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 1.5 2004/04/07 09:55:05 tjr Exp $");
  35
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <wchar.h>
  40 #include "local.h"
  41
  42 int
  43 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
  44     __va_list ap)
  45 {
  46         static const mbstate_t initial;
  47         mbstate_t mbs;
  48         FILE f;
  49         struct __sFILEX ext;
  50         char *mbp;
  51         int ret, sverrno;
  52
  53         if (n == 0) {
  54                 errno = EINVAL;
  55                 return (-1);
  56         }
  57
  58         f._file = -1;
  59         f._flags = __SWR | __SSTR | __SALC;
  60         f._bf._base = f._p = (unsigned char *)malloc(128);
  61         if (f._bf._base == NULL) {
  62                 errno = ENOMEM;
  63                 return (-1);
  64         }
  65         f._bf._size = f._w = 127;               /* Leave room for the NUL */
  66         f._extra = &ext;
  67         INITEXTRA(&f);
  68         ret = __vfwprintf(&f, fmt, ap);
  69         if (ret < 0) {
  70                 sverrno = errno;
  71                 free(f._bf._base);
  72                 errno = sverrno;
  73                 return (-1);
  74         }
  75         *f._p = '\0';
  76         mbp = f._bf._base;
  77         /*
  78          * XXX Undo the conversion from wide characters to multibyte that
  79          * fputwc() did in __vfwprintf().
  80          */
  81         mbs = initial;
  82         if (mbsrtowcs(s, (const char **)&mbp, n, &mbs) == (size_t)-1) {
  83                 free(f._bf._base);
  84                 errno = EILSEQ;
  85                 return (-1);
  86         }
  87         free(f._bf._base);
  88         if (s[n - 1] != L'\0') {
  89                 s[n - 1] = L'\0';
  90                 errno = EOVERFLOW;
  91                 return (-1);
  92         }
  93
  94         return (ret);
  95 }