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[mirror_edk2.git] / StdLib / LibC / Stdio / vsnprintf.c

/*  $NetBSD: vsnprintf.c,v 1.20 2005/02/09 21:35:47 kleink Exp $  */\r
\r
/*-\r
 * Copyright (c) 1990, 1993\r
 *  The Regents of the University of California.  All rights reserved.\r
 *\r
 * This code is derived from software contributed to Berkeley by\r
 * Chris Torek.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 * 3. Neither the name of the University nor the names of its contributors\r
 *    may be used to endorse or promote products derived from this software\r
 *    without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
 * SUCH DAMAGE.\r
 */\r
#include  <LibConfig.h>\r
#include <sys/EfiCdefs.h>\r
#if defined(LIBC_SCCS) && !defined(lint)\r
#if 0\r
static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";\r
#else\r
__RCSID("$NetBSD: vsnprintf.c,v 1.20 2005/02/09 21:35:47 kleink Exp $");\r
#endif\r
#endif /* LIBC_SCCS and not lint */\r
\r
#include "namespace.h"\r
\r
#include <assert.h>\r
#include <errno.h>\r
#include <stdio.h>\r
#include "reentrant.h"\r
#include "local.h"\r
\r
#ifdef __weak_alias\r
__weak_alias(vsnprintf,_vsnprintf)\r
#endif\r
\r
int\r
vsnprintf(char *str, size_t n, const char *fmt, va_list ap)\r
{\r
  int ret;\r
  FILE f;\r
  struct __sfileext fext;\r
  unsigned char dummy[1];\r
\r
  _DIAGASSERT(n == 0 || str != NULL);\r
  _DIAGASSERT(fmt != NULL);\r
\r
  if ((int)n < 0) {\r
    errno = EINVAL;\r
    return (-1);\r
  }\r
\r
  _FILEEXT_SETUP(&f, &fext);\r
  f._file = -1;\r
  f._flags = __SWR | __SSTR;\r
  if (n == 0) {\r
    f._bf._base = f._p = dummy;\r
    f._bf._size = f._w = 0;\r
  } else {\r
    f._bf._base = f._p = (unsigned char *)str;\r
    f._bf._size = f._w = (int)(n - 1);\r
  }\r
  ret = __vfprintf_unlocked(&f, fmt, ap);\r
  *f._p = 0;\r
  return (ret);\r
}\r