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annotate Objects/methodobject.c @ 2105:ea7b2bf0b521 legacy-trunk

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add restrictions in restricted mode
author Guido van Rossum <guido@python.org>
date Tue, 10 Jan 1995 10:39:49 +0000
parents f2d267edbfd6
children d091b246a3a7
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
145
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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 /* Method object 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 "token.h"
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30
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31 typedef struct {
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32 OB_HEAD
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33 struct methodlist *m_ml;
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34 object *m_self;
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35 } methodobject;
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36
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37 object *
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38 newmethodobject(ml, self)
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39 struct methodlist *ml;
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40 object *self;
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41 {
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42 methodobject *op = NEWOBJ(methodobject, &Methodtype);
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43 if (op != NULL) {
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44 op->m_ml = ml;
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45 XINCREF(self);
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46 op->m_self = self;
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47 }
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48 return (object *)op;
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49 }
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50
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51 method
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52 getmethod(op)
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53 object *op;
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54 {
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55 if (!is_methodobject(op)) {
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56 err_badcall();
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57 return NULL;
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58 }
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59 return ((methodobject *)op) -> m_ml -> ml_meth;
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60 }
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61
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62 object *
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63 getself(op)
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64 object *op;
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65 {
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66 if (!is_methodobject(op)) {
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67 err_badcall();
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68 return NULL;
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69 }
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70 return ((methodobject *)op) -> m_self;
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71 }
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72
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73 int
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74 getvarargs(op)
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75 object *op;
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76 {
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77 if (!is_methodobject(op)) {
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78 err_badcall();
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79 return -1;
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80 }
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81 return ((methodobject *)op) -> m_ml -> ml_flags & METH_VARARGS;
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82 }
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83
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84 /* Methods (the standard built-in methods, that is) */
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85
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86 static void
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87 meth_dealloc(m)
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88 methodobject *m;
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89 {
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90 XDECREF(m->m_self);
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91 free((char *)m);
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92 }
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93
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94 static object *
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95 meth_getattr(m, name)
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96 methodobject *m;
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97 char *name;
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98 {
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99 if (strcmp(name, "__name__") == 0) {
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100 return newstringobject(m->m_ml->ml_name);
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101 }
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102 if (strcmp(name, "__doc__") == 0) {
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103 char *doc = m->m_ml->ml_doc;
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104 if (doc != NULL)
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105 return newstringobject(doc);
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106 INCREF(None);
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107 return None;
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108 }
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109 if (strcmp(name, "__self__") == 0) {
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110 object *self;
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111 if (getrestricted()) {
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112 err_setstr(RuntimeError,
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113 "method.__self__ not accessible in restricted mode");
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114 return NULL;
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115 }
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116 self = m->m_self;
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117 if (self == NULL)
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118 self = None;
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119 INCREF(self);
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120 return self;
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121 }
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122 if (strcmp(name, "__members__") == 0) {
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123 return mkvalue("[sss]", "__doc__", "__name__", "__self__");
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124 }
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125 err_setstr(AttributeError, name);
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126 return NULL;
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127 }
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128
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129 static object *
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130 meth_repr(m)
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131 methodobject *m;
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132 {
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133 char buf[200];
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134 if (m->m_self == NULL)
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135 sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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136 else
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137 sprintf(buf,
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138 "<built-in method %.80s of %.80s object at %lx>",
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139 m->m_ml->ml_name, m->m_self->ob_type->tp_name,
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140 (long)m->m_self);
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141 return newstringobject(buf);
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142 }
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143
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144 static int
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145 meth_compare(a, b)
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146 methodobject *a, *b;
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147 {
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148 if (a->m_self != b->m_self)
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149 return cmpobject(a->m_self, b->m_self);
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150 if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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151 return 0;
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152 if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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153 return -1;
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154 else
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155 return 1;
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156 }
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157
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158 static long
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159 meth_hash(a)
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160 methodobject *a;
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161 {
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162 long x;
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163 if (a->m_self == NULL)
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164 x = 0;
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165 else {
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166 x = hashobject(a->m_self);
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167 if (x == -1)
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168 return -1;
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169 }
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170 return x ^ (long) a->m_ml->ml_meth;
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171 }
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172
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173 typeobject Methodtype = {
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174 OB_HEAD_INIT(&Typetype)
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175 0,
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176 "builtin_function_or_method",
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177 sizeof(methodobject),
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178 0,
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179 (destructor)meth_dealloc, /*tp_dealloc*/
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180 0, /*tp_print*/
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181 (getattrfunc)meth_getattr, /*tp_getattr*/
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182 0, /*tp_setattr*/
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183 (cmpfunc)meth_compare, /*tp_compare*/
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184 (reprfunc)meth_repr, /*tp_repr*/
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185 0, /*tp_as_number*/
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186 0, /*tp_as_sequence*/
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187 0, /*tp_as_mapping*/
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188 (hashfunc)meth_hash, /*tp_hash*/
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189 };
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190
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191 static object *listmethods PROTO((struct methodlist *)); /* Forward */
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192
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193 static object *
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194 listmethods(ml)
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195 struct methodlist *ml;
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196 {
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197 int i, n;
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198 object *v;
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199 for (n = 0; ml[n].ml_name != NULL; n++)
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200 ;
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201 v = newlistobject(n);
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202 if (v != NULL) {
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203 for (i = 0; i < n; i++)
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204 setlistitem(v, i, newstringobject(ml[i].ml_name));
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205 if (err_occurred()) {
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206 DECREF(v);
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207 v = NULL;
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208 }
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209 else {
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210 sortlist(v);
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211 }
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212 }
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213 return v;
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214 }
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215
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216 /* Find a method in a module's method table.
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217 Usually called from an object's getattr method. */
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218
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219 object *
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220 findmethod(ml, op, name)
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221 struct methodlist *ml;
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222 object *op;
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223 char *name;
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224 {
395
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225 if (strcmp(name, "__methods__") == 0)
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226 return listmethods(ml);
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227 for (; ml->ml_name != NULL; ml++) {
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228 if (strcmp(name, ml->ml_name) == 0)
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229 return newmethodobject(ml, op);
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230 }
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231 err_setstr(AttributeError, name);
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232 return NULL;
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233 }