550 lines
13 KiB
C
550 lines
13 KiB
C
/* Convert string representing a number to integer value, using given locale.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef _LIBC
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# define USE_NUMBER_GROUPING
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# define HAVE_LIMITS_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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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#endif
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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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#include <locale.h>
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#include <stdint.h>
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#include <bits/wordsize.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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#if UNSIGNED
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# ifdef USE_WIDE_CHAR
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# ifdef QUAD
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# define strtol_l wcstoull_l
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# else
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# define strtol_l wcstoul_l
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# endif
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# else
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# ifdef QUAD
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# define strtol_l strtoull_l
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# else
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# define strtol_l 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_l wcstoll_l
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# else
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# define strtol_l wcstol_l
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# endif
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# else
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# ifdef QUAD
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# define strtol_l strtoll_l
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# else
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# define strtol_l strtol_l
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# endif
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# endif
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#endif
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#define __strtol_l __strtol_l2(strtol_l)
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#define __strtol_l2(name) __strtol_l3(name)
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#define __strtol_l3(name) __##name
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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 LONG_LONG_MIN
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# define STRTOL_LONG_MAX LONG_LONG_MAX
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# define STRTOL_ULONG_MAX ULONG_LONG_MAX
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#else
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# define LONG long
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# ifndef ULONG_MAX
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# define ULONG_MAX ((unsigned long int) ~(unsigned long int) 0)
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# endif
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# ifndef LONG_MAX
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# define LONG_MAX ((long int) (ULONG_MAX >> 1))
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# endif
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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 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 and
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_NL_CURRENT_WORD macros. */
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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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#undef _NL_CURRENT_WORD
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#define _NL_CURRENT_WORD(category, item) \
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((uint32_t) current->values[_NL_ITEM_INDEX (item)].word)
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#if defined _LIBC || defined HAVE_WCHAR_H
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# include <wchar.h>
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#endif
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#ifdef USE_WIDE_CHAR
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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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# define ISSPACE(Ch) __iswspace_l ((Ch), loc)
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# define ISALPHA(Ch) __iswalpha_l ((Ch), _nl_C_locobj_ptr)
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# define TOUPPER(Ch) __towupper_l ((Ch), _nl_C_locobj_ptr)
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#else
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# if defined _LIBC \
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|| defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
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# define IN_CTYPE_DOMAIN(c) 1
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# else
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# define IN_CTYPE_DOMAIN(c) isascii(c)
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# endif
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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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# define ISSPACE(Ch) __isspace_l ((Ch), loc)
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# define ISALPHA(Ch) __isalpha_l ((Ch), _nl_C_locobj_ptr)
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# define TOUPPER(Ch) __toupper_l ((Ch), _nl_C_locobj_ptr)
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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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/* Define tables of maximum values and remainders in order to detect
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overflow. Do this at compile-time in order to avoid the runtime
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overhead of the division. */
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extern const unsigned long __strtol_ul_max_tab[] attribute_hidden;
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extern const unsigned char __strtol_ul_rem_tab[] attribute_hidden;
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#if defined(QUAD) && __WORDSIZE == 32
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extern const unsigned long long __strtol_ull_max_tab[] attribute_hidden;
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extern const unsigned char __strtol_ull_rem_tab[] attribute_hidden;
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#endif
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#define DEF(TYPE, NAME) \
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const TYPE NAME[] attribute_hidden = \
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{ \
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F(2), F(3), F(4), F(5), F(6), F(7), F(8), F(9), F(10), \
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F(11), F(12), F(13), F(14), F(15), F(16), F(17), F(18), F(19), F(20), \
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F(21), F(22), F(23), F(24), F(25), F(26), F(27), F(28), F(29), F(30), \
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F(31), F(32), F(33), F(34), F(35), F(36) \
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}
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#if !UNSIGNED && !defined (USE_WIDE_CHAR) && !defined (QUAD)
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# define F(X) ULONG_MAX / X
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DEF (unsigned long, __strtol_ul_max_tab);
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# undef F
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# define F(X) ULONG_MAX % X
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DEF (unsigned char, __strtol_ul_rem_tab);
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# undef F
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#endif
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#if !UNSIGNED && !defined (USE_WIDE_CHAR) && defined (QUAD) \
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&& __WORDSIZE == 32
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# define F(X) ULONG_LONG_MAX / X
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DEF (unsigned long long, __strtol_ull_max_tab);
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# undef F
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# define F(X) ULONG_LONG_MAX % X
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DEF (unsigned char, __strtol_ull_rem_tab);
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# undef F
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#endif
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#undef DEF
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/* Define some more readable aliases for these arrays which correspond
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to how they'll be used in the function below. */
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#define jmax_tab __strtol_ul_max_tab
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#if defined(QUAD) && __WORDSIZE == 32
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# define cutoff_tab __strtol_ull_max_tab
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# define cutlim_tab __strtol_ull_rem_tab
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#else
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# define cutoff_tab __strtol_ul_max_tab
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# define cutlim_tab __strtol_ul_rem_tab
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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_l) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
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int base, int group, locale_t loc)
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{
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int negative;
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unsigned LONG int cutoff;
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unsigned int cutlim;
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unsigned LONG int i;
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const STRING_TYPE *s;
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UCHAR_TYPE c;
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const STRING_TYPE *save, *end;
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int overflow;
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#ifndef USE_WIDE_CHAR
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size_t cnt;
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#endif
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#ifdef USE_NUMBER_GROUPING
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struct __locale_data *current = loc->__locales[LC_NUMERIC];
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/* The thousands character of the current locale. */
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# ifdef USE_WIDE_CHAR
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wchar_t thousands = L'\0';
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# else
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const char *thousands = NULL;
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size_t thousands_len = 0;
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# endif
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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 (__glibc_unlikely (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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# ifdef USE_WIDE_CHAR
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# ifdef _LIBC
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thousands = _NL_CURRENT_WORD (LC_NUMERIC,
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_NL_NUMERIC_THOUSANDS_SEP_WC);
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# endif
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if (thousands == L'\0')
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grouping = NULL;
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# else
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# ifdef _LIBC
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thousands = _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
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# endif
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if (*thousands == '\0')
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{
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thousands = NULL;
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grouping = NULL;
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}
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# endif
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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 (__glibc_unlikely (*s == L_('\0')))
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goto noconv;
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/* Check for a sign. */
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negative = 0;
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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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++s;
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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 (base != 10)
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grouping = NULL;
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if (__glibc_unlikely (grouping != NULL))
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{
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# ifndef USE_WIDE_CHAR
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thousands_len = strlen (thousands);
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# endif
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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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if (
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# ifdef USE_WIDE_CHAR
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*s != thousands
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# else
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({ for (cnt = 0; cnt < thousands_len; ++cnt)
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if (thousands[cnt] != end[cnt])
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break;
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cnt < thousands_len; })
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# endif
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)
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{
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for (c = *end; c != L_('\0'); c = *++end)
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if (((STRING_TYPE) c < L_('0') || (STRING_TYPE) c > L_('9'))
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# ifdef USE_WIDE_CHAR
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&& (wchar_t) c != thousands
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# else
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&& ({ for (cnt = 0; cnt < thousands_len; ++cnt)
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if (thousands[cnt] != end[cnt])
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break;
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cnt < thousands_len; })
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# endif
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&& (!ISALPHA (c)
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|| (int) (TOUPPER (c) - L_('A') + 10) >= base))
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break;
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# ifdef USE_WIDE_CHAR
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end = __correctly_grouped_prefixwc (s, end, thousands, grouping);
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# else
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end = __correctly_grouped_prefixmb (s, end, thousands, grouping);
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# endif
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}
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}
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else
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#endif
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end = NULL;
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/* Avoid runtime division; lookup cutoff and limit. */
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cutoff = cutoff_tab[base - 2];
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cutlim = cutlim_tab[base - 2];
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overflow = 0;
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i = 0;
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c = *s;
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if (sizeof (long int) != sizeof (LONG int))
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{
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unsigned long int j = 0;
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unsigned long int jmax = jmax_tab[base - 2];
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for (;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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#ifdef USE_NUMBER_GROUPING
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# ifdef USE_WIDE_CHAR
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else if (grouping && (wchar_t) c == thousands)
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continue;
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# else
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else if (thousands_len)
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{
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for (cnt = 0; cnt < thousands_len; ++cnt)
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if (thousands[cnt] != s[cnt])
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break;
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if (cnt == thousands_len)
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{
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s += thousands_len - 1;
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continue;
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}
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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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}
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# endif
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#endif
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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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/* Note that we never can have an overflow. */
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else if (j >= jmax)
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{
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/* We have an overflow. Now use the long representation. */
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i = (unsigned LONG int) j;
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goto use_long;
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}
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else
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j = j * (unsigned long int) base + c;
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}
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i = (unsigned LONG int) j;
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}
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else
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for (;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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#ifdef USE_NUMBER_GROUPING
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# ifdef USE_WIDE_CHAR
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else if (grouping && (wchar_t) c == thousands)
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continue;
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# else
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else if (thousands_len)
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{
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for (cnt = 0; cnt < thousands_len; ++cnt)
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if (thousands[cnt] != s[cnt])
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break;
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if (cnt == thousands_len)
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{
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s += thousands_len - 1;
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continue;
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}
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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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}
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# endif
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#endif
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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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use_long:
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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 (__glibc_unlikely (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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#if defined _LIBC && !defined USE_WIDE_CHAR
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libc_hidden_def (INTERNAL (__strtol_l))
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#endif
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/* External user entry point. */
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#if _LIBC - 0 == 0
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/* Prototype. */
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||
extern INT __strtol_l (const STRING_TYPE *nptr, STRING_TYPE **endptr,
|
||
int base);
|
||
#endif
|
||
|
||
|
||
INT
|
||
#ifdef weak_function
|
||
weak_function
|
||
#endif
|
||
__strtol_l (const STRING_TYPE *nptr, STRING_TYPE **endptr,
|
||
int base, locale_t loc)
|
||
{
|
||
return INTERNAL (__strtol_l) (nptr, endptr, base, 0, loc);
|
||
}
|
||
libc_hidden_def (__strtol_l)
|
||
weak_alias (__strtol_l, strtol_l)
|