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. */
28 # define USE_NUMBER_GROUPING
34 # define __set_errno(Val) errno = (Val)
42 #ifdef USE_NUMBER_GROUPING
43 # include "../locale/localeinfo.h"
46 /* Nonzero if we are defining `strtoul' or `strtoull', operating on
52 # define INT unsigned LONG int
55 /* Determine the name. */
56 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
60 # define strtol __wcstoull_l
62 # define strtol __wcstoul_l
66 # define strtol __strtoull_l
68 # define strtol __strtoul_l
74 # define strtol __wcstoll_l
76 # define strtol __wcstol_l
80 # define strtol __strtoll_l
82 # define strtol __strtol_l
90 # define strtol wcstoull
92 # define strtol wcstoul
96 # define strtol strtoull
98 # define strtol strtoul
102 # ifdef USE_WIDE_CHAR
104 # define strtol wcstoll
106 # define strtol wcstol
110 # define strtol strtoll
116 /* If QUAD is defined, we are defining `strtoll' or `strtoull',
117 operating on `long long int's. */
119 # define LONG long long
120 # define STRTOL_LONG_MIN LONG_LONG_MIN
121 # define STRTOL_LONG_MAX LONG_LONG_MAX
122 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
124 /* The extra casts in the following macros work around compiler bugs,
125 e.g., in Cray C 5.0.3.0. */
127 /* True if negative values of the signed integer type T use two's
128 complement, ones' complement, or signed magnitude representation,
129 respectively. Much GNU code assumes two's complement, but some
130 people like to be portable to all possible C hosts. */
131 # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
132 # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
133 # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
135 /* True if the arithmetic type T is signed. */
136 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
138 /* The maximum and minimum values for the integer type T. These
139 macros have undefined behavior if T is signed and has padding bits.
140 If this is a problem for you, please let us know how to fix it for
142 # define TYPE_MINIMUM(t) \
143 ((t) (! TYPE_SIGNED (t) \
145 : TYPE_SIGNED_MAGNITUDE (t) \
147 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))
148 # define TYPE_MAXIMUM(t) \
149 ((t) (! TYPE_SIGNED (t) \
151 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
153 # ifndef ULONG_LONG_MAX
154 # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
156 # ifndef LONG_LONG_MAX
157 # define LONG_LONG_MAX TYPE_MAXIMUM (long long int)
159 # ifndef LONG_LONG_MIN
160 # define LONG_LONG_MIN TYPE_MINIMUM (long long int)
163 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
164 /* Work around gcc bug with using this constant. */
165 static const unsigned long long int maxquad = ULONG_LONG_MAX;
166 # undef STRTOL_ULONG_MAX
167 # define STRTOL_ULONG_MAX maxquad
171 # define STRTOL_LONG_MIN LONG_MIN
172 # define STRTOL_LONG_MAX LONG_MAX
173 # define STRTOL_ULONG_MAX ULONG_MAX
177 /* We use this code also for the extended locale handling where the
178 function gets as an additional argument the locale which has to be
179 used. To access the values we have to redefine the _NL_CURRENT
181 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
183 # define _NL_CURRENT(category, item) \
184 (current->values[_NL_ITEM_INDEX (item)].string)
185 # define LOCALE_PARAM , loc
186 # define LOCALE_PARAM_PROTO , __locale_t loc
188 # define LOCALE_PARAM
189 # define LOCALE_PARAM_PROTO
192 #if defined _LIBC || defined HAVE_WCHAR_H
198 # define L_(Ch) L##Ch
199 # define UCHAR_TYPE wint_t
200 # define STRING_TYPE wchar_t
201 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
202 # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
203 # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
204 # define TOUPPER(Ch) __towupper_l ((Ch), loc)
206 # define ISSPACE(Ch) iswspace (Ch)
207 # define ISALPHA(Ch) iswalpha (Ch)
208 # define TOUPPER(Ch) towupper (Ch)
212 # define UCHAR_TYPE unsigned char
213 # define STRING_TYPE char
214 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
215 # define ISSPACE(Ch) __isspace_l ((Ch), loc)
216 # define ISALPHA(Ch) __isalpha_l ((Ch), loc)
217 # define TOUPPER(Ch) __toupper_l ((Ch), loc)
219 # define ISSPACE(Ch) isspace (Ch)
220 # define ISALPHA(Ch) isalpha (Ch)
221 # define TOUPPER(Ch) toupper (Ch)
225 #define INTERNAL(X) INTERNAL1(X)
226 #define INTERNAL1(X) __##X##_internal
227 #define WEAKNAME(X) WEAKNAME1(X)
229 #ifdef USE_NUMBER_GROUPING
230 /* This file defines a function to check for correct grouping. */
231 # include "grouping.h"
236 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
237 If BASE is 0 the base is determined by the presence of a leading
238 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
239 If BASE is < 2 or > 36, it is reset to 10.
240 If ENDPTR is not NULL, a pointer to the character after the last
241 one converted is stored in *ENDPTR. */
244 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
245 int base, int group LOCALE_PARAM_PROTO)
248 register unsigned LONG int cutoff;
249 register unsigned int cutlim;
250 register unsigned LONG int i;
251 register const STRING_TYPE *s;
252 register UCHAR_TYPE c;
253 const STRING_TYPE *save, *end;
256 #ifdef USE_NUMBER_GROUPING
257 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
258 struct locale_data *current = loc->__locales[LC_NUMERIC];
260 /* The thousands character of the current locale. */
261 wchar_t thousands = L'\0';
262 /* The numeric grouping specification of the current locale,
263 in the format described in <locale.h>. */
264 const char *grouping;
268 grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
269 if (*grouping <= 0 || *grouping == CHAR_MAX)
273 /* Figure out the thousands separator character. */
274 # if defined _LIBC || defined _HAVE_BTOWC
275 thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
276 if (thousands == WEOF)
279 if (thousands == L'\0')
287 if (base < 0 || base == 1 || base > 36)
289 __set_errno (EINVAL);
295 /* Skip white space. */
301 /* Check for a sign. */
307 else if (*s == L_('+'))
315 /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
318 if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
329 /* Save the pointer so we can check later if anything happened. */
332 #ifdef USE_NUMBER_GROUPING
335 /* Find the end of the digit string and check its grouping. */
337 for (c = *end; c != L_('\0'); c = *++end)
338 if ((wchar_t) c != thousands
339 && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
340 && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
345 end = correctly_grouped_prefix (s, end, thousands, grouping);
351 cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
352 cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
356 for (c = *s; c != L_('\0'); c = *++s)
360 if (c >= L_('0') && c <= L_('9'))
362 else if (ISALPHA (c))
363 c = TOUPPER (c) - L_('A') + 10;
368 /* Check for overflow. */
369 if (i > cutoff || (i == cutoff && c > cutlim))
373 i *= (unsigned LONG int) base;
378 /* Check if anything actually happened. */
382 /* Store in ENDPTR the address of one character
383 past the last character we converted. */
385 *endptr = (STRING_TYPE *) s;
388 /* Check for a value that is within the range of
389 `unsigned LONG int', but outside the range of `LONG int'. */
392 ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
393 : (unsigned LONG int) STRTOL_LONG_MAX))
399 __set_errno (ERANGE);
401 return STRTOL_ULONG_MAX;
403 return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
407 /* Return the result of the appropriate sign. */
408 return negative ? -i : i;
411 /* We must handle a special case here: the base is 0 or 16 and the
412 first two characters are '0' and 'x', but the rest are no
413 hexadecimal digits. This is no error case. We return 0 and
414 ENDPTR points to the `x`. */
417 if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
418 && save[-2] == L_('0'))
419 *endptr = (STRING_TYPE *) &save[-1];
421 /* There was no number to convert. */
422 *endptr = (STRING_TYPE *) nptr;
428 /* External user entry point. */
435 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
436 int base LOCALE_PARAM_PROTO)
438 return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);