declare variables extern and define only once (from ralph)

[unix-history] / usr / src / lib / libc / stdio / perror.c

/*
* Copyright (c) 1988, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)perror.c    8.1 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

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

       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 = strerror(errno);
       v->iov_len = strlen(v->iov_base);
       v++;
       v->iov_base = "\n";
       v->iov_len = 1;
       (void)writev(STDERR_FILENO, iov, (v - iov) + 1);
}