This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any discrepancy between this version and the original
       IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee  document.
       The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                        WCSTOL(3POSIX)

       The  functionality  described  on  this  reference  page is aligned with the ISO C standard. Any conflict
       between the requirements described  here  and  the  ISO C  standard  is  unintentional.  This  volume  of
       POSIX.1‐2017 defers to the ISO C standard.

       These functions shall convert the initial portion of the wide-character string pointed to by nptr to long
       and longlong, respectively. First, they shall decompose the input string into three parts:

        1. An initial, possibly empty, sequence of white-space wide-character codes (as specified by iswspace())

        2. A  subject  sequence  interpreted  as an integer represented in some radix determined by the value of
           base

        3. A final wide-character string of  one  or  more  unrecognized  wide-character  codes,  including  the
           terminating null wide-character code of the input wide-character string

       Then they shall attempt to convert the subject sequence to an integer, and return the result.

       If base is 0, the expected form of the subject sequence is that of a decimal constant, octal constant, or
       hexadecimal constant, any of which may be preceded by a '+' or '-' sign. A decimal constant begins with a
       non-zero  digit,  and  consists of a sequence of decimal digits. An octal constant consists of the prefix
       '0' optionally followed by a sequence of the digits '0' to '7' only. A hexadecimal constant  consists  of
       the prefix 0x or 0X followed by a sequence of the decimal digits and letters 'a' (or 'A') to 'f' (or 'F')
       with values 10 to 15 respectively.

       If  the  value  of  base  is between 2 and 36, the expected form of the subject sequence is a sequence of
       letters and digits representing an integer with the radix specified by base, optionally preceded by a '+'
       or '-' sign, but not including an integer suffix. The letters from 'a' (or 'A') to 'z' (or 'Z') inclusive
       are ascribed the values 10 to 35; only letters whose ascribed values are less than that of base shall  be
       permitted. If the value of base is 16, the wide-character code representations of 0x or 0X may optionally
       precede the sequence of letters and digits, following the sign if present.

       The  subject  sequence  is defined as the longest initial subsequence of the input wide-character string,
       starting with the first non-white-space wide-character code that is of the  expected  form.  The  subject
       sequence  contains  no  wide-character  codes  if  the  input  wide-character string is empty or consists
       entirely of white-space wide-character code, or if the first non-white-space wide-character code is other
       than a sign or a permissible letter or digit.

       If the subject sequence has the expected form and  base  is  0,  the  sequence  of  wide-character  codes
       starting  with  the  first digit shall be interpreted as an integer constant. If the subject sequence has
       the expected form and the value of base is between 2 and 36, it shall be used as the base for conversion,
       ascribing to each letter its value as given above. If the subject sequence begins with a  <hyphen-minus>,
       the  value  resulting  from the conversion shall be negated. A pointer to the final wide-character string
       shall be stored in the object pointed to by endptr, provided that endptr is not a null pointer.

       In other than the C or POSIX locale, additional locale-specific subject sequence forms may be accepted.

       If the subject sequence is empty or does not have the expected form, no conversion  shall  be  performed;
       the  value of nptr shall be stored in the object pointed to by endptr, provided that endptr is not a null
       pointer.

       These functions shall not change the setting of errno if successful.

       Since 0, {LONG_MIN} or {LLONG_MIN} and {LONG_MAX} or {LLONG_MAX} are returned on error and are also valid
       returns on success, an application wishing to check for error situations should set errno to 0, then call
       wcstol() or wcstoll(), then check errno.

       These functions shall fail if:

       EINVAL The value of base is not supported.

       ERANGE The value to be returned is not representable.

       These functions may fail if:

       EINVAL No conversion could be performed.

       Thefollowingsectionsareinformative.

       None.

       None.

       wcstol, wcstoll — convert a wide-character string to a long integer

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

       None.

       Upon successful completion, these functions shall return the converted value, if any.  If  no  conversion
       could be performed, 0 shall be returned and errno may be set to indicate the error.  If the correct value
       is  outside  the range of representable values, {LONG_MIN}, {LONG_MAX}, {LLONG_MIN}, or {LLONG_MAX} shall
       be returned (according to the sign of the value), and errno set to [ERANGE].

fscanf(), iswalpha(), wcstod()

       The Base Definitions volume of POSIX.1‐2017, <wchar.h>

       #include <wchar.h>

       long wcstol(const wchar_t *restrict nptr, wchar_t **restrict endptr,
           int base);
       long long wcstoll(const wchar_t *restrict nptr,
           wchar_t **restrict endptr, int base);