lib/libc/stdio/vswprintf.c

   1 /*      $NetBSD: vswprintf.c,v 1.3 2012/03/15 18:22:31 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 1.3 2012/03/15 18:22:31 christos Exp $");
  36 #endif
  37 #endif /* LIBC_SCCS and not lint */
  38
  39 #include <errno.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <wchar.h>
  43 #include <stdarg.h>
  44 #include "reentrant.h"
  45 #include "local.h"
  46
  47 int
  48 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
  49     va_list ap)
  50 {
  51         static const mbstate_t initial;
  52         mbstate_t mbs;
  53         FILE f;
  54         char *mbp;
  55         int ret, sverrno;
  56         size_t nwc;
  57         struct __sfileext fext;
  58
  59         if (n == 0) {
  60                 errno = EINVAL;
  61                 return -1;
  62         }
  63
  64         _FILEEXT_SETUP(&f, &fext);
  65         f._file = -1;
  66         f._flags = __SWR | __SSTR | __SALC;
  67         f._bf._base = f._p = (unsigned char *)malloc(128);
  68         if (f._bf._base == NULL) {
  69                 errno = ENOMEM;
  70                 return -1;
  71         }
  72         f._bf._size = f._w = 127;               /* Leave room for the NUL */
  73         ret = __vfwprintf_unlocked(&f, fmt, ap);
  74         if (ret < 0) {
  75                 sverrno = errno;
  76                 free(f._bf._base);
  77                 errno = sverrno;
  78                 return -1;
  79         }
  80         *f._p = '\0';
  81         mbp = (char *)f._bf._base;
  82         /*
  83          * XXX Undo the conversion from wide characters to multibyte that
  84          * fputwc() did in __vfwprintf().
  85          */
  86         mbs = initial;
  87         nwc = mbsrtowcs(s, (void *)&mbp, n, &mbs);
  88         free(f._bf._base);
  89         if (nwc == (size_t)-1) {
  90                 errno = EILSEQ;
  91                 return -1;
  92         }
  93         if (nwc == n) {
  94                 s[n - 1] = L'\0';
  95                 errno = EOVERFLOW;
  96                 return -1;
  97         }
  98
  99         return ret;
 100 }