Mercurial > cpython-lru_cache-weakref

annotate Modules/_bisectmodule.c @ 39496:352ffe77b71d legacy-trunk

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Patch #1535500: fix segfault in BZ2File.writelines and make sure it raises the correct exceptions.
author Georg Brandl <georg@python.org>
date Mon, 14 Aug 2006 21:42:55 +0000
parents 0bebeb393045
children 8e7383cbe56e f324631462a2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Bisection algorithms. Drop in replacement for bisect.py
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2
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3 Converted to C by Dmitry Vasiliev (dima at hlabs.spb.ru).
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4 */
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5
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6 #include "Python.h"
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7
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8 static int
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9 internal_bisect_right(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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10 {
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11 PyObject *litem;
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12 Py_ssize_t mid, res;
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13
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14 if (hi == -1) {
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15 hi = PySequence_Size(list);
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16 if (hi < 0)
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17 return -1;
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18 }
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19 while (lo < hi) {
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20 mid = (lo + hi) / 2;
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21 litem = PySequence_GetItem(list, mid);
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22 if (litem == NULL)
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23 return -1;
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24 res = PyObject_RichCompareBool(item, litem, Py_LT);
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25 Py_DECREF(litem);
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26 if (res < 0)
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27 return -1;
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28 if (res)
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29 hi = mid;
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30 else
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31 lo = mid + 1;
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32 }
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33 return lo;
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34 }
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35
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36 static PyObject *
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37 bisect_right(PyObject *self, PyObject *args, PyObject *kw)
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38 {
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39 PyObject *list, *item;
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40 int lo = 0;
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41 int hi = -1;
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42 int index;
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43 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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44
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45 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|ii:bisect_right",
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46 keywords, &list, &item, &lo, &hi))
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47 return NULL;
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48 index = internal_bisect_right(list, item, lo, hi);
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49 if (index < 0)
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50 return NULL;
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51 return PyInt_FromLong(index);
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52 }
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53
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54 PyDoc_STRVAR(bisect_right_doc,
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55 "bisect_right(a, x[, lo[, hi]]) -> index\n\
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56 \n\
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57 Return the index where to insert item x in list a, assuming a is sorted.\n\
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58 \n\
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59 The return value i is such that all e in a[:i] have e <= x, and all e in\n\
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60 a[i:] have e > x. So if x already appears in the list, i points just\n\
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61 beyond the rightmost x already there\n\
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62 \n\
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63 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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64 slice of a to be searched.\n");
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65
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66 static PyObject *
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67 insort_right(PyObject *self, PyObject *args, PyObject *kw)
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68 {
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69 PyObject *list, *item, *result;
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70 int lo = 0;
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71 int hi = -1;
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72 int index;
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73 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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74
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75 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|ii:insort_right",
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76 keywords, &list, &item, &lo, &hi))
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77 return NULL;
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78 index = internal_bisect_right(list, item, lo, hi);
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79 if (index < 0)
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80 return NULL;
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81 if (PyList_Check(list)) {
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82 if (PyList_Insert(list, index, item) < 0)
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83 return NULL;
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84 } else {
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85 result = PyObject_CallMethod(list, "insert", "iO",
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86 index, item);
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87 if (result == NULL)
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88 return NULL;
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89 Py_DECREF(result);
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90 }
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91
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92 Py_RETURN_NONE;
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93 }
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94
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95 PyDoc_STRVAR(insort_right_doc,
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96 "insort_right(a, x[, lo[, hi]])\n\
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97 \n\
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98 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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99 \n\
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100 If x is already in a, insert it to the right of the rightmost x.\n\
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101 \n\
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102 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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103 slice of a to be searched.\n");
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104
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105 static int
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106 internal_bisect_left(PyObject *list, PyObject *item, int lo, int hi)
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107 {
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108 PyObject *litem;
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109 int mid, res;
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110
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111 if (hi == -1) {
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112 hi = PySequence_Size(list);
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113 if (hi < 0)
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114 return -1;
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115 }
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116 while (lo < hi) {
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117 mid = (lo + hi) / 2;
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118 litem = PySequence_GetItem(list, mid);
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119 if (litem == NULL)
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120 return -1;
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121 res = PyObject_RichCompareBool(litem, item, Py_LT);
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122 Py_DECREF(litem);
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123 if (res < 0)
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124 return -1;
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125 if (res)
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126 lo = mid + 1;
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127 else
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128 hi = mid;
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129 }
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130 return lo;
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131 }
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132
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133 static PyObject *
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134 bisect_left(PyObject *self, PyObject *args, PyObject *kw)
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135 {
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136 PyObject *list, *item;
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137 int lo = 0;
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138 int hi = -1;
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139 int index;
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140 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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141
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142 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|ii:bisect_left",
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143 keywords, &list, &item, &lo, &hi))
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144 return NULL;
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145 index = internal_bisect_left(list, item, lo, hi);
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146 if (index < 0)
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147 return NULL;
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148 return PyInt_FromLong(index);
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149 }
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150
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151 PyDoc_STRVAR(bisect_left_doc,
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152 "bisect_left(a, x[, lo[, hi]]) -> index\n\
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153 \n\
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154 Return the index where to insert item x in list a, assuming a is sorted.\n\
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155 \n\
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156 The return value i is such that all e in a[:i] have e < x, and all e in\n\
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157 a[i:] have e >= x. So if x already appears in the list, i points just\n\
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158 before the leftmost x already there.\n\
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159 \n\
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160 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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161 slice of a to be searched.\n");
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162
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163 static PyObject *
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164 insort_left(PyObject *self, PyObject *args, PyObject *kw)
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165 {
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166 PyObject *list, *item, *result;
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167 int lo = 0;
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168 int hi = -1;
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169 int index;
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170 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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171
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172 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|ii:insort_left",
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173 keywords, &list, &item, &lo, &hi))
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174 return NULL;
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175 index = internal_bisect_left(list, item, lo, hi);
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176 if (index < 0)
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177 return NULL;
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178 if (PyList_Check(list)) {
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179 if (PyList_Insert(list, index, item) < 0)
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180 return NULL;
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181 } else {
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182 result = PyObject_CallMethod(list, "insert", "iO",
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183 index, item);
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184 if (result == NULL)
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185 return NULL;
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186 Py_DECREF(result);
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187 }
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188
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189 Py_RETURN_NONE;
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190 }
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191
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192 PyDoc_STRVAR(insort_left_doc,
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193 "insort_left(a, x[, lo[, hi]])\n\
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194 \n\
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195 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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196 \n\
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197 If x is already in a, insert it to the left of the leftmost x.\n\
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198 \n\
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199 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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200 slice of a to be searched.\n");
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201
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202 PyDoc_STRVAR(bisect_doc, "Alias for bisect_right().\n");
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203 PyDoc_STRVAR(insort_doc, "Alias for insort_right().\n");
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204
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205 static PyMethodDef bisect_methods[] = {
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206 {"bisect_right", (PyCFunction)bisect_right,
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207 METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
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208 {"bisect", (PyCFunction)bisect_right,
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209 METH_VARARGS|METH_KEYWORDS, bisect_doc},
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210 {"insort_right", (PyCFunction)insort_right,
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211 METH_VARARGS|METH_KEYWORDS, insort_right_doc},
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212 {"insort", (PyCFunction)insort_right,
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213 METH_VARARGS|METH_KEYWORDS, insort_doc},
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214 {"bisect_left", (PyCFunction)bisect_left,
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215 METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
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216 {"insort_left", (PyCFunction)insort_left,
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217 METH_VARARGS|METH_KEYWORDS, insort_left_doc},
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218 {NULL, NULL} /* sentinel */
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219 };
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220
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221 PyDoc_STRVAR(module_doc,
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222 "Bisection algorithms.\n\
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223 \n\
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224 This module provides support for maintaining a list in sorted order without\n\
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225 having to sort the list after each insertion. For long lists of items with\n\
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226 expensive comparison operations, this can be an improvement over the more\n\
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227 common approach.\n");
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228
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229 PyMODINIT_FUNC
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230 init_bisect(void)
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231 {
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232 PyObject *m;
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233
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234 m = Py_InitModule3("_bisect", bisect_methods, module_doc);
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235 }