lib/libc/stdio/vswprintf.c

   1 /*      $NetBSD: vswprintf.c,v 1.6 2013/05/19 21:45:00 christos 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 defined(LIBC_SCCS) && !defined(lint)
  32 #if 0
  33 __FBSDID("$FreeBSD: src/lib/libc/stdio/vswprintf.c,v 1.6 2005/02/21 19:41:44 fjoe Exp $");
  34 #else
  35 __RCSID("$NetBSD: vswprintf.c,v 1.6 2013/05/19 21:45:00 christos Exp $");
  36 #endif
  37 #endif /* LIBC_SCCS and not lint */
  38
  39 #include "namespace.h"
  40 #include <errno.h>
  41 #include <locale.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <wchar.h>
  45 #include <stdarg.h>
  46
  47 #include "reentrant.h"
  48 #include "setlocale_local.h"
  49 #include "local.h"
  50
  51 __weak_alias(vswprintf_l, _vswprintf_l)
  52
  53 int
  54 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t loc,
  55     const wchar_t * __restrict fmt, va_list ap)
  56 {
  57         static const mbstate_t initial;
  58         mbstate_t mbs;
  59         FILE f;
  60         char *mbp;
  61         int ret, sverrno;
  62         size_t nwc;
  63         struct __sfileext fext;
  64
  65         if (n == 0) {
  66                 errno = EINVAL;
  67                 return -1;
  68         }
  69
  70         _FILEEXT_SETUP(&f, &fext);
  71         f._file = -1;
  72         f._flags = __SWR | __SSTR | __SALC;
  73         f._bf._base = f._p = malloc(128);
  74         if (f._bf._base == NULL) {
  75                 errno = ENOMEM;
  76                 return -1;
  77         }
  78         f._bf._size = f._w = 127;               /* Leave room for the NUL */
  79         ret = __vfwprintf_unlocked_l(&f, loc, fmt, ap);
  80         if (ret < 0) {
  81                 sverrno = errno;
  82                 free(f._bf._base);
  83                 errno = sverrno;
  84                 return -1;
  85         }
  86         *f._p = '\0';
  87         mbp = (char *)f._bf._base;
  88         /*
  89          * XXX Undo the conversion from wide characters to multibyte that
  90          * fputwc() did in __vfwprintf().
  91          */
  92         mbs = initial;
  93         nwc = mbsrtowcs_l(s, (void *)&mbp, n, &mbs, loc);
  94         free(f._bf._base);
  95         if (nwc == (size_t)-1) {
  96                 errno = EILSEQ;
  97                 return -1;
  98         }
  99         if (nwc == n) {
 100                 s[n - 1] = L'\0';
 101                 errno = EOVERFLOW;
 102                 return -1;
 103         }
 104
 105         return ret;
 106 }
 107
 108 int
 109 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
 110     va_list ap)
 111 {
 112         return vswprintf_l(s, n, _current_locale(), fmt, ap);
 113 }