| 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, 1995, 1996, 1997, 1998, 1999, 2003, 2005, 2006
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| 4 | Free Software 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 program is free software; you can redistribute it and/or modify it
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| 10 | under the terms of the GNU General Public License as published by the
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| 11 | Free Software Foundation; either version 2, or (at your option) any
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| 12 | later version.
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| 13 |
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| 14 | This program 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 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 General Public License
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| 20 | along with this program; if not, write to the Free Software Foundation,
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| 21 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 22 |
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| 23 | #ifdef _LIBC
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| 24 | # define USE_NUMBER_GROUPING
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| 25 | #else
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| 26 | # include <config.h>
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| 27 | #endif
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| 28 |
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| 29 | #include <ctype.h>
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| 30 | #include <errno.h>
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| 31 | #ifndef __set_errno
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| 32 | # define __set_errno(Val) errno = (Val)
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| 33 | #endif
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| 34 |
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| 35 | #include <limits.h>
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| 36 | #include <stddef.h>
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| 37 | #include <stdlib.h>
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| 38 | #include <string.h>
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| 39 |
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| 40 | #ifdef USE_NUMBER_GROUPING
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| 41 | # include "../locale/localeinfo.h"
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| 42 | #endif
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| 43 |
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| 44 | /* Nonzero if we are defining `strtoul' or `strtoull', operating on
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| 45 | unsigned integers. */
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| 46 | #ifndef UNSIGNED
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| 47 | # define UNSIGNED 0
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| 48 | # define INT LONG int
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| 49 | #else
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| 50 | # define INT unsigned LONG int
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| 51 | #endif
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| 52 |
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| 53 | /* Determine the name. */
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| 54 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL
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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 | # ifdef USE_WIDE_CHAR
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| 87 | # ifdef QUAD
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| 88 | # define strtol wcstoull
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| 89 | # else
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| 90 | # define strtol wcstoul
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| 91 | # endif
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| 92 | # else
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| 93 | # ifdef QUAD
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| 94 | # define strtol strtoull
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| 95 | # else
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| 96 | # define strtol strtoul
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| 97 | # endif
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| 98 | # endif
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| 99 | # else
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| 100 | # ifdef USE_WIDE_CHAR
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| 101 | # ifdef QUAD
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| 102 | # define strtol wcstoll
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| 103 | # else
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| 104 | # define strtol wcstol
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| 105 | # endif
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| 106 | # else
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| 107 | # ifdef QUAD
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| 108 | # define strtol strtoll
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| 109 | # endif
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| 110 | # endif
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| 111 | # endif
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| 112 | #endif
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| 113 |
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| 114 | /* If QUAD is defined, we are defining `strtoll' or `strtoull',
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| 115 | operating on `long long int's. */
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| 116 | #ifdef QUAD
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| 117 | # define LONG long long
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| 118 | # define STRTOL_LONG_MIN LONG_LONG_MIN
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| 119 | # define STRTOL_LONG_MAX LONG_LONG_MAX
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| 120 | # define STRTOL_ULONG_MAX ULONG_LONG_MAX
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| 121 |
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| 122 | /* The extra casts in the following macros work around compiler bugs,
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| 123 | e.g., in Cray C 5.0.3.0. */
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| 124 |
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| 125 | /* True if negative values of the signed integer type T use two's
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| 126 | complement, ones' complement, or signed magnitude representation,
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| 127 | respectively. Much GNU code assumes two's complement, but some
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| 128 | people like to be portable to all possible C hosts. */
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| 129 | # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
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| 130 | # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
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| 131 | # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
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| 132 |
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| 133 | /* True if the arithmetic type T is signed. */
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| 134 | # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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| 135 |
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| 136 | /* The maximum and minimum values for the integer type T. These
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| 137 | macros have undefined behavior if T is signed and has padding bits.
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| 138 | If this is a problem for you, please let us know how to fix it for
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| 139 | your host. */
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| 140 | # define TYPE_MINIMUM(t) \
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| 141 | ((t) (! TYPE_SIGNED (t) \
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| 142 | ? (t) 0 \
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| 143 | : TYPE_SIGNED_MAGNITUDE (t) \
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| 144 | ? ~ (t) 0 \
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| 145 | : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
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| 146 | # define TYPE_MAXIMUM(t) \
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| 147 | ((t) (! TYPE_SIGNED (t) \
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| 148 | ? (t) -1 \
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| 149 | : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
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| 150 |
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| 151 | # ifndef ULONG_LONG_MAX
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| 152 | # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
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| 153 | # endif
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| 154 | # ifndef LONG_LONG_MAX
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| 155 | # define LONG_LONG_MAX TYPE_MAXIMUM (long long int)
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| 156 | # endif
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| 157 | # ifndef LONG_LONG_MIN
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| 158 | # define LONG_LONG_MIN TYPE_MINIMUM (long long int)
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| 159 | # endif
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| 160 |
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| 161 | # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
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| 162 | /* Work around gcc bug with using this constant. */
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| 163 | static const unsigned long long int maxquad = ULONG_LONG_MAX;
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| 164 | # undef STRTOL_ULONG_MAX
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| 165 | # define STRTOL_ULONG_MAX maxquad
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| 166 | # endif
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| 167 | #else
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| 168 | # define LONG long
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| 169 | # define STRTOL_LONG_MIN LONG_MIN
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| 170 | # define STRTOL_LONG_MAX LONG_MAX
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| 171 | # define STRTOL_ULONG_MAX ULONG_MAX
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| 172 | #endif
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| 173 |
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| 174 |
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| 175 | /* We use this code also for the extended locale handling where the
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| 176 | function gets as an additional argument the locale which has to be
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| 177 | used. To access the values we have to redefine the _NL_CURRENT
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| 178 | macro. */
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| 179 | #ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 180 | # undef _NL_CURRENT
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| 181 | # define _NL_CURRENT(category, item) \
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| 182 | (current->values[_NL_ITEM_INDEX (item)].string)
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| 183 | # define LOCALE_PARAM , loc
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| 184 | # define LOCALE_PARAM_PROTO , __locale_t loc
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| 185 | #else
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| 186 | # define LOCALE_PARAM
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| 187 | # define LOCALE_PARAM_PROTO
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| 188 | #endif
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| 189 |
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| 190 | #if defined _LIBC || defined HAVE_WCHAR_H
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| 191 | # include <wchar.h>
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| 192 | #endif
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| 193 |
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| 194 | #ifdef USE_WIDE_CHAR
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| 195 | # include <wctype.h>
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| 196 | # define L_(Ch) L##Ch
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| 197 | # define UCHAR_TYPE wint_t
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| 198 | # define STRING_TYPE wchar_t
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| 199 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 200 | # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
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| 201 | # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
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| 202 | # define TOUPPER(Ch) __towupper_l ((Ch), loc)
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| 203 | # else
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| 204 | # define ISSPACE(Ch) iswspace (Ch)
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| 205 | # define ISALPHA(Ch) iswalpha (Ch)
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| 206 | # define TOUPPER(Ch) towupper (Ch)
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| 207 | # endif
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| 208 | #else
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| 209 | # define L_(Ch) Ch
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| 210 | # define UCHAR_TYPE unsigned char
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| 211 | # define STRING_TYPE char
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| 212 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 213 | # define ISSPACE(Ch) __isspace_l ((Ch), loc)
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| 214 | # define ISALPHA(Ch) __isalpha_l ((Ch), loc)
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| 215 | # define TOUPPER(Ch) __toupper_l ((Ch), loc)
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| 216 | # else
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| 217 | # define ISSPACE(Ch) isspace (Ch)
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| 218 | # define ISALPHA(Ch) isalpha (Ch)
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| 219 | # define TOUPPER(Ch) toupper (Ch)
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| 220 | # endif
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| 221 | #endif
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| 222 |
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| 223 | #define INTERNAL(X) INTERNAL1(X)
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| 224 | #define INTERNAL1(X) __##X##_internal
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| 225 | #define WEAKNAME(X) WEAKNAME1(X)
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| 226 |
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| 227 | #ifdef USE_NUMBER_GROUPING
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| 228 | /* This file defines a function to check for correct grouping. */
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| 229 | # include "grouping.h"
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| 230 | #endif
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| 231 |
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| 232 |
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| 233 |
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| 234 | /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
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| 235 | If BASE is 0 the base is determined by the presence of a leading
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| 236 | zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
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| 237 | If BASE is < 2 or > 36, it is reset to 10.
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| 238 | If ENDPTR is not NULL, a pointer to the character after the last
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| 239 | one converted is stored in *ENDPTR. */
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| 240 |
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| 241 | INT
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| 242 | INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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| 243 | int base, int group LOCALE_PARAM_PROTO)
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| 244 | {
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| 245 | int negative;
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| 246 | register unsigned LONG int cutoff;
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| 247 | register unsigned int cutlim;
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| 248 | register unsigned LONG int i;
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| 249 | register const STRING_TYPE *s;
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| 250 | register UCHAR_TYPE c;
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| 251 | const STRING_TYPE *save, *end;
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| 252 | int overflow;
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| 253 |
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| 254 | #ifdef USE_NUMBER_GROUPING
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| 255 | # ifdef USE_IN_EXTENDED_LOCALE_MODEL
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| 256 | struct locale_data *current = loc->__locales[LC_NUMERIC];
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| 257 | # endif
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| 258 | /* The thousands character of the current locale. */
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| 259 | wchar_t thousands = L'\0';
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| 260 | /* The numeric grouping specification of the current locale,
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| 261 | in the format described in <locale.h>. */
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| 262 | const char *grouping;
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| 263 |
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| 264 | if (group)
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| 265 | {
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| 266 | grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
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| 267 | if (*grouping <= 0 || *grouping == CHAR_MAX)
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| 268 | grouping = NULL;
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| 269 | else
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| 270 | {
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| 271 | /* Figure out the thousands separator character. */
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| 272 | # if defined _LIBC || defined _HAVE_BTOWC
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| 273 | thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
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| 274 | if (thousands == WEOF)
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| 275 | thousands = L'\0';
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| 276 | # endif
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| 277 | if (thousands == L'\0')
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| 278 | grouping = NULL;
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| 279 | }
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| 280 | }
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| 281 | else
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| 282 | grouping = NULL;
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| 283 | #endif
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| 284 |
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| 285 | if (base < 0 || base == 1 || base > 36)
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| 286 | {
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| 287 | __set_errno (EINVAL);
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| 288 | return 0;
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| 289 | }
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| 290 |
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| 291 | save = s = nptr;
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| 292 |
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| 293 | /* Skip white space. */
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| 294 | while (ISSPACE (*s))
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| 295 | ++s;
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| 296 | if (*s == L_('\0'))
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| 297 | goto noconv;
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| 298 |
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| 299 | /* Check for a sign. */
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| 300 | if (*s == L_('-'))
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| 301 | {
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| 302 | negative = 1;
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| 303 | ++s;
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| 304 | }
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| 305 | else if (*s == L_('+'))
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| 306 | {
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| 307 | negative = 0;
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| 308 | ++s;
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| 309 | }
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| 310 | else
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| 311 | negative = 0;
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| 312 |
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| 313 | /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
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| 314 | if (*s == L_('0'))
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| 315 | {
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| 316 | if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
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| 317 | {
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| 318 | s += 2;
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| 319 | base = 16;
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| 320 | }
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| 321 | else if (base == 0)
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| 322 | base = 8;
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| 323 | }
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| 324 | else if (base == 0)
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| 325 | base = 10;
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| 326 |
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| 327 | /* Save the pointer so we can check later if anything happened. */
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| 328 | save = s;
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| 329 |
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| 330 | #ifdef USE_NUMBER_GROUPING
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| 331 | if (group)
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| 332 | {
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| 333 | /* Find the end of the digit string and check its grouping. */
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| 334 | end = s;
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| 335 | for (c = *end; c != L_('\0'); c = *++end)
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| 336 | if ((wchar_t) c != thousands
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| 337 | && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
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| 338 | && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
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| 339 | break;
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| 340 | if (*s == thousands)
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| 341 | end = s;
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| 342 | else
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| 343 | end = correctly_grouped_prefix (s, end, thousands, grouping);
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| 344 | }
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| 345 | else
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| 346 | #endif
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| 347 | end = NULL;
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| 348 |
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| 349 | cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
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| 350 | cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
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| 351 |
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| 352 | overflow = 0;
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| 353 | i = 0;
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| 354 | for (c = *s; c != L_('\0'); c = *++s)
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| 355 | {
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| 356 | if (s == end)
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| 357 | break;
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| 358 | if (c >= L_('0') && c <= L_('9'))
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| 359 | c -= L_('0');
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| 360 | else if (ISALPHA (c))
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| 361 | c = TOUPPER (c) - L_('A') + 10;
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| 362 | else
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| 363 | break;
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| 364 | if ((int) c >= base)
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| 365 | break;
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| 366 | /* Check for overflow. */
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| 367 | if (i > cutoff || (i == cutoff && c > cutlim))
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| 368 | overflow = 1;
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| 369 | else
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| 370 | {
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| 371 | i *= (unsigned LONG int) base;
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| 372 | i += c;
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| 373 | }
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| 374 | }
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| 375 |
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| 376 | /* Check if anything actually happened. */
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| 377 | if (s == save)
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| 378 | goto noconv;
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| 379 |
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| 380 | /* Store in ENDPTR the address of one character
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| 381 | past the last character we converted. */
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| 382 | if (endptr != NULL)
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| 383 | *endptr = (STRING_TYPE *) s;
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| 384 |
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| 385 | #if !UNSIGNED
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| 386 | /* Check for a value that is within the range of
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| 387 | `unsigned LONG int', but outside the range of `LONG int'. */
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| 388 | if (overflow == 0
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| 389 | && i > (negative
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| 390 | ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
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| 391 | : (unsigned LONG int) STRTOL_LONG_MAX))
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| 392 | overflow = 1;
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| 393 | #endif
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| 394 |
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| 395 | if (overflow)
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| 396 | {
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| 397 | __set_errno (ERANGE);
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| 398 | #if UNSIGNED
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| 399 | return STRTOL_ULONG_MAX;
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| 400 | #else
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| 401 | return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
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| 402 | #endif
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| 403 | }
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| 404 |
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| 405 | /* Return the result of the appropriate sign. */
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| 406 | return negative ? -i : i;
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| 407 |
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| 408 | noconv:
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| 409 | /* We must handle a special case here: the base is 0 or 16 and the
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| 410 | first two characters are '0' and 'x', but the rest are no
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| 411 | hexadecimal digits. This is no error case. We return 0 and
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| 412 | ENDPTR points to the `x`. */
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| 413 | if (endptr != NULL)
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| 414 | {
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| 415 | if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
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| 416 | && save[-2] == L_('0'))
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| 417 | *endptr = (STRING_TYPE *) &save[-1];
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| 418 | else
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| 419 | /* There was no number to convert. */
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| 420 | *endptr = (STRING_TYPE *) nptr;
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| 421 | }
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| 422 |
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| 423 | return 0L;
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| 424 | }
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| 425 | |
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| 426 |
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| 427 | /* External user entry point. */
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| 428 |
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| 429 |
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| 430 | INT
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| 431 | #ifdef weak_function
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| 432 | weak_function
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| 433 | #endif
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| 434 | strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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| 435 | int base LOCALE_PARAM_PROTO)
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| 436 | {
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| 437 | return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
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| 438 | }
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