4.3BSD-UWisc/src/lib/libc/gen/perror.c

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#if defined(LIBC_RCS) && !defined(lint)
static char rcs_id[] =
	"$Header: perror.c,v 1.3 86/09/08 14:44:15 tadl Exp $";
#endif
/*
 * RCS info
 *	$Locker:  $
 */
/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)perror.c	5.2 (Berkeley) 3/9/86";
#endif LIBC_SCCS and not lint

/*
 * Print the error indicated
 * in the cerror cell.
 */
#include <sys/types.h>
#include <sys/uio.h>

int	errno;
int	sys_nerr;
char	*sys_errlist[];
perror(s)
	char *s;
{
	struct iovec iov[4];
	register struct iovec *v = iov;

	if (s && *s) {
		v->iov_base = s;
		v->iov_len = strlen(s);
		v++;
		v->iov_base = ": ";
		v->iov_len = 2;
		v++;
	}
	v->iov_base = errno < sys_nerr ? sys_errlist[errno] : "Unknown error";
	v->iov_len = strlen(v->iov_base);
	v++;
	v->iov_base = "\n";
	v->iov_len = 1;
	writev(2, iov, (v - iov) + 1);
}