/error/error.c

/*
 * error.c
 *
 *  Created on: Jul 16, 2009
 *      Author: gr00vy
 */

#include    <stdarg.h>          /* ANSI C header file */
#include    <syslog.h>          /* for syslog() */

/* si el proceso es un daemon mandar todo a syslog */
int daemon_proc = 0;

static void error_doit(int, int, const char *, va_list);

/* Nonfatal error related to system call */
void
error_ret(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	error_doit(1, LOG_INFO, fmt, ap);
	va_end(ap);
	return;
}

/* Fatal error related to system call */
void
error_sys(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	error_doit(1, LOG_ERR, fmt, ap);
	va_end(ap);
	exit(1);
}

/* Fatal error related to system call
 * Print message, dump core, and terminate */

void
error_dump(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	error_doit(1, LOG_ERR, fmt, ap);
	va_end(ap);
	abort(); /* dump core and terminate */
	exit(1); /* shouldn't get here */
}

/* Nonfatal error unrelated to system call
 * Print message and return */

void
error_msg(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	error_doit(0, LOG_INFO, fmt, ap);
	va_end(ap);
	return;
}

/* Fatal error unrelated to system call
 * Print message and terminate */

void
error_quit(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	error_doit(0, LOG_ERR, fmt, ap);

	va_end(ap);
	exit(1);
}

/* Print message and return to caller
 * Caller specifies "errnoflag" and "level" */

static void
error_doit(int errnoflag, int level, const char *fmt, va_list ap)
{
	int errno_save, n;
	char buf[MAXLINE + 1];

	errno_save = errno; /* value caller might want printed */

	#ifdef HAVE_VSNPRINTF
	vsnprintf(buf, MAXLINE, fmt, ap); * safe */
	#else
	vsprintf(buf, fmt, ap); /* not safe */
	#endif

	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); /* in case stdout and stderr are the same */
		fputs(buf, stderr);
		fflush(stderr);
	}

	return;
}