From 6c64d97e70984c77be3cd8d4e03e9adf717e02fb Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Thu, 16 Jul 2026 08:25:35 +0200
Subject: shell: I/O redirection (>/<) and pipes (|); rewrite shell in C

- kernel I/O routing: PCB gains PROC_STDIN/PROC_STDOUT (default console $FF),
  inherited across fork. KGetc/KPutc route read/write/putc to the console or a
  file fd. New syscalls: putc(16), setin(17), setout(18), lookup(19).
  read/write now go through the routing; putc/puts/nl use SYS_PUTC.
- sys_lookup + NameTable move command-name resolution into the kernel.
- shell rewritten in C (c/sh.c): tokenizes a line, parses > / < / |, and drives
  fork+setin/setout+exec+wait. Pipes run as 'a > __pipe ; b < __pipe' (temp
  file). asm shell + cmdtab removed; StrEqual/SkipName kept for sys_lookup.
- libc: fork/exec/wait/setin/setout/lookup wrappers.
- verified: echo>file, cat file, wc<file, cat readme|wc -l, echo ...|wc.
---
 include/gbos.inc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'include')

diff --git a/include/gbos.inc b/include/gbos.inc
index 7c3f325..6aaaf73 100644
--- a/include/gbos.inc
+++ b/include/gbos.inc
@@ -67,8 +67,12 @@ DEF PROC_RAMB   RB 1    ; data/stack cart-RAM bank
 DEF PROC_WRAMB  RB 1    ; u-area SVBK bank (1..7)
 DEF PROC_PARENT RB 1
 DEF PROC_EXIT   RB 1    ; exit code (valid when PS_ZOMBIE)
+DEF PROC_STDIN  RB 1    ; $FF = console, else an open-file fd
+DEF PROC_STDOUT RB 1    ; $FF = console, else an open-file fd
 DEF PROC_SIZE   RB 0
 
+DEF STD_CONSOLE EQU $FF
+
 ; -----------------------------------------------------------------------------
 ; Syscall numbers (passed in C; args in DE/HL/B per call, ret in A)
 ; -----------------------------------------------------------------------------
@@ -88,7 +92,11 @@ DEF SYS_GETB    EQU 12   ; read a byte from an open file  (B=fd -> A, CF=EOF)
 DEF SYS_PUTB    EQU 13   ; append a byte to an open file  (B=fd, E=byte)
 DEF SYS_LIST    EQU 14   ; list a directory slot          (B=slot, DE=namebuf)
 DEF SYS_REMOVE  EQU 15   ; delete a file                  (DE=name)
-DEF SYS_MAX     EQU 16
+DEF SYS_PUTC    EQU 16   ; write a byte to stdout         (E=byte)
+DEF SYS_SETIN   EQU 17   ; set current stdin  fd          (B=fd, $FF=console)
+DEF SYS_SETOUT  EQU 18   ; set current stdout fd          (B=fd, $FF=console)
+DEF SYS_LOOKUP  EQU 19   ; program id for a command name  (DE=name -> A=id/$FF)
+DEF SYS_MAX     EQU 20
 ; (SYS_OPEN=4 / SYS_CLOSE=5 are now implemented by the filesystem)
 
 ; -----------------------------------------------------------------------------
-- 
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