
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152 else
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153 acquired = acquire_sem(character_present);
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154 if (acquired == B_NO_ERROR) {
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155 if (charcount > 0) {
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156 add_to_input_buf(&charbuf, 1);
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157 #if !TRY_ABORT
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158 release_sem(character_wanted);
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159 #endif
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160
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161 return 1;
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162 } else {
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163 #if !TRY_ABORT
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164 release_sem(character_wanted);
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165 #endif
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166
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167 return 0;
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168 }
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169 }
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170 #if TRY_ABORT
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171 else {
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172 /*
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173 * Timeout occurred. Break the read() call by sending
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174 * a signal. Problem: it may be just read()ing it now.
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175 * Therefore we still have to finish the handshake with
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176 * the thread and maybe remember the character.
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177 */
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178 kill(read_thread_id, SIGUSR1);
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179 /*
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180 * If some other error occurred, don't hang now.
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181 * (We will most likely hang later anyway...)
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182 */
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183 if (acquired == B_TIMED_OUT)
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184 acquire_sem(character_present);
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185 if (charcount > 0) {
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186 add_to_input_buf(&charbuf, 1);
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187 return 1;
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188 }
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189 return 0;
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190 }
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191 #endif
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192 }
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193 #endif
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194
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195 return 0;
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196 }
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197
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