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fix issue #249 don't try to read or write a directory

--- a/run.c

+++ b/run.c

@@ -35,6 +35,7 @@

 #include <stdlib.h>

 #include <time.h>

 #include <sys/types.h>

+#include <sys/stat.h>

 #include <sys/wait.h>

 #include "awk.h"

 #include "awkgram.tab.h"

@@ -2258,9 +2259,11 @@

 	size_t i;

 	int m;

 	FILE *fp = NULL;

+	struct stat sbuf;

 	if (*s == '\0')

 		FATAL("null file name in print or getline");

+

 	for (i = 0; i < nfiles; i++)

 		if (files[i].fname && strcmp(s, files[i].fname) == 0 &&

 		    (a == files[i].mode || (a==APPEND && files[i].mode==GT) ||

@@ -2271,7 +2274,6 @@

 		}

 	if (a == FFLUSH)	/* didn't find it, so don't create it! */

 		return NULL;

-

 	for (i = 0; i < nfiles; i++)

 		if (files[i].fp == NULL)

 			break;

@@ -2285,7 +2287,14 @@

 		nfiles = nnf;

 		files = nf;

 	}

+

 	fflush(stdout);	/* force a semblance of order */

+

+	/* don't try to read or write a directory */

+	if (a == LT || a == GT || a == APPEND)

+		if (stat(s, &sbuf) == 0 && S_ISDIR(sbuf.st_mode))

+				return NULL;

+

 	m = a;

 	if (a == GT) {

 		fp = fopen(s, "w");

-- 

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