1 /* Convert string representation of a number into an integer value.
3 Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003, 2005, 2006
4 Free Software Foundation, Inc.
6 NOTE: The canonical source of this file is maintained with the GNU C
7 Library. Bugs can be reported to bug-glibc@gnu.org.
9 This program is free software; you can redistribute it and/or modify it
10 under the terms of the GNU General Public License as published by the
11 Free Software Foundation; either version 2, or (at your option) any
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software Foundation,
21 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
24 # define USE_NUMBER_GROUPING
32 # define __set_errno(Val) errno = (Val)
40 #ifdef USE_NUMBER_GROUPING
41 # include "../locale/localeinfo.h"
44 /* Nonzero if we are defining `strtoul' or `strtoull', operating on
50 # define INT unsigned LONG int
53 /* Determine the name. */
54 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
58 # define strtol __wcstoull_l
60 # define strtol __wcstoul_l
64 # define strtol __strtoull_l
66 # define strtol __strtoul_l
72 # define strtol __wcstoll_l
74 # define strtol __wcstol_l
78 # define strtol __strtoll_l
80 # define strtol __strtol_l
88 # define strtol wcstoull
90 # define strtol wcstoul
94 # define strtol strtoull
96 # define strtol strtoul
100 # ifdef USE_WIDE_CHAR
102 # define strtol wcstoll
104 # define strtol wcstol
108 # define strtol strtoll
114 /* If QUAD is defined, we are defining `strtoll' or `strtoull',
115 operating on `long long int's. */
117 # define LONG long long
118 # define STRTOL_LONG_MIN LONG_LONG_MIN
119 # define STRTOL_LONG_MAX LONG_LONG_MAX
120 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
122 /* The extra casts in the following macros work around compiler bugs,
123 e.g., in Cray C 5.0.3.0. */
125 /* True if negative values of the signed integer type T use two's
126 complement, ones' complement, or signed magnitude representation,
127 respectively. Much GNU code assumes two's complement, but some
128 people like to be portable to all possible C hosts. */
129 # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
130 # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
131 # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
133 /* True if the arithmetic type T is signed. */
134 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
136 /* The maximum and minimum values for the integer type T. These
137 macros have undefined behavior if T is signed and has padding bits.
138 If this is a problem for you, please let us know how to fix it for
140 # define TYPE_MINIMUM(t) \
141 ((t) (! TYPE_SIGNED (t) \
143 : TYPE_SIGNED_MAGNITUDE (t) \
145 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
146 # define TYPE_MAXIMUM(t) \
147 ((t) (! TYPE_SIGNED (t) \
149 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
151 # ifndef ULONG_LONG_MAX
152 # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
154 # ifndef LONG_LONG_MAX
155 # define LONG_LONG_MAX TYPE_MAXIMUM (long long int)
157 # ifndef LONG_LONG_MIN
158 # define LONG_LONG_MIN TYPE_MINIMUM (long long int)
161 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
162 /* Work around gcc bug with using this constant. */
163 static const unsigned long long int maxquad = ULONG_LONG_MAX;
164 # undef STRTOL_ULONG_MAX
165 # define STRTOL_ULONG_MAX maxquad
169 # define STRTOL_LONG_MIN LONG_MIN
170 # define STRTOL_LONG_MAX LONG_MAX
171 # define STRTOL_ULONG_MAX ULONG_MAX
175 /* We use this code also for the extended locale handling where the
176 function gets as an additional argument the locale which has to be
177 used. To access the values we have to redefine the _NL_CURRENT
179 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
181 # define _NL_CURRENT(category, item) \
182 (current->values[_NL_ITEM_INDEX (item)].string)
183 # define LOCALE_PARAM , loc
184 # define LOCALE_PARAM_PROTO , __locale_t loc
186 # define LOCALE_PARAM
187 # define LOCALE_PARAM_PROTO
190 #if defined _LIBC || defined HAVE_WCHAR_H
196 # define L_(Ch) L##Ch
197 # define UCHAR_TYPE wint_t
198 # define STRING_TYPE wchar_t
199 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
200 # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
201 # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
202 # define TOUPPER(Ch) __towupper_l ((Ch), loc)
204 # define ISSPACE(Ch) iswspace (Ch)
205 # define ISALPHA(Ch) iswalpha (Ch)
206 # define TOUPPER(Ch) towupper (Ch)
210 # define UCHAR_TYPE unsigned char
211 # define STRING_TYPE char
212 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
213 # define ISSPACE(Ch) __isspace_l ((Ch), loc)
214 # define ISALPHA(Ch) __isalpha_l ((Ch), loc)
215 # define TOUPPER(Ch) __toupper_l ((Ch), loc)
217 # define ISSPACE(Ch) isspace (Ch)
218 # define ISALPHA(Ch) isalpha (Ch)
219 # define TOUPPER(Ch) toupper (Ch)
223 #define INTERNAL(X) INTERNAL1(X)
224 #define INTERNAL1(X) __##X##_internal
225 #define WEAKNAME(X) WEAKNAME1(X)
227 #ifdef USE_NUMBER_GROUPING
228 /* This file defines a function to check for correct grouping. */
229 # include "grouping.h"
234 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
235 If BASE is 0 the base is determined by the presence of a leading
236 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
237 If BASE is < 2 or > 36, it is reset to 10.
238 If ENDPTR is not NULL, a pointer to the character after the last
239 one converted is stored in *ENDPTR. */
242 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
243 int base, int group LOCALE_PARAM_PROTO)
246 register unsigned LONG int cutoff;
247 register unsigned int cutlim;
248 register unsigned LONG int i;
249 register const STRING_TYPE *s;
250 register UCHAR_TYPE c;
251 const STRING_TYPE *save, *end;
254 #ifdef USE_NUMBER_GROUPING
255 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
256 struct locale_data *current = loc->__locales[LC_NUMERIC];
258 /* The thousands character of the current locale. */
259 wchar_t thousands = L'\0';
260 /* The numeric grouping specification of the current locale,
261 in the format described in <locale.h>. */
262 const char *grouping;
266 grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
267 if (*grouping <= 0 || *grouping == CHAR_MAX)
271 /* Figure out the thousands separator character. */
272 # if defined _LIBC || defined _HAVE_BTOWC
273 thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
274 if (thousands == WEOF)
277 if (thousands == L'\0')
285 if (base < 0 || base == 1 || base > 36)
287 __set_errno (EINVAL);
293 /* Skip white space. */
299 /* Check for a sign. */
305 else if (*s == L_('+'))
313 /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
316 if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
327 /* Save the pointer so we can check later if anything happened. */
330 #ifdef USE_NUMBER_GROUPING
333 /* Find the end of the digit string and check its grouping. */
335 for (c = *end; c != L_('\0'); c = *++end)
336 if ((wchar_t) c != thousands
337 && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
338 && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
343 end = correctly_grouped_prefix (s, end, thousands, grouping);
349 cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
350 cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
354 for (c = *s; c != L_('\0'); c = *++s)
358 if (c >= L_('0') && c <= L_('9'))
360 else if (ISALPHA (c))
361 c = TOUPPER (c) - L_('A') + 10;
366 /* Check for overflow. */
367 if (i > cutoff || (i == cutoff && c > cutlim))
371 i *= (unsigned LONG int) base;
376 /* Check if anything actually happened. */
380 /* Store in ENDPTR the address of one character
381 past the last character we converted. */
383 *endptr = (STRING_TYPE *) s;
386 /* Check for a value that is within the range of
387 `unsigned LONG int', but outside the range of `LONG int'. */
390 ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
391 : (unsigned LONG int) STRTOL_LONG_MAX))
397 __set_errno (ERANGE);
399 return STRTOL_ULONG_MAX;
401 return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
405 /* Return the result of the appropriate sign. */
406 return negative ? -i : i;
409 /* We must handle a special case here: the base is 0 or 16 and the
410 first two characters are '0' and 'x', but the rest are no
411 hexadecimal digits. This is no error case. We return 0 and
412 ENDPTR points to the `x`. */
415 if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
416 && save[-2] == L_('0'))
417 *endptr = (STRING_TYPE *) &save[-1];
419 /* There was no number to convert. */
420 *endptr = (STRING_TYPE *) nptr;
426 /* External user entry point. */
433 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
434 int base LOCALE_PARAM_PROTO)
436 return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);