StdLib/LibC/Stdio/vswprintf.c

   1 /*
   2  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  19  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27   FreeBSD: src/lib/libc/stdio/vswprintf.c,v 1.6 2005/02/21 19:41:44 fjoe Exp
  28   NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp
  29  */
  30 #include  <LibConfig.h>
  31 #include  <sys/EfiCdefs.h>
  32
  33 #include  <errno.h>
  34 #include  <stdio.h>
  35 #include  <stdlib.h>
  36 #include  <wchar.h>
  37 #include  <stdarg.h>
  38 #include  "reentrant.h"
  39 #include  "local.h"
  40
  41 int
  42 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
  43     va_list ap)
  44 {
  45   static const mbstate_t initial = { 0 };
  46   mbstate_t mbs;
  47   FILE f;
  48   char *mbp;
  49   int ret, sverrno;
  50   size_t nwc;
  51   struct __sfileext fext;
  52
  53   if (n == 0) {
  54     errno = EINVAL;
  55     return (-1);
  56   }
  57
  58   _FILEEXT_SETUP(&f, &fext);
  59   f._file = -1;
  60   f._flags = __SWR | __SSTR | __SALC;
  61   f._bf._base = f._p = (unsigned char *)malloc(128);
  62   if (f._bf._base == NULL) {
  63     errno = ENOMEM;
  64     return (-1);
  65   }
  66   f._bf._size = f._w = 127;   /* Leave room for the NUL */
  67   ret = __vfwprintf_unlocked(&f, fmt, ap);
  68   if (ret < 0) {
  69     sverrno = errno;
  70     free(f._bf._base);
  71     errno = sverrno;
  72     return (-1);
  73   }
  74   *f._p = '\0';
  75   mbp = (char *)f._bf._base;
  76   /*
  77    * XXX Undo the conversion from wide characters to multibyte that
  78    * fputwc() did in __vfwprintf().
  79    */
  80   mbs = initial;
  81   nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs);
  82   free(f._bf._base);
  83   if (nwc == (size_t)-1) {
  84     errno = EILSEQ;
  85     return (-1);
  86   }
  87   if (nwc == n) {
  88     s[n - 1] = L'\0';
  89     errno = EOVERFLOW;
  90     return (-1);
  91   }
  92
  93   return (ret);
  94 }