/*
 
 module: errlib.c
 
 purpose: library of error functions
 
 reference: Stevens, Unix network programming (2ed), p.922
 
 */

#include "errlib.h"


#define MAXLINE 4095

#ifdef __CPLUSPLUS
extern "C" {
#endif 
        
        int daemon_proc = 0; /* set to 0 if stdout/stderr available, else set to 1 */
        
        static void err_doit (int errnoflag, int level, const char *fmt, va_list ap)
        {
                int errno_save = errno, n;
                char buf[MAXLINE+1];
                
                vsnprintf (buf, MAXLINE, fmt, ap);
                n = strlen(buf);
                if (errnoflag)
                        snprintf (buf+n, MAXLINE-n, ": %s", strerror(errno_save));
                strcat (buf, "\n");
                
                if (daemon_proc)
                        syslog (level, buf);
                else {
                        fflush (stdout);
                        fprintf (stderr, buf);
                        fflush (stderr);
                }
                
                return;
        }
        
        void err_ret (const char *fmt, ...)
        {
                va_list ap;
                
                va_start (ap, fmt);
                err_doit (1, LOG_INFO, fmt, ap);
                va_end (ap);
                return;
        }
        
        void err_sys (const char *fmt, ...)
        {
                va_list ap;
                
                va_start (ap, fmt);
                err_doit (1, LOG_ERR, fmt, ap);
                va_end (ap);
                exit (1);
        }
        
        void err_msg (const char *fmt, ...)
        {
                va_list ap;
                
                va_start (ap, fmt);
                err_doit (0, LOG_INFO, fmt, ap);
                va_end (ap);
                return;
        }
        
        void err_quit (const char *fmt, ...)
        {
                va_list ap;
                
                va_start (ap, fmt);
                err_doit (0, LOG_ERR, fmt, ap);
                va_end (ap);
                exit (1);
        }
        
        void err_dump (const char *fmt, ...)
        {
                va_list ap;
                
                va_start (ap, fmt);
                err_doit (1, LOG_ERR, fmt, ap);
                va_end (ap);
                abort();
        }
        
#ifdef __CPLUSPLUS
}
#endif