/*	$NetBSD: vsnprintf.c,v 1.29 2017/01/12 18:16:52 christos Exp $	*/

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <assert.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include "reentrant.h"
#include "setlocale_local.h"
#include "local.h"

int vsnprintf_l(char *str, size_t n, locale_t loc, const char *fmt,
                va_list ap) {
  int ret;
  FILE f;
  struct __sfileext fext;
  unsigned char dummy[1];

  _DIAGASSERT(n == 0 || str != NULL);
  _DIAGASSERT(fmt != NULL);

  if (n > INT_MAX) {
    errno = EOVERFLOW;
    return -1;
  }

  _FILEEXT_SETUP(&f, &fext);
  f._file = -1;
  f._flags = __SWR | __SSTR;
  if (n == 0) {
    f._bf._base = f._p = dummy;
    f._bf._size = f._w = 0;
  } else {
    f._bf._base = f._p = (unsigned char *)str;
    _DIAGASSERT(__type_fit(int, n - 1));
    f._bf._size = f._w = (int)(n - 1);
  }
  ret = __vfprintf_unlocked_l(&f, loc, fmt, ap);
  *f._p = 0;
  return ret;
}

int vsnprintf(char *str, size_t n, const char *fmt, va_list ap) {
  return vsnprintf_l(str, n, _current_locale(), fmt, ap);
}

int snprintf(char *str, size_t n, const char *fmt, ...) {
  va_list ap;
  int ret;

  va_start(ap, fmt);
  ret = vsnprintf(str, n, fmt, ap);
  va_end(ap);
  return ret;
}

int snprintf_l(char *str, size_t n, locale_t loc, const char *fmt, ...) {
  va_list ap;
  int ret;

  va_start(ap, fmt);
  ret = vsnprintf_l(str, n, loc, fmt, ap);
  va_end(ap);
  return ret;
}
