Re: [Freedos-devel] CLS reimplementation (Re: VERIFY reimplementation)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Remitente: Steve Nickolas Destinatario: "Bitácora de Javier Gutiérrez Chamorro (Gu\\" <"Bitácora de Javier Gutiérrez Chamorro (Gu\\"> Fecha: miércoles, 14 de septiembre de 2022, 14:42:02 Asunto: [Freedos-devel] CLS reimplementation (Re: VERIFY reimplementation) Archivos: --===-- On Wed, 14 Sep 2022, Bitácora de Javier Gutiérrez Chamorro (Guti) wrote: > Dear Jim, There is no practical purpose on my mind, just the challenge > of > rapidly and efficiently convert it. As you said, both CLS and VERIFY > are > internal commands. > What surprised me about your ANSI fallback is that DOSBox, MS-DOS and > > DR-DOS already work it that way, but not the command console in Windows > 11. > It seems that with time we are losing capabilities instead of > gaining. > In fact any argument passed to CLS will trigger the help screen no > matter > if it is -h, /? or whatever. It was simply silly to check for it, > since CLS > should not expect any argument. BTW, your implementation does > the same, > checking argc > 1 which is smart too. > At least in your 2.01 and 2.1 versions there is no possibility of > changing > colors, maybe they were lost in previous versions. But as you > said, this > does not matter, just a curiosity. Kind regards. I myself only implemented cls at the same level as MS-DOS, and the most basic cls looks something like this (NASM): ; Copyright 2001, 2002, 2003, 2022 S. V. Nickolas. ; ; Redistribution in whole or in part, with or without modification, is ; hereby permitted without restriction. This software is provided "as is" ; and all warranties, express or implied, are hereby disclaimed. cpu 8086 org 0x0100 entry: mov ax, 0x4400 mov bx, 1 ; stdout int 0x21 jc .2 test dx, 0x0010 ; is CON: jz .2 mov byte [maxrow], 24 mov ah, 0x12 ; do we have an EGA? mov bx, 0xFF10 mov cx, 0x int 0x10 cmp cx, 0x ; unchanged = MDA or CGA je .1 ; = always 25 lines mov ax, 0x0040 ; otherwise, lines-1 is stored at push es ; 0040:0084 mov es, ax mov ah, [es:0x0084] pop es mov [maxrow], ah .1: mov ah, 0x0F ; this, OTOH, works on anything int 0x10 dec ah mov [maxcol], ah mov ax, 0x0600 ; method used by MS-DOS COMMAND.COM mov bh, 0x07 xor cx, cx mov dx, [maxcol] ; pulls in maxrow also push bp ; BUG WORKAROUND int 0x10 pop bp xor dx, dx mov ah, 0x02 xor bh, bh int 0x10 jmp short .3 .2: mov dx, eansi mov ah, 0x09 int 0x21 .3: mov ax, 0x4C00 int 0x21 ; EXIT CODE 0 maxcol: db 79 ; Must be in this order maxrow: db 24 eansi: db 27, "[2J$" =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Like the idea of using the scroll zero lines instead of my method of changing video mode.___ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
Re: [Freedos-devel] CLS reimplementation (Re: VERIFY reimplementation)
On Wed, 14 Sep 2022, Bitácora de Javier Gutiérrez Chamorro (Guti) wrote: Dear Jim, There is no practical purpose on my mind, just the challenge of rapidly and efficiently convert it. As you said, both CLS and VERIFY are internal commands. What surprised me about your ANSI fallback is that DOSBox, MS-DOS and DR-DOS already work it that way, but not the command console in Windows 11. It seems that with time we are losing capabilities instead of gaining. In fact any argument passed to CLS will trigger the help screen no matter if it is -h, /? or whatever. It was simply silly to check for it, since CLS should not expect any argument. BTW, your implementation does the same, checking argc > 1 which is smart too. At least in your 2.01 and 2.1 versions there is no possibility of changing colors, maybe they were lost in previous versions. But as you said, this does not matter, just a curiosity. Kind regards. I myself only implemented cls at the same level as MS-DOS, and the most basic cls looks something like this (NASM): ; Copyright 2001, 2002, 2003, 2022 S. V. Nickolas. ; ; Redistribution in whole or in part, with or without modification, is ; hereby permitted without restriction. This software is provided "as is" ; and all warranties, express or implied, are hereby disclaimed. cpu 8086 org 0x0100 entry:mov ax, 0x4400 mov bx, 1 ; stdout int 0x21 jc.2 test dx, 0x0010 ; is CON: jz.2 mov byte [maxrow], 24 mov ah, 0x12; do we have an EGA? mov bx, 0xFF10 mov cx, 0x int 0x10 cmp cx, 0x ; unchanged = MDA or CGA je.1 ; = always 25 lines mov ax, 0x0040 ; otherwise, lines-1 is stored at push es ; 0040:0084 mov es, ax mov ah, [es:0x0084] pop es mov [maxrow], ah .1: mov ah, 0x0F; this, OTOH, works on anything int 0x10 dec ah mov [maxcol], ah mov ax, 0x0600 ; method used by MS-DOS COMMAND.COM mov bh, 0x07 xor cx, cx mov dx, [maxcol]; pulls in maxrow also push bp ; BUG WORKAROUND int 0x10 pop bp xor dx, dx mov ah, 0x02 xor bh, bh int 0x10 jmp short .3 .2: mov dx, eansi mov ah, 0x09 int 0x21 .3: mov ax, 0x4C00 int 0x21; EXIT CODE 0 maxcol: db79 ; Must be in this order maxrow: db24 eansi:db27, "[2J$" ___ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
Re: [Freedos-devel] CLS reimplementation (Re: VERIFY reimplementation)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Remitente: Jim Hall Destinatario: Technical discussion and questions for FreeDOS developers. Fecha: miércoles, 14 de septiembre de 2022, 14:00:14 Asunto: [Freedos-devel] CLS reimplementation (Re: VERIFY reimplementation) Archivos: --===-- On Wed, Sep 14, 2022 at 6:24 AM Javier Gutiérrez Chamorro wrote: > And now it is the turn of CLS (sorry Jim ;-) It reproduces the same > CLS.C behaviour, including the redirection detection, but instead of > a 9,080 bytes CLS.EXE it creates a 380 bytes CLS.COM. > What I did not like about the original C implementation was the use > of the non-portable clrscr() which is not available in OpenWatcom. So > I guess that this ASM implementation would be also more portable. > It is available at > https://sourceforge.net/projects/nikkhokkho/files/CLS/ I don't mind. :-) I wrote that version of CLS long ago, back when I wasn't sure if CLS should be an internal or external command. CLS is now an internal command, so my original CLS is dead anyway. With the original external CLS, I made an update that could also set the text foreground and background colors, but I mainly did this because rewriting CLS as an external command didn't make much sense if all it did was clear the screen and reset the cursor. Changing the colors justified (in my mind) making this an external "extended" command. I think the usage was like "CLS white on blue" to set the colors to 7,1 and "CLS bright white on blue" to set the colors to 15,1. You are right, the original CLS external command used the clrscr() function from Borland's conio library to clear the screen. I recall the program detected if the user was on a console, and used clrscr() to clear the screen - otherwise, it used an ANSI sequence to clear the screen (such as a terminal). The equivalent console function in OpenWatcom is _clearscreen(_GCLEARSCREEN) from graph.h. IA-16 GCC has an i86 library that I believe implements clrscr() as well. I'm curious: why does your CLS use "-h" for help instead of "/?" ___ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Dear Jim, There is no practical purpose on my mind, just the challenge of rapidly and efficiently convert it. As you said, both CLS and VERIFY are internal commands. What surprised me about your ANSI fallback is that DOSBox, MS-DOS and DR-DOS already work it that way, but not the command console in Windows 11. It seems that with time we are losing capabilities instead of gaining. In fact any argument passed to CLS will trigger the help screen no matter if it is -h, /? or whatever. It was simply silly to check for it, since CLS should not expect any argument. BTW, your implementation does the same, checking argc > 1 which is smart too. At least in your 2.01 and 2.1 versions there is no possibility of changing colors, maybe they were lost in previous versions. But as you said, this does not matter, just a curiosity. Kind regards.___ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
Re: [Freedos-devel] CLS reimplementation (Re: VERIFY reimplementation)
On Wed, Sep 14, 2022 at 6:24 AM Javier Gutiérrez Chamorro wrote: > > And now it is the turn of CLS (sorry Jim ;-) It reproduces the same > CLS.C behaviour, including the redirection detection, but instead of > a 9,080 bytes CLS.EXE it creates a 380 bytes CLS.COM. > > What I did not like about the original C implementation was the use > of the non-portable clrscr() which is not available in OpenWatcom. So > I guess that this ASM implementation would be also more portable. > > It is available at > https://sourceforge.net/projects/nikkhokkho/files/CLS/ I don't mind. :-) I wrote that version of CLS long ago, back when I wasn't sure if CLS should be an internal or external command. CLS is now an internal command, so my original CLS is dead anyway. With the original external CLS, I made an update that could also set the text foreground and background colors, but I mainly did this because rewriting CLS as an external command didn't make much sense if all it did was clear the screen and reset the cursor. Changing the colors justified (in my mind) making this an external "extended" command. I think the usage was like "CLS white on blue" to set the colors to 7,1 and "CLS bright white on blue" to set the colors to 15,1. You are right, the original CLS external command used the clrscr() function from Borland's conio library to clear the screen. I recall the program detected if the user was on a console, and used clrscr() to clear the screen - otherwise, it used an ANSI sequence to clear the screen (such as a terminal). The equivalent console function in OpenWatcom is _clearscreen(_GCLEARSCREEN) from graph.h. IA-16 GCC has an i86 library that I believe implements clrscr() as well. I'm curious: why does your CLS use "-h" for help instead of "/?" ___ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
