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/* errors.c -- error message handlers.
Copyright (C) 1998 Robert Stone <talby@trap.mtview.ca.us>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "errors.h"
#include "config.h"
/* compatibility section */
#ifdef HAVE_SYSLOG_H
# include <syslog.h>
#else /* HAVE_SYSLOG_H */
#warning no syslog facility? Errors will go to stderr.
# define syslog(x,y,z)
# define LOG_DEBUG 7
# define LOG_WARNING 4
# define LOG_ERR 3
#endif
#ifndef HAVE_VPRINTF
#error no vprintf? not ANSI C3.159-1989 (``ANSI C'') compliant?
#endif
#ifndef HAVE_STRERROR
#define strerror(x) "system error"
#endif
/* end compatibility section */
static char *progname = NULL;
static int show_status = 0;
static int use_syslog = 0;
static int message(int, const char *);
int initerrors(char *pn, int type, int stat) {
#ifdef HAVE_SYSLOG_H
if(type == 0 || type == 1) use_syslog = type;
#endif /* HAVE_SYSLOG_H */
if(pn != NULL) progname = pn;
if(stat == 0 || stat == 1) show_status = stat;
return(0);
}
int status(const char *fmt, ...) {
static char buf[1024];
va_list args;
if(!show_status) return(0);
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
return(message(LOG_DEBUG, buf));
}
int warn(const char *fmt, ...) {
static char buf[1024];
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
return(message(LOG_WARNING, buf));
}
int panic(const char *fmt, ...) {
static char buf[1024];
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
message(LOG_ERR, buf);
exit(1);
}
int message(int priority, const char *msg) {
char buf[1024];
/* only handle errno if this is not an informational message */
if(errno && priority < 5) {
snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(errno));
errno = 0;
} else strcpy(buf, msg);
if(use_syslog) syslog(priority, "%s", buf);
else fprintf(stderr, "%s: %s\n", progname, buf);
return(0);
}
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