Mercurial > hg
annotate mercurial/bdiff_module.c @ 29799:45fa8de47a0f
py3: provide (del|get|has|set)attr wrappers that accepts bytes
These functions will be imported automagically by our code transformer.
getattr() and setattr() are widely used in our code. We wouldn't probably
want to rewrite every single call of getattr/setattr. delattr() and hasattr()
aren't that important, but they are functions of the same kind.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 14 Aug 2016 12:51:21 +0900 |
parents | 9631ff5ebbeb |
children | 15635d8b17e0 |
rev | line source |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
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4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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5 |
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6 This software may be used and distributed according to the terms of |
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7 the GNU General Public License, incorporated herein by reference. |
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8 |
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9 Based roughly on Python difflib |
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10 */ |
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11 |
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12 #define PY_SSIZE_T_CLEAN |
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13 #include <Python.h> |
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14 #include <stdlib.h> |
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15 #include <string.h> |
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16 #include <limits.h> |
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17 |
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18 #include "bdiff.h" |
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19 #include "bitmanipulation.h" |
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20 |
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21 |
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22 static PyObject *blocks(PyObject *self, PyObject *args) |
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23 { |
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24 PyObject *sa, *sb, *rl = NULL, *m; |
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25 struct bdiff_line *a, *b; |
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26 struct bdiff_hunk l, *h; |
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27 int an, bn, count, pos = 0; |
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28 |
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29 l.next = NULL; |
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30 |
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31 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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32 return NULL; |
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33 |
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34 an = bdiff_splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
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35 bn = bdiff_splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
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36 |
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37 if (!a || !b) |
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38 goto nomem; |
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39 |
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40 count = bdiff_diff(a, an, b, bn, &l); |
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41 if (count < 0) |
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42 goto nomem; |
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43 |
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44 rl = PyList_New(count); |
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45 if (!rl) |
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46 goto nomem; |
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47 |
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48 for (h = l.next; h; h = h->next) { |
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49 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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50 PyList_SetItem(rl, pos, m); |
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51 pos++; |
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52 } |
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53 |
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54 nomem: |
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55 free(a); |
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56 free(b); |
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57 bdiff_freehunks(l.next); |
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58 return rl ? rl : PyErr_NoMemory(); |
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59 } |
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60 |
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61 static PyObject *bdiff(PyObject *self, PyObject *args) |
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62 { |
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63 char *sa, *sb, *rb; |
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64 PyObject *result = NULL; |
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65 struct bdiff_line *al, *bl; |
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66 struct bdiff_hunk l, *h; |
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67 int an, bn, count; |
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68 Py_ssize_t len = 0, la, lb; |
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69 PyThreadState *_save; |
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70 |
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71 l.next = NULL; |
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72 |
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73 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb)) |
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74 return NULL; |
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75 |
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76 if (la > UINT_MAX || lb > UINT_MAX) { |
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77 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large"); |
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78 return NULL; |
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79 } |
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80 |
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81 _save = PyEval_SaveThread(); |
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82 an = bdiff_splitlines(sa, la, &al); |
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83 bn = bdiff_splitlines(sb, lb, &bl); |
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84 if (!al || !bl) |
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85 goto nomem; |
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86 |
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87 count = bdiff_diff(al, an, bl, bn, &l); |
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88 if (count < 0) |
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89 goto nomem; |
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90 |
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91 /* calculate length of output */ |
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92 la = lb = 0; |
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93 for (h = l.next; h; h = h->next) { |
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94 if (h->a1 != la || h->b1 != lb) |
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95 len += 12 + bl[h->b1].l - bl[lb].l; |
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96 la = h->a2; |
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97 lb = h->b2; |
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98 } |
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99 PyEval_RestoreThread(_save); |
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100 _save = NULL; |
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101 |
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102 result = PyBytes_FromStringAndSize(NULL, len); |
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103 |
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104 if (!result) |
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105 goto nomem; |
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106 |
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107 /* build binary patch */ |
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108 rb = PyBytes_AsString(result); |
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109 la = lb = 0; |
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110 |
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111 for (h = l.next; h; h = h->next) { |
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112 if (h->a1 != la || h->b1 != lb) { |
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113 len = bl[h->b1].l - bl[lb].l; |
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114 putbe32((uint32_t)(al[la].l - al->l), rb); |
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115 putbe32((uint32_t)(al[h->a1].l - al->l), rb + 4); |
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116 putbe32((uint32_t)len, rb + 8); |
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117 memcpy(rb + 12, bl[lb].l, len); |
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118 rb += 12 + len; |
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119 } |
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120 la = h->a2; |
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121 lb = h->b2; |
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122 } |
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123 |
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124 nomem: |
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125 if (_save) |
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126 PyEval_RestoreThread(_save); |
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127 free(al); |
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128 free(bl); |
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129 bdiff_freehunks(l.next); |
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130 return result ? result : PyErr_NoMemory(); |
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131 } |
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132 |
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133 /* |
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134 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise, |
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135 * reduce whitespace sequences to a single space and trim remaining whitespace |
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136 * from end of lines. |
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137 */ |
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138 static PyObject *fixws(PyObject *self, PyObject *args) |
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139 { |
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140 PyObject *s, *result = NULL; |
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141 char allws, c; |
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142 const char *r; |
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143 Py_ssize_t i, rlen, wlen = 0; |
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144 char *w; |
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145 |
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146 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws)) |
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147 return NULL; |
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148 r = PyBytes_AsString(s); |
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149 rlen = PyBytes_Size(s); |
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150 |
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151 w = (char *)malloc(rlen ? rlen : 1); |
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152 if (!w) |
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153 goto nomem; |
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154 |
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155 for (i = 0; i != rlen; i++) { |
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156 c = r[i]; |
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157 if (c == ' ' || c == '\t' || c == '\r') { |
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158 if (!allws && (wlen == 0 || w[wlen - 1] != ' ')) |
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159 w[wlen++] = ' '; |
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160 } else if (c == '\n' && !allws |
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161 && wlen > 0 && w[wlen - 1] == ' ') { |
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162 w[wlen - 1] = '\n'; |
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163 } else { |
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164 w[wlen++] = c; |
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165 } |
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166 } |
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167 |
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168 result = PyBytes_FromStringAndSize(w, wlen); |
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169 |
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170 nomem: |
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171 free(w); |
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172 return result ? result : PyErr_NoMemory(); |
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173 } |
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174 |
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175 |
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176 static char mdiff_doc[] = "Efficient binary diff."; |
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177 |
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178 static PyMethodDef methods[] = { |
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179 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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180 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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181 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"}, |
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182 {NULL, NULL} |
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183 }; |
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184 |
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185 #ifdef IS_PY3K |
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186 static struct PyModuleDef bdiff_module = { |
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187 PyModuleDef_HEAD_INIT, |
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188 "bdiff", |
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189 mdiff_doc, |
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190 -1, |
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191 methods |
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192 }; |
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193 |
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194 PyMODINIT_FUNC PyInit_bdiff(void) |
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195 { |
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196 return PyModule_Create(&bdiff_module); |
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197 } |
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198 #else |
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199 PyMODINIT_FUNC initbdiff(void) |
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200 { |
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201 Py_InitModule3("bdiff", methods, mdiff_doc); |
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202 } |
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203 #endif |