/*

 module: errlib.c

 purpose: library of error functions

 reference: Stevens, Unix network programming (2ed), p.922

 */

#include "errlib.h"


#define MAXLINE 4095

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();
}