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shell: add "save" command
The opposite of "load"
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@ -17,6 +17,7 @@
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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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; ones. See comment in COMMANDS section for details.
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; SHELL_RAMSTART
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@ -24,7 +25,7 @@
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; *** CONSTS ***
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; number of entries in shellCmdTbl
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SHELL_CMD_COUNT .equ 4+SHELL_EXTRA_CMD_COUNT
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SHELL_CMD_COUNT .equ 5+SHELL_EXTRA_CMD_COUNT
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; maximum number of bytes to receive as args in all commands. Determines the
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; size of the args variable.
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@ -460,6 +461,34 @@ shellLoad:
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xor a
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ret
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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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; "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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; Example: save 42
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shellSaveCmd:
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.db "save", 0b001, 0, 0
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shellSave:
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push bc
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push hl
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ld a, (hl)
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ld b, a
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ld hl, (SHELL_MEM_PTR)
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.loop:
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ld a, (hl)
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inc hl
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SHELL_IO_PUTC
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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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xor a
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ret
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; Calls the routine where the memory pointer currently points. This can take two
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; parameters, A and HL. The first one is a byte, the second, a word. These are
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; the values that A and HL are going to be set to just before calling.
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@ -502,5 +531,5 @@ shellCall:
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; This table is at the very end of the file on purpose. The idea is to be able
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; to graft extra commands easily after an include in the glue file.
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shellCmdTbl:
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.dw shellMptrCmd, shellPeekCmd, shellLoadCmd, shellCallCmd
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.dw shellMptrCmd, shellPeekCmd, shellLoadCmd, shellSaveCmd, shellCallCmd
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