1 /* Convert string representation of a number into an integer value.
2
3 Copyright (C) 1991-1992, 1994-1999, 2003, 2005-2007, 2009-2012 Free Software
4 Foundation, Inc.
5
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.
8
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 3 of the License, or any
12 later version.
13
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.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22 #ifdef _LIBC
23 # define USE_NUMBER_GROUPING
24 #else
25 # include <config.h>
26 #endif
27
28 #include <ctype.h>
29 #include <errno.h>
30 #ifndef __set_errno
31 # define __set_errno(Val) errno = (Val)
32 #endif
33
34 #include <limits.h>
35 #include <stddef.h>
36 #include <stdlib.h>
37 #include <string.h>
38
39 #ifdef USE_NUMBER_GROUPING
40 # include "../locale/localeinfo.h"
41 #endif
42
43 /* Nonzero if we are defining 'strtoul' or 'strtoull', operating on
44 unsigned integers. */
45 #ifndef UNSIGNED
46 # define UNSIGNED 0
47 # define INT LONG int
48 #else
49 # define INT unsigned LONG int
50 #endif
51
52 /* Determine the name. */
53 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
54 # if UNSIGNED
55 # ifdef USE_WIDE_CHAR
56 # ifdef QUAD
57 # define strtol __wcstoull_l
58 # else
59 # define strtol __wcstoul_l
60 # endif
61 # else
62 # ifdef QUAD
63 # define strtol __strtoull_l
64 # else
65 # define strtol __strtoul_l
66 # endif
67 # endif
68 # else
69 # ifdef USE_WIDE_CHAR
70 # ifdef QUAD
71 # define strtol __wcstoll_l
72 # else
73 # define strtol __wcstol_l
74 # endif
75 # else
76 # ifdef QUAD
77 # define strtol __strtoll_l
78 # else
79 # define strtol __strtol_l
80 # endif
81 # endif
82 # endif
83 #else
84 # if UNSIGNED
85 # ifdef USE_WIDE_CHAR
86 # ifdef QUAD
87 # define strtol wcstoull
88 # else
89 # define strtol wcstoul
90 # endif
91 # else
92 # ifdef QUAD
93 # define strtol strtoull
94 # else
95 # define strtol strtoul
96 # endif
97 # endif
98 # else
99 # ifdef USE_WIDE_CHAR
100 # ifdef QUAD
101 # define strtol wcstoll
102 # else
103 # define strtol wcstol
104 # endif
105 # else
106 # ifdef QUAD
107 # define strtol strtoll
108 # endif
109 # endif
110 # endif
111 #endif
112
113 /* If QUAD is defined, we are defining 'strtoll' or 'strtoull',
114 operating on 'long long int's. */
115 #ifdef QUAD
116 # define LONG long long
117 # define STRTOL_LONG_MIN LLONG_MIN
118 # define STRTOL_LONG_MAX LLONG_MAX
119 # define STRTOL_ULONG_MAX ULLONG_MAX
120
121 /* The extra casts in the following macros work around compiler bugs,
122 e.g., in Cray C 5.0.3.0. */
123
124 /* True if negative values of the signed integer type T use two's
125 complement, ones' complement, or signed magnitude representation,
126 respectively. Much GNU code assumes two's complement, but some
127 people like to be portable to all possible C hosts. */
128 # define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1)
129 # define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0)
130 # define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
131
132 /* True if the arithmetic type T is signed. */
133 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
134
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 If this is a problem for you, please let us know how to fix it for
138 your host. */
139 # define TYPE_MINIMUM(t) \
140 ((t) (! TYPE_SIGNED (t) \
141 ? (t) 0 \
142 : TYPE_SIGNED_MAGNITUDE (t) \
143 ? ~ (t) 0 \
144 : ~ TYPE_MAXIMUM (t)))
145 # define TYPE_MAXIMUM(t) \
146 ((t) (! TYPE_SIGNED (t) \
147 ? (t) -1 \
148 : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
149
150 # ifndef ULLONG_MAX
151 # define ULLONG_MAX TYPE_MAXIMUM (unsigned long long)
152 # endif
153 # ifndef LLONG_MAX
154 # define LLONG_MAX TYPE_MAXIMUM (long long int)
155 # endif
156 # ifndef LLONG_MIN
157 # define LLONG_MIN TYPE_MINIMUM (long long int)
158 # endif
159
160 # if __GNUC__ == 2 && __GNUC_MINOR__ < 7
161 /* Work around gcc bug with using this constant. */
162 static const unsigned long long int maxquad = ULLONG_MAX;
163 # undef STRTOL_ULONG_MAX
164 # define STRTOL_ULONG_MAX maxquad
165 # endif
166 #else
167 # define LONG long
168 # define STRTOL_LONG_MIN LONG_MIN
169 # define STRTOL_LONG_MAX LONG_MAX
170 # define STRTOL_ULONG_MAX ULONG_MAX
171 #endif
172
173
174 /* We use this code also for the extended locale handling where the
175 function gets as an additional argument the locale which has to be
176 used. To access the values we have to redefine the _NL_CURRENT
177 macro. */
178 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
179 # undef _NL_CURRENT
180 # define _NL_CURRENT(category, item) \
181 (current->values[_NL_ITEM_INDEX (item)].string)
182 # define LOCALE_PARAM , loc
183 # define LOCALE_PARAM_PROTO , __locale_t loc
184 #else
185 # define LOCALE_PARAM
186 # define LOCALE_PARAM_PROTO
187 #endif
188
189 #ifdef USE_WIDE_CHAR
190 # include <wchar.h>
191 # include <wctype.h>
192 # define L_(Ch) L##Ch
193 # define UCHAR_TYPE wint_t
194 # define STRING_TYPE wchar_t
195 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
196 # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
197 # define ISALPHA(Ch) __iswalpha_l ((Ch), loc)
198 # define TOUPPER(Ch) __towupper_l ((Ch), loc)
199 # else
200 # define ISSPACE(Ch) iswspace (Ch)
201 # define ISALPHA(Ch) iswalpha (Ch)
202 # define TOUPPER(Ch) towupper (Ch)
203 # endif
204 #else
205 # define L_(Ch) Ch
206 # define UCHAR_TYPE unsigned char
207 # define STRING_TYPE char
208 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
209 # define ISSPACE(Ch) __isspace_l ((Ch), loc)
210 # define ISALPHA(Ch) __isalpha_l ((Ch), loc)
211 # define TOUPPER(Ch) __toupper_l ((Ch), loc)
212 # else
213 # define ISSPACE(Ch) isspace (Ch)
214 # define ISALPHA(Ch) isalpha (Ch)
215 # define TOUPPER(Ch) toupper (Ch)
216 # endif
217 #endif
218
219 #define INTERNAL(X) INTERNAL1(X)
220 #define INTERNAL1(X) __##X##_internal
221 #define WEAKNAME(X) WEAKNAME1(X)
222
223 #ifdef USE_NUMBER_GROUPING
224 /* This file defines a function to check for correct grouping. */
225 # include "grouping.h"
226 #endif
227
228
229
230 /* Convert NPTR to an 'unsigned long int' or 'long int' in base BASE.
231 If BASE is 0 the base is determined by the presence of a leading
232 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
233 If BASE is < 2 or > 36, it is reset to 10.
234 If ENDPTR is not NULL, a pointer to the character after the last
235 one converted is stored in *ENDPTR. */
236
237 INT
INTERNAL(strtol)238 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
239 int base, int group LOCALE_PARAM_PROTO)
240 {
241 int negative;
242 register unsigned LONG int cutoff;
243 register unsigned int cutlim;
244 register unsigned LONG int i;
245 register const STRING_TYPE *s;
246 register UCHAR_TYPE c;
247 const STRING_TYPE *save, *end;
248 int overflow;
249
250 #ifdef USE_NUMBER_GROUPING
251 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
252 struct locale_data *current = loc->__locales[LC_NUMERIC];
253 # endif
254 /* The thousands character of the current locale. */
255 wchar_t thousands = L'\0';
256 /* The numeric grouping specification of the current locale,
257 in the format described in <locale.h>. */
258 const char *grouping;
259
260 if (group)
261 {
262 grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
263 if (*grouping <= 0 || *grouping == CHAR_MAX)
264 grouping = NULL;
265 else
266 {
267 /* Figure out the thousands separator character. */
268 # if defined _LIBC || defined _HAVE_BTOWC
269 thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP));
270 if (thousands == WEOF)
271 thousands = L'\0';
272 # endif
273 if (thousands == L'\0')
274 grouping = NULL;
275 }
276 }
277 else
278 grouping = NULL;
279 #endif
280
281 if (base < 0 || base == 1 || base > 36)
282 {
283 __set_errno (EINVAL);
284 return 0;
285 }
286
287 save = s = nptr;
288
289 /* Skip white space. */
290 while (ISSPACE (*s))
291 ++s;
292 if (*s == L_('\0'))
293 goto noconv;
294
295 /* Check for a sign. */
296 if (*s == L_('-'))
297 {
298 negative = 1;
299 ++s;
300 }
301 else if (*s == L_('+'))
302 {
303 negative = 0;
304 ++s;
305 }
306 else
307 negative = 0;
308
309 /* Recognize number prefix and if BASE is zero, figure it out ourselves. */
310 if (*s == L_('0'))
311 {
312 if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
313 {
314 s += 2;
315 base = 16;
316 }
317 else if (base == 0)
318 base = 8;
319 }
320 else if (base == 0)
321 base = 10;
322
323 /* Save the pointer so we can check later if anything happened. */
324 save = s;
325
326 #ifdef USE_NUMBER_GROUPING
327 if (group)
328 {
329 /* Find the end of the digit string and check its grouping. */
330 end = s;
331 for (c = *end; c != L_('\0'); c = *++end)
332 if ((wchar_t) c != thousands
333 && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9'))
334 && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base))
335 break;
336 if (*s == thousands)
337 end = s;
338 else
339 end = correctly_grouped_prefix (s, end, thousands, grouping);
340 }
341 else
342 #endif
343 end = NULL;
344
345 cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base;
346 cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base;
347
348 overflow = 0;
349 i = 0;
350 for (c = *s; c != L_('\0'); c = *++s)
351 {
352 if (s == end)
353 break;
354 if (c >= L_('0') && c <= L_('9'))
355 c -= L_('0');
356 else if (ISALPHA (c))
357 c = TOUPPER (c) - L_('A') + 10;
358 else
359 break;
360 if ((int) c >= base)
361 break;
362 /* Check for overflow. */
363 if (i > cutoff || (i == cutoff && c > cutlim))
364 overflow = 1;
365 else
366 {
367 i *= (unsigned LONG int) base;
368 i += c;
369 }
370 }
371
372 /* Check if anything actually happened. */
373 if (s == save)
374 goto noconv;
375
376 /* Store in ENDPTR the address of one character
377 past the last character we converted. */
378 if (endptr != NULL)
379 *endptr = (STRING_TYPE *) s;
380
381 #if !UNSIGNED
382 /* Check for a value that is within the range of
383 'unsigned LONG int', but outside the range of 'LONG int'. */
384 if (overflow == 0
385 && i > (negative
386 ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
387 : (unsigned LONG int) STRTOL_LONG_MAX))
388 overflow = 1;
389 #endif
390
391 if (overflow)
392 {
393 __set_errno (ERANGE);
394 #if UNSIGNED
395 return STRTOL_ULONG_MAX;
396 #else
397 return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
398 #endif
399 }
400
401 /* Return the result of the appropriate sign. */
402 return negative ? -i : i;
403
404 noconv:
405 /* We must handle a special case here: the base is 0 or 16 and the
406 first two characters are '0' and 'x', but the rest are no
407 hexadecimal digits. This is no error case. We return 0 and
408 ENDPTR points to the 'x'. */
409 if (endptr != NULL)
410 {
411 if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X')
412 && save[-2] == L_('0'))
413 *endptr = (STRING_TYPE *) &save[-1];
414 else
415 /* There was no number to convert. */
416 *endptr = (STRING_TYPE *) nptr;
417 }
418
419 return 0L;
420 }
421
422 /* External user entry point. */
423
424
425 INT
426 #ifdef weak_function
427 weak_function
428 #endif
strtol(const STRING_TYPE * nptr,STRING_TYPE ** endptr,int base LOCALE_PARAM_PROTO)429 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
430 int base LOCALE_PARAM_PROTO)
431 {
432 return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
433 }
434