/*
 
 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, "%s", 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