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434 lines
11 KiB
C
434 lines
11 KiB
C
/* Convert string representation of a number into an integer value.
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Copyright (C) 1991-1992, 1994-1999, 2003, 2005-2007, 2009-2013 Free Software
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Foundation, Inc.
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NOTE: The canonical source of this file is maintained with the GNU C
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Library. Bugs can be reported to bug-glibc@gnu.org.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifdef _LIBC
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# define USE_NUMBER_GROUPING
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#else
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# include <config.h>
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#endif
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#include <ctype.h>
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#include <errno.h>
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#ifndef __set_errno
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# define __set_errno(Val) errno = (Val)
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#endif
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#include <limits.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef USE_NUMBER_GROUPING
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# include "../locale/localeinfo.h"
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#endif
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/* Nonzero if we are defining 'strtoul' or 'strtoull', operating on
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unsigned integers. */
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#ifndef UNSIGNED
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# define UNSIGNED 0
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# define INT LONG int
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#else
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# define INT unsigned LONG int
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#endif
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/* Determine the name. */
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#ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# if UNSIGNED
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# ifdef USE_WIDE_CHAR
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# ifdef QUAD
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# define strtol __wcstoull_l
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# else
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# define strtol __wcstoul_l
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# endif
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# else
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# ifdef QUAD
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# define strtol __strtoull_l
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# else
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# define strtol __strtoul_l
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# endif
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# endif
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# else
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# ifdef USE_WIDE_CHAR
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# ifdef QUAD
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# define strtol __wcstoll_l
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# else
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# define strtol __wcstol_l
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# endif
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# else
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# ifdef QUAD
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# define strtol __strtoll_l
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# else
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# define strtol __strtol_l
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# endif
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# endif
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# endif
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#else
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# if UNSIGNED
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# ifdef USE_WIDE_CHAR
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# ifdef QUAD
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# define strtol wcstoull
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# else
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# define strtol wcstoul
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# endif
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# else
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# ifdef QUAD
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# define strtol strtoull
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# else
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# define strtol strtoul
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# endif
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# endif
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# else
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# ifdef USE_WIDE_CHAR
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# ifdef QUAD
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# define strtol wcstoll
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# else
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# define strtol wcstol
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# endif
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# else
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# ifdef QUAD
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# define strtol strtoll
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# endif
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# endif
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# endif
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#endif
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/* If QUAD is defined, we are defining 'strtoll' or 'strtoull',
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operating on 'long long int's. */
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#ifdef QUAD
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# define LONG long long
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# define STRTOL_LONG_MIN LLONG_MIN
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# define STRTOL_LONG_MAX LLONG_MAX
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# define STRTOL_ULONG_MAX ULLONG_MAX
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/* The extra casts in the following macros work around compiler bugs,
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e.g., in Cray C 5.0.3.0. */
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/* True if negative values of the signed integer type T use two's
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complement, ones' complement, or signed magnitude representation,
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respectively. Much GNU code assumes two's complement, but some
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people like to be portable to all possible C hosts. */
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# define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
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# define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
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# define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
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/* True if the arithmetic type T is signed. */
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# define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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/* The maximum and minimum values for the integer type T. These
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macros have undefined behavior if T is signed and has padding bits.
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If this is a problem for you, please let us know how to fix it for
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your host. */
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# define TYPE_MINIMUM(t) \
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((t) (! TYPE_SIGNED (t) \
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? (t) 0 \
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: TYPE_SIGNED_MAGNITUDE (t) \
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? ~ (t) 0 \
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: ~ TYPE_MAXIMUM (t)))
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# define TYPE_MAXIMUM(t) \
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((t) (! TYPE_SIGNED (t) \
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? (t) -1 \
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: ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
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# ifndef ULLONG_MAX
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# define ULLONG_MAX TYPE_MAXIMUM (unsigned long long)
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# endif
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# ifndef LLONG_MAX
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# define LLONG_MAX TYPE_MAXIMUM (long long int)
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# endif
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# ifndef LLONG_MIN
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# define LLONG_MIN TYPE_MINIMUM (long long int)
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# endif
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# if __GNUC__ == 2 && __GNUC_MINOR__ < 7
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/* Work around gcc bug with using this constant. */
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static const unsigned long long int maxquad = ULLONG_MAX;
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# undef STRTOL_ULONG_MAX
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# define STRTOL_ULONG_MAX maxquad
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# endif
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#else
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# define LONG long
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# define STRTOL_LONG_MIN LONG_MIN
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# define STRTOL_LONG_MAX LONG_MAX
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# define STRTOL_ULONG_MAX ULONG_MAX
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#endif
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/* We use this code also for the extended locale handling where the
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function gets as an additional argument the locale which has to be
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used. To access the values we have to redefine the _NL_CURRENT
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macro. */
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#ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# undef _NL_CURRENT
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# define _NL_CURRENT(category, item) \
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(current->values[_NL_ITEM_INDEX (item)].string)
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# define LOCALE_PARAM , loc
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# define LOCALE_PARAM_PROTO , __locale_t loc
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#else
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# define LOCALE_PARAM
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# define LOCALE_PARAM_PROTO
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#endif
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#ifdef USE_WIDE_CHAR
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# include <wchar.h>
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# include <wctype.h>
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# define L_(Ch) L##Ch
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# define UCHAR_TYPE wint_t
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# define STRING_TYPE wchar_t
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# ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# define ISSPACE(Ch) __iswspace_l ((Ch), loc)
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# define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
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# define TOUPPER(Ch) __towupper_l ((Ch), loc)
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# else
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# define ISSPACE(Ch) iswspace (Ch)
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# define ISALPHA(Ch) iswalpha (Ch)
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# define TOUPPER(Ch) towupper (Ch)
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# endif
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#else
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# define L_(Ch) Ch
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# define UCHAR_TYPE unsigned char
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# define STRING_TYPE char
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# ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# define ISSPACE(Ch) __isspace_l ((Ch), loc)
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# define ISALPHA(Ch) __isalpha_l ((Ch), loc)
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# define TOUPPER(Ch) __toupper_l ((Ch), loc)
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# else
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# define ISSPACE(Ch) isspace (Ch)
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# define ISALPHA(Ch) isalpha (Ch)
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# define TOUPPER(Ch) toupper (Ch)
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# endif
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#endif
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#define INTERNAL(X) INTERNAL1(X)
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#define INTERNAL1(X) __##X##_internal
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#define WEAKNAME(X) WEAKNAME1(X)
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#ifdef USE_NUMBER_GROUPING
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/* This file defines a function to check for correct grouping. */
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# include "grouping.h"
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#endif
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/* Convert NPTR to an 'unsigned long int' or 'long int' in base BASE.
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If BASE is 0 the base is determined by the presence of a leading
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zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
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If BASE is < 2 or > 36, it is reset to 10.
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If ENDPTR is not NULL, a pointer to the character after the last
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one converted is stored in *ENDPTR. */
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INT
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INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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int base, int group LOCALE_PARAM_PROTO)
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{
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int negative;
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register unsigned LONG int cutoff;
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register unsigned int cutlim;
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register unsigned LONG int i;
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register const STRING_TYPE *s;
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register UCHAR_TYPE c;
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const STRING_TYPE *save, *end;
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int overflow;
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#ifdef USE_NUMBER_GROUPING
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# ifdef USE_IN_EXTENDED_LOCALE_MODEL
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struct locale_data *current = loc->__locales[LC_NUMERIC];
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# endif
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/* The thousands character of the current locale. */
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wchar_t thousands = L'\0';
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/* The numeric grouping specification of the current locale,
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in the format described in <locale.h>. */
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const char *grouping;
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if (group)
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{
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grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
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if (*grouping <= 0 || *grouping == CHAR_MAX)
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grouping = NULL;
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else
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{
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/* Figure out the thousands separator character. */
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# if defined _LIBC || defined _HAVE_BTOWC
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thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
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if (thousands == WEOF)
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thousands = L'\0';
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# endif
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if (thousands == L'\0')
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grouping = NULL;
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}
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}
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else
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grouping = NULL;
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#endif
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if (base < 0 || base == 1 || base > 36)
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{
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__set_errno (EINVAL);
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return 0;
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}
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save = s = nptr;
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/* Skip white space. */
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while (ISSPACE (*s))
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++s;
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if (*s == L_('\0'))
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goto noconv;
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/* Check for a sign. */
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if (*s == L_('-'))
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{
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negative = 1;
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++s;
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}
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else if (*s == L_('+'))
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{
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negative = 0;
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++s;
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}
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else
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negative = 0;
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/* Recognize number prefix and if BASE is zero, figure it out ourselves. */
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if (*s == L_('0'))
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{
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if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
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{
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s += 2;
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base = 16;
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}
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else if (base == 0)
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base = 8;
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}
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else if (base == 0)
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base = 10;
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/* Save the pointer so we can check later if anything happened. */
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save = s;
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#ifdef USE_NUMBER_GROUPING
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if (group)
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{
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/* Find the end of the digit string and check its grouping. */
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end = s;
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for (c = *end; c != L_('\0'); c = *++end)
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if ((wchar_t) c != thousands
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&& ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
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&& (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
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break;
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if (*s == thousands)
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end = s;
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else
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end = correctly_grouped_prefix (s, end, thousands, grouping);
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}
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else
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#endif
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end = NULL;
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cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
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cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
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overflow = 0;
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i = 0;
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for (c = *s; c != L_('\0'); c = *++s)
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{
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if (s == end)
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break;
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if (c >= L_('0') && c <= L_('9'))
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c -= L_('0');
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else if (ISALPHA (c))
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c = TOUPPER (c) - L_('A') + 10;
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else
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break;
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if ((int) c >= base)
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break;
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/* Check for overflow. */
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if (i > cutoff || (i == cutoff && c > cutlim))
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overflow = 1;
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else
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{
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i *= (unsigned LONG int) base;
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i += c;
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}
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}
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/* Check if anything actually happened. */
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if (s == save)
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goto noconv;
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/* Store in ENDPTR the address of one character
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past the last character we converted. */
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if (endptr != NULL)
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*endptr = (STRING_TYPE *) s;
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#if !UNSIGNED
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/* Check for a value that is within the range of
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'unsigned LONG int', but outside the range of 'LONG int'. */
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if (overflow == 0
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&& i > (negative
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? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
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: (unsigned LONG int) STRTOL_LONG_MAX))
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overflow = 1;
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#endif
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if (overflow)
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{
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__set_errno (ERANGE);
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#if UNSIGNED
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return STRTOL_ULONG_MAX;
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#else
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return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
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#endif
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}
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/* Return the result of the appropriate sign. */
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return negative ? -i : i;
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noconv:
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/* We must handle a special case here: the base is 0 or 16 and the
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first two characters are '0' and 'x', but the rest are no
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hexadecimal digits. This is no error case. We return 0 and
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ENDPTR points to the 'x'. */
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if (endptr != NULL)
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{
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if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
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&& save[-2] == L_('0'))
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*endptr = (STRING_TYPE *) &save[-1];
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else
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/* There was no number to convert. */
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*endptr = (STRING_TYPE *) nptr;
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}
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return 0L;
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}
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/* External user entry point. */
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INT
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#ifdef weak_function
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weak_function
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#endif
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strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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int base LOCALE_PARAM_PROTO)
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{
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return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
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}
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