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/*
* error.c -- main error handling routines
*
* $Id: error.c,v 1.3 2002/07/02 22:09:14 kenh Exp $
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#ifdef HAVE_WRITEV
# include <sys/types.h>
# include <sys/uio.h>
#endif
#include <errno.h>
/*
* print out error message
*/
void
advise (char *what, char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
advertise (what, NULL, fmt, ap);
va_end(ap);
}
/*
* print out error message and exit
*/
void
adios (char *what, char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
advertise (what, NULL, fmt, ap);
va_end(ap);
done (1);
}
/*
* admonish the user
*/
void
admonish (char *what, char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
advertise (what, "continuing...", fmt, ap);
va_end(ap);
}
/*
* main routine for printing error messages.
*
* Use writev() if available, for slightly better performance.
* Why? Well, there are a couple of reasons. Primarily, it
* gives a smoother output... More importantly though, it's a
* sexy syscall()...
*/
void
advertise (char *what, char *tail, char *fmt, va_list ap)
{
int eindex = errno;
#ifdef HAVE_WRITEV
char buffer[BUFSIZ], err[BUFSIZ];
struct iovec iob[20], *iov;
#endif
fflush (stdout);
#ifdef HAVE_WRITEV
fflush (stderr);
iov = iob;
if (invo_name && *invo_name) {
iov->iov_len = strlen (iov->iov_base = invo_name);
iov++;
iov->iov_len = strlen (iov->iov_base = ": ");
iov++;
}
vsnprintf (buffer, sizeof(buffer), fmt, ap);
iov->iov_len = strlen (iov->iov_base = buffer);
iov++;
if (what) {
if (*what) {
iov->iov_len = strlen (iov->iov_base = " ");
iov++;
iov->iov_len = strlen (iov->iov_base = what);
iov++;
iov->iov_len = strlen (iov->iov_base = ": ");
iov++;
}
if (!(iov->iov_base = strerror (eindex))) {
/* this shouldn't happen, but we'll test for it just in case */
snprintf (err, sizeof(err), "Error %d", eindex);
iov->iov_base = err;
}
iov->iov_len = strlen (iov->iov_base);
iov++;
}
if (tail && *tail) {
iov->iov_len = strlen (iov->iov_base = ", ");
iov++;
iov->iov_len = strlen (iov->iov_base = tail);
iov++;
}
iov->iov_len = strlen (iov->iov_base = "\n");
iov++;
writev (fileno (stderr), iob, iov - iob);
#else
if (invo_name && *invo_name)
fprintf (stderr, "%s: ", invo_name);
vfprintf (stderr, fmt, ap);
if (what) {
char *s;
if (*what)
fprintf (stderr, " %s: ", what);
if ((s = strerror(eindex)))
fprintf (stderr, "%s", s);
else
fprintf (stderr, "Error %d", eindex);
}
if (tail)
fprintf (stderr, ", %s", tail);
fputc ('\n', stderr);
#endif
}
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