Mercurial > cpython-lru_cache-weakref

annotate Python/import.c @ 716:4d64abbdf70a legacy-trunk

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author Guido van Rossum <guido@python.org>
date Tue, 24 Mar 1992 13:46:39 +0000
parents 5aff9f8fd299
children 9a754486ef0b
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1 /***********************************************************
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2 Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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3 Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Module definition and import implementation */
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26
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27 #include "allobjects.h"
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28
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29 #include "node.h"
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30 #include "token.h"
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31 #include "graminit.h"
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32 #include "import.h"
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33 #include "errcode.h"
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34 #include "sysmodule.h"
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35 #include "pythonrun.h"
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36 #include "marshal.h"
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37 #include "compile.h"
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38 #include "ceval.h"
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39 #include "osdefs.h"
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40
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41 #ifdef DEBUG
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42 #define D(x) x
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43 #else
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44 #define D(x)
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45 #endif
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46
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47 #ifdef USE_DL
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48 #include "dl.h"
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49
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50 extern char *argv0;
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51 #endif
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52
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53 /* Magic word to reject pre-0.9.4 .pyc files */
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54
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55 #define MAGIC 0x949494L
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56
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57 static object *modules;
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58
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59 /* Forward */
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60 static int init_builtin PROTO((char *));
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61
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62 /* Initialization */
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63
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64 void
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65 initimport()
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66 {
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67 if ((modules = newdictobject()) == NULL)
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68 fatal("no mem for dictionary of modules");
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69 }
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70
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71 object *
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72 get_modules()
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73 {
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74 return modules;
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75 }
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76
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77 object *
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78 add_module(name)
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79 char *name;
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80 {
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81 object *m;
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82 if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))
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83 return m;
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84 m = newmoduleobject(name);
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85 if (m == NULL)
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86 return NULL;
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87 if (dictinsert(modules, name, m) != 0) {
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88 DECREF(m);
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89 return NULL;
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90 }
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91 DECREF(m); /* Yes, it still exists, in modules! */
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92 return m;
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93 }
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94
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95 /* Suffixes used by open_module: */
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96
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97 #define PY_SUFFIX ".py"
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98 #ifdef USE_DL
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99 #define O_SUFFIX "module.o"
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100 #endif
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101
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102 /* Find and open a module file, using sys.path.
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103 Return a NULL pointer if no module file is found.
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104 When dynamic loading is enabled, the contents of namebuf
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105 is important when NULL is returned: if namebuf[0] != '\0'
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106 a dl-able object file was found and namebuf is its pathname. */
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107
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108 static FILE *
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109 open_module(name, namebuf)
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110 char *name;
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111 char *namebuf; /* XXX No buffer overflow checks! */
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112 {
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113 object *path;
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114 FILE *fp;
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115
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116 path = sysget("path");
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117 if (path == NULL || !is_listobject(path)) {
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118 /* No path -- at least try current directory */
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119 #ifdef USE_DL
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120 strcpy(namebuf, name);
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121 strcat(namebuf, O_SUFFIX);
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122 if (getmtime(namebuf) > 0)
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123 return NULL;
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124 #endif
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125 strcpy(namebuf, name);
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126 strcat(namebuf, PY_SUFFIX);
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127 fp = fopen(namebuf, "r");
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128 }
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129 else {
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130 int npath = getlistsize(path);
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131 int i;
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132 fp = NULL;
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133 for (i = 0; i < npath; i++) {
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134 object *v = getlistitem(path, i);
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135 int len;
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136 if (!is_stringobject(v))
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137 continue;
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138 strcpy(namebuf, getstringvalue(v));
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139 len = getstringsize(v);
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140 if (len > 0 && namebuf[len-1] != SEP)
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141 namebuf[len++] = SEP;
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142 #ifdef USE_DL
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143 strcpy(namebuf+len, name);
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144 strcat(namebuf, O_SUFFIX);
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145 if (getmtime(namebuf) > 0)
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146 return NULL;
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147 #endif
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148 strcpy(namebuf+len, name);
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149 strcat(namebuf, PY_SUFFIX);
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150 fp = fopen(namebuf, "r");
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151 if (fp != NULL)
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152 break;
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153 }
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154 }
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155 if (fp == NULL)
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156 namebuf[0] = '\0';
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157 return fp;
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158 }
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159
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160 static object *
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161 get_module(m, name, m_ret)
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162 /*module*/object *m;
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163 char *name;
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164 object **m_ret;
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165 {
263
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166 codeobject *co = NULL;
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167 object *v, *d;
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168 FILE *fp, *fpc;
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169 node *n;
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170 int err;
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171 char namebuf[MAXPATHLEN+1];
263
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172 int namelen;
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173 long mtime;
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174 extern long getmtime();
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175
609
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176 fp = open_module(name, namebuf);
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177 if (fp == NULL) {
609
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178 #ifdef USE_DL
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179 if (namebuf[0] != '\0') {
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180 char funcname[258];
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181 dl_funcptr p;
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182 D(fprintf(stderr, "Found %s\n", namebuf));
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183 sprintf(funcname, "init%s", name);
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184 p = dl_loadmod(argv0, namebuf, funcname);
609
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185 if (p == NULL) {
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186 D(fprintf(stderr, "dl_loadmod failed\n"));
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187 }
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188 else {
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189 (*p)();
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190 *m_ret = m = dictlookup(modules, name);
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191 if (m == NULL) {
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192 err_setstr(SystemError,
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193 "dynamic module missing");
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194 return NULL;
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195 }
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196 else {
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197 D(fprintf(stderr,
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198 "module %s loaded!\n", name));
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199 INCREF(None);
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200 return None;
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201 }
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202 }
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203 }
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204 #endif
510
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205 if (m == NULL) {
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206 sprintf(namebuf, "no module named %.200s", name);
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207 err_setstr(ImportError, namebuf);
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208 }
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209 else {
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210 sprintf(namebuf, "no source for module %.200s", name);
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211 err_setstr(ImportError, namebuf);
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212 }
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213 return NULL;
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214 }
263
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215 /* Get mtime -- always useful */
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216 mtime = getmtime(namebuf);
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217 /* Check ".pyc" file first */
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218 namelen = strlen(namebuf);
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219 namebuf[namelen] = 'c';
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220 namebuf[namelen+1] = '\0';
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221 fpc = fopen(namebuf, "rb");
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222 if (fpc != NULL) {
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223 long pyc_mtime;
487
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224 long magic;
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225 magic = rd_long(fpc);
263
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226 pyc_mtime = rd_long(fpc);
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227 if (magic == MAGIC && pyc_mtime == mtime && mtime != 0 && mtime != -1) {
263
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228 v = rd_object(fpc);
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229 if (v == NULL || err_occurred() || !is_codeobject(v)) {
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230 err_clear();
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231 XDECREF(v);
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232 }
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233 else
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234 co = (codeobject *)v;
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235 }
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236 fclose(fpc);
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237 }
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238 namebuf[namelen] = '\0';
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239 if (co == NULL)
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240 err = parse_file(fp, namebuf, file_input, &n);
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241 else
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242 err = E_DONE;
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243 fclose(fp);
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244 if (err != E_DONE) {
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245 err_input(err);
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246 return NULL;
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247 }
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248 if (m == NULL) {
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249 m = add_module(name);
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250 if (m == NULL) {
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251 freetree(n);
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252 return NULL;
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253 }
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254 *m_ret = m;
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255 }
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256 d = getmoduledict(m);
263
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257 if (co == NULL) {
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258 co = compile(n, namebuf);
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259 freetree(n);
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260 if (co == NULL)
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261 return NULL;
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262 /* Now write the code object to the ".pyc" file */
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263 namebuf[namelen] = 'c';
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264 namebuf[namelen+1] = '\0';
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265 fpc = fopen(namebuf, "wb");
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266 if (fpc != NULL) {
487
77b80a91d357 New magic word; and check it.
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267 wr_long(MAGIC, fpc);
263
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268 /* First write a 0 for mtime */
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269 wr_long(0L, fpc);
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270 wr_object((object *)co, fpc);
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271 if (ferror(fpc)) {
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272 /* Don't keep partial file */
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273 fclose(fpc);
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274 (void) unlink(namebuf);
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275 }
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276 else {
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277 /* Now write the true mtime */
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278 fseek(fpc, 4L, 0);
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diff changeset
279 wr_long(mtime, fpc);
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280 fflush(fpc);
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281 fclose(fpc);
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diff changeset
282 }
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283 }
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284 }
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285 v = eval_code(co, d, d, (object *)NULL);
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286 DECREF(co);
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287 return v;
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diff changeset
288 }
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289
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290 static object *
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diff changeset
291 load_module(name)
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diff changeset
292 char *name;
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diff changeset
293 {
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diff changeset
294 object *m, *v;
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295 v = get_module((object *)NULL, name, &m);
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diff changeset
296 if (v == NULL)
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297 return NULL;
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diff changeset
298 DECREF(v);
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299 return m;
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300 }
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301
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302 object *
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diff changeset
303 import_module(name)
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304 char *name;
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305 {
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306 object *m;
141
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diff changeset
307 if ((m = dictlookup(modules, name)) == NULL) {
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diff changeset
308 if (init_builtin(name)) {
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diff changeset
309 if ((m = dictlookup(modules, name)) == NULL)
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diff changeset
310 err_setstr(SystemError, "builtin module missing");
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diff changeset
311 }
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diff changeset
312 else {
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313 m = load_module(name);
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314 }
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315 }
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316 return m;
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317 }
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318
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319 object *
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320 reload_module(m)
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321 object *m;
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322 {
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323 if (m == NULL || !is_moduleobject(m)) {
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324 err_setstr(TypeError, "reload() argument must be module");
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325 return NULL;
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326 }
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327 /* XXX Ought to check for builtin modules -- can't reload these... */
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328 return get_module(m, getmodulename(m), (object **)NULL);
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329 }
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330
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331 static void
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332 cleardict(d)
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333 object *d;
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334 {
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335 int i;
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336 for (i = getdictsize(d); --i >= 0; ) {
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337 char *k;
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338 k = getdictkey(d, i);
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339 if (k != NULL)
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340 (void) dictremove(d, k);
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341 }
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342 }
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343
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344 void
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345 doneimport()
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346 {
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347 if (modules != NULL) {
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348 int i;
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349 /* Explicitly erase all modules; this is the safest way
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350 to get rid of at least *some* circular dependencies */
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351 for (i = getdictsize(modules); --i >= 0; ) {
340
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352 object *k;
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353 k = getdict2key(modules, i);
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354 if (k != NULL) {
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355 object *m;
340
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356 m = dict2lookup(modules, k);
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357 if (m == NULL)
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358 err_clear();
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359 else if (is_moduleobject(m)) {
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360 object *d;
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361 d = getmoduledict(m);
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362 if (d != NULL && is_dictobject(d)) {
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363 cleardict(d);
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364 }
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365 }
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366 }
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367 }
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368 cleardict(modules);
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369 }
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370 DECREF(modules);
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371 }
141
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372
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373
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374 /* Initialize built-in modules when first imported */
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375
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376 extern struct {
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377 char *name;
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378 void (*initfunc)();
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379 } inittab[];
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380
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381 static int
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382 init_builtin(name)
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383 char *name;
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384 {
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385 int i;
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386 for (i = 0; inittab[i].name != NULL; i++) {
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387 if (strcmp(name, inittab[i].name) == 0) {
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388 (*inittab[i].initfunc)();
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389 return 1;
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390 }
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391 }
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392 return 0;
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393 }