/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>

/*
 * Since perror() is not allowed to change the contents of strerror()'s
 * static buffer, both functions supply their own buffers to the
 * internal function __strerror().
 */

static __inline__ char *itoa(int);
static const char *__strerror(const int,char*);

#ifdef NLS
#define catclose	_catclose
#define catgets		_catgets
#define catopen		_catopen
#include <nl_types.h>
#endif

#define sys_errlist	_sys_errlist
#define sys_nerr	_sys_nerr

	static __inline__ char *
itoa(int num)
{
 static char buffer[11];
 char *p = buffer + 4;

	while (num >= 10) {
		*--p = (num % 10) + '0';
		num /= 10;
	}
	*p = (num % 10) + '0';
	return p;
}

/*
 * Since perror() is not allowed to change the contents of strerror()'s
 * static buffer, both functions supply their own buffers to the
 * internal function __strerror().
 */

	static const char *
__strerror(int num, char *buf)
{
#define	UPREFIX	"Unknown error: "
#ifdef NLS
	nl_catd catd;
	catd = catopen("libc", 0);
#endif

	if (num < sys_nerr) {
#ifdef NLS
		strncpy(buf, catgets(catd, 1, num,
		    (char*)_sys_errlist[num]), NL_TEXTMAX-1);
		buf[NL_TEXTMAX - 1] = '\0';
#else
		return(_sys_errlist[num]);
#endif
	} else {
#ifdef NLS
		strncpy(buf, catgets(catd, 1, 0xffff, UPREFIX), NL_TEXTMAX-1);
		buf[NL_TEXTMAX - 1] = '\0';
#else
		strcpy(buf, UPREFIX);
#endif
		strncat(buf, itoa(num), NL_TEXTMAX-strlen(buf)-1);
	}

#ifdef NLS
	catclose(catd);
#endif

	return buf;
}

	extern char *
strerror(int num)
{
 static char buf[NL_TEXTMAX];
	return (char*)__strerror(num, buf);
}

	extern void
perror(const char *s)
{
	register struct iovec *v;
	struct iovec iov[4];
	char buf[NL_TEXTMAX];

	v = iov;
	if (s && *s) {
		v->iov_base = (char*)s;
		v->iov_len = strlen(s);
		v++;
		v->iov_base = ": ";
		v->iov_len = 2;
		v++;
	}
	v->iov_base = (char*)__strerror(errno, buf);
	v->iov_len = strlen(v->iov_base);
	v++;
	v->iov_base = "\n";
	v->iov_len = 1;
	(void)writev(STDERR_FILENO, iov, (v - iov) + 1);
}

