Mercurial > hg
annotate mercurial/bdiff_module.c @ 30500:fc0cfe6c87d7
py3: add os.getcwdb() to have bytes path
Following the behaviour of Python 3, os.getcwd() return unicodes. We need
bytes version as path variables are bytes in UNIX. Python 3 has os.getcwdb()
which returns current working directory in bytes.
Like rest of the things there in pycompat, like osname, ossep, we need to
rewrite every instance of os.getcwd to pycompat.getcwd to make them work
correctly on Python 3.
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Tue, 22 Nov 2016 18:46:50 +0530 |
parents | 15635d8b17e0 |
children | 7c0c722d568d |
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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 #include "util.h" |
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21 |
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22 |
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23 static PyObject *blocks(PyObject *self, PyObject *args) |
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24 { |
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25 PyObject *sa, *sb, *rl = NULL, *m; |
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26 struct bdiff_line *a, *b; |
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27 struct bdiff_hunk l, *h; |
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28 int an, bn, count, pos = 0; |
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29 |
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30 l.next = NULL; |
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31 |
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32 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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33 return NULL; |
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34 |
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35 an = bdiff_splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
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36 bn = bdiff_splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
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37 |
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38 if (!a || !b) |
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39 goto nomem; |
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40 |
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41 count = bdiff_diff(a, an, b, bn, &l); |
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42 if (count < 0) |
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43 goto nomem; |
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44 |
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45 rl = PyList_New(count); |
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46 if (!rl) |
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47 goto nomem; |
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48 |
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49 for (h = l.next; h; h = h->next) { |
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50 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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51 PyList_SetItem(rl, pos, m); |
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52 pos++; |
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53 } |
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54 |
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55 nomem: |
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56 free(a); |
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57 free(b); |
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58 bdiff_freehunks(l.next); |
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59 return rl ? rl : PyErr_NoMemory(); |
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60 } |
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61 |
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62 static PyObject *bdiff(PyObject *self, PyObject *args) |
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63 { |
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64 char *sa, *sb, *rb; |
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65 PyObject *result = NULL; |
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66 struct bdiff_line *al, *bl; |
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67 struct bdiff_hunk l, *h; |
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68 int an, bn, count; |
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69 Py_ssize_t len = 0, la, lb; |
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70 PyThreadState *_save; |
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71 |
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72 l.next = NULL; |
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73 |
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74 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb)) |
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75 return NULL; |
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76 |
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77 if (la > UINT_MAX || lb > UINT_MAX) { |
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78 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large"); |
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79 return NULL; |
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80 } |
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81 |
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82 _save = PyEval_SaveThread(); |
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83 an = bdiff_splitlines(sa, la, &al); |
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84 bn = bdiff_splitlines(sb, lb, &bl); |
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85 if (!al || !bl) |
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86 goto nomem; |
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87 |
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88 count = bdiff_diff(al, an, bl, bn, &l); |
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89 if (count < 0) |
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90 goto nomem; |
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91 |
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92 /* calculate length of output */ |
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93 la = lb = 0; |
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94 for (h = l.next; h; h = h->next) { |
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95 if (h->a1 != la || h->b1 != lb) |
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96 len += 12 + bl[h->b1].l - bl[lb].l; |
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97 la = h->a2; |
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98 lb = h->b2; |
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99 } |
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100 PyEval_RestoreThread(_save); |
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101 _save = NULL; |
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102 |
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103 result = PyBytes_FromStringAndSize(NULL, len); |
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104 |
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105 if (!result) |
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106 goto nomem; |
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107 |
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108 /* build binary patch */ |
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109 rb = PyBytes_AsString(result); |
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110 la = lb = 0; |
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111 |
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112 for (h = l.next; h; h = h->next) { |
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113 if (h->a1 != la || h->b1 != lb) { |
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114 len = bl[h->b1].l - bl[lb].l; |
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115 putbe32((uint32_t)(al[la].l - al->l), rb); |
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116 putbe32((uint32_t)(al[h->a1].l - al->l), rb + 4); |
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117 putbe32((uint32_t)len, rb + 8); |
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118 memcpy(rb + 12, bl[lb].l, len); |
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119 rb += 12 + len; |
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120 } |
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121 la = h->a2; |
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122 lb = h->b2; |
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123 } |
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124 |
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125 nomem: |
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126 if (_save) |
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127 PyEval_RestoreThread(_save); |
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128 free(al); |
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129 free(bl); |
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130 bdiff_freehunks(l.next); |
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131 return result ? result : PyErr_NoMemory(); |
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132 } |
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133 |
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134 /* |
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135 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise, |
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136 * reduce whitespace sequences to a single space and trim remaining whitespace |
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137 * from end of lines. |
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138 */ |
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139 static PyObject *fixws(PyObject *self, PyObject *args) |
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140 { |
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141 PyObject *s, *result = NULL; |
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142 char allws, c; |
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143 const char *r; |
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144 Py_ssize_t i, rlen, wlen = 0; |
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145 char *w; |
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146 |
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147 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws)) |
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148 return NULL; |
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149 r = PyBytes_AsString(s); |
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150 rlen = PyBytes_Size(s); |
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151 |
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152 w = (char *)malloc(rlen ? rlen : 1); |
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153 if (!w) |
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154 goto nomem; |
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155 |
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156 for (i = 0; i != rlen; i++) { |
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157 c = r[i]; |
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158 if (c == ' ' || c == '\t' || c == '\r') { |
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159 if (!allws && (wlen == 0 || w[wlen - 1] != ' ')) |
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160 w[wlen++] = ' '; |
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161 } else if (c == '\n' && !allws |
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162 && wlen > 0 && w[wlen - 1] == ' ') { |
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163 w[wlen - 1] = '\n'; |
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164 } else { |
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165 w[wlen++] = c; |
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166 } |
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167 } |
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168 |
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169 result = PyBytes_FromStringAndSize(w, wlen); |
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170 |
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171 nomem: |
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172 free(w); |
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173 return result ? result : PyErr_NoMemory(); |
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174 } |
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175 |
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176 |
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177 static char mdiff_doc[] = "Efficient binary diff."; |
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178 |
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179 static PyMethodDef methods[] = { |
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180 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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181 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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182 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"}, |
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183 {NULL, NULL} |
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184 }; |
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185 |
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186 #ifdef IS_PY3K |
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187 static struct PyModuleDef bdiff_module = { |
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188 PyModuleDef_HEAD_INIT, |
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189 "bdiff", |
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190 mdiff_doc, |
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191 -1, |
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192 methods |
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193 }; |
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194 |
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195 PyMODINIT_FUNC PyInit_bdiff(void) |
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196 { |
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197 return PyModule_Create(&bdiff_module); |
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198 } |
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199 #else |
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200 PyMODINIT_FUNC initbdiff(void) |
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201 { |
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202 Py_InitModule3("bdiff", methods, mdiff_doc); |
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203 } |
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204 #endif |