OpenBSD-4.6/usr.bin/sup/src/errmsg.c

/*	$OpenBSD: errmsg.c,v 1.8 2002/02/16 21:27:54 millert Exp $	*/

/*
 * Copyright (c) 1991 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator   or   Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the rights
 * to redistribute these changes.
 */
/*****************************************************************
 * HISTORY
 * 04-Mar-85  Rudy Nedved (ern) at Carnegie-Mellon University
 *	Create a CMU version of the BBN errmsg routine from scratch. It
 *	differs from the BBN errmsg routine in the fact that it uses a
 *	negative value to indicate using the current errno value...the
 *	BBN uses a negative OR zero value.
 */

#include "supcdefs.h"
#include "supextern.h"

#ifndef HAS_STRERROR
static char *itoa(char *, unsigned int);

static char *itoa(p, n)
	char *p;
	unsigned int n;
{
	if (n >= 10)
		p = itoa(p, n/10);
	*p++ = (n % 10) + '0';
	return(p);
}
#endif

const char *errmsg(cod)
	int cod;
{
#ifndef HAS_STRERROR
	extern int	errno;
	extern int	sys_nerr;
	extern char	*sys_errlist[];
	static char unkmsg[] = "Unknown error ";
	static char unk[sizeof(unkmsg)+11];		/* trust us */

	if (cod < 0) cod = errno;

	if((cod >= 0) && (cod < sys_nerr))
	    return(sys_errlist[cod]);

	strlcpy(unk,unkmsg,sizeof unk);
	*itoa(&unk[sizeof(unkmsg)-1],cod) = '\0';

	return(unk);
#else
	return strerror(cod < 0 ? errno : cod);
#endif
}