1 /* Convert string representation of a number into an integer value.
3 Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003, 2005
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 # define USE_NUMBER_GROUPING
37 # define __set_errno(Val) errno = (Val)
45 #ifdef USE_NUMBER_GROUPING
46 # include "../locale/localeinfo.h"
49 /* Nonzero if we are defining `strtoul' or `strtoull', operating on
55 # define INT unsigned LONG int
58 /* Determine the name. */
59 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
63 # define strtol __wcstoull_l
65 # define strtol __wcstoul_l
69 # define strtol __strtoull_l
71 # define strtol __strtoul_l
77 # define strtol __wcstoll_l
79 # define strtol __wcstol_l
83 # define strtol __strtoll_l
85 # define strtol __strtol_l
93 # define strtol wcstoull
95 # define strtol wcstoul
99 # define strtol strtoull
101 # define strtol strtoul
105 # ifdef USE_WIDE_CHAR
107 # define strtol wcstoll
109 # define strtol wcstol
113 # define strtol strtoll
119 /* If QUAD is defined, we are defining `strtoll' or `strtoull',
120 operating on `long long int's. */
122 # define LONG long long
123 # define STRTOL_LONG_MIN LONG_LONG_MIN
124 # define STRTOL_LONG_MAX LONG_LONG_MAX
125 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
127 /* The extra casts in the following macros work around compiler bugs,
128 e.g., in Cray C 5.0.3.0. */
130 /* True if the arithmetic type T is signed. */
132 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
135 /* The maximum and minimum values for the integer type T. These
136 macros have undefined behavior if T is signed and has padding bits
137 (i.e., bits that do not contribute to the value), or if T uses
138 signed-magnitude representation. If this is a problem for you,
139 please let us know how to fix it for your host. */
140 # ifndef TYPE_MINIMUM
141 # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
142 ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
145 # ifndef TYPE_MAXIMUM
146 # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
149 # ifndef ULONG_LONG_MAX
150 # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
152 # ifndef LONG_LONG_MAX
153 # define LONG_LONG_MAX TYPE_MAXIMUM (long long int)
155 # ifndef LONG_LONG_MIN
156 # define LONG_LONG_MIN TYPE_MINIMUM (long long int)
159 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
160 /* Work around gcc bug with using this constant. */
161 static const unsigned long long int maxquad = ULONG_LONG_MAX;
162 # undef STRTOL_ULONG_MAX
163 # define STRTOL_ULONG_MAX maxquad
167 # define STRTOL_LONG_MIN LONG_MIN
168 # define STRTOL_LONG_MAX LONG_MAX
169 # define STRTOL_ULONG_MAX ULONG_MAX
173 /* We use this code also for the extended locale handling where the
174 function gets as an additional argument the locale which has to be
175 used. To access the values we have to redefine the _NL_CURRENT
177 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
179 # define _NL_CURRENT(category, item) \
180 (current->values[_NL_ITEM_INDEX (item)].string)
181 # define LOCALE_PARAM , loc
182 # define LOCALE_PARAM_PROTO , __locale_t loc
184 # define LOCALE_PARAM
185 # define LOCALE_PARAM_PROTO
188 #if defined _LIBC || defined HAVE_WCHAR_H
194 # define L_(Ch) L##Ch
195 # define UCHAR_TYPE wint_t
196 # define STRING_TYPE wchar_t
197 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
198 # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
199 # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
200 # define TOUPPER(Ch) __towupper_l ((Ch), loc)
202 # define ISSPACE(Ch) iswspace (Ch)
203 # define ISALPHA(Ch) iswalpha (Ch)
204 # define TOUPPER(Ch) towupper (Ch)
207 # if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
208 # define IN_CTYPE_DOMAIN(c) 1
210 # define IN_CTYPE_DOMAIN(c) isascii(c)
213 # define UCHAR_TYPE unsigned char
214 # define STRING_TYPE char
215 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
216 # define ISSPACE(Ch) __isspace_l ((Ch), loc)
217 # define ISALPHA(Ch) __isalpha_l ((Ch), loc)
218 # define TOUPPER(Ch) __toupper_l ((Ch), loc)
220 # define ISSPACE(Ch) (IN_CTYPE_DOMAIN (Ch) && isspace (Ch))
221 # define ISALPHA(Ch) (IN_CTYPE_DOMAIN (Ch) && isalpha (Ch))
222 # define TOUPPER(Ch) (IN_CTYPE_DOMAIN (Ch) ? toupper (Ch) : (Ch))
226 #define INTERNAL(X) INTERNAL1(X)
227 #define INTERNAL1(X) __##X##_internal
228 #define WEAKNAME(X) WEAKNAME1(X)
230 #ifdef USE_NUMBER_GROUPING
231 /* This file defines a function to check for correct grouping. */
232 # include "grouping.h"
237 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
238 If BASE is 0 the base is determined by the presence of a leading
239 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
240 If BASE is < 2 or > 36, it is reset to 10.
241 If ENDPTR is not NULL, a pointer to the character after the last
242 one converted is stored in *ENDPTR. */
245 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
246 int base, int group LOCALE_PARAM_PROTO)
249 register unsigned LONG int cutoff;
250 register unsigned int cutlim;
251 register unsigned LONG int i;
252 register const STRING_TYPE *s;
253 register UCHAR_TYPE c;
254 const STRING_TYPE *save, *end;
257 #ifdef USE_NUMBER_GROUPING
258 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
259 struct locale_data *current = loc->__locales[LC_NUMERIC];
261 /* The thousands character of the current locale. */
262 wchar_t thousands = L'\0';
263 /* The numeric grouping specification of the current locale,
264 in the format described in <locale.h>. */
265 const char *grouping;
269 grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
270 if (*grouping <= 0 || *grouping == CHAR_MAX)
274 /* Figure out the thousands separator character. */
275 # if defined _LIBC || defined _HAVE_BTOWC
276 thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
277 if (thousands == WEOF)
280 if (thousands == L'\0')
288 if (base < 0 || base == 1 || base > 36)
290 __set_errno (EINVAL);
296 /* Skip white space. */
302 /* Check for a sign. */
308 else if (*s == L_('+'))
316 /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
319 if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
330 /* Save the pointer so we can check later if anything happened. */
333 #ifdef USE_NUMBER_GROUPING
336 /* Find the end of the digit string and check its grouping. */
338 for (c = *end; c != L_('\0'); c = *++end)
339 if ((wchar_t) c != thousands
340 && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
341 && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
346 end = correctly_grouped_prefix (s, end, thousands, grouping);
352 cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
353 cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
357 for (c = *s; c != L_('\0'); c = *++s)
361 if (c >= L_('0') && c <= L_('9'))
363 else if (ISALPHA (c))
364 c = TOUPPER (c) - L_('A') + 10;
369 /* Check for overflow. */
370 if (i > cutoff || (i == cutoff && c > cutlim))
374 i *= (unsigned LONG int) base;
379 /* Check if anything actually happened. */
383 /* Store in ENDPTR the address of one character
384 past the last character we converted. */
386 *endptr = (STRING_TYPE *) s;
389 /* Check for a value that is within the range of
390 `unsigned LONG int', but outside the range of `LONG int'. */
393 ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
394 : (unsigned LONG int) STRTOL_LONG_MAX))
400 __set_errno (ERANGE);
402 return STRTOL_ULONG_MAX;
404 return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
408 /* Return the result of the appropriate sign. */
409 return negative ? -i : i;
412 /* We must handle a special case here: the base is 0 or 16 and the
413 first two characters are '0' and 'x', but the rest are no
414 hexadecimal digits. This is no error case. We return 0 and
415 ENDPTR points to the `x`. */
418 if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
419 && save[-2] == L_('0'))
420 *endptr = (STRING_TYPE *) &save[-1];
422 /* There was no number to convert. */
423 *endptr = (STRING_TYPE *) nptr;
429 /* External user entry point. */
436 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
437 int base LOCALE_PARAM_PROTO)
439 return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);