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Diffstat (limited to 'lib/strtol.c')
| -rw-r--r-- | lib/strtol.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/lib/strtol.c b/lib/strtol.c new file mode 100644 index 0000000..b93483d --- /dev/null +++ b/lib/strtol.c @@ -0,0 +1,416 @@ +/* Convert string representation of a number into an integer value. + + Copyright (C) 1991-1992, 1994-1999, 2003, 2005-2007, 2009-2023 Free Software + Foundation, Inc. + + NOTE: The canonical source of this file is maintained with the GNU C + Library. Bugs can be reported to bug-glibc@gnu.org. + + This file is free software: you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation, either version 3 of the + License, or (at your option) any later version. + + This file is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#ifdef _LIBC +# define USE_NUMBER_GROUPING +#else +# include <config.h> +#endif + +#include <ctype.h> +#include <errno.h> +#ifndef __set_errno +# define __set_errno(Val) errno = (Val) +#endif + +#include <limits.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> + +#ifdef USE_NUMBER_GROUPING +# include "../locale/localeinfo.h" +#endif + +/* Nonzero if we are defining 'strtoul' or 'strtoull', operating on + unsigned integers. */ +#ifndef UNSIGNED +# define UNSIGNED 0 +# define INT LONG int +#else +# define INT unsigned LONG int +#endif + +/* Determine the name. */ +#ifdef USE_IN_EXTENDED_LOCALE_MODEL +# undef strtol +# if UNSIGNED +# ifdef USE_WIDE_CHAR +# ifdef QUAD +# define strtol __wcstoull_l +# else +# define strtol __wcstoul_l +# endif +# else +# ifdef QUAD +# define strtol __strtoull_l +# else +# define strtol __strtoul_l +# endif +# endif +# else +# ifdef USE_WIDE_CHAR +# ifdef QUAD +# define strtol __wcstoll_l +# else +# define strtol __wcstol_l +# endif +# else +# ifdef QUAD +# define strtol __strtoll_l +# else +# define strtol __strtol_l +# endif +# endif +# endif +#else +# if UNSIGNED +# undef strtol +# ifdef USE_WIDE_CHAR +# ifdef QUAD +# define strtol wcstoull +# else +# define strtol wcstoul +# endif +# else +# ifdef QUAD +# define strtol strtoull +# else +# define strtol strtoul +# endif +# endif +# else +# ifdef USE_WIDE_CHAR +# undef strtol +# ifdef QUAD +# define strtol wcstoll +# else +# define strtol wcstol +# endif +# else +# ifdef QUAD +# undef strtol +# define strtol strtoll +# endif +# endif +# endif +#endif + +/* If QUAD is defined, we are defining 'strtoll' or 'strtoull', + operating on 'long long int's. */ +#ifdef QUAD +# define LONG long long +# define STRTOL_LONG_MIN LLONG_MIN +# define STRTOL_LONG_MAX LLONG_MAX +# define STRTOL_ULONG_MAX ULLONG_MAX +# if __GNUC__ == 2 && __GNUC_MINOR__ < 7 + /* Work around gcc bug with using this constant. */ + static const unsigned long long int maxquad = ULLONG_MAX; +# undef STRTOL_ULONG_MAX +# define STRTOL_ULONG_MAX maxquad +# endif +#else +# define LONG long +# define STRTOL_LONG_MIN LONG_MIN +# define STRTOL_LONG_MAX LONG_MAX +# define STRTOL_ULONG_MAX ULONG_MAX +#endif + + +#ifdef USE_NUMBER_GROUPING +# define GROUP_PARAM_PROTO , int group +#else +# define GROUP_PARAM_PROTO +#endif + +/* We use this code also for the extended locale handling where the + function gets as an additional argument the locale which has to be + used. To access the values we have to redefine the _NL_CURRENT + macro. */ +#ifdef USE_IN_EXTENDED_LOCALE_MODEL +# undef _NL_CURRENT +# define _NL_CURRENT(category, item) \ + (current->values[_NL_ITEM_INDEX (item)].string) +# define LOCALE_PARAM , loc +# define LOCALE_PARAM_PROTO , __locale_t loc +#else +# define LOCALE_PARAM +# define LOCALE_PARAM_PROTO +#endif + +#ifdef USE_WIDE_CHAR +# include <wchar.h> +# include <wctype.h> +# define L_(Ch) L##Ch +# define UCHAR_TYPE wint_t +# define STRING_TYPE wchar_t +# ifdef USE_IN_EXTENDED_LOCALE_MODEL +# define ISSPACE(Ch) __iswspace_l ((Ch), loc) +# define ISALPHA(Ch) __iswalpha_l ((Ch), loc) +# define TOUPPER(Ch) __towupper_l ((Ch), loc) +# else +# define ISSPACE(Ch) iswspace (Ch) +# define ISALPHA(Ch) iswalpha (Ch) +# define TOUPPER(Ch) towupper (Ch) +# endif +#else +# define L_(Ch) Ch +# define UCHAR_TYPE unsigned char +# define STRING_TYPE char +# ifdef USE_IN_EXTENDED_LOCALE_MODEL +# define ISSPACE(Ch) __isspace_l ((unsigned char) (Ch), loc) +# define ISALPHA(Ch) __isalpha_l ((unsigned char) (Ch), loc) +# define TOUPPER(Ch) __toupper_l ((unsigned char) (Ch), loc) +# else +# define ISSPACE(Ch) isspace ((unsigned char) (Ch)) +# define ISALPHA(Ch) isalpha ((unsigned char) (Ch)) +# define TOUPPER(Ch) toupper ((unsigned char) (Ch)) +# endif +#endif + +#ifdef USE_NUMBER_GROUPING +# define INTERNAL(X) INTERNAL1(X) +# define INTERNAL1(X) __##X##_internal +# define WEAKNAME(X) WEAKNAME1(X) +#else +# define INTERNAL(X) X +#endif + +#ifdef USE_NUMBER_GROUPING +/* This file defines a function to check for correct grouping. */ +# include "grouping.h" +#endif + + + +/* Convert NPTR to an 'unsigned long int' or 'long int' in base BASE. + If BASE is 0 the base is determined by the presence of a leading + zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal. + If BASE is < 2 or > 36, it is reset to 10. + If ENDPTR is not NULL, a pointer to the character after the last + one converted is stored in *ENDPTR. */ + +INT +INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr, + int base GROUP_PARAM_PROTO LOCALE_PARAM_PROTO) +{ + int negative; + register unsigned LONG int cutoff; + register unsigned int cutlim; + register unsigned LONG int i; + register const STRING_TYPE *s; + register UCHAR_TYPE c; + const STRING_TYPE *save, *end; + int overflow; + +#ifdef USE_NUMBER_GROUPING +# ifdef USE_IN_EXTENDED_LOCALE_MODEL + struct locale_data *current = loc->__locales[LC_NUMERIC]; +# endif + /* The thousands character of the current locale. */ + wchar_t thousands = L'\0'; + /* The numeric grouping specification of the current locale, + in the format described in <locale.h>. */ + const char *grouping; + + if (group) + { + grouping = _NL_CURRENT (LC_NUMERIC, GROUPING); + if (*grouping <= 0 || *grouping == CHAR_MAX) + grouping = NULL; + else + { + /* Figure out the thousands separator character. */ +# if defined _LIBC || defined _HAVE_BTOWC + thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP)); + if (thousands == WEOF) + thousands = L'\0'; +# endif + if (thousands == L'\0') + grouping = NULL; + } + } + else + grouping = NULL; +#endif + + if (base < 0 || base == 1 || base > 36) + { + __set_errno (EINVAL); + return 0; + } + + save = s = nptr; + + /* Skip white space. */ + while (ISSPACE (*s)) + ++s; + if (*s == L_('\0')) + goto noconv; + + /* Check for a sign. */ + if (*s == L_('-')) + { + negative = 1; + ++s; + } + else if (*s == L_('+')) + { + negative = 0; + ++s; + } + else + negative = 0; + + /* Recognize number prefix and if BASE is zero, figure it out ourselves. */ + if (*s == L_('0')) + { + if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X')) + { + s += 2; + base = 16; + } + else if ((base == 0 || base == 2) && TOUPPER (s[1]) == L_('B')) + { + s += 2; + base = 2; + } + else if (base == 0) + base = 8; + } + else if (base == 0) + base = 10; + + /* Save the pointer so we can check later if anything happened. */ + save = s; + +#ifdef USE_NUMBER_GROUPING + if (group) + { + /* Find the end of the digit string and check its grouping. */ + end = s; + for (c = *end; c != L_('\0'); c = *++end) + if ((wchar_t) c != thousands + && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9')) + && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base)) + break; + if (*s == thousands) + end = s; + else + end = correctly_grouped_prefix (s, end, thousands, grouping); + } + else +#endif + end = NULL; + + cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base; + cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base; + + overflow = 0; + i = 0; + for (c = *s; c != L_('\0'); c = *++s) + { + if (s == end) + break; + if (c >= L_('0') && c <= L_('9')) + c -= L_('0'); + else if (ISALPHA (c)) + c = TOUPPER (c) - L_('A') + 10; + else + break; + if ((int) c >= base) + break; + /* Check for overflow. */ + if (i > cutoff || (i == cutoff && c > cutlim)) + overflow = 1; + else + { + i *= (unsigned LONG int) base; + i += c; + } + } + + /* Check if anything actually happened. */ + if (s == save) + goto noconv; + + /* Store in ENDPTR the address of one character + past the last character we converted. */ + if (endptr != NULL) + *endptr = (STRING_TYPE *) s; + +#if !UNSIGNED + /* Check for a value that is within the range of + 'unsigned LONG int', but outside the range of 'LONG int'. */ + if (overflow == 0 + && i > (negative + ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1 + : (unsigned LONG int) STRTOL_LONG_MAX)) + overflow = 1; +#endif + + if (overflow) + { + __set_errno (ERANGE); +#if UNSIGNED + return STRTOL_ULONG_MAX; +#else + return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX; +#endif + } + + /* Return the result of the appropriate sign. */ + return negative ? -i : i; + +noconv: + /* We must handle a special case here: the base is 0 or 16 and the + first two characters are '0' and 'x', but the rest are no + hexadecimal digits. Likewise when the base is 0 or 2 and the + first two characters are '0' and 'b', but the rest are no binary + digits. This is no error case. We return 0 and ENDPTR points to + the 'x' or 'b'. */ + if (endptr != NULL) + { + if (save - nptr >= 2 + && (TOUPPER (save[-1]) == L_('X') || TOUPPER (save[-1]) == L_('B')) + && save[-2] == L_('0')) + *endptr = (STRING_TYPE *) &save[-1]; + else + /* There was no number to convert. */ + *endptr = (STRING_TYPE *) nptr; + } + + return 0L; +} + +#ifdef USE_NUMBER_GROUPING +/* External user entry point. */ + +INT +# ifdef weak_function +weak_function +# endif +strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr, + int base LOCALE_PARAM_PROTO) +{ + return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM); +} +#endif |