Mercurial > cpython-lru_cache-weakref

annotate Objects/stringlib/transmogrify.h @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents b36cb4602e21
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* NOTE: this API is -ONLY- for use with single byte character strings. */
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2 /* Do not use it with Unicode. */
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3
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4 /* the more complicated methods. parts of these should be pulled out into the
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5 shared code in bytes_methods.c to cut down on duplicate code bloat. */
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6
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7 PyDoc_STRVAR(expandtabs__doc__,
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8 "B.expandtabs([tabsize]) -> copy of B\n\
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9 \n\
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10 Return a copy of B where all tab characters are expanded using spaces.\n\
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11 If tabsize is not given, a tab size of 8 characters is assumed.");
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12
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13 static PyObject*
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14 stringlib_expandtabs(PyObject *self, PyObject *args)
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15 {
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16 const char *e, *p;
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17 char *q;
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18 size_t i, j;
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19 PyObject *u;
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20 int tabsize = 8;
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21
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22 if (!PyArg_ParseTuple(args, "|i:expandtabs", &tabsize))
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23 return NULL;
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24
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25 /* First pass: determine size of output string */
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26 i = j = 0;
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27 e = STRINGLIB_STR(self) + STRINGLIB_LEN(self);
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28 for (p = STRINGLIB_STR(self); p < e; p++)
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29 if (*p == '\t') {
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30 if (tabsize > 0) {
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31 j += tabsize - (j % tabsize);
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32 if (j > PY_SSIZE_T_MAX) {
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33 PyErr_SetString(PyExc_OverflowError,
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34 "result is too long");
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35 return NULL;
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36 }
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37 }
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38 }
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39 else {
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40 j++;
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41 if (*p == '\n' || *p == '\r') {
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42 i += j;
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43 j = 0;
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44 if (i > PY_SSIZE_T_MAX) {
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45 PyErr_SetString(PyExc_OverflowError,
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46 "result is too long");
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47 return NULL;
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48 }
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49 }
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50 }
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51
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52 if ((i + j) > PY_SSIZE_T_MAX) {
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53 PyErr_SetString(PyExc_OverflowError, "result is too long");
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54 return NULL;
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55 }
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56
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57 /* Second pass: create output string and fill it */
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58 u = STRINGLIB_NEW(NULL, i + j);
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59 if (!u)
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60 return NULL;
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61
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62 j = 0;
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63 q = STRINGLIB_STR(u);
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64
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65 for (p = STRINGLIB_STR(self); p < e; p++)
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66 if (*p == '\t') {
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67 if (tabsize > 0) {
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68 i = tabsize - (j % tabsize);
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69 j += i;
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70 while (i--)
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71 *q++ = ' ';
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72 }
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73 }
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74 else {
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75 j++;
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76 *q++ = *p;
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77 if (*p == '\n' || *p == '\r')
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78 j = 0;
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79 }
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80
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81 return u;
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82 }
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83
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84 Py_LOCAL_INLINE(PyObject *)
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85 pad(PyObject *self, Py_ssize_t left, Py_ssize_t right, char fill)
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86 {
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87 PyObject *u;
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88
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89 if (left < 0)
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90 left = 0;
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91 if (right < 0)
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92 right = 0;
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93
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94 if (left == 0 && right == 0 && STRINGLIB_CHECK_EXACT(self)) {
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95 #if STRINGLIB_MUTABLE
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96 /* We're defined as returning a copy; If the object is mutable
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97 * that means we must make an identical copy. */
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98 return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
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99 #else
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100 Py_INCREF(self);
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101 return (PyObject *)self;
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102 #endif /* STRINGLIB_MUTABLE */
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103 }
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104
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105 u = STRINGLIB_NEW(NULL,
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106 left + STRINGLIB_LEN(self) + right);
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107 if (u) {
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108 if (left)
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109 memset(STRINGLIB_STR(u), fill, left);
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110 Py_MEMCPY(STRINGLIB_STR(u) + left,
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111 STRINGLIB_STR(self),
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112 STRINGLIB_LEN(self));
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113 if (right)
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114 memset(STRINGLIB_STR(u) + left + STRINGLIB_LEN(self),
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115 fill, right);
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116 }
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117
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118 return u;
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119 }
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120
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121 PyDoc_STRVAR(ljust__doc__,
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122 "B.ljust(width[, fillchar]) -> copy of B\n"
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123 "\n"
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124 "Return B left justified in a string of length width. Padding is\n"
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125 "done using the specified fill character (default is a space).");
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126
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127 static PyObject *
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128 stringlib_ljust(PyObject *self, PyObject *args)
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129 {
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130 Py_ssize_t width;
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131 char fillchar = ' ';
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132
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133 if (!PyArg_ParseTuple(args, "n|c:ljust", &width, &fillchar))
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134 return NULL;
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135
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136 if (STRINGLIB_LEN(self) >= width && STRINGLIB_CHECK_EXACT(self)) {
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137 #if STRINGLIB_MUTABLE
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138 /* We're defined as returning a copy; If the object is mutable
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139 * that means we must make an identical copy. */
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140 return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
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141 #else
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142 Py_INCREF(self);
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143 return (PyObject*) self;
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144 #endif
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145 }
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146
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147 return pad(self, 0, width - STRINGLIB_LEN(self), fillchar);
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148 }
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149
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150
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151 PyDoc_STRVAR(rjust__doc__,
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152 "B.rjust(width[, fillchar]) -> copy of B\n"
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153 "\n"
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154 "Return B right justified in a string of length width. Padding is\n"
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155 "done using the specified fill character (default is a space)");
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156
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157 static PyObject *
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158 stringlib_rjust(PyObject *self, PyObject *args)
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159 {
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160 Py_ssize_t width;
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161 char fillchar = ' ';
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162
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163 if (!PyArg_ParseTuple(args, "n|c:rjust", &width, &fillchar))
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164 return NULL;
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165
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166 if (STRINGLIB_LEN(self) >= width && STRINGLIB_CHECK_EXACT(self)) {
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167 #if STRINGLIB_MUTABLE
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168 /* We're defined as returning a copy; If the object is mutable
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169 * that means we must make an identical copy. */
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170 return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
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171 #else
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172 Py_INCREF(self);
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173 return (PyObject*) self;
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174 #endif
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175 }
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176
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177 return pad(self, width - STRINGLIB_LEN(self), 0, fillchar);
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178 }
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179
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180
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181 PyDoc_STRVAR(center__doc__,
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182 "B.center(width[, fillchar]) -> copy of B\n"
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183 "\n"
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184 "Return B centered in a string of length width. Padding is\n"
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185 "done using the specified fill character (default is a space).");
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186
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187 static PyObject *
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188 stringlib_center(PyObject *self, PyObject *args)
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189 {
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190 Py_ssize_t marg, left;
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191 Py_ssize_t width;
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192 char fillchar = ' ';
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193
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194 if (!PyArg_ParseTuple(args, "n|c:center", &width, &fillchar))
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195 return NULL;
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196
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197 if (STRINGLIB_LEN(self) >= width && STRINGLIB_CHECK_EXACT(self)) {
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198 #if STRINGLIB_MUTABLE
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199 /* We're defined as returning a copy; If the object is mutable
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200 * that means we must make an identical copy. */
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201 return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
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202 #else
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203 Py_INCREF(self);
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204 return (PyObject*) self;
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205 #endif
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206 }
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207
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208 marg = width - STRINGLIB_LEN(self);
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209 left = marg / 2 + (marg & width & 1);
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210
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211 return pad(self, left, marg - left, fillchar);
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212 }
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213
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214 PyDoc_STRVAR(zfill__doc__,
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215 "B.zfill(width) -> copy of B\n"
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216 "\n"
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217 "Pad a numeric string B with zeros on the left, to fill a field\n"
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218 "of the specified width. B is never truncated.");
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219
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220 static PyObject *
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221 stringlib_zfill(PyObject *self, PyObject *args)
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222 {
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223 Py_ssize_t fill;
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224 PyObject *s;
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225 char *p;
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226 Py_ssize_t width;
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227
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228 if (!PyArg_ParseTuple(args, "n:zfill", &width))
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229 return NULL;
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230
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231 if (STRINGLIB_LEN(self) >= width) {
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232 if (STRINGLIB_CHECK_EXACT(self)) {
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233 #if STRINGLIB_MUTABLE
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234 /* We're defined as returning a copy; If the object is mutable
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235 * that means we must make an identical copy. */
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236 return STRINGLIB_NEW(STRINGLIB_STR(self), STRINGLIB_LEN(self));
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237 #else
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238 Py_INCREF(self);
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239 return (PyObject*) self;
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240 #endif
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241 }
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242 else
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243 return STRINGLIB_NEW(
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244 STRINGLIB_STR(self),
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245 STRINGLIB_LEN(self)
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246 );
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247 }
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248
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249 fill = width - STRINGLIB_LEN(self);
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250
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251 s = pad(self, fill, 0, '0');
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252
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253 if (s == NULL)
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254 return NULL;
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255
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256 p = STRINGLIB_STR(s);
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257 if (p[fill] == '+' || p[fill] == '-') {
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258 /* move sign to beginning of string */
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259 p[0] = p[fill];
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260 p[fill] = '0';
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261 }
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262
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263 return (PyObject*) s;
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264 }