lib/libc/stdio/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  * Copyright (c) 2011 The FreeBSD Foundation
   8  * All rights reserved.
   9  * Portions of this software were developed by David Chisnall
  10  * under sponsorship from the FreeBSD Foundation.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  24  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  25  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  26  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  27  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * $FreeBSD: head/lib/libc/stdio/vswprintf.c 234531 2012-04-21 06:10:18Z das $
  35  */
  36
  37 #include <errno.h>
  38 #include <limits.h>
  39 #include <pthread.h> /* for FAKE_FILE PTHREAD_MUTEX_INITIALIZER */
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <wchar.h>
  43 #include "local.h"
  44 #include "xlocale_private.h"
  45
  46 int
  47 vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale,
  48                 const wchar_t * __restrict fmt, __va_list ap)
  49 {
  50         static const mbstate_t initial;
  51         mbstate_t mbs;
  52         FILE f = FAKE_FILE;
  53         char *mbp;
  54         int ret, sverrno;
  55         size_t nwc;
  56         FIX_LOCALE(locale);
  57
  58         if (n == 0) {
  59                 errno = EINVAL;
  60                 return (-1);
  61         }
  62         if (n - 1 > INT_MAX) {
  63                 errno = EOVERFLOW;
  64                 *s = L'\0';
  65                 return (-1);
  66         }
  67
  68         f.pub._flags = __SWR | __SSTR | __SALC;
  69         f._bf._base = f.pub._p = (unsigned char *)malloc(128);
  70         if (f._bf._base == NULL) {
  71                 errno = ENOMEM;
  72                 *s = L'\0';
  73                 return (-1);
  74         }
  75         f._bf._size = f.pub._w = 127;           /* Leave room for the NUL */
  76         ret = __vfwprintf(&f, locale, fmt, ap);
  77         if (ret < 0) {
  78                 sverrno = errno;
  79                 free(f._bf._base);
  80                 errno = sverrno;
  81                 *s = L'\0';
  82                 return (-1);
  83         }
  84         *f.pub._p = '\0';
  85         mbp = f._bf._base;
  86         /*
  87          * XXX Undo the conversion from wide characters to multibyte that
  88          * fputwc() did in __vfwprintf().
  89          */
  90         mbs = initial;
  91         nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale);
  92         free(f._bf._base);
  93         if (nwc == (size_t)-1) {
  94                 errno = EILSEQ;
  95                 *s = L'\0';
  96                 return (-1);
  97         }
  98         if (nwc == n) {
  99                 s[n - 1] = L'\0';
 100                 errno = EOVERFLOW;
 101                 return (-1);
 102         }
 103
 104         return (ret);
 105 }
 106 int
 107 vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
 108     __va_list ap)
 109 {
 110         return vswprintf_l(s, n, __get_locale(), fmt, ap);
 111 }