stdio/FreeBSD/vswprintf.c

   1 /*      $OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $   */
   2
   3 /*
   4  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  21  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #if 0
  32 __FBSDID("FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.16 2002/08/21 16:19:57 mike Exp ");
  33 #endif
  34 __FBSDID("$FreeBSD: src/lib/libc/stdio/vswprintf.c,v 1.7 2008/04/17 22:17:54 jhb Exp $");
  35
  36 #include "xlocale_private.h"
  37
  38 #include <errno.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <wchar.h>
  42 #include "local.h"
  43
  44 int
  45 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t loc,
  46     const wchar_t * __restrict fmt, __va_list ap)
  47 {
  48         static const mbstate_t initial;
  49         mbstate_t mbs;
  50         FILE f;
  51         char *mbp;
  52         int ret, sverrno;
  53         size_t nwc;
  54         struct __sFILEX ext;
  55         f._extra = &ext;
  56         INITEXTRA(&f);
  57
  58         NORMALIZE_LOCALE(loc);
  59         if (n == 0) {
  60                 errno = EINVAL;
  61                 return (-1);
  62         }
  63
  64         f._file = -1;
  65         f._flags = __SWR | __SSTR | __SALC;
  66         f._bf._base = f._p = (unsigned char *)malloc(128);
  67         if (f._bf._base == NULL) {
  68                 errno = ENOMEM;
  69                 return (-1);
  70         }
  71         f._bf._size = f._w = 127;               /* Leave room for the NUL */
  72         f._orientation = 0;
  73         memset(&f._mbstate, 0, sizeof(mbstate_t));
  74         ret = __vfwprintf(&f, loc, fmt, ap);
  75         if (ret < 0) {
  76                 sverrno = errno;
  77                 free(f._bf._base);
  78                 errno = sverrno;
  79                 return (-1);
  80         }
  81         *f._p = '\0';
  82         mbp = f._bf._base;
  83         /*
  84          * XXX Undo the conversion from wide characters to multibyte that
  85          * fputwc() did in __vfwprintf().
  86          */
  87         mbs = initial;
  88         nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, loc);
  89         free(f._bf._base);
  90         if (nwc == (size_t)-1) {
  91                 errno = EILSEQ;
  92                 return (-1);
  93         }
  94         if (nwc == n) {
  95                 s[n - 1] = L'\0';
  96                 errno = EOVERFLOW;
  97                 return (-1);
  98         }
  99
 100         return (ret);
 101 }
 102
 103 int
 104 vswprintf(wchar_t * __restrict s, size_t n,
 105     const wchar_t * __restrict fmt, __va_list ap)
 106 {
 107         return vswprintf_l(s, n, __current_locale(), fmt, ap);
 108 }