Fixed crashes due to use of nested functions.

I have therefore added shared/fileio.c/h to encapsule
buffered file operations, thus making it possible
to re-read the configuration file unlike with the
patch I committed to stable-0-4-4.

See also: http://lists.omnipotent.net/pipermail/lcdproc/2003-December/008413.html

shared/fileio.c

@@ -0,0 +1,82 @@
+/*
+ * fileio.c
+ * This file is part of LCDd, the lcdproc server.
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ *
+ * Copyright (c) 2003, Rene Wagner
+ *
+ *
+ * Defines routines to read from buffered files.
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "fileio.h"
+
+#define FILECHUNKSIZE 10
+
+buffile *buffile_open( const char *path, const char *mode ) {
+	buffile * file = NULL;
+
+	file = malloc(sizeof(*file));
+	if ( NULL == file )
+		return NULL;
+	
+	file->pos=0;
+	file->bytesread=0;
+	
+	file->f = fopen( path, mode );
+	if( NULL == file->f ) {
+		free(file);
+		return NULL;
+	}
+
+	return file;
+}
+
+int buffile_close ( buffile * file ) {
+	int retval=0;
+
+	if (NULL == file)
+		return -1;
+	if ( NULL != file->f )
+		retval = fclose( file->f );
+	if ( NULL != file->buf )
+		free ( file->buf );
+	free (file);
+	file = NULL;
+
+	return retval;
+}
+
+char * buffile_read ( buffile * file, size_t n ) {
+	char * returnbuf=NULL;
+
+	if( NULL == file )
+		return NULL;
+
+	returnbuf = malloc(n);
+	if( NULL == returnbuf)
+		return NULL;
+
+	if( NULL == file->buf ) {
+		file->buf = malloc(FILECHUNKSIZE);
+		if( NULL == file->buf )
+			return NULL;
+	}
+
+	if( file->pos >= file->bytesread ) {
+		if( !( file->bytesread = fread( file->buf, 1, FILECHUNKSIZE, file->f ))) {
+			/* We're at the end*/
+			returnbuf[0]=0;
+			return returnbuf;
+		}
+		file->pos = 0;
+	}
+	strncpy(returnbuf, file->buf + (file->pos++), sizeof(returnbuf));
+	return returnbuf;
+}
+