usr/src/lib/libc/port/locale/c32rtomb.c

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11
  12 /*
  13  * Copyright 2020 Robert Mustacchi
  14  */
  15
  16 /*
  17  * C11 c32rtomb(3C) support.
  18  *
  19  * The char32_t type is designed to represent a UTF-32 value, which is what we
  20  * can represent with a wchar_t. This is basically a wrapper around wcrtomb().
  21  */
  22
  23 #include <locale.h>
  24 #include <wchar.h>
  25 #include <xlocale.h>
  26 #include <uchar.h>
  27 #include <errno.h>
  28 #include "unicode.h"
  29
  30 static mbstate_t c32rtomb_state;
  31
  32 size_t
  33 c32rtomb(char *restrict str, char32_t c32, mbstate_t *restrict ps)
  34 {
  35         if ((c32 >= UNICODE_SUR_MIN && c32 <= UNICODE_SUR_MAX) ||
  36             c32 > UNICODE_SUP_MAX) {
  37                 errno = EILSEQ;
  38                 return ((size_t)-1);
  39         }
  40
  41         if (ps == NULL) {
  42                 ps = &c32rtomb_state;
  43         }
  44
  45         if (str == NULL) {
  46                 c32 = L'\0';
  47         }
  48
  49         return (wcrtomb_l(str, (wchar_t)c32, ps, uselocale((locale_t)0)));
  50 }