LOCALECONV(3)              POSIX Programmer's Manual             LOCALECONV(3)



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

NAME
       localeconv -- return locale-specific information

SYNOPSIS
       #include <locale.h>

       struct lconv *localeconv(void);

DESCRIPTION
       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.

       The localeconv() function shall set the components of an object with
       the type struct lconv with the values appropriate for the formatting of
       numeric quantities (monetary and otherwise) according to the rules of
       the current locale.

       The members of the structure with type char ** are pointers to strings,
       any of which (except decimal_point) can point to """", to indicate that
       the value is not available in the current locale or is of zero length.
       The members with type char are non-negative numbers, any of which can
       be {CHAR_MAX} to indicate that the value is not available in the
       current locale.

       The members include the following:

       char *decimal_point
             The radix character used to format non-monetary quantities.

       char *thousands_sep
             The character used to separate groups of digits before the
             decimal-point character in formatted non-monetary quantities.

       char *grouping
             A string whose elements taken as one-byte integer values indicate
             the size of each group of digits in formatted non-monetary
             quantities.

       char *int_curr_symbol
             The international currency symbol applicable to the current
             locale.  The first three characters contain the alphabetic
             international currency symbol in accordance with those specified
             in the ISO 4217:2001 standard. The fourth character (immediately
             preceding the null byte) is the character used to separate the
             international currency symbol from the monetary quantity.

       char *currency_symbol
             The local currency symbol applicable to the current locale.

       char *mon_decimal_point
             The radix character used to format monetary quantities.

       char *mon_thousands_sep
             The separator for groups of digits before the decimal-point in
             formatted monetary quantities.

       char *mon_grouping
             A string whose elements taken as one-byte integer values indicate
             the size of each group of digits in formatted monetary
             quantities.

       char *positive_sign
             The string used to indicate a non-negative valued formatted
             monetary quantity.

       char *negative_sign
             The string used to indicate a negative valued formatted monetary
             quantity.

       char int_frac_digits
             The number of fractional digits (those after the decimal-point)
             to be displayed in an internationally formatted monetary
             quantity.

       char frac_digits
             The number of fractional digits (those after the decimal-point)
             to be displayed in a formatted monetary quantity.

       char p_cs_precedes
             Set to 1 if the currency_symbol precedes the value for a non-
             negative formatted monetary quantity. Set to 0 if the symbol
             succeeds the value.

       char p_sep_by_space
             Set to a value indicating the separation of the currency_symbol,
             the sign string, and the value for a non-negative formatted
             monetary quantity.

       char n_cs_precedes
             Set to 1 if the currency_symbol precedes the value for a negative
             formatted monetary quantity. Set to 0 if the symbol succeeds the
             value.

       char n_sep_by_space
             Set to a value indicating the separation of the currency_symbol,
             the sign string, and the value for a negative formatted monetary
             quantity.

       char p_sign_posn
             Set to a value indicating the positioning of the positive_sign
             for a non-negative formatted monetary quantity.

       char n_sign_posn
             Set to a value indicating the positioning of the negative_sign
             for a negative formatted monetary quantity.

       char int_p_cs_precedes
             Set to 1 or 0 if the int_curr_symbol respectively precedes or
             succeeds the value for a non-negative internationally formatted
             monetary quantity.

       char int_n_cs_precedes
             Set to 1 or 0 if the int_curr_symbol respectively precedes or
             succeeds the value for a negative internationally formatted
             monetary quantity.

       char int_p_sep_by_space
             Set to a value indicating the separation of the int_curr_symbol,
             the sign string, and the value for a non-negative internationally
             formatted monetary quantity.

       char int_n_sep_by_space
             Set to a value indicating the separation of the int_curr_symbol,
             the sign string, and the value for a negative internationally
             formatted monetary quantity.

       char int_p_sign_posn
             Set to a value indicating the positioning of the positive_sign
             for a non-negative internationally formatted monetary quantity.

       char int_n_sign_posn
             Set to a value indicating the positioning of the negative_sign
             for a negative internationally formatted monetary quantity.

       The elements of grouping and mon_grouping are interpreted according to
       the following:

       {CHAR_MAX}  No further grouping is to be performed.

       0           The previous element is to be repeatedly used for the
                   remainder of the digits.

       other       The integer value is the number of digits that comprise the
                   current group. The next element is examined to determine
                   the size of the next group of digits before the current
                   group.

       The values of p_sep_by_space, n_sep_by_space, int_p_sep_by_space, and
       int_n_sep_by_space are interpreted according to the following:

       0     No space separates the currency symbol and value.

       1     If the currency symbol and sign string are adjacent, a space
             separates them from the value; otherwise, a space separates the
             currency symbol from the value.

       2     If the currency symbol and sign string are adjacent, a space
             separates them; otherwise, a space separates the sign string from
             the value.

       For int_p_sep_by_space and int_n_sep_by_space, the fourth character of
       int_curr_symbol is used instead of a space.

       The values of p_sign_posn, n_sign_posn, int_p_sign_posn, and
       int_n_sign_posn are interpreted according to the following:

       0     Parentheses surround the quantity and currency_symbol or
             int_curr_symbol.

       1     The sign string precedes the quantity and currency_symbol or
             int_curr_symbol.

       2     The sign string succeeds the quantity and currency_symbol or
             int_curr_symbol.

       3     The sign string immediately precedes the currency_symbol or
             int_curr_symbol.

       4     The sign string immediately succeeds the currency_symbol or
             int_curr_symbol.

       The implementation shall behave as if no function in this volume of
       POSIX.1-2017 calls localeconv().

       The localeconv() function need not be thread-safe.

RETURN VALUE
       The localeconv() function shall return a pointer to the filled-in
       object. The application shall not modify the structure to which the
       return value points, nor any storage areas pointed to by pointers
       within the structure. The returned pointer, and pointers within the
       structure, might be invalidated or the structure or the storage areas
       might be overwritten by a subsequent call to localeconv().  In
       addition, the returned pointer, and pointers within the structure,
       might be invalidated or the structure or the storage areas might be
       overwritten by subsequent calls to setlocale() with the categories
       LC_ALL, LC_MONETARY, or LC_NUMERIC, or by calls to uselocale() which
       change the categories LC_MONETARY or LC_NUMERIC. The returned pointer,
       pointers within the structure, the structure, and the storage areas
       might also be invalidated if the calling thread is terminated.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The following table illustrates the rules which may be used by four
       countries to format monetary quantities.

       +------------+-----------------+-----------------+----------------------+
       |  Country   | Positive Format | Negative Format | International Format |
       +------------+-----------------+-----------------+----------------------+
       |Italy       | EUR.1.230       | -EUR.1.230      | EUR.1.230            |
       |Netherlands | EUR 1.234,56    | EUR -1.234,56   | EUR 1.234,56         |
       |Norway      | kr1.234,56      | kr1.234,56-     | NOK 1.234,56         |
       |Switzerland | SFrs.1,234.56   | SFrs.1,234.56C  | CHF 1,234.56         |
       +------------+-----------------+-----------------+----------------------+
       For these four countries, the respective values for the monetary
       members of the structure returned by localeconv() are:

         +-------------------+--------+-------------+--------+-------------+
         |                   | Italy  | Netherlands | Norway | Switzerland |
         +-------------------+--------+-------------+--------+-------------+
         |int_curr_symbol    | "EUR." |   "EUR "    | "NOK " |   "CHF "    |
         |currency_symbol    | "EUR." |    "EUR"    |  "kr"  |   "SFrs."   |
         |mon_decimal_point  |   ""   |     ","     |  ","   |     "."     |
         |mon_thousands_sep  |  "."   |     "."     |  "."   |     ","     |
         |mon_grouping       |  "\3"  |    "\3"     |  "\3"  |    "\3"     |
         |positive_sign      |   ""   |     ""      |   ""   |     ""      |
         |negative_sign      |  "-"   |     "-"     |  "-"   |     "C"     |
         |int_frac_digits    |   0    |      2      |   2    |      2      |
         |frac_digits        |   0    |      2      |   2    |      2      |
         |p_cs_precedes      |   1    |      1      |   1    |      1      |
         |p_sep_by_space     |   0    |      1      |   0    |      0      |
         |n_cs_precedes      |   1    |      1      |   1    |      1      |
         |n_sep_by_space     |   0    |      1      |   0    |      0      |
         |p_sign_posn        |   1    |      1      |   1    |      1      |
         |n_sign_posn        |   1    |      4      |   2    |      2      |
         |int_p_cs_precedes  |   1    |      1      |   1    |      1      |
         |int_n_cs_precedes  |   1    |      1      |   1    |      1      |
         |int_p_sep_by_space |   0    |      0      |   0    |      0      |
         |int_n_sep_by_space |   0    |      0      |   0    |      0      |
         |int_p_sign_posn    |   1    |      1      |   1    |      1      |
         |int_n_sign_posn    |   1    |      4      |   4    |      2      |
         +-------------------+--------+-------------+--------+-------------+
RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fprintf(), fscanf(), isalpha(), isascii(), nl__langinfo(), setlocale(),
       strcat(), strchr(), strcmp(), strcoll(), strcpy(), strftime(),
       strlen(), strpbrk(), strspn(), strtok(), strxfrm(), strtod(),
       uselocale()

       The Base Definitions volume of POSIX.1-2017, <langinfo.h>, <locale.h>

COPYRIGHT
       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                        LOCALECONV(3)
