1LOCALECONV(3P) POSIX Programmer's Manual LOCALECONV(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
12 localeconv — return locale-specific information
13
15 #include <locale.h>
16 struct lconv *localeconv(void);
18
20 The functionality described on this reference page is aligned with the
21 ISO C standard. Any conflict between the requirements described here
22 and the ISO C standard is unintentional. This volume of POSIX.1‐2017
23 defers to the ISO C standard.
24 The localeconv() function shall set the components of an object with
26 the type struct lconv with the values appropriate for the formatting of
27 numeric quantities (monetary and otherwise) according to the rules of
28 the current locale.
29 The members of the structure with type char * are pointers to strings,
31 any of which (except decimal_point) can point to "", to indicate that
32 the value is not available in the current locale or is of zero length.
33 The members with type char are non-negative numbers, any of which can
34 be {CHAR_MAX} to indicate that the value is not available in the cur‐
35 rent locale.
36 The members include the following:
38 char *decimal_point
40 The radix character used to format non-monetary quantities.
41 char *thousands_sep
43 The character used to separate groups of digits before the deci‐
44 mal-point character in formatted non-monetary quantities.
45 char *grouping
47 A string whose elements taken as one-byte integer values indicate
48 the size of each group of digits in formatted non-monetary quan‐
49 tities.
50 char *int_curr_symbol
52 The international currency symbol applicable to the current
53 locale. The first three characters contain the alphabetic inter‐
54 national currency symbol in accordance with those specified in
55 the ISO 4217:2001 standard. The fourth character (immediately
56 preceding the null byte) is the character used to separate the
57 international currency symbol from the monetary quantity.
58 char *currency_symbol
60 The local currency symbol applicable to the current locale.
61 char *mon_decimal_point
63 The radix character used to format monetary quantities.
64 char *mon_thousands_sep
66 The separator for groups of digits before the decimal-point in
67 formatted monetary quantities.
68 char *mon_grouping
70 A string whose elements taken as one-byte integer values indicate
71 the size of each group of digits in formatted monetary quanti‐
72 ties.
73 char *positive_sign
75 The string used to indicate a non-negative valued formatted mone‐
76 tary quantity.
77 char *negative_sign
79 The string used to indicate a negative valued formatted monetary
80 quantity.
81 char int_frac_digits
83 The number of fractional digits (those after the decimal-point)
84 to be displayed in an internationally formatted monetary quan‐
85 tity.
86 char frac_digits
88 The number of fractional digits (those after the decimal-point)
89 to be displayed in a formatted monetary quantity.
90 char p_cs_precedes
92 Set to 1 if the currency_symbol precedes the value for a non-neg‐
93 ative formatted monetary quantity. Set to 0 if the symbol suc‐
94 ceeds the value.
95 char p_sep_by_space
97 Set to a value indicating the separation of the currency_symbol,
98 the sign string, and the value for a non-negative formatted mone‐
99 tary quantity.
100 char n_cs_precedes
102 Set to 1 if the currency_symbol precedes the value for a negative
103 formatted monetary quantity. Set to 0 if the symbol succeeds the
104 value.
105 char n_sep_by_space
107 Set to a value indicating the separation of the currency_symbol,
108 the sign string, and the value for a negative formatted monetary
109 quantity.
110 char p_sign_posn
112 Set to a value indicating the positioning of the positive_sign
113 for a non-negative formatted monetary quantity.
114 char n_sign_posn
116 Set to a value indicating the positioning of the negative_sign
117 for a negative formatted monetary quantity.
118 char int_p_cs_precedes
120 Set to 1 or 0 if the int_curr_symbol respectively precedes or
121 succeeds the value for a non-negative internationally formatted
122 monetary quantity.
123 char int_n_cs_precedes
125 Set to 1 or 0 if the int_curr_symbol respectively precedes or
126 succeeds the value for a negative internationally formatted mone‐
127 tary quantity.
128 char int_p_sep_by_space
130 Set to a value indicating the separation of the int_curr_symbol,
131 the sign string, and the value for a non-negative internationally
132 formatted monetary quantity.
133 char int_n_sep_by_space
135 Set to a value indicating the separation of the int_curr_symbol,
136 the sign string, and the value for a negative internationally
137 formatted monetary quantity.
138 char int_p_sign_posn
140 Set to a value indicating the positioning of the positive_sign
141 for a non-negative internationally formatted monetary quantity.
142 char int_n_sign_posn
144 Set to a value indicating the positioning of the negative_sign
145 for a negative internationally formatted monetary quantity.
146 The elements of grouping and mon_grouping are interpreted according to
148 the following:
149 {CHAR_MAX} No further grouping is to be performed.
151 0 The previous element is to be repeatedly used for the
153 remainder of the digits.
154 other The integer value is the number of digits that comprise the
156 current group. The next element is examined to determine
157 the size of the next group of digits before the current
158 group.
159 The values of p_sep_by_space, n_sep_by_space, int_p_sep_by_space, and
161 int_n_sep_by_space are interpreted according to the following:
162 0 No space separates the currency symbol and value.
164 1 If the currency symbol and sign string are adjacent, a space sep‐
166 arates them from the value; otherwise, a space separates the cur‐
167 rency symbol from the value.
168 2 If the currency symbol and sign string are adjacent, a space sep‐
170 arates them; otherwise, a space separates the sign string from
171 the value.
172 For int_p_sep_by_space and int_n_sep_by_space, the fourth character of
174 int_curr_symbol is used instead of a space.
175 The values of p_sign_posn, n_sign_posn, int_p_sign_posn, and
177 int_n_sign_posn are interpreted according to the following:
178 0 Parentheses surround the quantity and currency_symbol or
180 int_curr_symbol.
181 1 The sign string precedes the quantity and currency_symbol or
183 int_curr_symbol.
184 2 The sign string succeeds the quantity and currency_symbol or
186 int_curr_symbol.
187 3 The sign string immediately precedes the currency_symbol or
189 int_curr_symbol.
190 4 The sign string immediately succeeds the currency_symbol or
192 int_curr_symbol.
193 The implementation shall behave as if no function in this volume of
195 POSIX.1‐2017 calls localeconv().
196 The localeconv() function need not be thread-safe.
198
200 The localeconv() function shall return a pointer to the filled-in
201 object. The application shall not modify the structure to which the
202 return value points, nor any storage areas pointed to by pointers
203 within the structure. The returned pointer, and pointers within the
204 structure, might be invalidated or the structure or the storage areas
205 might be overwritten by a subsequent call to localeconv(). In addi‐
206 tion, the returned pointer, and pointers within the structure, might be
207 invalidated or the structure or the storage areas might be overwritten
208 by subsequent calls to setlocale() with the categories LC_ALL, LC_MONE‐
209 TARY, or LC_NUMERIC, or by calls to uselocale() which change the cate‐
210 gories LC_MONETARY or LC_NUMERIC. The returned pointer, pointers within
211 the structure, the structure, and the storage areas might also be
212 invalidated if the calling thread is terminated.
213
215 No errors are defined.
216 The following sections are informative.
218
220 None.
221
223 The following table illustrates the rules which may be used by four
224 countries to format monetary quantities.
225 ┌────────────┬─────────────────┬─────────────────┬──────────────────────┐
227 │ Country │ Positive Format │ Negative Format │ International Format │
228 ├────────────┼─────────────────┼─────────────────┼──────────────────────┤
229 │Italy │ €.1.230 │ -€.1.230 │ EUR.1.230 │
230 │Netherlands │ € 1.234,56 │ € -1.234,56 │ EUR 1.234,56 │
231 │Norway │ kr1.234,56 │ kr1.234,56- │ NOK 1.234,56 │
232 │Switzerland │ SFrs.1,234.56 │ SFrs.1,234.56C │ CHF 1,234.56 │
233 └────────────┴─────────────────┴─────────────────┴──────────────────────┘
234 For these four countries, the respective values for the monetary mem‐
235 bers of the structure returned by localeconv() are:
236 ┌───────────────────┬────────┬─────────────┬────────┬─────────────┐
238 │ │ Italy │ Netherlands │ Norway │ Switzerland │
239 ├───────────────────┼────────┼─────────────┼────────┼─────────────┤
240 │int_curr_symbol │ "EUR." │ "EUR " │ "NOK " │ "CHF " │
241 │currency_symbol │ "€." │ "€" │ "kr" │ "SFrs." │
242 │mon_decimal_point │ "" │ "," │ "," │ "." │
243 │mon_thousands_sep │ "." │ "." │ "." │ "," │
244 │mon_grouping │ "\3" │ "\3" │ "\3" │ "\3" │
245 │positive_sign │ "" │ "" │ "" │ "" │
246 │negative_sign │ "-" │ "-" │ "-" │ "C" │
247 │int_frac_digits │ 0 │ 2 │ 2 │ 2 │
248 │frac_digits │ 0 │ 2 │ 2 │ 2 │
249 │p_cs_precedes │ 1 │ 1 │ 1 │ 1 │
250 │p_sep_by_space │ 0 │ 1 │ 0 │ 0 │
251 │n_cs_precedes │ 1 │ 1 │ 1 │ 1 │
252 │n_sep_by_space │ 0 │ 1 │ 0 │ 0 │
253 │p_sign_posn │ 1 │ 1 │ 1 │ 1 │
254 │n_sign_posn │ 1 │ 4 │ 2 │ 2 │
255 │int_p_cs_precedes │ 1 │ 1 │ 1 │ 1 │
256 │int_n_cs_precedes │ 1 │ 1 │ 1 │ 1 │
257 │int_p_sep_by_space │ 0 │ 0 │ 0 │ 0 │
258 │int_n_sep_by_space │ 0 │ 0 │ 0 │ 0 │
259 │int_p_sign_posn │ 1 │ 1 │ 1 │ 1 │
260 │int_n_sign_posn │ 1 │ 4 │ 4 │ 2 │
261 └───────────────────┴────────┴─────────────┴────────┴─────────────┘
263 None.
264
266 None.
267
269 fprintf(), fscanf(), isalpha(), isascii(), nl_langinfo(), setlocale(),
270 strcat(), strchr(), strcmp(), strcoll(), strcpy(), strftime(),
271 strlen(), strpbrk(), strspn(), strtok(), strxfrm(), strtod(), uselo‐
272 cale()
273 The Base Definitions volume of POSIX.1‐2017, <langinfo.h>, <locale.h>
275
277 Portions of this text are reprinted and reproduced in electronic form
278 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
279 table Operating System Interface (POSIX), The Open Group Base Specifi‐
280 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
281 Electrical and Electronics Engineers, Inc and The Open Group. In the
282 event of any discrepancy between this version and the original IEEE and
283 The Open Group Standard, the original IEEE and The Open Group Standard
284 is the referee document. The original Standard can be obtained online
285 at http://www.opengroup.org/unix/online.html .
286 Any typographical or formatting errors that appear in this page are
288 most likely to have been introduced during the conversion of the source
289 files to man page format. To report such errors, see https://www.ker‐
290 nel.org/doc/man-pages/reporting_bugs.html .
291IEEE/The Open Group 2017 LOCALECONV(3P)