1 | /* Convert string representation of a number into an integer value.
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2 | Copyright (C) 1991, 92, 94, 95, 96, 97, 98, 99 Free Software Foundation, Inc.
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3 | NOTE: The canonical source of this file is maintained with the GNU C
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4 | Library. Bugs can be reported to bug-glibc@gnu.org.
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5 |
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6 | This program is free software; you can redistribute it and/or modify it
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7 | under the terms of the GNU General Public License as published by the
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8 | Free Software Foundation; either version 2, or (at your option) any
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9 | later version.
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10 |
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11 | This program is distributed in the hope that it will be useful,
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | GNU General Public License for more details.
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15 |
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16 | You should have received a copy of the GNU General Public License
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17 | along with this program; if not, write to the Free Software Foundation,
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18 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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19 |
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20 | #if HAVE_CONFIG_H
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21 | # include <config.h>
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22 | #endif
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23 |
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24 | #ifdef _LIBC
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25 | # define USE_NUMBER_GROUPING
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26 | # define STDC_HEADERS
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27 | # define HAVE_LIMITS_H
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28 | #endif
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29 |
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30 | #include <ctype.h>
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31 | #include <errno.h>
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32 | #ifndef errno
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33 | extern int errno;
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34 | #endif
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35 | #ifndef __set_errno
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36 | # define __set_errno(Val) errno = (Val)
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37 | #endif
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38 |
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39 | #ifdef HAVE_LIMITS_H
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40 | # include <limits.h>
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41 | #endif
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42 |
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43 | #ifdef STDC_HEADERS
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44 | # include <stddef.h>
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45 | # include <stdlib.h>
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46 | # include <string.h>
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47 | #else
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48 | # ifndef NULL
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49 | # define NULL 0
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50 | # endif
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51 | #endif
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52 |
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53 | #ifdef USE_NUMBER_GROUPING
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54 | # include "../locale/localeinfo.h"
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55 | #endif
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56 |
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57 | /* Nonzero if we are defining `strtoul' or `strtoull', operating on
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58 | unsigned integers. */
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59 | #ifndef UNSIGNED
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60 | # define UNSIGNED 0
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61 | # define INT LONG int
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62 | #else
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63 | # define INT unsigned LONG int
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64 | #endif
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65 |
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66 | /* Determine the name. */
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67 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL
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68 | # if UNSIGNED
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69 | # ifdef USE_WIDE_CHAR
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70 | # ifdef QUAD
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71 | # define strtol __wcstoull_l
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72 | # else
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73 | # define strtol __wcstoul_l
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74 | # endif
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75 | # else
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76 | # ifdef QUAD
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77 | # define strtol __strtoull_l
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78 | # else
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79 | # define strtol __strtoul_l
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80 | # endif
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81 | # endif
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82 | # else
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83 | # ifdef USE_WIDE_CHAR
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84 | # ifdef QUAD
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85 | # define strtol __wcstoll_l
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86 | # else
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87 | # define strtol __wcstol_l
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88 | # endif
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89 | # else
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90 | # ifdef QUAD
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91 | # define strtol __strtoll_l
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92 | # else
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93 | # define strtol __strtol_l
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94 | # endif
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95 | # endif
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96 | # endif
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97 | #else
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98 | # if UNSIGNED
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99 | # ifdef USE_WIDE_CHAR
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100 | # ifdef QUAD
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101 | # define strtol wcstoull
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102 | # else
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103 | # define strtol wcstoul
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104 | # endif
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105 | # else
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106 | # ifdef QUAD
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107 | # define strtol strtoull
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108 | # else
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109 | # define strtol strtoul
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110 | # endif
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111 | # endif
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112 | # else
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113 | # ifdef USE_WIDE_CHAR
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114 | # ifdef QUAD
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115 | # define strtol wcstoll
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116 | # else
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117 | # define strtol wcstol
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118 | # endif
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119 | # else
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120 | # ifdef QUAD
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121 | # define strtol strtoll
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122 | # endif
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123 | # endif
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124 | # endif
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125 | #endif
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126 |
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127 | /* If QUAD is defined, we are defining `strtoll' or `strtoull',
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128 | operating on `long long int's. */
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129 | #ifdef QUAD
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130 | # define LONG long long
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131 | # define STRTOL_LONG_MIN LONG_LONG_MIN
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132 | # define STRTOL_LONG_MAX LONG_LONG_MAX
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133 | # define STRTOL_ULONG_MAX ULONG_LONG_MAX
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134 |
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135 | /* The extra casts work around common compiler bugs,
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136 | e.g. Cray C 5.0.3.0 when t == time_t. */
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137 | # ifndef TYPE_SIGNED
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138 | # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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139 | # endif
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140 | # ifndef TYPE_MINIMUM
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141 | # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
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142 | ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
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143 | : (t) 0))
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144 | # endif
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145 | # ifndef TYPE_MAXIMUM
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146 | # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
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147 | # endif
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148 |
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149 | # ifndef ULONG_LONG_MAX
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150 | # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
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151 | # endif
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152 | # ifndef LONG_LONG_MAX
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153 | # define LONG_LONG_MAX TYPE_MAXIMUM (long long int)
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154 | # endif
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155 | # ifndef LONG_LONG_MIN
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156 | # define LONG_LONG_MIN TYPE_MINIMUM (long long int)
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157 | # endif
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158 |
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159 | # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
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160 | /* Work around gcc bug with using this constant. */
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161 | static const unsigned long long int maxquad = ULONG_LONG_MAX;
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162 | # undef STRTOL_ULONG_MAX
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163 | # define STRTOL_ULONG_MAX maxquad
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164 | # endif
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165 | #else
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166 | # define LONG long
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167 |
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168 | # ifndef ULONG_MAX
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169 | # define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
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170 | # endif
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171 | # ifndef LONG_MAX
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172 | # define LONG_MAX ((long int) (ULONG_MAX >> 1))
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173 | # endif
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174 | # define STRTOL_LONG_MIN LONG_MIN
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175 | # define STRTOL_LONG_MAX LONG_MAX
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176 | # define STRTOL_ULONG_MAX ULONG_MAX
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177 | #endif
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178 |
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179 |
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180 | /* We use this code also for the extended locale handling where the
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181 | function gets as an additional argument the locale which has to be
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182 | used. To access the values we have to redefine the _NL_CURRENT
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183 | macro. */
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184 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL
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185 | # undef _NL_CURRENT
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186 | # define _NL_CURRENT(category, item) \
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187 | (current->values[_NL_ITEM_INDEX (item)].string)
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188 | # define LOCALE_PARAM , loc
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189 | # define LOCALE_PARAM_DECL __locale_t loc;
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190 | #else
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191 | # define LOCALE_PARAM
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192 | # define LOCALE_PARAM_DECL
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193 | #endif
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194 |
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195 | #if defined _LIBC || defined HAVE_WCHAR_H
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196 | # include <wchar.h>
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197 | #endif
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198 |
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199 | #ifdef USE_WIDE_CHAR
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200 | # include <wctype.h>
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201 | # define L_(Ch) L##Ch
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202 | # define UCHAR_TYPE wint_t
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203 | # define STRING_TYPE wchar_t
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204 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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205 | # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
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206 | # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
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207 | # define TOUPPER(Ch) __towupper_l ((Ch), loc)
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208 | # else
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209 | # define ISSPACE(Ch) iswspace (Ch)
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210 | # define ISALPHA(Ch) iswalpha (Ch)
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211 | # define TOUPPER(Ch) towupper (Ch)
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212 | # endif
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213 | #else
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214 | # if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
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215 | # define IN_CTYPE_DOMAIN(c) 1
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216 | # else
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217 | # define IN_CTYPE_DOMAIN(c) isascii(c)
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218 | # endif
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219 | # define L_(Ch) Ch
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220 | # define UCHAR_TYPE unsigned char
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221 | # define STRING_TYPE char
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222 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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223 | # define ISSPACE(Ch) __isspace_l ((Ch), loc)
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224 | # define ISALPHA(Ch) __isalpha_l ((Ch), loc)
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225 | # define TOUPPER(Ch) __toupper_l ((Ch), loc)
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226 | # else
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227 | # define ISSPACE(Ch) (IN_CTYPE_DOMAIN (Ch) && isspace (Ch))
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228 | # define ISALPHA(Ch) (IN_CTYPE_DOMAIN (Ch) && isalpha (Ch))
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229 | # define TOUPPER(Ch) (IN_CTYPE_DOMAIN (Ch) ? toupper (Ch) : (Ch))
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230 | # endif
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231 | #endif
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232 |
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233 | /* For compilers which are ansi but don't define __STDC__, like SGI
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234 | Irix-4.0.5 cc, also check whether PROTOTYPES is defined. */
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235 | #if defined (__STDC__) || defined (PROTOTYPES)
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236 | # define INTERNAL(X) INTERNAL1(X)
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237 | # define INTERNAL1(X) __##X##_internal
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238 | # define WEAKNAME(X) WEAKNAME1(X)
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239 | #else
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240 | # define INTERNAL(X) __/**/X/**/_internal
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241 | #endif
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242 |
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243 | #ifdef USE_NUMBER_GROUPING
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244 | /* This file defines a function to check for correct grouping. */
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245 | # include "grouping.h"
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246 | #endif
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247 |
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248 |
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249 |
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250 | /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
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251 | If BASE is 0 the base is determined by the presence of a leading
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252 | zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
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253 | If BASE is < 2 or > 36, it is reset to 10.
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254 | If ENDPTR is not NULL, a pointer to the character after the last
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255 | one converted is stored in *ENDPTR. */
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256 |
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257 | INT
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258 | INTERNAL (strtol) (nptr, endptr, base, group LOCALE_PARAM)
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259 | const STRING_TYPE *nptr;
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260 | STRING_TYPE **endptr;
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261 | int base;
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262 | int group;
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263 | LOCALE_PARAM_DECL
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264 | {
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265 | int negative;
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266 | register unsigned LONG int cutoff;
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267 | register unsigned int cutlim;
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268 | register unsigned LONG int i;
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269 | register const STRING_TYPE *s;
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270 | register UCHAR_TYPE c;
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271 | const STRING_TYPE *save, *end;
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272 | int overflow;
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273 |
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274 | #ifdef USE_NUMBER_GROUPING
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275 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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276 | struct locale_data *current = loc->__locales[LC_NUMERIC];
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277 | # endif
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278 | /* The thousands character of the current locale. */
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279 | wchar_t thousands = L'\0';
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280 | /* The numeric grouping specification of the current locale,
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281 | in the format described in <locale.h>. */
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282 | const char *grouping;
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283 |
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284 | if (group)
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285 | {
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286 | grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
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287 | if (*grouping <= 0 || *grouping == CHAR_MAX)
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288 | grouping = NULL;
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289 | else
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290 | {
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291 | /* Figure out the thousands separator character. */
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292 | # if defined _LIBC || defined _HAVE_BTOWC
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293 | thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
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294 | if (thousands == WEOF)
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295 | thousands = L'\0';
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296 | # endif
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297 | if (thousands == L'\0')
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298 | grouping = NULL;
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299 | }
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300 | }
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301 | else
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302 | grouping = NULL;
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303 | #endif
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304 |
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305 | if (base < 0 || base == 1 || base > 36)
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306 | {
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307 | __set_errno (EINVAL);
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308 | return 0;
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309 | }
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310 |
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311 | save = s = nptr;
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312 |
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313 | /* Skip white space. */
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314 | while (ISSPACE (*s))
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315 | ++s;
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316 | if (*s == L_('\0'))
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317 | goto noconv;
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318 |
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319 | /* Check for a sign. */
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320 | if (*s == L_('-'))
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321 | {
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322 | negative = 1;
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323 | ++s;
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324 | }
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325 | else if (*s == L_('+'))
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326 | {
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327 | negative = 0;
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328 | ++s;
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329 | }
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330 | else
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331 | negative = 0;
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332 |
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333 | /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
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334 | if (*s == L_('0'))
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335 | {
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336 | if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
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337 | {
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338 | s += 2;
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339 | base = 16;
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340 | }
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341 | else if (base == 0)
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342 | base = 8;
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343 | }
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344 | else if (base == 0)
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345 | base = 10;
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346 |
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347 | /* Save the pointer so we can check later if anything happened. */
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348 | save = s;
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349 |
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350 | #ifdef USE_NUMBER_GROUPING
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351 | if (group)
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352 | {
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353 | /* Find the end of the digit string and check its grouping. */
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354 | end = s;
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355 | for (c = *end; c != L_('\0'); c = *++end)
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356 | if ((wchar_t) c != thousands
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357 | && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
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358 | && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
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359 | break;
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360 | if (*s == thousands)
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361 | end = s;
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362 | else
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363 | end = correctly_grouped_prefix (s, end, thousands, grouping);
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364 | }
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365 | else
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366 | #endif
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367 | end = NULL;
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368 |
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369 | cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
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370 | cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
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371 |
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372 | overflow = 0;
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373 | i = 0;
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374 | for (c = *s; c != L_('\0'); c = *++s)
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375 | {
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376 | if (s == end)
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377 | break;
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378 | if (c >= L_('0') && c <= L_('9'))
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379 | c -= L_('0');
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380 | else if (ISALPHA (c))
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381 | c = TOUPPER (c) - L_('A') + 10;
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382 | else
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383 | break;
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384 | if ((int) c >= base)
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385 | break;
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386 | /* Check for overflow. */
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387 | if (i > cutoff || (i == cutoff && c > cutlim))
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388 | overflow = 1;
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389 | else
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390 | {
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391 | i *= (unsigned LONG int) base;
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392 | i += c;
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393 | }
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394 | }
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395 |
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396 | /* Check if anything actually happened. */
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397 | if (s == save)
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398 | goto noconv;
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399 |
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400 | /* Store in ENDPTR the address of one character
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401 | past the last character we converted. */
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402 | if (endptr != NULL)
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403 | *endptr = (STRING_TYPE *) s;
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404 |
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405 | #if !UNSIGNED
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406 | /* Check for a value that is within the range of
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407 | `unsigned LONG int', but outside the range of `LONG int'. */
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408 | if (overflow == 0
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409 | && i > (negative
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410 | ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
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411 | : (unsigned LONG int) STRTOL_LONG_MAX))
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412 | overflow = 1;
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413 | #endif
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414 |
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415 | if (overflow)
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416 | {
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417 | __set_errno (ERANGE);
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418 | #if UNSIGNED
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419 | return STRTOL_ULONG_MAX;
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420 | #else
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421 | return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
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422 | #endif
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423 | }
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424 |
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425 | /* Return the result of the appropriate sign. */
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426 | return negative ? -i : i;
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427 |
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428 | noconv:
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429 | /* We must handle a special case here: the base is 0 or 16 and the
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430 | first two characters are '0' and 'x', but the rest are no
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431 | hexadecimal digits. This is no error case. We return 0 and
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432 | ENDPTR points to the `x`. */
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433 | if (endptr != NULL)
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434 | {
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435 | if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
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436 | && save[-2] == L_('0'))
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437 | *endptr = (STRING_TYPE *) &save[-1];
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438 | else
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439 | /* There was no number to convert. */
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440 | *endptr = (STRING_TYPE *) nptr;
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441 | }
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442 |
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443 | return 0L;
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444 | }
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445 | |
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446 |
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447 | /* External user entry point. */
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448 |
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449 | #if _LIBC - 0 == 0
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450 | # undef PARAMS
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451 | # if defined (__STDC__) && __STDC__
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452 | # define PARAMS(Args) Args
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453 | # else
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454 | # define PARAMS(Args) ()
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455 | # endif
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456 |
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457 | /* Prototype. */
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458 | INT strtol PARAMS ((const STRING_TYPE *nptr, STRING_TYPE **endptr, int base));
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459 | #endif
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460 |
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461 |
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462 | INT
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463 | #ifdef weak_function
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464 | weak_function
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465 | #endif
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466 | strtol (nptr, endptr, base LOCALE_PARAM)
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467 | const STRING_TYPE *nptr;
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468 | STRING_TYPE **endptr;
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469 | int base;
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470 | LOCALE_PARAM_DECL
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471 | {
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472 | return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
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473 | }
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