From 7b5c532625a864a3fbaf76f44df6aa99b0d6861e Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Thu, 16 Jul 2026 07:53:19 +0200
Subject: filesystem: a RAM FS (WRAMX) + ls/cat/save/rm; wc/head read files

- fs.asm: 8-slot RAM filesystem in WRAMX ($D000-$DFFF), name[8]+len[2]+data[502];
  syscalls open/close/getb/putb/list/remove, seeded with a 'readme' at boot.
- libc: open/close/fgetc/fputc/flist/fremove wrappers + O_READ/O_WRITE/NOFD.
- tools: ls, save (stdin->file, one line), rm; cat/wc/head now take a file arg.
- fix: syscall dispatch clobbers A, so putb takes its byte in E (was reading the
  handler's low address byte, 0xDC); ls NUL-terminates 8-char names.
- verified: save/cat/ls/rm cycle; wc readme -> '2 7 38'; head -n 1 readme.
- README: document the filesystem + the A-clobber ABI note.
---
 src/kdata.asm | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/kdata.asm')

diff --git a/src/kdata.asm b/src/kdata.asm
index 5b91030..9aca466 100644
--- a/src/kdata.asm
+++ b/src/kdata.asm
@@ -38,3 +38,10 @@ wExitParentPid:: DS 1
 wWaitMyPid::     DS 1
 wWaitRetPid::    DS 1
 wWaitRetCode::   DS 1
+
+; filesystem: open-file table + scratch
+wOFTable::   DS OF_MAX * OF_SIZE
+wFsMode::    DS 1
+wFsSlot::    DS 1
+wFsByte::    DS 1
+wFsOFPtr::   DS 2
-- 
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