extern int tls_feof(void);
extern int tls_ferror(void);
extern void tls_free_cert(void **);
-extern int tls_getc(void);
+extern int tls_getc(unsigned);
extern void tls_get_cache(void);
extern int tls_import_cert(const uschar *, void **);
extern int tls_read(BOOL, uschar *, size_t);
extern uschar *b64encode(uschar *, int);
extern int b64decode(uschar *, uschar **);
-extern int bdat_getc(void);
+extern int bdat_getc(unsigned);
extern void bits_clear(unsigned int *, size_t, int *);
extern void bits_set(unsigned int *, size_t, int *);
extern BOOL smtp_get_interface(uschar *, int, address_item *,
uschar **, uschar *);
extern BOOL smtp_get_port(uschar *, address_item *, int *, uschar *);
-extern int smtp_getc(void);
+extern int smtp_getc(unsigned);
extern void smtp_get_cache(void);
extern int smtp_handle_acl_fail(int, int, uschar *, uschar *);
extern void smtp_log_no_mail(void);
extern int spool_open_temp(uschar *);
extern int spool_read_header(uschar *, BOOL, BOOL);
extern int spool_write_header(uschar *, int, uschar **);
-extern int stdin_getc(void);
+extern int stdin_getc(unsigned);
extern int stdin_feof(void);
extern int stdin_ferror(void);
extern int stdin_ungetc(int);