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150
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1 //===------------------------- string.cpp ---------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "string"
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10 #include "charconv"
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11 #include "cstdlib"
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12 #include "cwchar"
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13 #include "cerrno"
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14 #include "limits"
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15 #include "stdexcept"
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16 #include <stdio.h>
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17 #include "__debug"
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18
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19 _LIBCPP_BEGIN_NAMESPACE_STD
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20
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21 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __basic_string_common<true>;
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22
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23 _LIBCPP_STRING_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
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24 _LIBCPP_STRING_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
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25
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26 template
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27 string
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28 operator+<char, char_traits<char>, allocator<char> >(char const*, string const&);
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29
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30 namespace
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31 {
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32
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33 template<typename T>
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34 inline
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35 void throw_helper( const string& msg )
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36 {
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37 #ifndef _LIBCPP_NO_EXCEPTIONS
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38 throw T( msg );
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39 #else
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40 fprintf(stderr, "%s\n", msg.c_str());
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41 _VSTD::abort();
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42 #endif
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43 }
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44
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45 inline
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46 void throw_from_string_out_of_range( const string& func )
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47 {
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48 throw_helper<out_of_range>(func + ": out of range");
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49 }
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50
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51 inline
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52 void throw_from_string_invalid_arg( const string& func )
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53 {
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54 throw_helper<invalid_argument>(func + ": no conversion");
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55 }
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56
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57 // as_integer
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58
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59 template<typename V, typename S, typename F>
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60 inline
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61 V
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62 as_integer_helper(const string& func, const S& str, size_t* idx, int base, F f)
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63 {
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64 typename S::value_type* ptr = nullptr;
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65 const typename S::value_type* const p = str.c_str();
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66 typename remove_reference<decltype(errno)>::type errno_save = errno;
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67 errno = 0;
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68 V r = f(p, &ptr, base);
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69 swap(errno, errno_save);
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70 if (errno_save == ERANGE)
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71 throw_from_string_out_of_range(func);
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72 if (ptr == p)
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73 throw_from_string_invalid_arg(func);
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74 if (idx)
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75 *idx = static_cast<size_t>(ptr - p);
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76 return r;
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77 }
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78
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79 template<typename V, typename S>
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80 inline
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81 V
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82 as_integer(const string& func, const S& s, size_t* idx, int base);
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83
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84 // string
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85 template<>
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86 inline
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87 int
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88 as_integer(const string& func, const string& s, size_t* idx, int base )
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89 {
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90 // Use long as no Standard string to integer exists.
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91 long r = as_integer_helper<long>( func, s, idx, base, strtol );
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92 if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
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93 throw_from_string_out_of_range(func);
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94 return static_cast<int>(r);
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95 }
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96
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97 template<>
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98 inline
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99 long
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100 as_integer(const string& func, const string& s, size_t* idx, int base )
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101 {
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102 return as_integer_helper<long>( func, s, idx, base, strtol );
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103 }
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104
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105 template<>
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106 inline
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107 unsigned long
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108 as_integer( const string& func, const string& s, size_t* idx, int base )
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109 {
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110 return as_integer_helper<unsigned long>( func, s, idx, base, strtoul );
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111 }
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112
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113 template<>
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114 inline
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115 long long
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116 as_integer( const string& func, const string& s, size_t* idx, int base )
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117 {
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118 return as_integer_helper<long long>( func, s, idx, base, strtoll );
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119 }
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120
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121 template<>
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122 inline
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123 unsigned long long
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124 as_integer( const string& func, const string& s, size_t* idx, int base )
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125 {
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126 return as_integer_helper<unsigned long long>( func, s, idx, base, strtoull );
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127 }
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128
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129 // wstring
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130 template<>
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131 inline
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132 int
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133 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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134 {
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135 // Use long as no Stantard string to integer exists.
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136 long r = as_integer_helper<long>( func, s, idx, base, wcstol );
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137 if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
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138 throw_from_string_out_of_range(func);
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139 return static_cast<int>(r);
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140 }
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141
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142 template<>
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143 inline
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144 long
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145 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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146 {
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147 return as_integer_helper<long>( func, s, idx, base, wcstol );
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148 }
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149
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150 template<>
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151 inline
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152 unsigned long
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153 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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154 {
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155 return as_integer_helper<unsigned long>( func, s, idx, base, wcstoul );
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156 }
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157
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158 template<>
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159 inline
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160 long long
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161 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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162 {
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163 return as_integer_helper<long long>( func, s, idx, base, wcstoll );
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164 }
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165
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166 template<>
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167 inline
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168 unsigned long long
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169 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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170 {
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171 return as_integer_helper<unsigned long long>( func, s, idx, base, wcstoull );
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172 }
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173
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174 // as_float
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175
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176 template<typename V, typename S, typename F>
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177 inline
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178 V
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179 as_float_helper(const string& func, const S& str, size_t* idx, F f )
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180 {
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181 typename S::value_type* ptr = nullptr;
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182 const typename S::value_type* const p = str.c_str();
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183 typename remove_reference<decltype(errno)>::type errno_save = errno;
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184 errno = 0;
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185 V r = f(p, &ptr);
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186 swap(errno, errno_save);
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187 if (errno_save == ERANGE)
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188 throw_from_string_out_of_range(func);
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189 if (ptr == p)
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190 throw_from_string_invalid_arg(func);
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191 if (idx)
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192 *idx = static_cast<size_t>(ptr - p);
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193 return r;
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194 }
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195
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196 template<typename V, typename S>
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197 inline
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198 V as_float( const string& func, const S& s, size_t* idx = nullptr );
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199
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200 template<>
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201 inline
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202 float
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203 as_float( const string& func, const string& s, size_t* idx )
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204 {
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205 return as_float_helper<float>( func, s, idx, strtof );
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206 }
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207
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208 template<>
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209 inline
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210 double
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211 as_float(const string& func, const string& s, size_t* idx )
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212 {
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213 return as_float_helper<double>( func, s, idx, strtod );
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214 }
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215
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216 template<>
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217 inline
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218 long double
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219 as_float( const string& func, const string& s, size_t* idx )
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220 {
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221 return as_float_helper<long double>( func, s, idx, strtold );
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222 }
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223
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224 template<>
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225 inline
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226 float
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227 as_float( const string& func, const wstring& s, size_t* idx )
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228 {
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229 return as_float_helper<float>( func, s, idx, wcstof );
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230 }
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231
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232 template<>
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233 inline
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234 double
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235 as_float( const string& func, const wstring& s, size_t* idx )
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236 {
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237 return as_float_helper<double>( func, s, idx, wcstod );
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238 }
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239
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240 template<>
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241 inline
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242 long double
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243 as_float( const string& func, const wstring& s, size_t* idx )
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244 {
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245 return as_float_helper<long double>( func, s, idx, wcstold );
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246 }
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247
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248 } // unnamed namespace
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249
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250 int
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251 stoi(const string& str, size_t* idx, int base)
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252 {
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253 return as_integer<int>( "stoi", str, idx, base );
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254 }
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255
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256 int
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257 stoi(const wstring& str, size_t* idx, int base)
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258 {
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259 return as_integer<int>( "stoi", str, idx, base );
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260 }
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261
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262 long
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263 stol(const string& str, size_t* idx, int base)
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264 {
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265 return as_integer<long>( "stol", str, idx, base );
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266 }
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267
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268 long
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269 stol(const wstring& str, size_t* idx, int base)
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270 {
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271 return as_integer<long>( "stol", str, idx, base );
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272 }
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273
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274 unsigned long
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275 stoul(const string& str, size_t* idx, int base)
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276 {
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277 return as_integer<unsigned long>( "stoul", str, idx, base );
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278 }
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279
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280 unsigned long
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281 stoul(const wstring& str, size_t* idx, int base)
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282 {
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283 return as_integer<unsigned long>( "stoul", str, idx, base );
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284 }
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285
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286 long long
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287 stoll(const string& str, size_t* idx, int base)
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288 {
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289 return as_integer<long long>( "stoll", str, idx, base );
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290 }
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291
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292 long long
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293 stoll(const wstring& str, size_t* idx, int base)
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294 {
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295 return as_integer<long long>( "stoll", str, idx, base );
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296 }
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297
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298 unsigned long long
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299 stoull(const string& str, size_t* idx, int base)
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300 {
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301 return as_integer<unsigned long long>( "stoull", str, idx, base );
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302 }
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303
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304 unsigned long long
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305 stoull(const wstring& str, size_t* idx, int base)
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306 {
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307 return as_integer<unsigned long long>( "stoull", str, idx, base );
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308 }
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309
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310 float
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311 stof(const string& str, size_t* idx)
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312 {
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313 return as_float<float>( "stof", str, idx );
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314 }
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315
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316 float
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317 stof(const wstring& str, size_t* idx)
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318 {
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319 return as_float<float>( "stof", str, idx );
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320 }
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321
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322 double
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323 stod(const string& str, size_t* idx)
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324 {
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325 return as_float<double>( "stod", str, idx );
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326 }
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327
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328 double
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329 stod(const wstring& str, size_t* idx)
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330 {
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331 return as_float<double>( "stod", str, idx );
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332 }
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333
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334 long double
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335 stold(const string& str, size_t* idx)
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336 {
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337 return as_float<long double>( "stold", str, idx );
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338 }
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339
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340 long double
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341 stold(const wstring& str, size_t* idx)
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342 {
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343 return as_float<long double>( "stold", str, idx );
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344 }
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345
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346 // to_string
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347
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348 namespace
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349 {
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350
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351 // as_string
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352
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353 template<typename S, typename P, typename V >
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354 inline
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355 S
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356 as_string(P sprintf_like, S s, const typename S::value_type* fmt, V a)
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357 {
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358 typedef typename S::size_type size_type;
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359 size_type available = s.size();
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360 while (true)
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361 {
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362 int status = sprintf_like(&s[0], available + 1, fmt, a);
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363 if ( status >= 0 )
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364 {
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365 size_type used = static_cast<size_type>(status);
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366 if ( used <= available )
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367 {
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368 s.resize( used );
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369 break;
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370 }
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371 available = used; // Assume this is advice of how much space we need.
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372 }
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373 else
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374 available = available * 2 + 1;
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375 s.resize(available);
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376 }
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377 return s;
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378 }
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379
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380 template <class S>
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381 struct initial_string;
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382
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383 template <>
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384 struct initial_string<string>
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385 {
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386 string
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387 operator()() const
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388 {
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389 string s;
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390 s.resize(s.capacity());
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391 return s;
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392 }
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393 };
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394
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395 template <>
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396 struct initial_string<wstring>
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397 {
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398 wstring
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399 operator()() const
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400 {
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401 wstring s(20, wchar_t());
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402 s.resize(s.capacity());
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403 return s;
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404 }
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405 };
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406
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407 typedef int (*wide_printf)(wchar_t* __restrict, size_t, const wchar_t*__restrict, ...);
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408
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409 inline
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410 wide_printf
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411 get_swprintf()
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412 {
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413 #ifndef _LIBCPP_MSVCRT
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414 return swprintf;
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415 #else
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416 return static_cast<int (__cdecl*)(wchar_t* __restrict, size_t, const wchar_t*__restrict, ...)>(_snwprintf);
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417 #endif
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418 }
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419
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420 template <typename S, typename V>
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421 S i_to_string(const V v)
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422 {
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423 // numeric_limits::digits10 returns value less on 1 than desired for unsigned numbers.
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424 // For example, for 1-byte unsigned value digits10 is 2 (999 can not be represented),
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425 // so we need +1 here.
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426 constexpr size_t bufsize = numeric_limits<V>::digits10 + 2; // +1 for minus, +1 for digits10
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427 char buf[bufsize];
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428 const auto res = to_chars(buf, buf + bufsize, v);
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429 _LIBCPP_ASSERT(res.ec == errc(), "bufsize must be large enough to accomodate the value");
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430 return S(buf, res.ptr);
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431 }
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432
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433 } // unnamed namespace
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434
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435 string to_string (int val) { return i_to_string< string>(val); }
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436 string to_string (long val) { return i_to_string< string>(val); }
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437 string to_string (long long val) { return i_to_string< string>(val); }
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438 string to_string (unsigned val) { return i_to_string< string>(val); }
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439 string to_string (unsigned long val) { return i_to_string< string>(val); }
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440 string to_string (unsigned long long val) { return i_to_string< string>(val); }
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441
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442 wstring to_wstring(int val) { return i_to_string<wstring>(val); }
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443 wstring to_wstring(long val) { return i_to_string<wstring>(val); }
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444 wstring to_wstring(long long val) { return i_to_string<wstring>(val); }
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445 wstring to_wstring(unsigned val) { return i_to_string<wstring>(val); }
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446 wstring to_wstring(unsigned long val) { return i_to_string<wstring>(val); }
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447 wstring to_wstring(unsigned long long val) { return i_to_string<wstring>(val); }
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448
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449
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450 string to_string (float val) { return as_string(snprintf, initial_string< string>()(), "%f", val); }
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451 string to_string (double val) { return as_string(snprintf, initial_string< string>()(), "%f", val); }
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452 string to_string (long double val) { return as_string(snprintf, initial_string< string>()(), "%Lf", val); }
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453
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454 wstring to_wstring(float val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%f", val); }
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455 wstring to_wstring(double val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%f", val); }
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456 wstring to_wstring(long double val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%Lf", val); }
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457
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458 _LIBCPP_END_NAMESPACE_STD
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