Mercurial > cpython-lru_cache-weakref

annotate Python/pystrtod.c @ 38897:53b04c19fe41 legacy-trunk

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Link to LibRef module documentation
author Andrew M. Kuchling <amk@amk.ca>
date Wed, 21 Jun 2006 17:10:18 +0000
parents 3d1a99b39fca
children 0e8a94ba2106
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1 /* -*- Mode: C; c-file-style: "python" -*- */
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2
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3 #include <Python.h>
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4 #include <locale.h>
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5
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6 /* ascii character tests (as opposed to locale tests) */
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7 #define ISSPACE(c) ((c) == ' ' || (c) == '\f' || (c) == '\n' || \
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8 (c) == '\r' || (c) == '\t' || (c) == '\v')
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9 #define ISDIGIT(c) ((c) >= '0' && (c) <= '9')
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10 #define ISXDIGIT(c) (ISDIGIT(c) || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))
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11
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12
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13 /**
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14 * PyOS_ascii_strtod:
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15 * @nptr: the string to convert to a numeric value.
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16 * @endptr: if non-%NULL, it returns the character after
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17 * the last character used in the conversion.
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18 *
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19 * Converts a string to a #gdouble value.
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20 * This function behaves like the standard strtod() function
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21 * does in the C locale. It does this without actually
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22 * changing the current locale, since that would not be
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23 * thread-safe.
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24 *
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25 * This function is typically used when reading configuration
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26 * files or other non-user input that should be locale independent.
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27 * To handle input from the user you should normally use the
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28 * locale-sensitive system strtod() function.
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29 *
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30 * If the correct value would cause overflow, plus or minus %HUGE_VAL
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31 * is returned (according to the sign of the value), and %ERANGE is
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32 * stored in %errno. If the correct value would cause underflow,
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33 * zero is returned and %ERANGE is stored in %errno.
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34 * If memory allocation fails, %ENOMEM is stored in %errno.
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35 *
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36 * This function resets %errno before calling strtod() so that
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37 * you can reliably detect overflow and underflow.
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38 *
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39 * Return value: the #gdouble value.
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40 **/
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41 double
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42 PyOS_ascii_strtod(const char *nptr, char **endptr)
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43 {
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44 char *fail_pos;
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45 double val = -1.0;
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46 struct lconv *locale_data;
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47 const char *decimal_point;
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48 size_t decimal_point_len;
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49 const char *p, *decimal_point_pos;
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50 const char *end = NULL; /* Silence gcc */
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51
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52 assert(nptr != NULL);
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53
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54 fail_pos = NULL;
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55
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56 locale_data = localeconv();
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57 decimal_point = locale_data->decimal_point;
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58 decimal_point_len = strlen(decimal_point);
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59
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60 assert(decimal_point_len != 0);
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61
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62 decimal_point_pos = NULL;
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63 if (decimal_point[0] != '.' ||
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64 decimal_point[1] != 0)
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65 {
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66 p = nptr;
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67 /* Skip leading space */
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68 while (ISSPACE(*p))
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69 p++;
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70
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71 /* Skip leading optional sign */
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72 if (*p == '+' || *p == '-')
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73 p++;
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74
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75 while (ISDIGIT(*p))
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76 p++;
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77
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78 if (*p == '.')
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79 {
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80 decimal_point_pos = p++;
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81
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82 while (ISDIGIT(*p))
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83 p++;
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84
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85 if (*p == 'e' || *p == 'E')
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86 p++;
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87 if (*p == '+' || *p == '-')
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88 p++;
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89 while (ISDIGIT(*p))
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90 p++;
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91 end = p;
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92 }
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93 /* For the other cases, we need not convert the decimal point */
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94 }
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95
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96 /* Set errno to zero, so that we can distinguish zero results
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97 and underflows */
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98 errno = 0;
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99
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100 if (decimal_point_pos)
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101 {
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102 char *copy, *c;
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103
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104 /* We need to convert the '.' to the locale specific decimal point */
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105 copy = (char *)PyMem_MALLOC(end - nptr + 1 + decimal_point_len);
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106 if (copy == NULL) {
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107 if (endptr)
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108 *endptr = (char *)nptr;
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109 errno = ENOMEM;
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110 return val;
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111 }
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112
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113 c = copy;
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114 memcpy(c, nptr, decimal_point_pos - nptr);
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115 c += decimal_point_pos - nptr;
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116 memcpy(c, decimal_point, decimal_point_len);
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117 c += decimal_point_len;
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118 memcpy(c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
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119 c += end - (decimal_point_pos + 1);
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120 *c = 0;
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121
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122 val = strtod(copy, &fail_pos);
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123
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124 if (fail_pos)
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125 {
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126 if (fail_pos > decimal_point_pos)
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127 fail_pos = (char *)nptr + (fail_pos - copy) - (decimal_point_len - 1);
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128 else
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129 fail_pos = (char *)nptr + (fail_pos - copy);
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130 }
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131
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3d477d158401 Swap out bare malloc()/free() use for PyMem_MALLOC()/PyMem_FREE() .
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132 PyMem_FREE(copy);
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133
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134 }
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135 else {
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136 unsigned i = 0;
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137 if (nptr[i] == '-')
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138 i++;
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139 if (nptr[i] == '0' && (nptr[i+1] == 'x' || nptr[i+1] == 'X'))
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140 fail_pos = (char*)nptr;
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141 else
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142 val = strtod(nptr, &fail_pos);
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143 }
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144
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145 if (endptr)
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146 *endptr = fail_pos;
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147
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148 return val;
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149 }
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150
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151
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152 /**
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153 * PyOS_ascii_formatd:
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154 * @buffer: A buffer to place the resulting string in
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155 * @buf_len: The length of the buffer.
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156 * @format: The printf()-style format to use for the
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157 * code to use for converting.
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158 * @d: The #gdouble to convert
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159 *
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160 * Converts a #gdouble to a string, using the '.' as
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161 * decimal point. To format the number you pass in
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162 * a printf()-style format string. Allowed conversion
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163 * specifiers are 'e', 'E', 'f', 'F', 'g' and 'G'.
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164 *
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165 * Return value: The pointer to the buffer with the converted string.
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166 **/
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167 char *
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168 PyOS_ascii_formatd(char *buffer,
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7fdc639bc5b4 Merge ssize_t branch.
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169 size_t buf_len,
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170 const char *format,
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171 double d)
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172 {
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173 struct lconv *locale_data;
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174 const char *decimal_point;
36230
ded4a497eb76 Fix icc warnings: strlen() returns size_t
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175 size_t decimal_point_len, rest_len;
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176 char *p;
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177 char format_char;
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178
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179 /* g_return_val_if_fail (buffer != NULL, NULL); */
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180 /* g_return_val_if_fail (format[0] == '%', NULL); */
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181 /* g_return_val_if_fail (strpbrk (format + 1, "'l%") == NULL, NULL); */
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182
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183 format_char = format[strlen(format) - 1];
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184
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185 /* g_return_val_if_fail (format_char == 'e' || format_char == 'E' || */
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186 /* format_char == 'f' || format_char == 'F' || */
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187 /* format_char == 'g' || format_char == 'G', */
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188 /* NULL); */
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189
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190 if (format[0] != '%')
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191 return NULL;
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192
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193 if (strpbrk(format + 1, "'l%"))
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194 return NULL;
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195
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196 if (!(format_char == 'e' || format_char == 'E' ||
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197 format_char == 'f' || format_char == 'F' ||
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198 format_char == 'g' || format_char == 'G'))
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199 return NULL;
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200
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201
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202 PyOS_snprintf(buffer, buf_len, format, d);
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203
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204 locale_data = localeconv();
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205 decimal_point = locale_data->decimal_point;
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206 decimal_point_len = strlen(decimal_point);
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207
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208 assert(decimal_point_len != 0);
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209
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210 if (decimal_point[0] != '.' ||
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diff changeset
211 decimal_point[1] != 0)
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212 {
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213 p = buffer;
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214
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215 if (*p == '+' || *p == '-')
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216 p++;
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217
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diff changeset
218 while (isdigit((unsigned char)*p))
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219 p++;
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diff changeset
220
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221 if (strncmp(p, decimal_point, decimal_point_len) == 0)
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222 {
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223 *p = '.';
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224 p++;
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225 if (decimal_point_len > 1) {
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226 rest_len = strlen(p + (decimal_point_len - 1));
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227 memmove(p, p + (decimal_point_len - 1),
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228 rest_len);
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229 p[rest_len] = 0;
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230 }
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231 }
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232 }
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233
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234 return buffer;
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235 }
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236
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237 double
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238 PyOS_ascii_atof(const char *nptr)
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239 {
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240 return PyOS_ascii_strtod(nptr, NULL);
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241 }