Defined EOF as -1 in stdio.h.

Implemented the sprintf() library function in lib/stdio.c which uses the
vsprintf() function.

Implemented a very primative controlling TTY for each process. This is
achieved by a switch in the sys_puts system call which uses the 'ctty'
element of the process' task structure to determine an appropriate I/O
channel. A negative ctty value doesn't equate to any I/O channel
effectively disabling the process' output.

Added the sys_ctty system call which allows a process to set it's own
ctty value.

Removed the sys_rsputs system call. Output to serial is now performed by
the process first setting it's ctty value to 1, then invoking sys_puts.

1 files changed, 5 insertions, 2 deletions

diff --git a/include/stdio.h b/include/stdio.h
index 94cf227..824eb31 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -3,12 +3,15 @@
 
 #include <stdarg.h>
 
+#define EOF -1
+
 int puts(char*);
-int rsputs(char*);
 
 int printf(char*, ...);
-int rsprintf(char*, ...);
+int sprintf(char*, char*, ...);
 
 int vsprintf(char*, char*, va_list);
 
+int ctty(int ctty);
+
 #endif