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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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223
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23 #define _LIBCPP_EXTERN_TEMPLATE_DEFINE(...) template __VA_ARGS__;
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173
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24 #ifdef _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
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25 _LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
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26 _LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
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27 #else
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28 _LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, char)
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29 _LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_EXTERN_TEMPLATE_DEFINE, wchar_t)
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30 #endif
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223
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31 #undef _LIBCPP_EXTERN_TEMPLATE_DEFINE
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150
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32
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223
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33 template string operator+<char, char_traits<char>, allocator<char> >(char const*, string const&);
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150
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34
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35 namespace
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36 {
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37
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38 template<typename T>
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39 inline
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40 void throw_helper( const string& msg )
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41 {
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42 #ifndef _LIBCPP_NO_EXCEPTIONS
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43 throw T( msg );
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44 #else
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45 fprintf(stderr, "%s\n", msg.c_str());
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46 _VSTD::abort();
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47 #endif
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48 }
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49
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50 inline
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51 void throw_from_string_out_of_range( const string& func )
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52 {
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53 throw_helper<out_of_range>(func + ": out of range");
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54 }
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55
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56 inline
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57 void throw_from_string_invalid_arg( const string& func )
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58 {
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59 throw_helper<invalid_argument>(func + ": no conversion");
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60 }
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61
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62 // as_integer
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63
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64 template<typename V, typename S, typename F>
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65 inline
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66 V
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67 as_integer_helper(const string& func, const S& str, size_t* idx, int base, F f)
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68 {
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69 typename S::value_type* ptr = nullptr;
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70 const typename S::value_type* const p = str.c_str();
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71 typename remove_reference<decltype(errno)>::type errno_save = errno;
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72 errno = 0;
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73 V r = f(p, &ptr, base);
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74 swap(errno, errno_save);
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75 if (errno_save == ERANGE)
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76 throw_from_string_out_of_range(func);
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77 if (ptr == p)
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78 throw_from_string_invalid_arg(func);
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79 if (idx)
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80 *idx = static_cast<size_t>(ptr - p);
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81 return r;
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82 }
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83
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84 template<typename V, typename S>
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85 inline
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86 V
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87 as_integer(const string& func, const S& s, size_t* idx, int base);
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88
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89 // string
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90 template<>
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91 inline
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92 int
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93 as_integer(const string& func, const string& s, size_t* idx, int base )
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94 {
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95 // Use long as no Standard string to integer exists.
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96 long r = as_integer_helper<long>( func, s, idx, base, strtol );
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97 if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
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98 throw_from_string_out_of_range(func);
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99 return static_cast<int>(r);
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100 }
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101
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102 template<>
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103 inline
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104 long
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105 as_integer(const string& func, const string& s, size_t* idx, int base )
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106 {
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107 return as_integer_helper<long>( func, s, idx, base, strtol );
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108 }
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109
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110 template<>
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111 inline
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112 unsigned long
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113 as_integer( const string& func, const string& s, size_t* idx, int base )
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114 {
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115 return as_integer_helper<unsigned long>( func, s, idx, base, strtoul );
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116 }
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117
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118 template<>
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119 inline
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120 long long
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121 as_integer( const string& func, const string& s, size_t* idx, int base )
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122 {
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123 return as_integer_helper<long long>( func, s, idx, base, strtoll );
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124 }
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125
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126 template<>
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127 inline
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128 unsigned long long
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129 as_integer( const string& func, const string& s, size_t* idx, int base )
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130 {
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131 return as_integer_helper<unsigned long long>( func, s, idx, base, strtoull );
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132 }
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133
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134 // wstring
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135 template<>
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136 inline
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137 int
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138 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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139 {
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140 // Use long as no Stantard string to integer exists.
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141 long r = as_integer_helper<long>( func, s, idx, base, wcstol );
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142 if (r < numeric_limits<int>::min() || numeric_limits<int>::max() < r)
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143 throw_from_string_out_of_range(func);
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144 return static_cast<int>(r);
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145 }
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146
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147 template<>
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148 inline
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149 long
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150 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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151 {
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152 return as_integer_helper<long>( func, s, idx, base, wcstol );
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153 }
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154
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155 template<>
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156 inline
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157 unsigned long
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158 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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159 {
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160 return as_integer_helper<unsigned long>( func, s, idx, base, wcstoul );
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161 }
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162
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163 template<>
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164 inline
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165 long long
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166 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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167 {
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168 return as_integer_helper<long long>( func, s, idx, base, wcstoll );
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169 }
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170
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171 template<>
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172 inline
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173 unsigned long long
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174 as_integer( const string& func, const wstring& s, size_t* idx, int base )
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175 {
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176 return as_integer_helper<unsigned long long>( func, s, idx, base, wcstoull );
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177 }
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178
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179 // as_float
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180
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181 template<typename V, typename S, typename F>
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182 inline
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183 V
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184 as_float_helper(const string& func, const S& str, size_t* idx, F f )
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185 {
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186 typename S::value_type* ptr = nullptr;
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187 const typename S::value_type* const p = str.c_str();
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188 typename remove_reference<decltype(errno)>::type errno_save = errno;
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189 errno = 0;
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190 V r = f(p, &ptr);
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191 swap(errno, errno_save);
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192 if (errno_save == ERANGE)
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193 throw_from_string_out_of_range(func);
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194 if (ptr == p)
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195 throw_from_string_invalid_arg(func);
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196 if (idx)
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197 *idx = static_cast<size_t>(ptr - p);
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198 return r;
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199 }
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200
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201 template<typename V, typename S>
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202 inline
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203 V as_float( const string& func, const S& s, size_t* idx = nullptr );
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204
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205 template<>
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206 inline
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207 float
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208 as_float( const string& func, const string& s, size_t* idx )
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209 {
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210 return as_float_helper<float>( func, s, idx, strtof );
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211 }
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212
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213 template<>
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214 inline
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215 double
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216 as_float(const string& func, const string& s, size_t* idx )
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217 {
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218 return as_float_helper<double>( func, s, idx, strtod );
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219 }
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220
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221 template<>
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222 inline
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223 long double
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224 as_float( const string& func, const string& s, size_t* idx )
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225 {
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226 return as_float_helper<long double>( func, s, idx, strtold );
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227 }
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228
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229 template<>
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230 inline
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231 float
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232 as_float( const string& func, const wstring& s, size_t* idx )
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233 {
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234 return as_float_helper<float>( func, s, idx, wcstof );
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235 }
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236
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237 template<>
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238 inline
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239 double
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240 as_float( const string& func, const wstring& s, size_t* idx )
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241 {
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242 return as_float_helper<double>( func, s, idx, wcstod );
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243 }
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244
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245 template<>
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246 inline
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247 long double
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248 as_float( const string& func, const wstring& s, size_t* idx )
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249 {
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250 return as_float_helper<long double>( func, s, idx, wcstold );
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251 }
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252
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253 } // unnamed namespace
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254
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255 int
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256 stoi(const string& str, size_t* idx, int base)
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257 {
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258 return as_integer<int>( "stoi", str, idx, base );
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259 }
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260
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261 int
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262 stoi(const wstring& str, size_t* idx, int base)
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263 {
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264 return as_integer<int>( "stoi", str, idx, base );
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265 }
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266
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267 long
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268 stol(const string& str, size_t* idx, int base)
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269 {
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270 return as_integer<long>( "stol", str, idx, base );
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271 }
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272
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273 long
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274 stol(const wstring& str, size_t* idx, int base)
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275 {
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276 return as_integer<long>( "stol", str, idx, base );
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277 }
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278
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279 unsigned long
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280 stoul(const string& str, size_t* idx, int base)
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281 {
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282 return as_integer<unsigned long>( "stoul", str, idx, base );
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283 }
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284
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285 unsigned long
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286 stoul(const wstring& str, size_t* idx, int base)
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287 {
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288 return as_integer<unsigned long>( "stoul", str, idx, base );
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289 }
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290
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291 long long
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292 stoll(const string& str, size_t* idx, int base)
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293 {
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294 return as_integer<long long>( "stoll", str, idx, base );
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295 }
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296
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297 long long
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298 stoll(const wstring& str, size_t* idx, int base)
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299 {
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300 return as_integer<long long>( "stoll", str, idx, base );
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301 }
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302
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303 unsigned long long
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304 stoull(const string& str, size_t* idx, int base)
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305 {
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306 return as_integer<unsigned long long>( "stoull", str, idx, base );
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307 }
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308
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309 unsigned long long
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310 stoull(const wstring& str, size_t* idx, int base)
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311 {
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312 return as_integer<unsigned long long>( "stoull", str, idx, base );
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313 }
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314
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315 float
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316 stof(const string& str, size_t* idx)
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317 {
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318 return as_float<float>( "stof", str, idx );
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319 }
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320
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321 float
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322 stof(const wstring& str, size_t* idx)
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323 {
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324 return as_float<float>( "stof", str, idx );
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325 }
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326
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327 double
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328 stod(const string& str, size_t* idx)
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329 {
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330 return as_float<double>( "stod", str, idx );
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331 }
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332
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333 double
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334 stod(const wstring& str, size_t* idx)
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335 {
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336 return as_float<double>( "stod", str, idx );
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337 }
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338
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339 long double
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340 stold(const string& str, size_t* idx)
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341 {
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342 return as_float<long double>( "stold", str, idx );
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343 }
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344
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345 long double
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346 stold(const wstring& str, size_t* idx)
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347 {
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348 return as_float<long double>( "stold", str, idx );
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349 }
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350
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351 // to_string
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352
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353 namespace
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354 {
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355
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356 // as_string
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357
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358 template<typename S, typename P, typename V >
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359 inline
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360 S
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361 as_string(P sprintf_like, S s, const typename S::value_type* fmt, V a)
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362 {
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363 typedef typename S::size_type size_type;
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364 size_type available = s.size();
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365 while (true)
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366 {
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367 int status = sprintf_like(&s[0], available + 1, fmt, a);
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368 if ( status >= 0 )
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369 {
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370 size_type used = static_cast<size_type>(status);
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371 if ( used <= available )
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372 {
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373 s.resize( used );
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374 break;
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375 }
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376 available = used; // Assume this is advice of how much space we need.
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377 }
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378 else
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379 available = available * 2 + 1;
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380 s.resize(available);
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381 }
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382 return s;
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383 }
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384
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385 template <class S>
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386 struct initial_string;
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387
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388 template <>
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389 struct initial_string<string>
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390 {
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391 string
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392 operator()() const
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393 {
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394 string s;
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395 s.resize(s.capacity());
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396 return s;
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397 }
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398 };
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399
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400 template <>
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401 struct initial_string<wstring>
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402 {
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403 wstring
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404 operator()() const
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405 {
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406 wstring s(20, wchar_t());
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407 s.resize(s.capacity());
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408 return s;
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409 }
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410 };
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411
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412 typedef int (*wide_printf)(wchar_t* __restrict, size_t, const wchar_t*__restrict, ...);
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413
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414 inline
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415 wide_printf
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416 get_swprintf()
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417 {
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418 #ifndef _LIBCPP_MSVCRT
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419 return swprintf;
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420 #else
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421 return static_cast<int (__cdecl*)(wchar_t* __restrict, size_t, const wchar_t*__restrict, ...)>(_snwprintf);
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422 #endif
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423 }
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424
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425 template <typename S, typename V>
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223
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426 S i_to_string(V v)
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150
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427 {
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428 // numeric_limits::digits10 returns value less on 1 than desired for unsigned numbers.
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429 // For example, for 1-byte unsigned value digits10 is 2 (999 can not be represented),
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430 // so we need +1 here.
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431 constexpr size_t bufsize = numeric_limits<V>::digits10 + 2; // +1 for minus, +1 for digits10
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432 char buf[bufsize];
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433 const auto res = to_chars(buf, buf + bufsize, v);
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434 _LIBCPP_ASSERT(res.ec == errc(), "bufsize must be large enough to accomodate the value");
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435 return S(buf, res.ptr);
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436 }
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437
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438 } // unnamed namespace
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439
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440 string to_string (int val) { return i_to_string< string>(val); }
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441 string to_string (long val) { return i_to_string< string>(val); }
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442 string to_string (long long val) { return i_to_string< string>(val); }
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443 string to_string (unsigned val) { return i_to_string< string>(val); }
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444 string to_string (unsigned long val) { return i_to_string< string>(val); }
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445 string to_string (unsigned long long val) { return i_to_string< string>(val); }
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446
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447 wstring to_wstring(int val) { return i_to_string<wstring>(val); }
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448 wstring to_wstring(long val) { return i_to_string<wstring>(val); }
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449 wstring to_wstring(long long val) { return i_to_string<wstring>(val); }
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450 wstring to_wstring(unsigned val) { return i_to_string<wstring>(val); }
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451 wstring to_wstring(unsigned long val) { return i_to_string<wstring>(val); }
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452 wstring to_wstring(unsigned long long val) { return i_to_string<wstring>(val); }
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453
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454
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455 string to_string (float val) { return as_string(snprintf, initial_string< string>()(), "%f", val); }
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456 string to_string (double val) { return as_string(snprintf, initial_string< string>()(), "%f", val); }
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457 string to_string (long double val) { return as_string(snprintf, initial_string< string>()(), "%Lf", val); }
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458
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459 wstring to_wstring(float val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%f", val); }
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460 wstring to_wstring(double val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%f", val); }
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461 wstring to_wstring(long double val) { return as_string(get_swprintf(), initial_string<wstring>()(), L"%Lf", val); }
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462
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463 _LIBCPP_END_NAMESPACE_STD
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