Index: include/ctype.h
===================================================================
--- include/ctype.h	(revision 7258c6ac4de2518c5430095742a27be7af0c89d7)
+++ include/ctype.h	(revision d2d593b0a5d498d4aeecd9fb6c945b0a65dfaa33)
@@ -102,4 +102,7 @@
 #endif	/* SYS5CODE */
 
+extern	int16_t	tolower(int16_t c);
+extern	int16_t	toupper(int16_t c);
+
 #endif	/* _CTYPE_C */
 
Index: include/stdio.h
===================================================================
--- include/stdio.h	(revision 7258c6ac4de2518c5430095742a27be7af0c89d7)
+++ include/stdio.h	(revision d2d593b0a5d498d4aeecd9fb6c945b0a65dfaa33)
@@ -47,4 +47,16 @@
 extern	FILE	*fopena(int8_t *name, int8_t *mode);
 extern	FILE	*fopenb(int8_t *name, int8_t *mode);
+extern	int16_t	fread(int8_t *buffer, uint16_t size, int16_t number, FILE *stream);
+extern	int16_t	fwrite(int8_t *buffer, int16_t size, int16_t number, FILE *stream);
+extern	int16_t	fseek(FILE *fp, int32_t pos, int16_t mode);
+extern	int16_t	fflush(FILE *ptr);
+extern	int16_t	fclose(FILE *ptr);
+
+extern	int32_t	printf(int8_t *fmt, ...);
+extern	int32_t	sprintf(int8_t *str, int8_t *fmt, ...);
+
+extern	int16_t	getc(FILE *ptr);
+extern	int16_t	putc(int16_t c, FILE *ptr);
+extern	int16_t	ungetc(int16_t c, FILE *ptr);
 
 #define	stdin	(&Cbuffs[0])
Index: include/vsddsw.h
===================================================================
--- include/vsddsw.h	(revision 7258c6ac4de2518c5430095742a27be7af0c89d7)
+++ include/vsddsw.h	(revision d2d593b0a5d498d4aeecd9fb6c945b0a65dfaa33)
@@ -34,3 +34,8 @@
 extern	void	CpyObj(uint16_t *from, uint16_t *to, uint16_t w, uint16_t h, uint16_t sw);
 
+extern	void	lseg(int16_t x1, int16_t y1, int16_t x2, int16_t y2, int16_t t);
+extern	void	vbfill4(uint16_t *obj, int16_t obwidth, int16_t xmin, int16_t ymin, int16_t xmax, int16_t ymax, uint16_t color);
 
+extern	void	tsplot4(int16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch);
+extern	void	vcputsv(int16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch);
+