#include	<errno.h>		/* for definition of errno */

#include	<stdarg.h>		/* ANSI C header file */

#include	"ourhdr.h"



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



char	*pname = NULL;		/* caller can set this from argv[0] */



/* Nonfatal error related to a system call.

 * Print a message and return. */



void

err_ret(const char *fmt, ...)

{

	va_list		ap;



	va_start(ap, fmt);

	err_doit(1, fmt, ap);

	va_end(ap);

	return;

}



/* Fatal error related to a system call.

 * Print a message and terminate. */



void

err_sys(const char *fmt, ...)

{

	va_list		ap;



	va_start(ap, fmt);

	err_doit(1, fmt, ap);

	va_end(ap);

	exit(1);

}



/* Fatal error related to a system call.

 * Print a message, dump core, and terminate. */



void

err_dump(const char *fmt, ...)

{

	va_list		ap;



	va_start(ap, fmt);

	err_doit(1, fmt, ap);

	va_end(ap);

	abort();		/* dump core and terminate */

	exit(1);		/* shouldn't get here */

}



/* Nonfatal error unrelated to a system call.

 * Print a message and return. */



void

err_msg(const char *fmt, ...)

{

	va_list		ap;



	va_start(ap, fmt);

	err_doit(0, fmt, ap);

	va_end(ap);

	return;

}



/* Fatal error unrelated to a system call.

 * Print a message and terminate. */



void

err_quit(const char *fmt, ...)

{

	va_list		ap;



	va_start(ap, fmt);

	err_doit(0, fmt, ap);

	va_end(ap);

	exit(1);

}



/* Print a message and return to caller.

 * Caller specifies "errnoflag". */



static void

err_doit(int errnoflag, const char *fmt, va_list ap)

{

	int		errno_save;

	char	buf[MAXLINE];



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

	vsprintf(buf, fmt, ap);

	if (errnoflag)

		sprintf(buf+strlen(buf), ": %s", strerror(errno_save));

	strcat(buf, "\n");

	fflush(stdout);		/* in case stdout and stderr are the same */

	fputs(buf, stderr);

	fflush(NULL);		/* flushes all stdio output streams */

	return;

}