From d26bc9c9b95cf56f36864535f77b4fad197598e3 Mon Sep 17 00:00:00 2001
From: Robert Pengelly <robertapengelly@hotmail.com>
Date: Tue, 24 Sep 2024 03:38:39 +0100
Subject: [PATCH] Implemented internal PATH command

---
 build/chimaera.img           | Bin 368640 -> 368640 bytes
 build/chimaera.vhd           | Bin 34120704 -> 34120704 bytes
 src/apps/pcomm/Makefile.unix |   2 +-
 src/apps/pcomm/Makefile.w32  |   2 +-
 src/apps/pcomm/commands      |   1 +
 src/apps/pcomm/path.asm      | 382 +++++++++++++++++++++++++++++++++++
 src/apps/pcomm/pcomm.asm     |   4 +
 7 files changed, 389 insertions(+), 2 deletions(-)
 create mode 100644 src/apps/pcomm/path.asm

diff --git a/build/chimaera.img b/build/chimaera.img
index e54efb6ca01b07af2b2c93a6c9ab60e43eb18b0c..9b3333651981917c98afc409319888163e74865a 100644
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diff --git a/src/apps/pcomm/Makefile.unix b/src/apps/pcomm/Makefile.unix
index a7fc585..cf1db90 100644
--- a/src/apps/pcomm/Makefile.unix
+++ b/src/apps/pcomm/Makefile.unix
@@ -46,7 +46,7 @@ genver: genver.c
 	gcc -o $@ $^
 endif
 
-pcomm.com: ../../lib/crt/crt0.o cbreak.o cd.o crlf.o date.o del.o dir.o erase.o exit.o history.o mkdir.o pcomm.o rmdir.o set.o time.o touch.o type.o vector.o writechr.o writedec.o writehex.o writestr.o xmalloc.o xstrcpy.o ../../lib/crt/libc.a
+pcomm.com: ../../lib/crt/crt0.o cbreak.o cd.o crlf.o date.o del.o dir.o erase.o exit.o history.o mkdir.o path.o pcomm.o rmdir.o set.o time.o touch.o type.o vector.o writechr.o writedec.o writehex.o writestr.o xmalloc.o xstrcpy.o ../../lib/crt/libc.a
 	../../utils/binutils/slink --oformat msdos -o $@ $^
 
 %.o: %.asm
diff --git a/src/apps/pcomm/Makefile.w32 b/src/apps/pcomm/Makefile.w32
index 6c4cfa8..f694373 100644
--- a/src/apps/pcomm/Makefile.w32
+++ b/src/apps/pcomm/Makefile.w32
@@ -30,7 +30,7 @@ genhash.exe: genhash.c
 genver.exe: genver.c
 	gcc -o $@ $^
 
-pcomm.com: ../../lib/crt/crt0.o cbreak.o cd.o crlf.o date.o del.o dir.o erase.o exit.o history.o mkdir.o pcomm.o rmdir.o set.o time.o touch.o type.o vector.o writedec.o writehex.o writestr.o xmalloc.o xstrcpy.o ../../lib/crt/libc.a
+pcomm.com: ../../lib/crt/crt0.o cbreak.o cd.o crlf.o date.o del.o dir.o erase.o exit.o history.o mkdir.o path.o pcomm.o rmdir.o set.o time.o touch.o type.o vector.o writedec.o writehex.o writestr.o xmalloc.o xstrcpy.o ../../lib/crt/libc.a
 	../../utils/binutils/slink --oformat msdos -o $@ $^
 
 %.o: %.asm
diff --git a/src/apps/pcomm/commands b/src/apps/pcomm/commands
index ac84bbf..52e07c9 100644
--- a/src/apps/pcomm/commands
+++ b/src/apps/pcomm/commands
@@ -7,6 +7,7 @@ echo
 exit
 help
 mkdir
+path
 reboot
 rmdir
 set
diff --git a/src/apps/pcomm/path.asm b/src/apps/pcomm/path.asm
new file mode 100644
index 0000000..ff43d04
--- /dev/null
+++ b/src/apps/pcomm/path.asm
@@ -0,0 +1,382 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; @file            path.asm
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+%ifndef     HEX
+% define        HEX(y)                  0x##y
+%endif
+
+;******************************************************************************
+; @function         _handler_path
+;******************************************************************************
+global      _handler_path
+_handler_path:
+
+    push    ax
+    push    bx
+    push    cx
+    push    dx
+    push    si
+    push    di
+    push    es
+    push    ds
+    
+    xor     dx,     dx
+    call    _skip_whitespace
+    
+    cmp     byte ptr [bx],      0
+    jne     _handler_path.copy
+    
+    mov     si,     cs:[_vec_env]
+    mov     cx,     cs:[_vec_env + 4]
+    
+    mov     es,     si
+    xor     di,     di
+
+_handler_path.find:
+
+    and     cx,     cx
+    jz      _handler_path.err_no_path
+    
+    push    es
+    mov     ax,     es:[di]
+    
+    mov     es,     ax
+    push    es
+    
+    xor     bx,     bx
+    mov     ax,     es:[bx]
+    
+    push    cx
+    push    es
+    push    ds
+    
+    mov     cx,     ds
+    mov     es,     cx
+    mov     ds,     ax
+    
+    xor     ax,     ax
+    push    ax
+    
+    mov     ax,     offset _temp
+    push    ax
+    
+    call    _strcpy
+    add     sp,     4
+    
+    pop     ds
+    
+    mov     ax,     ds
+    mov     es,     ax
+    
+    mov     ax,     offset _var
+    push    ax
+    
+    mov     ax,     offset _temp
+    push    ax
+    
+    call    _strcmp
+    add     sp,     4
+    
+    pop     es
+    pop     cx
+    
+    and     ax,     ax
+    jz      _handler_path.print
+    
+    pop     ax
+    pop     es
+    
+    add     di,     2
+    
+    dec     cx
+    jz      _handler_path.err_no_path
+    
+    jmp     _handler_path.find
+
+_handler_path.print:
+
+    pop     ax
+    pop     es
+    
+    mov     ds,     ax
+    
+    xor     bx,     bx
+    call    _writestr
+    
+    mov     al,     '='
+    call    _writechr
+    
+    mov     ax,     es:[bx + 2]
+    
+    and     ax,     ax
+    jz      _handler_path.no_value
+    
+    mov     ds,     ax
+    
+    xor     bx,     bx
+    call    _writestr
+
+_handler_path.no_value:
+
+    pop     ds
+    pop     es
+    add     di,     2
+    
+    mov     al,     HEX (0D)
+    call    _writechr
+    
+    mov     al,     HEX (0A)
+    call    _writechr
+    
+    dec     cx
+    jz      _handler_path.done
+
+_handler_path.copy:
+
+    mov     si,     bx
+    
+    mov     di,     offset _arg
+    push    di
+    
+    xor     al,     al
+    
+    mov     cx,     256
+    rep     stosb
+    
+    pop     di
+    push    si
+    
+    call    _strlen
+    add     sp,     2
+    
+    mov     cx,     ax
+    rep     movsb
+
+_handler_path.trim:
+
+    cmp     byte ptr [di - 1],      ' '
+    ja      _handler_path.got_arg
+    
+    mov     byte ptr [di - 1],      0
+    dec     di
+    
+    jmp     _handler_path.trim
+
+_handler_path.got_arg:
+
+    mov     bx,     offset _arg
+    push    di
+    
+    mov     si,     cs:[_vec_env]
+    mov     cx,     cs:[_vec_env + 4]
+    
+    push    bx
+    
+    mov     es,     si
+    xor     di,     di
+
+_handler_path.find2:
+
+    and     cx,     cx
+    jz      _handler_path.no_var
+    
+    push    es
+    mov     ax,     es:[di]
+    
+    mov     es,     ax
+    push    es
+    
+    xor     bx,     bx
+    mov     ax,     es:[bx]
+    
+    push    cx
+    push    es
+    push    ds
+    
+    mov     cx,     ds
+    mov     es,     cx
+    mov     ds,     ax
+    
+    xor     ax,     ax
+    push    ax
+    
+    mov     ax,     offset _temp
+    push    ax
+    
+    call    _strcpy
+    add     sp,     4
+    
+    pop     ds
+    
+    mov     ax,     ds
+    mov     es,     ax
+    
+    mov     ax,     offset _var
+    push    ax
+    
+    mov     ax,     offset _temp
+    push    ax
+    
+    call    _strcmp
+    add     sp,     4
+    
+    pop     es
+    pop     cx
+    
+    and     ax,     ax
+    jz      _handler_path.found
+    
+    pop     ax
+    pop     es
+    
+    add     di,     2
+    
+    dec     cx
+    jz      _handler_path.no_var
+    
+    jmp     _handler_path.find2
+
+_handler_path.no_var:
+
+    mov     ax,     4
+    push    ax
+    
+    xor     ax,     ax
+    push    ax
+    
+    call    _xmalloc
+    add     sp,     4
+    
+    mov     si,     ax
+    push    ax
+    
+    mov     ax,     offset _vec_env
+    push    ax
+    
+    call    _vec_push
+    add     sp,     4
+    
+    mov     ax,     offset _var
+    push    ax
+    
+    call    _strlen
+    add     sp,     2
+    
+    mov     cx,     ax
+    inc     cx
+    
+    push    cx
+    push    dx
+    
+    call    _xmalloc
+    add     sp,     4
+    
+    push    es
+    push    si
+    
+    mov     es,     si
+    xor     si,     si
+    
+    mov     word ptr es:[si],       ax
+    push    di
+    mov     es,     ax
+    
+    mov     si,     offset _var
+    xor     di,     di
+    rep     movsb
+    
+    pop     di
+
+_handler_path.found:
+
+    pop     si
+    
+    mov     es,     si
+    xor     bx,     bx
+    
+    mov     ax,     es:[bx + 2]
+    
+    and     ax,     ax
+    jz      _handler_path.get_value
+    
+    push    ax
+    
+    call    _free
+    add     sp,     2
+    
+    xor     ax,     ax
+    mov     es:[bx + 2],        ax
+
+_handler_path.get_value:
+
+    pop     es
+    pop     bx
+    
+    pop     cx
+    sub     cx,     bx
+    
+    and     cx,     cx
+    jz      _handler_path.done
+    
+    push    cx
+    push    dx
+    
+    call    _xmalloc
+    add     sp,     4
+    
+    mov     es,     si
+    xor     di,     di
+    
+    mov     es:[di + 2],        ax
+    mov     es,     ax
+    
+    mov     si,     bx
+    xor     di,     di
+    rep     movsb
+    
+    jmp     _handler_path.done
+
+_handler_path.err_no_path:
+
+    mov     bx,     offset _err_no_path
+    call    _writestr
+
+_handler_path.done:
+
+    pop     ds
+    pop     es
+    pop     di
+    pop     si
+    pop     dx
+    pop     cx
+    pop     bx
+    pop     ax
+    ret
+
+;******************************************************************************
+; @function         _skip_whitespace
+;******************************************************************************
+global      _skip_whitespace
+_skip_whitespace:
+
+    cmp     byte ptr [bx],      0
+    je      _skip_whitespace.done
+    
+    cmp     byte ptr [bx],      ' '
+    ja      _skip_whitespace.done
+    
+    inc     bx
+    jmp     _skip_whitespace
+
+_skip_whitespace.done:
+
+    ret
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Data area.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+_err_no_path:                   db      "No Path",      HEX (0D),   HEX (0A),   HEX (00)
+_var:                           db      "PATH",                                 HEX (00)
+
+_arg:                           db      256     dup (0)
+_temp:                          db      256     dup (0)
diff --git a/src/apps/pcomm/pcomm.asm b/src/apps/pcomm/pcomm.asm
index 484b6db..8a41be4 100644
--- a/src/apps/pcomm/pcomm.asm
+++ b/src/apps/pcomm/pcomm.asm
@@ -2321,6 +2321,10 @@ _cmd_table:
     dw      0
     dw      _handler_mkdir
     
+    dw      hash_path
+    dw      0
+    dw      _handler_path
+    
     dw      hash_reboot
     dw      0
     dw      _handler_reboot
-- 
2.34.1