stdlib/strtol_l.c

   1 /* Convert string representing a number to integer value, using given locale.
   2    Copyright (C) 1997-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <features.h>
  20 #undef __GLIBC_USE_C2X_STRTOL
  21 #define __GLIBC_USE_C2X_STRTOL 0
  22
  23 #if HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #ifdef _LIBC
  28 # define USE_NUMBER_GROUPING
  29 # define HAVE_LIMITS_H
  30 #endif
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #ifndef __set_errno
  35 # define __set_errno(Val) errno = (Val)
  36 #endif
  37
  38 #ifdef HAVE_LIMITS_H
  39 # include <limits.h>
  40 #endif
  41
  42 #include <stddef.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <locale.h>
  46 #include <stdint.h>
  47 #include <bits/wordsize.h>
  48
  49 #ifdef USE_NUMBER_GROUPING
  50 # include "../locale/localeinfo.h"
  51 #endif
  52
  53 /* Nonzero if we are defining `strtoul' or `strtoull', operating on
  54    unsigned integers.  */
  55 #ifndef UNSIGNED
  56 # define UNSIGNED 0
  57 # define INT LONG int
  58 #else
  59 # define INT unsigned LONG int
  60 #endif
  61
  62 /* Determine the name.  */
  63 #if UNSIGNED
  64 # ifdef USE_WIDE_CHAR
  65 #  ifdef QUAD
  66 #   define strtol_l wcstoull_l
  67 #   define __isoc23_strtol_l __isoc23_wcstoull_l
  68 #  else
  69 #   define strtol_l wcstoul_l
  70 #   define __isoc23_strtol_l __isoc23_wcstoul_l
  71 #  endif
  72 # else
  73 #  ifdef QUAD
  74 #   define strtol_l strtoull_l
  75 #   define __isoc23_strtol_l __isoc23_strtoull_l
  76 #  else
  77 #   define strtol_l strtoul_l
  78 #   define __isoc23_strtol_l __isoc23_strtoul_l
  79 #  endif
  80 # endif
  81 #else
  82 # ifdef USE_WIDE_CHAR
  83 #  ifdef QUAD
  84 #   define strtol_l wcstoll_l
  85 #   define __isoc23_strtol_l __isoc23_wcstoll_l
  86 #  else
  87 #   define strtol_l wcstol_l
  88 #   define __isoc23_strtol_l __isoc23_wcstol_l
  89 #  endif
  90 # else
  91 #  ifdef QUAD
  92 #   define strtol_l strtoll_l
  93 #   define __isoc23_strtol_l __isoc23_strtoll_l
  94 #  else
  95 #   define strtol_l strtol_l
  96 #   define __isoc23_strtol_l __isoc23_strtol_l
  97 #  endif
  98 # endif
  99 #endif
 100
 101 #define __strtol_l __strtol_l2(strtol_l)
 102 #define __strtol_l2(name) __strtol_l3(name)
 103 #define __strtol_l3(name) __##name
 104
 105
 106 /* If QUAD is defined, we are defining `strtoll' or `strtoull',
 107    operating on `long long int's.  */
 108 #ifdef QUAD
 109 # define LONG long long
 110 # define STRTOL_LONG_MIN LONG_LONG_MIN
 111 # define STRTOL_LONG_MAX LONG_LONG_MAX
 112 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
 113 #else
 114 # define LONG long
 115
 116 # ifndef ULONG_MAX
 117 #  define ULONG_MAX ((unsigned long int) ~(unsigned long int) 0)
 118 # endif
 119 # ifndef LONG_MAX
 120 #  define LONG_MAX ((long int) (ULONG_MAX >> 1))
 121 # endif
 122 # define STRTOL_LONG_MIN LONG_MIN
 123 # define STRTOL_LONG_MAX LONG_MAX
 124 # define STRTOL_ULONG_MAX ULONG_MAX
 125 #endif
 126
 127
 128 /* We use this code for the extended locale handling where the
 129    function gets as an additional argument the locale which has to be
 130    used.  To access the values we have to redefine the _NL_CURRENT and
 131    _NL_CURRENT_WORD macros.  */
 132 #undef _NL_CURRENT
 133 #define _NL_CURRENT(category, item) \
 134   (current->values[_NL_ITEM_INDEX (item)].string)
 135 #undef _NL_CURRENT_WORD
 136 #define _NL_CURRENT_WORD(category, item) \
 137   ((uint32_t) current->values[_NL_ITEM_INDEX (item)].word)
 138
 139 #if defined _LIBC || defined HAVE_WCHAR_H
 140 # include <wchar.h>
 141 #endif
 142
 143 #ifdef USE_WIDE_CHAR
 144 # include <wctype.h>
 145 # define L_(Ch) L##Ch
 146 # define UCHAR_TYPE wint_t
 147 # define STRING_TYPE wchar_t
 148 # define ISSPACE(Ch) __iswspace_l ((Ch), loc)
 149 # define ISALPHA(Ch) __iswalpha_l ((Ch), _nl_C_locobj_ptr)
 150 # define TOUPPER(Ch) __towupper_l ((Ch), _nl_C_locobj_ptr)
 151 #else
 152 # if defined _LIBC \
 153    || defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
 154 #  define IN_CTYPE_DOMAIN(c) 1
 155 # else
 156 #  define IN_CTYPE_DOMAIN(c) isascii(c)
 157 # endif
 158 # define L_(Ch) Ch
 159 # define UCHAR_TYPE unsigned char
 160 # define STRING_TYPE char
 161 # define ISSPACE(Ch) __isspace_l ((Ch), loc)
 162 # define ISALPHA(Ch) __isalpha_l ((Ch), _nl_C_locobj_ptr)
 163 # define TOUPPER(Ch) __toupper_l ((Ch), _nl_C_locobj_ptr)
 164 #endif
 165
 166 #define INTERNAL(X) INTERNAL1(X)
 167 #define INTERNAL1(X) __##X##_internal
 168 #define WEAKNAME(X) WEAKNAME1(X)
 169
 170 #ifdef USE_NUMBER_GROUPING
 171 /* This file defines a function to check for correct grouping.  */
 172 # include "grouping.h"
 173 #endif
 174
 175
 176 /* Define tables of maximum values and remainders in order to detect
 177    overflow.  Do this at compile-time in order to avoid the runtime
 178    overhead of the division.  */
 179 extern const unsigned long __strtol_ul_max_tab[] attribute_hidden;
 180 extern const unsigned char __strtol_ul_rem_tab[] attribute_hidden;
 181 #if defined(QUAD) && __WORDSIZE == 32
 182 extern const unsigned long long __strtol_ull_max_tab[] attribute_hidden;
 183 extern const unsigned char __strtol_ull_rem_tab[] attribute_hidden;
 184 #endif
 185
 186 #define DEF(TYPE, NAME)                                                    \
 187   const TYPE NAME[] attribute_hidden =                                     \
 188   {                                                                        \
 189     F(2), F(3), F(4), F(5), F(6), F(7), F(8), F(9), F(10),                 \
 190     F(11), F(12), F(13), F(14), F(15), F(16), F(17), F(18), F(19), F(20),  \
 191     F(21), F(22), F(23), F(24), F(25), F(26), F(27), F(28), F(29), F(30),  \
 192     F(31), F(32), F(33), F(34), F(35), F(36)                               \
 193   }
 194
 195 #if !UNSIGNED && !defined (USE_WIDE_CHAR) && !defined (QUAD)
 196 # define F(X)   ULONG_MAX / X
 197   DEF (unsigned long, __strtol_ul_max_tab);
 198 # undef F
 199 # define F(X)   ULONG_MAX % X
 200   DEF (unsigned char, __strtol_ul_rem_tab);
 201 # undef F
 202 #endif
 203 #if !UNSIGNED && !defined (USE_WIDE_CHAR) && defined (QUAD) \
 204     && __WORDSIZE == 32
 205 # define F(X)   ULONG_LONG_MAX / X
 206   DEF (unsigned long long, __strtol_ull_max_tab);
 207 # undef F
 208 # define F(X)   ULONG_LONG_MAX % X
 209   DEF (unsigned char, __strtol_ull_rem_tab);
 210 # undef F
 211 #endif
 212 #undef DEF
 213
 214 /* Define some more readable aliases for these arrays which correspond
 215    to how they'll be used in the function below.  */
 216 #define jmax_tab        __strtol_ul_max_tab
 217 #if defined(QUAD) && __WORDSIZE == 32
 218 # define cutoff_tab     __strtol_ull_max_tab
 219 # define cutlim_tab     __strtol_ull_rem_tab
 220 #else
 221 # define cutoff_tab     __strtol_ul_max_tab
 222 # define cutlim_tab     __strtol_ul_rem_tab
 223 #endif
 224
 225
 226 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
 227    If BASE is 0 the base is determined by the presence of a leading
 228    zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
 229    If BASE is < 2 or > 36, it is reset to 10.
 230    If BIN_CST is true, binary constants starting "0b" or "0B" are accepted
 231    in base 0 and 2.
 232    If ENDPTR is not NULL, a pointer to the character after the last
 233    one converted is stored in *ENDPTR.  */
 234
 235 INT
 236 INTERNAL (__strtol_l) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 237                        int base, int group, bool bin_cst, locale_t loc)
 238 {
 239   int negative;
 240   unsigned LONG int cutoff;
 241   unsigned int cutlim;
 242   unsigned LONG int i;
 243   const STRING_TYPE *s;
 244   UCHAR_TYPE c;
 245   const STRING_TYPE *save, *end;
 246   int overflow;
 247 #ifndef USE_WIDE_CHAR
 248   size_t cnt;
 249 #endif
 250
 251 #ifdef USE_NUMBER_GROUPING
 252   struct __locale_data *current = loc->__locales[LC_NUMERIC];
 253   /* The thousands character of the current locale.  */
 254 # ifdef USE_WIDE_CHAR
 255   wchar_t thousands = L'\0';
 256 # else
 257   const char *thousands = NULL;
 258   size_t thousands_len = 0;
 259 # endif
 260   /* The numeric grouping specification of the current locale,
 261      in the format described in <locale.h>.  */
 262   const char *grouping;
 263
 264   if (__glibc_unlikely (group))
 265     {
 266       grouping = _NL_CURRENT (LC_NUMERIC, GROUPING);
 267       if (*grouping <= 0 || *grouping == CHAR_MAX)
 268         grouping = NULL;
 269       else
 270         {
 271           /* Figure out the thousands separator character.  */
 272 # ifdef USE_WIDE_CHAR
 273 #  ifdef _LIBC
 274           thousands = _NL_CURRENT_WORD (LC_NUMERIC,
 275                                         _NL_NUMERIC_THOUSANDS_SEP_WC);
 276 #  endif
 277           if (thousands == L'\0')
 278             grouping = NULL;
 279 # else
 280 #  ifdef _LIBC
 281           thousands = _NL_CURRENT (LC_NUMERIC, THOUSANDS_SEP);
 282 #  endif
 283           if (*thousands == '\0')
 284             {
 285               thousands = NULL;
 286               grouping = NULL;
 287             }
 288 # endif
 289         }
 290     }
 291   else
 292     grouping = NULL;
 293 #endif
 294
 295   if (base < 0 || base == 1 || base > 36)
 296     {
 297       __set_errno (EINVAL);
 298       return 0;
 299     }
 300
 301   save = s = nptr;
 302
 303   /* Skip white space.  */
 304   while (ISSPACE (*s))
 305     ++s;
 306   if (__glibc_unlikely (*s == L_('\0')))
 307     goto noconv;
 308
 309   /* Check for a sign.  */
 310   negative = 0;
 311   if (*s == L_('-'))
 312     {
 313       negative = 1;
 314       ++s;
 315     }
 316   else if (*s == L_('+'))
 317     ++s;
 318
 319   /* Recognize number prefix and if BASE is zero, figure it out ourselves.  */
 320   if (*s == L_('0'))
 321     {
 322       if ((base == 0 || base == 16) && TOUPPER (s[1]) == L_('X'))
 323         {
 324           s += 2;
 325           base = 16;
 326         }
 327       else if (bin_cst && (base == 0 || base == 2) && TOUPPER (s[1]) == L_('B'))
 328         {
 329           s += 2;
 330           base = 2;
 331         }
 332       else if (base == 0)
 333         base = 8;
 334     }
 335   else if (base == 0)
 336     base = 10;
 337
 338   /* Save the pointer so we can check later if anything happened.  */
 339   save = s;
 340
 341 #ifdef USE_NUMBER_GROUPING
 342   if (base != 10)
 343     grouping = NULL;
 344
 345   if (__glibc_unlikely (grouping != NULL))
 346     {
 347 # ifndef USE_WIDE_CHAR
 348       thousands_len = strlen (thousands);
 349 # endif
 350
 351       /* Find the end of the digit string and check its grouping.  */
 352       end = s;
 353       if (
 354 # ifdef USE_WIDE_CHAR
 355           *s != thousands
 356 # else
 357           ({ for (cnt = 0; cnt < thousands_len; ++cnt)
 358                if (thousands[cnt] != end[cnt])
 359                  break;
 360              cnt < thousands_len; })
 361 # endif
 362           )
 363         {
 364           for (c = *end; c != L_('\0'); c = *++end)
 365             if (((STRING_TYPE) c < L_('0') || (STRING_TYPE) c > L_('9'))
 366 # ifdef USE_WIDE_CHAR
 367                 && (wchar_t) c != thousands
 368 # else
 369                 && ({ for (cnt = 0; cnt < thousands_len; ++cnt)
 370                         if (thousands[cnt] != end[cnt])
 371                           break;
 372                       cnt < thousands_len; })
 373 # endif
 374                 && (!ISALPHA (c)
 375                     || (int) (TOUPPER (c) - L_('A') + 10) >= base))
 376               break;
 377
 378 # ifdef USE_WIDE_CHAR
 379           end = __correctly_grouped_prefixwc (s, end, thousands, grouping);
 380 # else
 381           end = __correctly_grouped_prefixmb (s, end, thousands, grouping);
 382 # endif
 383         }
 384     }
 385   else
 386 #endif
 387     end = NULL;
 388
 389   /* Avoid runtime division; lookup cutoff and limit.  */
 390   cutoff = cutoff_tab[base - 2];
 391   cutlim = cutlim_tab[base - 2];
 392
 393   overflow = 0;
 394   i = 0;
 395   c = *s;
 396   if (sizeof (long int) != sizeof (LONG int))
 397     {
 398       unsigned long int j = 0;
 399       unsigned long int jmax = jmax_tab[base - 2];
 400
 401       for (;c != L_('\0'); c = *++s)
 402         {
 403           if (s == end)
 404             break;
 405           if (c >= L_('0') && c <= L_('9'))
 406             c -= L_('0');
 407 #ifdef USE_NUMBER_GROUPING
 408 # ifdef USE_WIDE_CHAR
 409           else if (grouping && (wchar_t) c == thousands)
 410             continue;
 411 # else
 412           else if (thousands_len)
 413             {
 414               for (cnt = 0; cnt < thousands_len; ++cnt)
 415                 if (thousands[cnt] != s[cnt])
 416                   break;
 417               if (cnt == thousands_len)
 418                 {
 419                   s += thousands_len - 1;
 420                   continue;
 421                 }
 422               if (ISALPHA (c))
 423                 c = TOUPPER (c) - L_('A') + 10;
 424               else
 425                 break;
 426             }
 427 # endif
 428 #endif
 429           else if (ISALPHA (c))
 430             c = TOUPPER (c) - L_('A') + 10;
 431           else
 432             break;
 433           if ((int) c >= base)
 434             break;
 435           /* Note that we never can have an overflow.  */
 436           else if (j >= jmax)
 437             {
 438               /* We have an overflow.  Now use the long representation.  */
 439               i = (unsigned LONG int) j;
 440               goto use_long;
 441             }
 442           else
 443             j = j * (unsigned long int) base + c;
 444         }
 445
 446       i = (unsigned LONG int) j;
 447     }
 448   else
 449     for (;c != L_('\0'); c = *++s)
 450       {
 451         if (s == end)
 452           break;
 453         if (c >= L_('0') && c <= L_('9'))
 454           c -= L_('0');
 455 #ifdef USE_NUMBER_GROUPING
 456 # ifdef USE_WIDE_CHAR
 457         else if (grouping && (wchar_t) c == thousands)
 458           continue;
 459 # else
 460         else if (thousands_len)
 461           {
 462             for (cnt = 0; cnt < thousands_len; ++cnt)
 463               if (thousands[cnt] != s[cnt])
 464                 break;
 465             if (cnt == thousands_len)
 466               {
 467                 s += thousands_len - 1;
 468                 continue;
 469               }
 470             if (ISALPHA (c))
 471               c = TOUPPER (c) - L_('A') + 10;
 472             else
 473               break;
 474           }
 475 # endif
 476 #endif
 477         else if (ISALPHA (c))
 478           c = TOUPPER (c) - L_('A') + 10;
 479         else
 480           break;
 481         if ((int) c >= base)
 482           break;
 483         /* Check for overflow.  */
 484         if (i > cutoff || (i == cutoff && c > cutlim))
 485           overflow = 1;
 486         else
 487           {
 488           use_long:
 489             i *= (unsigned LONG int) base;
 490             i += c;
 491           }
 492       }
 493
 494   /* Check if anything actually happened.  */
 495   if (s == save)
 496     goto noconv;
 497
 498   /* Store in ENDPTR the address of one character
 499      past the last character we converted.  */
 500   if (endptr != NULL)
 501     *endptr = (STRING_TYPE *) s;
 502
 503 #if !UNSIGNED
 504   /* Check for a value that is within the range of
 505      `unsigned LONG int', but outside the range of `LONG int'.  */
 506   if (overflow == 0
 507       && i > (negative
 508               ? -((unsigned LONG int) (STRTOL_LONG_MIN + 1)) + 1
 509               : (unsigned LONG int) STRTOL_LONG_MAX))
 510     overflow = 1;
 511 #endif
 512
 513   if (__glibc_unlikely (overflow))
 514     {
 515       __set_errno (ERANGE);
 516 #if UNSIGNED
 517       return STRTOL_ULONG_MAX;
 518 #else
 519       return negative ? STRTOL_LONG_MIN : STRTOL_LONG_MAX;
 520 #endif
 521     }
 522
 523   /* Return the result of the appropriate sign.  */
 524   return negative ? -i : i;
 525
 526 noconv:
 527   /* We must handle a special case here: the base is 0 or 16 and the
 528      first two characters are '0' and 'x', but the rest are no
 529      hexadecimal digits.  Likewise when the base is 0 or 2 and the
 530      first two characters are '0' and 'b', but the rest are no binary
 531      digits.  This is no error case.  We return 0 and ENDPTR points to
 532      the 'x' or 'b'.  */
 533   if (endptr != NULL)
 534     {
 535       if (save - nptr >= 2
 536           && (TOUPPER (save[-1]) == L_('X')
 537               || (bin_cst && TOUPPER (save[-1]) == L_('B')))
 538           && save[-2] == L_('0'))
 539         *endptr = (STRING_TYPE *) &save[-1];
 540       else
 541         /*  There was no number to convert.  */
 542         *endptr = (STRING_TYPE *) nptr;
 543     }
 544
 545   return 0L;
 546 }
 547 #if defined _LIBC && !defined USE_WIDE_CHAR
 548 libc_hidden_def (INTERNAL (__strtol_l))
 549 #endif
 550 \f
 551 /* External user entry point.  */
 552
 553 #if _LIBC - 0 == 0
 554
 555 /* Prototype.  */
 556 extern INT __strtol_l (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 557                        int base);
 558 #endif
 559
 560
 561 INT
 562 #ifdef weak_function
 563 weak_function
 564 #endif
 565 __strtol_l (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 566             int base, locale_t loc)
 567 {
 568   return INTERNAL (__strtol_l) (nptr, endptr, base, 0, false, loc);
 569 }
 570 libc_hidden_def (__strtol_l)
 571 weak_alias (__strtol_l, strtol_l)
 572
 573 INT
 574 __isoc23_strtol_l (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 575                    int base, locale_t loc)
 576 {
 577   return INTERNAL (__strtol_l) (nptr, endptr, base, 0, true, loc);
 578 }
 579 libc_hidden_def (__isoc23_strtol_l)