/*

 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