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Extract "stdio" part from shell
This commit is contained in:
Virgil Dupras
parent
8b7faa1f02
commit
5071ee9f40
@ -13,9 +13,10 @@
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; All numerical values in the Collapse OS shell are represented and parsed in
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; hexadecimal form, without prefix or suffix.
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; *** REQUIREMENTS ***
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; stdio
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; *** DEFINES ***
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; SHELL_GETC: Macro that calls a GetC routine for tty interface
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; SHELL_PUTC: Macro that calls a PutC routine for tty interface
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; SHELL_IO_GETC: Macro that calls a GetC routine for I/O ("load" cmd)
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; SHELL_IO_PUTC: Macro that calls a PutC routine for I/O ("save" cmd)
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; SHELL_EXTRA_CMD_COUNT: Number of extra cmds to be expected after the regular
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@ -45,12 +46,10 @@ SHELL_BUFSIZE .equ 0x20
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; Memory address that the shell is currently "pointing at" for peek, load, call
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; operations. Set with mptr.
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SHELL_MEM_PTR .equ SHELL_RAMSTART
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; Used to store formatted hex values just before printing it.
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SHELL_HEX_FMT .equ SHELL_MEM_PTR+2
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; Places where we store arguments specifiers and where resulting values are
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; written to after parsing.
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SHELL_CMD_ARGS .equ SHELL_HEX_FMT+2
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SHELL_CMD_ARGS .equ SHELL_MEM_PTR+2
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; Command buffer. We read types chars into this buffer until return is pressed
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; This buffer is null-terminated and we don't keep an index around: we look
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@ -77,7 +76,7 @@ shellInit:
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; to it rather than call it. Saves two precious bytes in the stack.
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shellLoop:
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; First, let's wait until something is typed.
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SHELL_GETC
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STDIO_GETC
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jr nz, shellLoop ; nothing typed? loop
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; got it. Now, is it a CR or LF?
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cp ASCII_CR
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@ -86,7 +85,7 @@ shellLoop:
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jr z, .do ; char is LF? do!
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; Echo the received character right away so that we see what we type
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SHELL_PUTC
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STDIO_PUTC
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; Ok, gotta add it do the buffer
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; save char for later
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@ -125,60 +124,6 @@ shellLoop:
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.prompt:
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.db "> ", 0
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; print null-terminated string pointed to by HL
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printstr:
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push af
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push hl
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.loop:
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ld a, (hl) ; load character to send
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or a ; is it zero?
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jr z, .end ; if yes, we're finished
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SHELL_PUTC
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inc hl
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jr .loop
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.end:
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pop hl
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pop af
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ret
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; print A characters from string that HL points to
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printnstr:
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push bc
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push hl
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ld b, a
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.loop:
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ld a, (hl) ; load character to send
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SHELL_PUTC
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inc hl
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djnz .loop
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.end:
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pop hl
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pop bc
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ret
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printcrlf:
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ld a, ASCII_CR
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SHELL_PUTC
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ld a, ASCII_LF
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SHELL_PUTC
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ret
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; Print the hex char in A
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printHex:
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push af
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push hl
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ld hl, SHELL_HEX_FMT
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call fmtHexPair
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ld a, 2
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call printnstr
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pop hl
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pop af
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ret
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; Parse command (null terminated) at HL and calls it
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shellParse:
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push af
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@ -448,7 +393,7 @@ shellPeek:
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; Load the specified number of bytes (max 0xff) from IO and write them in the
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; current memory pointer (which doesn't change). This gets chars from
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; SHELL_IO_GETC, which can be different from SHELL_GETC. Coupled with the
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; SHELL_IO_GETC, which can be different from STDIO_GETC. Coupled with the
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; "blockdev" part, this allows you to dynamically select your IO source.
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; Control is returned to the shell only after all bytes are read.
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;
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@ -475,7 +420,7 @@ shellLoad:
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; Load the specified number of bytes (max 0xff) from the current memory pointer
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; and write them to I/O. Memory pointer doesn't move. This puts chars to
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; SHELL_IO_PUTC, which can be different from SHELL_PUTC. Coupled with the
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; SHELL_IO_PUTC, which can be different from STDIO_PUTC. Coupled with the
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; "blockdev" part, this allows you to dynamically select your IO source.
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; Control is returned to the shell only after all bytes are written.
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;
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68
parts/stdio.asm
Normal file
68
parts/stdio.asm
Normal file
@ -0,0 +1,68 @@
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; stdio
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;
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; Allows other modules to print to "standard out", that is, the console through
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; which the user is connected in a decoupled manner.
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;
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; *** REQUIREMENTS ***
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; STDIO_GETC: a macro that follows GetC API
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; STDIO_PUTC: a macro that follows GetC API
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; *** VARIABLES ***
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; Used to store formatted hex values just before printing it.
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STDIO_HEX_FMT .equ STDIO_RAMSTART
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STDIO_RAMEND .equ STDIO_HEX_FMT+2
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; print null-terminated string pointed to by HL
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printstr:
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push af
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push hl
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.loop:
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ld a, (hl) ; load character to send
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or a ; is it zero?
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jr z, .end ; if yes, we're finished
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STDIO_PUTC
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inc hl
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jr .loop
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.end:
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pop hl
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pop af
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ret
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; print A characters from string that HL points to
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printnstr:
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push bc
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push hl
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ld b, a
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.loop:
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ld a, (hl) ; load character to send
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STDIO_PUTC
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inc hl
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djnz .loop
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.end:
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pop hl
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pop bc
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ret
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printcrlf:
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ld a, ASCII_CR
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STDIO_PUTC
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ld a, ASCII_LF
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STDIO_PUTC
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ret
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; Print the hex char in A
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printHex:
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push af
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push hl
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ld hl, STDIO_HEX_FMT
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call fmtHexPair
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ld a, 2
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call printnstr
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pop hl
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pop af
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ret
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