Mercurial > cpython-lru_cache-weakref

annotate Python/import.c @ 662:aaff650d7e13 legacy-trunk

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Get rid of comment about open().
author Guido van Rossum <guido@python.org>
date Wed, 05 Feb 1992 11:17:52 +0000
parents 04ed4765b17c
children 5aff9f8fd299
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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40 #ifdef DEBUG
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41 #define D(x) x
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42 #else
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43 #define D(x)
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44 #endif
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45
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46 #ifdef USE_DL
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47 #include "dl.h"
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48
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49 extern char *argv0;
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50 #endif
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51
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52 /* Magic word to reject pre-0.9.4 .pyc files */
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53
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54 #define MAGIC 0x949494L
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55
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56 /* Define pathname separator used in file names */
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57
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58 #ifdef macintosh
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59 #define SEP ':'
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60 #endif
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61
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62 #ifdef MSDOS
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63 #define SEP '\\'
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64 #endif
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65
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66 #ifndef SEP
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67 #define SEP '/'
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68 #endif
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69
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70 static object *modules;
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71
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72 /* Forward */
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73 static int init_builtin PROTO((char *));
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74
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75 /* Initialization */
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76
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77 void
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78 initimport()
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79 {
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80 if ((modules = newdictobject()) == NULL)
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81 fatal("no mem for dictionary of modules");
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82 }
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83
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84 object *
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85 get_modules()
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86 {
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87 return modules;
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88 }
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89
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90 object *
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91 add_module(name)
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92 char *name;
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93 {
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94 object *m;
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95 if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))
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96 return m;
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97 m = newmoduleobject(name);
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98 if (m == NULL)
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99 return NULL;
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100 if (dictinsert(modules, name, m) != 0) {
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101 DECREF(m);
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102 return NULL;
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103 }
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104 DECREF(m); /* Yes, it still exists, in modules! */
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105 return m;
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106 }
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107
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108 /* Suffixes used by open_module: */
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109
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110 #define PY_SUFFIX ".py"
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111 #ifdef USE_DL
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112 #define O_SUFFIX "module.o"
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113 #endif
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114
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115 /* Find and open a module file, using sys.path.
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116 Return a NULL pointer if no module file is found.
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117 When dynamic loading is enabled, the contents of namebuf
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118 is important when NULL is returned: if namebuf[0] != '\0'
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119 a dl-able object file was found and namebuf is its pathname. */
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120
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121 static FILE *
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122 open_module(name, namebuf)
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123 char *name;
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124 char *namebuf; /* XXX No buffer overflow checks! */
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125 {
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126 object *path;
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127 FILE *fp;
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128
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129 path = sysget("path");
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130 if (path == NULL || !is_listobject(path)) {
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131 /* No path -- at least try current directory */
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132 #ifdef USE_DL
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133 strcpy(namebuf, name);
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134 strcat(namebuf, O_SUFFIX);
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135 if (getmtime(namebuf) > 0)
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136 return NULL;
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137 #endif
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138 strcpy(namebuf, name);
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139 strcat(namebuf, PY_SUFFIX);
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140 fp = fopen(namebuf, "r");
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141 }
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142 else {
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143 int npath = getlistsize(path);
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144 int i;
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145 fp = NULL;
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146 for (i = 0; i < npath; i++) {
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147 object *v = getlistitem(path, i);
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148 int len;
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149 if (!is_stringobject(v))
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150 continue;
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151 strcpy(namebuf, getstringvalue(v));
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152 len = getstringsize(v);
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153 if (len > 0 && namebuf[len-1] != SEP)
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154 namebuf[len++] = SEP;
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155 #ifdef USE_DL
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156 strcpy(namebuf+len, name);
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157 strcat(namebuf, O_SUFFIX);
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158 if (getmtime(namebuf) > 0)
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159 return NULL;
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160 #endif
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161 strcpy(namebuf+len, name);
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162 strcat(namebuf, PY_SUFFIX);
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163 fp = fopen(namebuf, "r");
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164 if (fp != NULL)
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165 break;
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166 }
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167 }
609
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168 if (fp == NULL)
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169 namebuf[0] = '\0';
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170 return fp;
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171 }
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172
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173 static object *
86
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174 get_module(m, name, m_ret)
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175 /*module*/object *m;
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176 char *name;
86
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177 object **m_ret;
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178 {
263
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179 codeobject *co = NULL;
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180 object *v, *d;
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181 FILE *fp, *fpc;
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182 node *n;
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183 int err;
263
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184 char namebuf[258];
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185 int namelen;
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186 long mtime;
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187 extern long getmtime();
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188
609
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189 fp = open_module(name, namebuf);
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190 if (fp == NULL) {
609
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191 #ifdef USE_DL
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192 if (namebuf[0] != '\0') {
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193 char funcname[258];
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194 dl_funcptr p;
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195 D(fprintf(stderr, "Found %s\n", namebuf));
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196 sprintf(funcname, "init%s", name);
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04ed4765b17c getbinaryname is now part of dl_loadmod.
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197 p = dl_loadmod(argv0, namebuf, funcname);
609
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198 if (p == NULL) {
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199 D(fprintf(stderr, "dl_loadmod failed\n"));
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200 }
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201 else {
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202 (*p)();
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203 *m_ret = m = dictlookup(modules, name);
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204 if (m == NULL) {
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205 err_setstr(SystemError,
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206 "dynamic module missing");
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207 return NULL;
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208 }
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209 else {
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210 D(fprintf(stderr,
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211 "module %s loaded!\n", name));
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212 INCREF(None);
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213 return None;
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parents: 510
diff changeset
214 }
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215 }
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parents: 510
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216 }
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diff changeset
217 #endif
510
cbcdfda05bc4 Use IOError and ImportError when import fails.
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218 if (m == NULL) {
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219 sprintf(namebuf, "no module named %.200s", name);
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220 err_setstr(ImportError, namebuf);
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diff changeset
221 }
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222 else {
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223 sprintf(namebuf, "no source for module %.200s", name);
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224 err_setstr(ImportError, namebuf);
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diff changeset
225 }
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226 return NULL;
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227 }
263
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228 /* Get mtime -- always useful */
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229 mtime = getmtime(namebuf);
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230 /* Check ".pyc" file first */
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231 namelen = strlen(namebuf);
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232 namebuf[namelen] = 'c';
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233 namebuf[namelen+1] = '\0';
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234 fpc = fopen(namebuf, "rb");
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235 if (fpc != NULL) {
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diff changeset
236 long pyc_mtime;
487
77b80a91d357 New magic word; and check it.
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diff changeset
237 long magic;
77b80a91d357 New magic word; and check it.
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diff changeset
238 magic = rd_long(fpc);
263
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diff changeset
239 pyc_mtime = rd_long(fpc);
487
77b80a91d357 New magic word; and check it.
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diff changeset
240 if (magic == MAGIC && pyc_mtime == mtime && mtime != 0 && mtime != -1) {
263
28f0ffd9facf Support ".pyc" files: cached compilation results.
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diff changeset
241 v = rd_object(fpc);
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242 if (v == NULL || err_occurred() || !is_codeobject(v)) {
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diff changeset
243 err_clear();
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diff changeset
244 XDECREF(v);
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diff changeset
245 }
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246 else
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diff changeset
247 co = (codeobject *)v;
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248 }
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diff changeset
249 fclose(fpc);
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250 }
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251 namebuf[namelen] = '\0';
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252 if (co == NULL)
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253 err = parse_file(fp, namebuf, file_input, &n);
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diff changeset
254 else
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diff changeset
255 err = E_DONE;
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256 fclose(fp);
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257 if (err != E_DONE) {
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258 err_input(err);
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259 return NULL;
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260 }
86
a6934380c6e7 "Compiling" version
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diff changeset
261 if (m == NULL) {
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diff changeset
262 m = add_module(name);
a6934380c6e7 "Compiling" version
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263 if (m == NULL) {
a6934380c6e7 "Compiling" version
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diff changeset
264 freetree(n);
a6934380c6e7 "Compiling" version
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diff changeset
265 return NULL;
a6934380c6e7 "Compiling" version
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diff changeset
266 }
a6934380c6e7 "Compiling" version
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diff changeset
267 *m_ret = m;
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diff changeset
268 }
a6934380c6e7 "Compiling" version
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diff changeset
269 d = getmoduledict(m);
263
28f0ffd9facf Support ".pyc" files: cached compilation results.
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diff changeset
270 if (co == NULL) {
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diff changeset
271 co = compile(n, namebuf);
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272 freetree(n);
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diff changeset
273 if (co == NULL)
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274 return NULL;
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diff changeset
275 /* Now write the code object to the ".pyc" file */
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diff changeset
276 namebuf[namelen] = 'c';
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diff changeset
277 namebuf[namelen+1] = '\0';
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diff changeset
278 fpc = fopen(namebuf, "wb");
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diff changeset
279 if (fpc != NULL) {
487
77b80a91d357 New magic word; and check it.
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diff changeset
280 wr_long(MAGIC, fpc);
263
28f0ffd9facf Support ".pyc" files: cached compilation results.
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diff changeset
281 /* First write a 0 for mtime */
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diff changeset
282 wr_long(0L, fpc);
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diff changeset
283 wr_object((object *)co, fpc);
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diff changeset
284 if (ferror(fpc)) {
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diff changeset
285 /* Don't keep partial file */
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diff changeset
286 fclose(fpc);
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diff changeset
287 (void) unlink(namebuf);
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diff changeset
288 }
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diff changeset
289 else {
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diff changeset
290 /* Now write the true mtime */
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diff changeset
291 fseek(fpc, 4L, 0);
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diff changeset
292 wr_long(mtime, fpc);
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diff changeset
293 fflush(fpc);
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diff changeset
294 fclose(fpc);
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diff changeset
295 }
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parents: 228
diff changeset
296 }
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diff changeset
297 }
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diff changeset
298 v = eval_code(co, d, d, (object *)NULL);
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diff changeset
299 DECREF(co);
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diff changeset
300 return v;
86
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diff changeset
301 }
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diff changeset
302
a6934380c6e7 "Compiling" version
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diff changeset
303 static object *
a6934380c6e7 "Compiling" version
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diff changeset
304 load_module(name)
a6934380c6e7 "Compiling" version
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diff changeset
305 char *name;
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
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diff changeset
306 {
a6934380c6e7 "Compiling" version
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diff changeset
307 object *m, *v;
a6934380c6e7 "Compiling" version
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diff changeset
308 v = get_module((object *)NULL, name, &m);
a6934380c6e7 "Compiling" version
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diff changeset
309 if (v == NULL)
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fc6fcd7df4f7 Initial revision
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diff changeset
310 return NULL;
86
a6934380c6e7 "Compiling" version
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diff changeset
311 DECREF(v);
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diff changeset
312 return m;
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313 }
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diff changeset
314
fc6fcd7df4f7 Initial revision
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diff changeset
315 object *
86
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316 import_module(name)
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317 char *name;
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318 {
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319 object *m;
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320 if ((m = dictlookup(modules, name)) == NULL) {
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321 if (init_builtin(name)) {
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322 if ((m = dictlookup(modules, name)) == NULL)
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323 err_setstr(SystemError, "builtin module missing");
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324 }
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325 else {
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326 m = load_module(name);
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327 }
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328 }
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329 return m;
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330 }
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331
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332 object *
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333 reload_module(m)
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334 object *m;
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335 {
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336 if (m == NULL || !is_moduleobject(m)) {
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337 err_setstr(TypeError, "reload() argument must be module");
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338 return NULL;
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339 }
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340 /* XXX Ought to check for builtin modules -- can't reload these... */
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341 return get_module(m, getmodulename(m), (object **)NULL);
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342 }
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343
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344 static void
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345 cleardict(d)
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346 object *d;
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347 {
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348 int i;
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349 for (i = getdictsize(d); --i >= 0; ) {
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350 char *k;
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351 k = getdictkey(d, i);
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352 if (k != NULL)
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353 (void) dictremove(d, k);
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354 }
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355 }
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356
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357 void
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358 doneimport()
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359 {
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360 if (modules != NULL) {
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361 int i;
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362 /* Explicitly erase all modules; this is the safest way
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363 to get rid of at least *some* circular dependencies */
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364 for (i = getdictsize(modules); --i >= 0; ) {
340
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365 object *k;
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366 k = getdict2key(modules, i);
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367 if (k != NULL) {
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368 object *m;
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369 m = dict2lookup(modules, k);
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370 if (m == NULL)
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371 err_clear();
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372 else if (is_moduleobject(m)) {
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373 object *d;
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374 d = getmoduledict(m);
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375 if (d != NULL && is_dictobject(d)) {
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376 cleardict(d);
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377 }
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378 }
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379 }
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380 }
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381 cleardict(modules);
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382 }
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383 DECREF(modules);
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384 }
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385
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386
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387 /* Initialize built-in modules when first imported */
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388
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389 extern struct {
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390 char *name;
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391 void (*initfunc)();
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392 } inittab[];
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393
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394 static int
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395 init_builtin(name)
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396 char *name;
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397 {
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398 int i;
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399 for (i = 0; inittab[i].name != NULL; i++) {
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400 if (strcmp(name, inittab[i].name) == 0) {
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401 (*inittab[i].initfunc)();
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402 return 1;
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403 }
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404 }
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405 return 0;
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406 }