| 1 | /* Convert string representation of a number into an integer value.
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| 2 |
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| 3 | Copyright (C) 1991-1992, 1994-1999, 2003, 2005-2007, 2009-2021 Free Software
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| 4 | Foundation, Inc.
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| 5 |
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| 6 | NOTE: The canonical source of this file is maintained with the GNU C
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| 7 | Library. Bugs can be reported to bug-glibc@gnu.org.
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| 8 |
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| 9 | This file is free software: you can redistribute it and/or modify
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| 10 | it under the terms of the GNU Lesser General Public License as
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| 11 | published by the Free Software Foundation; either version 3 of the
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| 12 | License, or (at your option) any later version.
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| 13 |
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| 14 | This file is distributed in the hope that it will be useful,
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| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 17 | GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License
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| 20 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 21 |
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| 22 | #ifdef _LIBC
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| 23 | # define USE_NUMBER_GROUPING
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| 24 | #else
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| 25 | # include <config.h>
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| 26 | #endif
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| 27 |
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| 28 | #include <ctype.h>
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| 29 | #include <errno.h>
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| 30 | #ifndef __set_errno
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| 31 | # define __set_errno(Val) errno = (Val)
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| 32 | #endif
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| 33 |
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| 34 | #include <limits.h>
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| 35 | #include <stddef.h>
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| 36 | #include <stdlib.h>
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| 37 | #include <string.h>
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| 38 |
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| 39 | #ifdef USE_NUMBER_GROUPING
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| 40 | # include "../locale/localeinfo.h"
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| 41 | #endif
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| 42 |
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| 43 | /* Nonzero if we are defining 'strtoul' or 'strtoull', operating on
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| 44 | unsigned integers. */
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| 45 | #ifndef UNSIGNED
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| 46 | # define UNSIGNED 0
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| 47 | # define INT LONG int
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| 48 | #else
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| 49 | # define INT unsigned LONG int
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| 50 | #endif
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| 51 |
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| 52 | /* Determine the name. */
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| 53 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 54 | # undef strtol
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| 55 | # if UNSIGNED
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| 56 | # ifdef USE_WIDE_CHAR
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| 57 | # ifdef QUAD
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| 58 | # define strtol __wcstoull_l
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| 59 | # else
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| 60 | # define strtol __wcstoul_l
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| 61 | # endif
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| 62 | # else
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| 63 | # ifdef QUAD
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| 64 | # define strtol __strtoull_l
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| 65 | # else
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| 66 | # define strtol __strtoul_l
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| 67 | # endif
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| 68 | # endif
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| 69 | # else
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| 70 | # ifdef USE_WIDE_CHAR
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| 71 | # ifdef QUAD
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| 72 | # define strtol __wcstoll_l
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| 73 | # else
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| 74 | # define strtol __wcstol_l
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| 75 | # endif
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| 76 | # else
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| 77 | # ifdef QUAD
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| 78 | # define strtol __strtoll_l
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| 79 | # else
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| 80 | # define strtol __strtol_l
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| 81 | # endif
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| 82 | # endif
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| 83 | # endif
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| 84 | #else
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| 85 | # if UNSIGNED
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| 86 | # undef strtol
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| 87 | # ifdef USE_WIDE_CHAR
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| 88 | # ifdef QUAD
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| 89 | # define strtol wcstoull
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| 90 | # else
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| 91 | # define strtol wcstoul
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| 92 | # endif
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| 93 | # else
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| 94 | # ifdef QUAD
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| 95 | # define strtol strtoull
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| 96 | # else
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| 97 | # define strtol strtoul
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| 98 | # endif
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| 99 | # endif
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| 100 | # else
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| 101 | # ifdef USE_WIDE_CHAR
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| 102 | # undef strtol
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| 103 | # ifdef QUAD
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| 104 | # define strtol wcstoll
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| 105 | # else
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| 106 | # define strtol wcstol
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| 107 | # endif
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| 108 | # else
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| 109 | # ifdef QUAD
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| 110 | # undef strtol
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| 111 | # define strtol strtoll
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| 112 | # endif
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| 113 | # endif
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| 114 | # endif
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| 115 | #endif
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| 116 |
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| 117 | /* If QUAD is defined, we are defining 'strtoll' or 'strtoull',
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| 118 | operating on 'long long int's. */
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| 119 | #ifdef QUAD
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| 120 | # define LONG long long
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| 121 | # define STRTOL_LONG_MIN LLONG_MIN
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| 122 | # define STRTOL_LONG_MAX LLONG_MAX
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| 123 | # define STRTOL_ULONG_MAX ULLONG_MAX
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| 124 | # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
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| 125 | /* Work around gcc bug with using this constant. */
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| 126 | static const unsigned long long int maxquad = ULLONG_MAX;
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| 127 | # undef STRTOL_ULONG_MAX
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| 128 | # define STRTOL_ULONG_MAX maxquad
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| 129 | # endif
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| 130 | #else
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| 131 | # define LONG long
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| 132 | # define STRTOL_LONG_MIN LONG_MIN
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| 133 | # define STRTOL_LONG_MAX LONG_MAX
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| 134 | # define STRTOL_ULONG_MAX ULONG_MAX
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| 135 | #endif
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| 136 |
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| 137 |
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| 138 | #ifdef USE_NUMBER_GROUPING
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| 139 | # define GROUP_PARAM_PROTO , int group
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| 140 | #else
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| 141 | # define GROUP_PARAM_PROTO
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| 142 | #endif
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| 143 |
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| 144 | /* We use this code also for the extended locale handling where the
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| 145 | function gets as an additional argument the locale which has to be
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| 146 | used. To access the values we have to redefine the _NL_CURRENT
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| 147 | macro. */
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| 148 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 149 | # undef _NL_CURRENT
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| 150 | # define _NL_CURRENT(category, item) \
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| 151 | (current->values[_NL_ITEM_INDEX (item)].string)
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| 152 | # define LOCALE_PARAM , loc
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| 153 | # define LOCALE_PARAM_PROTO , __locale_t loc
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| 154 | #else
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| 155 | # define LOCALE_PARAM
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| 156 | # define LOCALE_PARAM_PROTO
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| 157 | #endif
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| 158 |
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| 159 | #ifdef USE_WIDE_CHAR
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| 160 | # include <wchar.h>
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| 161 | # include <wctype.h>
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| 162 | # define L_(Ch) L##Ch
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| 163 | # define UCHAR_TYPE wint_t
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| 164 | # define STRING_TYPE wchar_t
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| 165 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 166 | # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
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| 167 | # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
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| 168 | # define TOUPPER(Ch) __towupper_l ((Ch), loc)
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| 169 | # else
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| 170 | # define ISSPACE(Ch) iswspace (Ch)
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| 171 | # define ISALPHA(Ch) iswalpha (Ch)
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| 172 | # define TOUPPER(Ch) towupper (Ch)
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| 173 | # endif
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| 174 | #else
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| 175 | # define L_(Ch) Ch
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| 176 | # define UCHAR_TYPE unsigned char
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| 177 | # define STRING_TYPE char
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| 178 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 179 | # define ISSPACE(Ch) __isspace_l ((unsigned char) (Ch), loc)
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| 180 | # define ISALPHA(Ch) __isalpha_l ((unsigned char) (Ch), loc)
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| 181 | # define TOUPPER(Ch) __toupper_l ((unsigned char) (Ch), loc)
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| 182 | # else
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| 183 | # define ISSPACE(Ch) isspace ((unsigned char) (Ch))
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| 184 | # define ISALPHA(Ch) isalpha ((unsigned char) (Ch))
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| 185 | # define TOUPPER(Ch) toupper ((unsigned char) (Ch))
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| 186 | # endif
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| 187 | #endif
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| 188 |
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| 189 | #ifdef USE_NUMBER_GROUPING
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| 190 | # define INTERNAL(X) INTERNAL1(X)
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| 191 | # define INTERNAL1(X) __##X##_internal
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| 192 | # define WEAKNAME(X) WEAKNAME1(X)
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| 193 | #else
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| 194 | # define INTERNAL(X) X
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| 195 | #endif
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| 196 |
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| 197 | #ifdef USE_NUMBER_GROUPING
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| 198 | /* This file defines a function to check for correct grouping. */
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| 199 | # include "grouping.h"
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| 200 | #endif
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| 201 |
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| 202 |
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| 203 |
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| 204 | /* Convert NPTR to an 'unsigned long int' or 'long int' in base BASE.
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| 205 | If BASE is 0 the base is determined by the presence of a leading
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| 206 | zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
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| 207 | If BASE is < 2 or > 36, it is reset to 10.
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| 208 | If ENDPTR is not NULL, a pointer to the character after the last
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| 209 | one converted is stored in *ENDPTR. */
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| 210 |
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| 211 | INT
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| 212 | INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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| 213 | int base GROUP_PARAM_PROTO LOCALE_PARAM_PROTO)
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| 214 | {
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| 215 | int negative;
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| 216 | register unsigned LONG int cutoff;
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| 217 | register unsigned int cutlim;
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| 218 | register unsigned LONG int i;
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| 219 | register const STRING_TYPE *s;
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| 220 | register UCHAR_TYPE c;
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| 221 | const STRING_TYPE *save, *end;
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| 222 | int overflow;
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| 223 |
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| 224 | #ifdef USE_NUMBER_GROUPING
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| 225 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 226 | struct locale_data *current = loc->__locales[LC_NUMERIC];
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| 227 | # endif
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| 228 | /* The thousands character of the current locale. */
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| 229 | wchar_t thousands = L'\0';
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| 230 | /* The numeric grouping specification of the current locale,
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| 231 | in the format described in <locale.h>. */
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| 232 | const char *grouping;
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| 233 |
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| 234 | if (group)
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| 235 | {
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| 236 | grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
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| 237 | if (*grouping <= 0 || *grouping == CHAR_MAX)
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| 238 | grouping = NULL;
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| 239 | else
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| 240 | {
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| 241 | /* Figure out the thousands separator character. */
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| 242 | # if defined _LIBC || defined _HAVE_BTOWC
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| 243 | thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
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| 244 | if (thousands == WEOF)
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| 245 | thousands = L'\0';
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| 246 | # endif
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| 247 | if (thousands == L'\0')
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| 248 | grouping = NULL;
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| 249 | }
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| 250 | }
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| 251 | else
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| 252 | grouping = NULL;
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| 253 | #endif
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| 254 |
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| 255 | if (base < 0 || base == 1 || base > 36)
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| 256 | {
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| 257 | __set_errno (EINVAL);
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| 258 | return 0;
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| 259 | }
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| 260 |
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| 261 | save = s = nptr;
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| 262 |
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| 263 | /* Skip white space. */
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| 264 | while (ISSPACE (*s))
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| 265 | ++s;
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| 266 | if (*s == L_('\0'))
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| 267 | goto noconv;
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| 268 |
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| 269 | /* Check for a sign. */
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| 270 | if (*s == L_('-'))
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| 271 | {
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| 272 | negative = 1;
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| 273 | ++s;
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| 274 | }
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| 275 | else if (*s == L_('+'))
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| 276 | {
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| 277 | negative = 0;
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| 278 | ++s;
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| 279 | }
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| 280 | else
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| 281 | negative = 0;
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| 282 |
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| 283 | /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
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| 284 | if (*s == L_('0'))
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| 285 | {
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| 286 | if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
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| 287 | {
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| 288 | s += 2;
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| 289 | base = 16;
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| 290 | }
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| 291 | else if (base == 0)
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| 292 | base = 8;
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| 293 | }
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| 294 | else if (base == 0)
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| 295 | base = 10;
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| 296 |
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| 297 | /* Save the pointer so we can check later if anything happened. */
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| 298 | save = s;
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| 299 |
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| 300 | #ifdef USE_NUMBER_GROUPING
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| 301 | if (group)
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| 302 | {
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| 303 | /* Find the end of the digit string and check its grouping. */
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| 304 | end = s;
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| 305 | for (c = *end; c != L_('\0'); c = *++end)
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| 306 | if ((wchar_t) c != thousands
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| 307 | && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
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| 308 | && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
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| 309 | break;
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| 310 | if (*s == thousands)
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| 311 | end = s;
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| 312 | else
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| 313 | end = correctly_grouped_prefix (s, end, thousands, grouping);
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| 314 | }
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| 315 | else
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| 316 | #endif
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| 317 | end = NULL;
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| 318 |
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| 319 | cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
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| 320 | cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
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| 321 |
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| 322 | overflow = 0;
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| 323 | i = 0;
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| 324 | for (c = *s; c != L_('\0'); c = *++s)
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| 325 | {
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| 326 | if (s == end)
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| 327 | break;
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| 328 | if (c >= L_('0') && c <= L_('9'))
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| 329 | c -= L_('0');
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| 330 | else if (ISALPHA (c))
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| 331 | c = TOUPPER (c) - L_('A') + 10;
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| 332 | else
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| 333 | break;
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| 334 | if ((int) c >= base)
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| 335 | break;
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| 336 | /* Check for overflow. */
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| 337 | if (i > cutoff || (i == cutoff && c > cutlim))
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| 338 | overflow = 1;
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| 339 | else
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| 340 | {
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| 341 | i *= (unsigned LONG int) base;
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| 342 | i += c;
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| 343 | }
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| 344 | }
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| 345 |
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| 346 | /* Check if anything actually happened. */
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| 347 | if (s == save)
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| 348 | goto noconv;
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| 349 |
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| 350 | /* Store in ENDPTR the address of one character
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| 351 | past the last character we converted. */
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| 352 | if (endptr != NULL)
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| 353 | *endptr = (STRING_TYPE *) s;
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| 354 |
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| 355 | #if !UNSIGNED
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| 356 | /* Check for a value that is within the range of
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| 357 | 'unsigned LONG int', but outside the range of 'LONG int'. */
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| 358 | if (overflow == 0
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| 359 | && i > (negative
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| 360 | ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
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| 361 | : (unsigned LONG int) STRTOL_LONG_MAX))
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| 362 | overflow = 1;
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| 363 | #endif
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| 364 |
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| 365 | if (overflow)
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| 366 | {
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| 367 | __set_errno (ERANGE);
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| 368 | #if UNSIGNED
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| 369 | return STRTOL_ULONG_MAX;
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| 370 | #else
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| 371 | return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
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| 372 | #endif
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| 373 | }
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| 374 |
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| 375 | /* Return the result of the appropriate sign. */
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| 376 | return negative ? -i : i;
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| 377 |
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| 378 | noconv:
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| 379 | /* We must handle a special case here: the base is 0 or 16 and the
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| 380 | first two characters are '0' and 'x', but the rest are no
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| 381 | hexadecimal digits. This is no error case. We return 0 and
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| 382 | ENDPTR points to the 'x'. */
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| 383 | if (endptr != NULL)
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| 384 | {
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| 385 | if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
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| 386 | && save[-2] == L_('0'))
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| 387 | *endptr = (STRING_TYPE *) &save[-1];
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| 388 | else
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| 389 | /* There was no number to convert. */
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| 390 | *endptr = (STRING_TYPE *) nptr;
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| 391 | }
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| 392 |
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| 393 | return 0L;
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| 394 | }
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| 395 | |
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| 396 |
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| 397 | #ifdef USE_NUMBER_GROUPING
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| 398 | /* External user entry point. */
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| 399 |
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| 400 | INT
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| 401 | # ifdef weak_function
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| 402 | weak_function
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| 403 | # endif
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| 404 | strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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| 405 | int base LOCALE_PARAM_PROTO)
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| 406 | {
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| 407 | return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
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| 408 | }
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| 409 | #endif
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