Mercurial > cpython-lru_cache-weakref

annotate Python/pystrtod.c @ 45403:0ea236a71d77 legacy-trunk

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Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
author Eric Smith <eric@trueblade.com>
date Wed, 20 Feb 2008 23:34:22 +0000
parents 3fcaf6cc306d
children 4d29127f3fa0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 const char *digits_pos = NULL;
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52 int negate = 0;
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53
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54 assert(nptr != NULL);
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55
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56 fail_pos = NULL;
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57
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58 locale_data = localeconv();
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59 decimal_point = locale_data->decimal_point;
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60 decimal_point_len = strlen(decimal_point);
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61
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62 assert(decimal_point_len != 0);
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63
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64 decimal_point_pos = NULL;
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65
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66 /* We process any leading whitespace and the optional sign manually,
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67 then pass the remainder to the system strtod. This ensures that
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68 the result of an underflow has the correct sign. (bug #1725) */
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69
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70 p = nptr;
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71 /* Skip leading space */
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72 while (ISSPACE(*p))
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73 p++;
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74
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75 /* Process leading sign, if present */
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76 if (*p == '-') {
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77 negate = 1;
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78 p++;
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79 } else if (*p == '+') {
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80 p++;
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81 }
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82
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83 /* What's left should begin with a digit, a decimal point, or one of
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84 the letters i, I, n, N. It should not begin with 0x or 0X */
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85 if ((!ISDIGIT(*p) &&
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86 *p != '.' && *p != 'i' && *p != 'I' && *p != 'n' && *p != 'N')
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87 ||
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88 (*p == '0' && (p[1] == 'x' || p[1] == 'X')))
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89 {
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90 if (endptr)
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91 *endptr = (char*)nptr;
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92 errno = EINVAL;
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93 return val;
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94 }
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95 digits_pos = p;
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96
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97 if (decimal_point[0] != '.' ||
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98 decimal_point[1] != 0)
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99 {
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100 while (ISDIGIT(*p))
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101 p++;
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102
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103 if (*p == '.')
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104 {
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105 decimal_point_pos = p++;
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106
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107 while (ISDIGIT(*p))
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108 p++;
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109
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110 if (*p == 'e' || *p == 'E')
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111 p++;
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112 if (*p == '+' || *p == '-')
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113 p++;
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114 while (ISDIGIT(*p))
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115 p++;
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116 end = p;
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117 }
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118 else if (strncmp(p, decimal_point, decimal_point_len) == 0)
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119 {
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120 /* Python bug #1417699 */
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121 if (endptr)
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122 *endptr = (char*)nptr;
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123 errno = EINVAL;
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124 return val;
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125 }
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126 /* For the other cases, we need not convert the decimal point */
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127 }
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128
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129 /* Set errno to zero, so that we can distinguish zero results
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130 and underflows */
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131 errno = 0;
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132
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133 if (decimal_point_pos)
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134 {
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135 char *copy, *c;
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136
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137 /* We need to convert the '.' to the locale specific decimal point */
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138 copy = (char *)PyMem_MALLOC(end - digits_pos +
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139 1 + decimal_point_len);
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140 if (copy == NULL) {
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141 if (endptr)
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142 *endptr = (char *)nptr;
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143 errno = ENOMEM;
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144 return val;
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145 }
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146
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147 c = copy;
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148 memcpy(c, digits_pos, decimal_point_pos - digits_pos);
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149 c += decimal_point_pos - digits_pos;
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150 memcpy(c, decimal_point, decimal_point_len);
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151 c += decimal_point_len;
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152 memcpy(c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
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153 c += end - (decimal_point_pos + 1);
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154 *c = 0;
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155
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156 val = strtod(copy, &fail_pos);
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157
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158 if (fail_pos)
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159 {
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160 if (fail_pos > decimal_point_pos)
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161 fail_pos = (char *)digits_pos +
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162 (fail_pos - copy) -
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163 (decimal_point_len - 1);
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164 else
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165 fail_pos = (char *)digits_pos +
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166 (fail_pos - copy);
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167 }
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168
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3d477d158401 Swap out bare malloc()/free() use for PyMem_MALLOC()/PyMem_FREE() .
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169 PyMem_FREE(copy);
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170
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171 }
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172 else {
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173 val = strtod(digits_pos, &fail_pos);
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174 }
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175
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176 if (fail_pos == digits_pos)
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177 fail_pos = (char *)nptr;
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178
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179 if (negate && fail_pos != nptr)
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180 val = -val;
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181
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182 if (endptr)
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183 *endptr = fail_pos;
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184
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185 return val;
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186 }
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187
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188
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189 /* From the C99 standard, section 7.19.6:
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190 The exponent always contains at least two digits, and only as many more digits
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191 as necessary to represent the exponent.
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192 */
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193 #define MIN_EXPONENT_DIGITS 2
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194
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195 /* see FORMATBUFLEN in unicodeobject.c */
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196 #define FLOAT_FORMATBUFLEN 120
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197
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198 /**
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199 * PyOS_ascii_formatd:
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200 * @buffer: A buffer to place the resulting string in
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201 * @buf_len: The length of the buffer.
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202 * @format: The printf()-style format to use for the
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203 * code to use for converting.
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204 * @d: The #gdouble to convert
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205 *
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206 * Converts a #gdouble to a string, using the '.' as
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207 * decimal point. To format the number you pass in
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208 * a printf()-style format string. Allowed conversion
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209 * specifiers are 'e', 'E', 'f', 'F', 'g', 'G', and 'n'.
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210 *
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211 * 'n' is the same as 'g', except it uses the current locale.
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parents: 44482
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212 *
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213 * Return value: The pointer to the buffer with the converted string.
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214 **/
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215 char *
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216 PyOS_ascii_formatd(char *buffer,
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217 size_t buf_len,
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218 const char *format,
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219 double d)
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220 {
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221 char *p;
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222 char format_char;
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223 size_t format_len = strlen(format);
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224
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225 /* For type 'n', we need to make a copy of the format string, because
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226 we're going to modify 'n' -> 'g', and format is const char*, so we
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227 can't modify it directly. FLOAT_FORMATBUFLEN should be longer than
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228 we ever need this to be. There's an upcoming check to ensure it's
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229 big enough. */
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230 char tmp_format[FLOAT_FORMATBUFLEN];
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231
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232 /* g_return_val_if_fail (buffer != NULL, NULL); */
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233 /* g_return_val_if_fail (format[0] == '%', NULL); */
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234 /* g_return_val_if_fail (strpbrk (format + 1, "'l%") == NULL, NULL); */
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235
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236 /* The last character in the format string must be the format char */
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237 format_char = format[format_len - 1];
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238
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239 /* g_return_val_if_fail (format_char == 'e' || format_char == 'E' || */
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240 /* format_char == 'f' || format_char == 'F' || */
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241 /* format_char == 'g' || format_char == 'G', */
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242 /* NULL); */
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243
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244 if (format[0] != '%')
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245 return NULL;
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246
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247 /* I'm not sure why this test is here. It's ensuring that the format
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248 string after the first character doesn't have a single quote, a
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249 lowercase l, or a percent. This is the reverse of the commented-out
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250 test about 10 lines ago. */
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251 if (strpbrk(format + 1, "'l%"))
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252 return NULL;
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253
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254 if (!(format_char == 'e' || format_char == 'E' ||
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255 format_char == 'f' || format_char == 'F' ||
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256 format_char == 'g' || format_char == 'G' ||
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257 format_char == 'n'))
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258 return NULL;
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259
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260 /* Map 'n' format_char to 'g', by copying the format string and
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261 replacing the final 'n' with a 'g' */
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262 if (format_char == 'n') {
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263 if (format_len + 1 >= sizeof(tmp_format)) {
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264 /* The format won't fit in our copy. Error out. In
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265 practice, this will never happen and will be detected
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266 by returning NULL */
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267 return NULL;
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268 }
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269 strcpy(tmp_format, format);
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270 tmp_format[format_len - 1] = 'g';
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271 format = tmp_format;
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272 }
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273
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274 /* Have PyOS_snprintf do the hard work */
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275 PyOS_snprintf(buffer, buf_len, format, d);
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276
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277 /* Get the current local, and find the decimal point character (or
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278 string?). Convert that string back to a dot. Do not do this if
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279 using the 'n' (number) format code. */
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280 if (format_char != 'n') {
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281 struct lconv *locale_data = localeconv();
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282 const char *decimal_point = locale_data->decimal_point;
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283 size_t decimal_point_len = strlen(decimal_point);
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284 size_t rest_len;
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285
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286 assert(decimal_point_len != 0);
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287
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288 if (decimal_point[0] != '.' || decimal_point[1] != 0) {
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289 p = buffer;
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290
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291 if (*p == '+' || *p == '-')
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292 p++;
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293
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294 while (isdigit(Py_CHARMASK(*p)))
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295 p++;
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296
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297 if (strncmp(p, decimal_point, decimal_point_len) == 0) {
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298 *p = '.';
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299 p++;
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300 if (decimal_point_len > 1) {
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301 rest_len = strlen(p +
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302 (decimal_point_len - 1));
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303 memmove(p, p + (decimal_point_len - 1),
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304 rest_len);
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305 p[rest_len] = 0;
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306 }
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307 }
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308 }
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309 }
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310
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311 /* If an exponent exists, ensure that the exponent is at least
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312 MIN_EXPONENT_DIGITS digits, providing the buffer is large enough
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313 for the extra zeros. Also, if there are more than
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314 MIN_EXPONENT_DIGITS, remove as many zeros as possible until we get
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315 back to MIN_EXPONENT_DIGITS */
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316 p = strpbrk(buffer, "eE");
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317 if (p && (*(p + 1) == '-' || *(p + 1) == '+')) {
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318 char *start = p + 2;
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319 int exponent_digit_cnt = 0;
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320 int leading_zero_cnt = 0;
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321 int in_leading_zeros = 1;
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322 int significant_digit_cnt;
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323
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diff changeset
324 p += 2;
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325 while (*p && isdigit(Py_CHARMASK(*p))) {
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326 if (in_leading_zeros && *p == '0')
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327 ++leading_zero_cnt;
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328 if (*p != '0')
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329 in_leading_zeros = 0;
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330 ++p;
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331 ++exponent_digit_cnt;
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parents: 44482
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332 }
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parents:
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333
45403
0ea236a71d77 Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
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parents: 44482
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334 significant_digit_cnt = exponent_digit_cnt - leading_zero_cnt;
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335 if (exponent_digit_cnt == MIN_EXPONENT_DIGITS) {
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parents: 44482
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336 /* If there are 2 exactly digits, we're done,
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parents: 44482
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337 regardless of what they contain */
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parents: 44482
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338 }
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parents: 44482
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339 else if (exponent_digit_cnt > MIN_EXPONENT_DIGITS) {
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parents: 44482
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340 int extra_zeros_cnt;
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parents: 44482
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341
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parents: 44482
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342 /* There are more than 2 digits in the exponent. See
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parents: 44482
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343 if we can delete some of the leading zeros */
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parents: 44482
diff changeset
344 if (significant_digit_cnt < MIN_EXPONENT_DIGITS)
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parents: 44482
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345 significant_digit_cnt = MIN_EXPONENT_DIGITS;
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346 extra_zeros_cnt = exponent_digit_cnt - significant_digit_cnt;
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parents: 44482
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347
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parents: 44482
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348 /* Delete extra_zeros_cnt worth of characters from the
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parents: 44482
diff changeset
349 front of the exponent */
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parents: 44482
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350 assert(extra_zeros_cnt >= 0);
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parents: 44482
diff changeset
351
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parents: 44482
diff changeset
352 /* Add one to significant_digit_cnt to copy the
0ea236a71d77 Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
353 trailing 0 byte, thus setting the length */
0ea236a71d77 Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
354 memmove(start,
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Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
355 start + extra_zeros_cnt,
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Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
356 significant_digit_cnt + 1);
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Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
357 }
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parents: 44482
diff changeset
358 else {
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parents: 44482
diff changeset
359 /* If there are fewer than 2 digits, add zeros
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parents: 44482
diff changeset
360 until there are 2, if there's enough room */
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parents: 44482
diff changeset
361 int zeros = MIN_EXPONENT_DIGITS - exponent_digit_cnt;
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Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
362 if (start + zeros + exponent_digit_cnt + 1
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Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
363 < buffer + buf_len) {
0ea236a71d77 Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
364 memmove(start + zeros, start,
0ea236a71d77 Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
365 exponent_digit_cnt + 1);
0ea236a71d77 Trim leading zeros from a floating point exponent, per C99. See issue 1600. As far as I know, this only affects Windows. Add float type 'n' to PyOS_ascii_formatd (see PEP 3101 for 'n' description).
Eric Smith <eric@trueblade.com>
parents: 44482
diff changeset
366 memset(start, '0', zeros);
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parents:
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367 }
13656d58d450 Patch #774665: Make Python LC_NUMERIC agnostic.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
368 }
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Martin v. Löwis <martin@v.loewis.de>
parents:
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369 }
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diff changeset
370
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parents:
diff changeset
371 return buffer;
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parents:
diff changeset
372 }
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Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
373
13656d58d450 Patch #774665: Make Python LC_NUMERIC agnostic.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
374 double
13656d58d450 Patch #774665: Make Python LC_NUMERIC agnostic.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
375 PyOS_ascii_atof(const char *nptr)
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
376 {
13656d58d450 Patch #774665: Make Python LC_NUMERIC agnostic.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
377 return PyOS_ascii_strtod(nptr, NULL);
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diff changeset
378 }