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| 1 /* Convert string representation of a number into an integer value. |
| 2 |
| 3 Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003, 2005, |
| 4 2006, 2007 |
| 5 Free Software Foundation, Inc. |
| 6 |
| 7 NOTE: The canonical source of this file is maintained with the GNU C |
| 8 Library. Bugs can be reported to bug-glibc@gnu.org. |
| 9 |
| 10 This program is free software: you can redistribute it and/or modify it |
| 11 under the terms of the GNU General Public License as published by the |
| 12 Free Software Foundation; either version 3 of the License, or any |
| 13 later version. |
| 14 |
| 15 This program is distributed in the hope that it will be useful, |
| 16 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 GNU General Public License for more details. |
| 19 |
| 20 You should have received a copy of the GNU General Public License |
| 21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 22 |
| 23 #ifdef _LIBC |
| 24 # define USE_NUMBER_GROUPING |
| 25 #else |
| 26 # include <config.h> |
| 27 #endif |
| 28 |
| 29 #include <ctype.h> |
| 30 #include <errno.h> |
| 31 #ifndef __set_errno |
| 32 # define __set_errno(Val) errno = (Val) |
| 33 #endif |
| 34 |
| 35 #include <limits.h> |
| 36 #include <stddef.h> |
| 37 #include <stdlib.h> |
| 38 #include <string.h> |
| 39 |
| 40 #ifdef USE_NUMBER_GROUPING |
| 41 # include "../locale/localeinfo.h" |
| 42 #endif |
| 43 |
| 44 /* Nonzero if we are defining `strtoul' or `strtoull', operating on |
| 45 unsigned integers. */ |
| 46 #ifndef UNSIGNED |
| 47 # define UNSIGNED 0 |
| 48 # define INT LONG int |
| 49 #else |
| 50 # define INT unsigned LONG int |
| 51 #endif |
| 52 |
| 53 /* Determine the name. */ |
| 54 #ifdef USE_IN_EXTENDED_LOCALE_MODEL |
| 55 # if UNSIGNED |
| 56 # ifdef USE_WIDE_CHAR |
| 57 # ifdef QUAD |
| 58 # define strtol __wcstoull_l |
| 59 # else |
| 60 # define strtol __wcstoul_l |
| 61 # endif |
| 62 # else |
| 63 # ifdef QUAD |
| 64 # define strtol __strtoull_l |
| 65 # else |
| 66 # define strtol __strtoul_l |
| 67 # endif |
| 68 # endif |
| 69 # else |
| 70 # ifdef USE_WIDE_CHAR |
| 71 # ifdef QUAD |
| 72 # define strtol __wcstoll_l |
| 73 # else |
| 74 # define strtol __wcstol_l |
| 75 # endif |
| 76 # else |
| 77 # ifdef QUAD |
| 78 # define strtol __strtoll_l |
| 79 # else |
| 80 # define strtol __strtol_l |
| 81 # endif |
| 82 # endif |
| 83 # endif |
| 84 #else |
| 85 # if UNSIGNED |
| 86 # ifdef USE_WIDE_CHAR |
| 87 # ifdef QUAD |
| 88 # define strtol wcstoull |
| 89 # else |
| 90 # define strtol wcstoul |
| 91 # endif |
| 92 # else |
| 93 # ifdef QUAD |
| 94 # define strtol strtoull |
| 95 # else |
| 96 # define strtol strtoul |
| 97 # endif |
| 98 # endif |
| 99 # else |
| 100 # ifdef USE_WIDE_CHAR |
| 101 # ifdef QUAD |
| 102 # define strtol wcstoll |
| 103 # else |
| 104 # define strtol wcstol |
| 105 # endif |
| 106 # else |
| 107 # ifdef QUAD |
| 108 # define strtol strtoll |
| 109 # endif |
| 110 # endif |
| 111 # endif |
| 112 #endif |
| 113 |
| 114 /* If QUAD is defined, we are defining `strtoll' or `strtoull', |
| 115 operating on `long long int's. */ |
| 116 #ifdef QUAD |
| 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 |
| 121 |
| 122 /* The extra casts in the following macros work around compiler bugs, |
| 123 e.g., in Cray C 5.0.3.0. */ |
| 124 |
| 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) |
| 132 |
| 133 /* True if the arithmetic type T is signed. */ |
| 134 # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) |
| 135 |
| 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 |
| 139 your host. */ |
| 140 # define TYPE_MINIMUM(t) \ |
| 141 ((t) (! TYPE_SIGNED (t) \ |
| 142 ? (t) 0 \ |
| 143 : TYPE_SIGNED_MAGNITUDE (t) \ |
| 144 ? ~ (t) 0 \ |
| 145 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))) |
| 146 # define TYPE_MAXIMUM(t) \ |
| 147 ((t) (! TYPE_SIGNED (t) \ |
| 148 ? (t) -1 \ |
| 149 : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))) |
| 150 |
| 151 # ifndef ULONG_LONG_MAX |
| 152 # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long) |
| 153 # endif |
| 154 # ifndef LONG_LONG_MAX |
| 155 # define LONG_LONG_MAX TYPE_MAXIMUM (long long int) |
| 156 # endif |
| 157 # ifndef LONG_LONG_MIN |
| 158 # define LONG_LONG_MIN TYPE_MINIMUM (long long int) |
| 159 # endif |
| 160 |
| 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 |
| 166 # endif |
| 167 #else |
| 168 # define LONG long |
| 169 # define STRTOL_LONG_MIN LONG_MIN |
| 170 # define STRTOL_LONG_MAX LONG_MAX |
| 171 # define STRTOL_ULONG_MAX ULONG_MAX |
| 172 #endif |
| 173 |
| 174 |
| 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 |
| 178 macro. */ |
| 179 #ifdef USE_IN_EXTENDED_LOCALE_MODEL |
| 180 # undef _NL_CURRENT |
| 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 |
| 185 #else |
| 186 # define LOCALE_PARAM |
| 187 # define LOCALE_PARAM_PROTO |
| 188 #endif |
| 189 |
| 190 #include <wchar.h> |
| 191 |
| 192 #ifdef USE_WIDE_CHAR |
| 193 # include <wctype.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) |
| 201 # else |
| 202 # define ISSPACE(Ch) iswspace (Ch) |
| 203 # define ISALPHA(Ch) iswalpha (Ch) |
| 204 # define TOUPPER(Ch) towupper (Ch) |
| 205 # endif |
| 206 #else |
| 207 # define L_(Ch) Ch |
| 208 # define UCHAR_TYPE unsigned char |
| 209 # define STRING_TYPE char |
| 210 # ifdef USE_IN_EXTENDED_LOCALE_MODEL |
| 211 # define ISSPACE(Ch) __isspace_l ((Ch), loc) |
| 212 # define ISALPHA(Ch) __isalpha_l ((Ch), loc) |
| 213 # define TOUPPER(Ch) __toupper_l ((Ch), loc) |
| 214 # else |
| 215 # define ISSPACE(Ch) isspace (Ch) |
| 216 # define ISALPHA(Ch) isalpha (Ch) |
| 217 # define TOUPPER(Ch) toupper (Ch) |
| 218 # endif |
| 219 #endif |
| 220 |
| 221 #define INTERNAL(X) INTERNAL1(X) |
| 222 #define INTERNAL1(X) __##X##_internal |
| 223 #define WEAKNAME(X) WEAKNAME1(X) |
| 224 |
| 225 #ifdef USE_NUMBER_GROUPING |
| 226 /* This file defines a function to check for correct grouping. */ |
| 227 # include "grouping.h" |
| 228 #endif |
| 229 |
| 230 |
| 231 |
| 232 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE. |
| 233 If BASE is 0 the base is determined by the presence of a leading |
| 234 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal. |
| 235 If BASE is < 2 or > 36, it is reset to 10. |
| 236 If ENDPTR is not NULL, a pointer to the character after the last |
| 237 one converted is stored in *ENDPTR. */ |
| 238 |
| 239 INT |
| 240 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr, |
| 241 int base, int group LOCALE_PARAM_PROTO) |
| 242 { |
| 243 int negative; |
| 244 register unsigned LONG int cutoff; |
| 245 register unsigned int cutlim; |
| 246 register unsigned LONG int i; |
| 247 register const STRING_TYPE *s; |
| 248 register UCHAR_TYPE c; |
| 249 const STRING_TYPE *save, *end; |
| 250 int overflow; |
| 251 |
| 252 #ifdef USE_NUMBER_GROUPING |
| 253 # ifdef USE_IN_EXTENDED_LOCALE_MODEL |
| 254 struct locale_data *current = loc->__locales[LC_NUMERIC]; |
| 255 # endif |
| 256 /* The thousands character of the current locale. */ |
| 257 wchar_t thousands = L'\0'; |
| 258 /* The numeric grouping specification of the current locale, |
| 259 in the format described in <locale.h>. */ |
| 260 const char *grouping; |
| 261 |
| 262 if (group) |
| 263 { |
| 264 grouping = _NL_CURRENT (LC_NUMERIC, GROUPING); |
| 265 if (*grouping <= 0 || *grouping == CHAR_MAX) |
| 266 grouping = NULL; |
| 267 else |
| 268 { |
| 269 /* Figure out the thousands separator character. */ |
| 270 # if defined _LIBC || defined _HAVE_BTOWC |
| 271 thousands = __btowc (*_NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP)); |
| 272 if (thousands == WEOF) |
| 273 thousands = L'\0'; |
| 274 # endif |
| 275 if (thousands == L'\0') |
| 276 grouping = NULL; |
| 277 } |
| 278 } |
| 279 else |
| 280 grouping = NULL; |
| 281 #endif |
| 282 |
| 283 if (base < 0 || base == 1 || base > 36) |
| 284 { |
| 285 __set_errno (EINVAL); |
| 286 return 0; |
| 287 } |
| 288 |
| 289 save = s = nptr; |
| 290 |
| 291 /* Skip white space. */ |
| 292 while (ISSPACE (*s)) |
| 293 ++s; |
| 294 if (*s == L_('\0')) |
| 295 goto noconv; |
| 296 |
| 297 /* Check for a sign. */ |
| 298 if (*s == L_('-')) |
| 299 { |
| 300 negative = 1; |
| 301 ++s; |
| 302 } |
| 303 else if (*s == L_('+')) |
| 304 { |
| 305 negative = 0; |
| 306 ++s; |
| 307 } |
| 308 else |
| 309 negative = 0; |
| 310 |
| 311 /* Recognize number prefix and if BASE is zero, figure it out ourselves. */ |
| 312 if (*s == L_('0')) |
| 313 { |
| 314 if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X')) |
| 315 { |
| 316 s += 2; |
| 317 base = 16; |
| 318 } |
| 319 else if (base == 0) |
| 320 base = 8; |
| 321 } |
| 322 else if (base == 0) |
| 323 base = 10; |
| 324 |
| 325 /* Save the pointer so we can check later if anything happened. */ |
| 326 save = s; |
| 327 |
| 328 #ifdef USE_NUMBER_GROUPING |
| 329 if (group) |
| 330 { |
| 331 /* Find the end of the digit string and check its grouping. */ |
| 332 end = s; |
| 333 for (c = *end; c != L_('\0'); c = *++end) |
| 334 if ((wchar_t) c != thousands |
| 335 && ((wchar_t) c < L_('0') || (wchar_t) c > L_('9')) |
| 336 && (!ISALPHA (c) || (int) (TOUPPER (c) - L_('A') + 10) >= base)) |
| 337 break; |
| 338 if (*s == thousands) |
| 339 end = s; |
| 340 else |
| 341 end = correctly_grouped_prefix (s, end, thousands, grouping); |
| 342 } |
| 343 else |
| 344 #endif |
| 345 end = NULL; |
| 346 |
| 347 cutoff = STRTOL_ULONG_MAX / (unsigned LONG int) base; |
| 348 cutlim = STRTOL_ULONG_MAX % (unsigned LONG int) base; |
| 349 |
| 350 overflow = 0; |
| 351 i = 0; |
| 352 for (c = *s; c != L_('\0'); c = *++s) |
| 353 { |
| 354 if (s == end) |
| 355 break; |
| 356 if (c >= L_('0') && c <= L_('9')) |
| 357 c -= L_('0'); |
| 358 else if (ISALPHA (c)) |
| 359 c = TOUPPER (c) - L_('A') + 10; |
| 360 else |
| 361 break; |
| 362 if ((int) c >= base) |
| 363 break; |
| 364 /* Check for overflow. */ |
| 365 if (i > cutoff || (i == cutoff && c > cutlim)) |
| 366 overflow = 1; |
| 367 else |
| 368 { |
| 369 i *= (unsigned LONG int) base; |
| 370 i += c; |
| 371 } |
| 372 } |
| 373 |
| 374 /* Check if anything actually happened. */ |
| 375 if (s == save) |
| 376 goto noconv; |
| 377 |
| 378 /* Store in ENDPTR the address of one character |
| 379 past the last character we converted. */ |
| 380 if (endptr != NULL) |
| 381 *endptr = (STRING_TYPE *) s; |
| 382 |
| 383 #if !UNSIGNED |
| 384 /* Check for a value that is within the range of |
| 385 `unsigned LONG int', but outside the range of `LONG int'. */ |
| 386 if (overflow == 0 |
| 387 && i > (negative |
| 388 ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1 |
| 389 : (unsigned LONG int) STRTOL_LONG_MAX)) |
| 390 overflow = 1; |
| 391 #endif |
| 392 |
| 393 if (overflow) |
| 394 { |
| 395 __set_errno (ERANGE); |
| 396 #if UNSIGNED |
| 397 return STRTOL_ULONG_MAX; |
| 398 #else |
| 399 return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX; |
| 400 #endif |
| 401 } |
| 402 |
| 403 /* Return the result of the appropriate sign. */ |
| 404 return negative ? -i : i; |
| 405 |
| 406 noconv: |
| 407 /* We must handle a special case here: the base is 0 or 16 and the |
| 408 first two characters are '0' and 'x', but the rest are no |
| 409 hexadecimal digits. This is no error case. We return 0 and |
| 410 ENDPTR points to the `x`. */ |
| 411 if (endptr != NULL) |
| 412 { |
| 413 if (save - nptr >= 2 && TOUPPER (save[-1]) == L_('X') |
| 414 && save[-2] == L_('0')) |
| 415 *endptr = (STRING_TYPE *) &save[-1]; |
| 416 else |
| 417 /* There was no number to convert. */ |
| 418 *endptr = (STRING_TYPE *) nptr; |
| 419 } |
| 420 |
| 421 return 0L; |
| 422 } |
| 423 |
| 424 /* External user entry point. */ |
| 425 |
| 426 |
| 427 INT |
| 428 #ifdef weak_function |
| 429 weak_function |
| 430 #endif |
| 431 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr, |
| 432 int base LOCALE_PARAM_PROTO) |
| 433 { |
| 434 return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM); |
| 435 } |
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