Improve cat's unbuffered mode.

src/cat.c

@@ -79,27 +79,33 @@ int main(int argc, char **argv)
 
 
     /* i < argc is obvious; steps through all provided args. */
-    /* !argc-optind && !newbuf is a little less so - it allows this loop to run once if the user provides no paths */
-    for(i = optind; (i < argc) || (((argc - optind) == 0) && !newbuf); i++, newbufsize = 0)
+    /* !argc-optind && !c is a little less so - it allows this loop to run once if the user provides no paths */
+    do
 	{
 	if( !(fd = file_open(argv[i], "r")))
 	    {
 	    throw(FOPEN_FAIL, mastrcat(argv[0], mastrcat(": could not open file ", argv[i])));
 	    }
 
-	newbuf = file_read(fd, &newbufsize);
 	if(pars[U])
 	    {
-	    fwrite(newbuf, sizeof(char), newbufsize, stdout);
-	    free(newbuf);
-	    continue;
+	    for(; (c = fgetc(fd)) != EOF; c = 0)
+		{
+		fputc(c, stdout);
 		}
+	    }
+	else
+	    {
+	    newbuf = file_read(fd, &newbufsize);
 	    buf = concat(buf, newbuf, bufsize, newbufsize);
 	    bufsize += newbufsize;
 	    free(newbuf);
-
 	    }
 	
+	i++, newbufsize = 0;
+	}
+    while((i < argc) || (((argc - optind) == 0) && !c));
+
     if(!pars[U])
 	{
 	fwrite(buf, sizeof(char), bufsize, stdout);