Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /*
  2. FUNCTION
  3.         <<wcstoul>>---wide string to unsigned long
  4.  
  5. INDEX
  6.         wcstoul
  7. INDEX
  8.         _wcstoul_r
  9.  
  10. ANSI_SYNOPSIS
  11.         #include <wchar.h>
  12.         unsigned long wcstoul(const wchar_t *__restrict <[s]>,
  13.                               wchar_t **__restrict <[ptr]>, int <[base]>);
  14.  
  15.         unsigned long _wcstoul_r(void *<[reent]>, const wchar_t *<[s]>,
  16.                               wchar_t **<[ptr]>, int <[base]>);
  17.  
  18. TRAD_SYNOPSIS
  19.         #include <wchar.h>
  20.         unsigned long wcstoul(<[s]>, <[ptr]>, <[base]>)
  21.         wchar_t *__restrict <[s]>;
  22.         wchar_t **__restrict <[ptr]>;
  23.         int <[base]>;
  24.  
  25.         unsigned long _wcstoul_r(<[reent]>, <[s]>, <[ptr]>, <[base]>)
  26.         wchar_t *<[reent]>;
  27.         wchar_t *<[s]>;
  28.         wchar_t **<[ptr]>;
  29.         int <[base]>;
  30.  
  31. DESCRIPTION
  32. The function <<wcstoul>> converts the wide string <<*<[s]>>> to
  33. an <<unsigned long>>. First, it breaks down the string into three parts:
  34. leading whitespace, which is ignored; a subject string consisting
  35. of the digits meaningful in the radix specified by <[base]>
  36. (for example, <<0>> through <<7>> if the value of <[base]> is 8);
  37. and a trailing portion consisting of one or more unparseable characters,
  38. which always includes the terminating null character. Then, it attempts
  39. to convert the subject string into an unsigned long integer, and returns the
  40. result.
  41.  
  42. If the value of <[base]> is zero, the subject string is expected to look
  43. like a normal C integer constant (save that no optional sign is permitted):
  44. a possible <<0x>> indicating hexadecimal radix, and a number.
  45. If <[base]> is between 2 and 36, the expected form of the subject is a
  46. sequence of digits (which may include letters, depending on the
  47. base) representing an integer in the radix specified by <[base]>.
  48. The letters <<a>>--<<z>> (or <<A>>--<<Z>>) are used as digits valued from
  49. 10 to 35. If <[base]> is 16, a leading <<0x>> is permitted.
  50.  
  51. The subject sequence is the longest initial sequence of the input
  52. string that has the expected form, starting with the first
  53. non-whitespace character.  If the string is empty or consists entirely
  54. of whitespace, or if the first non-whitespace character is not a
  55. permissible digit, the subject string is empty.
  56.  
  57. If the subject string is acceptable, and the value of <[base]> is zero,
  58. <<wcstoul>> attempts to determine the radix from the input string. A
  59. string with a leading <<0x>> is treated as a hexadecimal value; a string with
  60. a leading <<0>> and no <<x>> is treated as octal; all other strings are
  61. treated as decimal. If <[base]> is between 2 and 36, it is used as the
  62. conversion radix, as described above. Finally, a pointer to the first
  63. character past the converted subject string is stored in <[ptr]>, if
  64. <[ptr]> is not <<NULL>>.
  65.  
  66. If the subject string is empty (that is, if <<*>><[s]> does not start
  67. with a substring in acceptable form), no conversion
  68. is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
  69. not <<NULL>>).
  70.  
  71. The alternate function <<_wcstoul_r>> is a reentrant version.  The
  72. extra argument <[reent]> is a pointer to a reentrancy structure.
  73.  
  74.  
  75. RETURNS
  76. <<wcstoul>> returns the converted value, if any. If no conversion was
  77. made, <<0>> is returned.
  78.  
  79. <<wcstoul>> returns <<ULONG_MAX>> if the magnitude of the converted
  80. value is too large, and sets <<errno>> to <<ERANGE>>.
  81.  
  82. PORTABILITY
  83. <<wcstoul>> is ANSI.
  84.  
  85. <<wcstoul>> requires no supporting OS subroutines.
  86. */
  87.  
  88. /*
  89.  * Copyright (c) 1990 Regents of the University of California.
  90.  * All rights reserved.
  91.  *
  92.  * Redistribution and use in source and binary forms, with or without
  93.  * modification, are permitted provided that the following conditions
  94.  * are met:
  95.  * 1. Redistributions of source code must retain the above copyright
  96.  *    notice, this list of conditions and the following disclaimer.
  97.  * 2. Redistributions in binary form must reproduce the above copyright
  98.  *    notice, this list of conditions and the following disclaimer in the
  99.  *    documentation and/or other materials provided with the distribution.
  100.  * 3. All advertising materials mentioning features or use of this software
  101.  *    must display the following acknowledgement:
  102.  *      This product includes software developed by the University of
  103.  *      California, Berkeley and its contributors.
  104.  * 4. Neither the name of the University nor the names of its contributors
  105.  *    may be used to endorse or promote products derived from this software
  106.  *    without specific prior written permission.
  107.  *
  108.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  109.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  110.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  111.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  112.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  113.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  114.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  115.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  116.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  117.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  118.  * SUCH DAMAGE.
  119.  */
  120.  
  121. #include <_ansi.h>
  122. #include <limits.h>
  123. #include <wctype.h>
  124. #include <wchar.h>
  125. #include <errno.h>
  126. #include <stdlib.h>
  127. #include <reent.h>
  128.  
  129. /*
  130.  * Convert a wide string to an unsigned long integer.
  131.  *
  132.  * Ignores `locale' stuff.  Assumes that the upper and lower case
  133.  * alphabets and digits are each contiguous.
  134.  */
  135. unsigned long
  136. _DEFUN (_wcstoul_r, (rptr, nptr, endptr, base),
  137.         struct _reent *rptr _AND
  138.         _CONST wchar_t *nptr _AND
  139.         wchar_t **endptr _AND
  140.         int base)
  141. {
  142.         register const wchar_t *s = nptr;
  143.         register unsigned long acc;
  144.         register int c;
  145.         register unsigned long cutoff;
  146.         register int neg = 0, any, cutlim;
  147.  
  148.         /*
  149.          * See strtol for comments as to the logic used.
  150.          */
  151.         do {
  152.                 c = *s++;
  153.         } while (iswspace(c));
  154.         if (c == L'-') {
  155.                 neg = 1;
  156.                 c = *s++;
  157.         } else if (c == L'+')
  158.                 c = *s++;
  159.         if ((base == 0 || base == 16) &&
  160.             c == L'0' && (*s == L'x' || *s == L'X')) {
  161.                 c = s[1];
  162.                 s += 2;
  163.                 base = 16;
  164.         }
  165.         if (base == 0)
  166.                 base = c == L'0' ? 8 : 10;
  167.         cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
  168.         cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
  169.         for (acc = 0, any = 0;; c = *s++) {
  170.                 if (iswdigit(c))
  171.                         c -= L'0';
  172.                 else if (iswalpha(c))
  173.                         c -= iswupper(c) ? L'A' - 10 : L'a' - 10;
  174.                 else
  175.                         break;
  176.                 if (c >= base)
  177.                         break;
  178.                if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
  179.                         any = -1;
  180.                 else {
  181.                         any = 1;
  182.                         acc *= base;
  183.                         acc += c;
  184.                 }
  185.         }
  186.         if (any < 0) {
  187.                 acc = ULONG_MAX;
  188.                 rptr->_errno = ERANGE;
  189.         } else if (neg)
  190.                 acc = -acc;
  191.         if (endptr != 0)
  192.                 *endptr = (wchar_t *) (any ? s - 1 : nptr);
  193.         return (acc);
  194. }
  195.  
  196. #ifndef _REENT_ONLY
  197.  
  198. unsigned long
  199. _DEFUN (wcstoul, (s, ptr, base),
  200.         _CONST wchar_t *__restrict s _AND
  201.         wchar_t **__restrict ptr _AND
  202.         int base)
  203. {
  204.         return _wcstoul_r (_REENT, s, ptr, base);
  205. }
  206.  
  207. #endif
  208.