; The OS/K Team licenses this file to you under the MIT license. ; See the LICENSE file in the project root for more information. argbuf.size := 256 argbuf = [argbuf.size] argv0 = [argbuf.size] argv1pos = 0 stdin_echoing = 1 ps1 = "C:\\> " main: .print_prompt: call print, ps1 ; empty argbuf mov rcx, argbuf.size mov rdx, argbuf stosb.rep rdx, zero ; iterator through argbuf mov rcx, zero mov q[argv1pos], zero .input_loop: pause pause pause ; Fill .buf with user input scan rax jmp.axz .input_loop ; backspace character? b.nz rax, 8, .handle_input ; anything to delete? jmp.cxz .input_loop ; no ; yes, delete it dec rcx, 1 add rdx, rcx, argbuf mov b[rdx], zero ; update screen cmp b[stdin_echoing], 1 prn.z 8 jmp .input_loop .handle_input: cmp b[stdin_echoing], 1 prn.z rax b.z rax, 10, .extract_argv0 ; when max line length is reached, ; force a newline b.z rcx, argbuf.size, .extract_argv0 ; add character to buffer and increase iterator (rcx) add rdx, rcx, argbuf mov b[rdx], rax inc rcx, 1 ; another one jmp .input_loop .extract_argv0: ; did we read anything at all? ; if not, just go back to waiting input jmp.cxz .print_prompt ; find first whitespace or null-terminator mov rcx, argbuf.size mov rdx, argbuf scasb.rep.nz rdx, ' ' ; argv1 exists? if so, save its position mov rsi, rdx .next_space: mov rcx, b[rsi] jmp.cxz .do_extract ; skip spaces cmp rcx, ' ' inc.z rsi, 1 jmp.z .next_space ; if we're here, we found a ; non-zero non-space character mov q[argv1pos], rsi ; fallthrough .do_extract: ; empty argv0 mov rcx, argbuf.size mov rax, argv0 stosb.rep rax, zero ; how much do we copy? sub rcx, rdx, argbuf jmp.cxz .detect_builtin dec rcx, 1 mov rdi, argbuf mov rsi, argv0 .copy_loop: mov b[rsi], b[rdi] inc rdi, 1 inc rsi, 1 loop .copy_loop .detect_builtin: .builtin_cls = "cls" call strcmp, argv0, .builtin_cls b.z rax, zero, .handle_CLS .builtin_date = "date" call strcmp, argv0, .builtin_date b.z rax, zero, .handle_DATE .builtin_dir = "dir" call strcmp, argv0, .builtin_dir b.z rax, zero, .handle_DIR .builtin_dump = "dump" call strcmp, argv0, .builtin_dump b.z rax, zero, .handle_DUMP .builtin_echo = "echo" call strcmp, argv0, .builtin_echo b.z rax, zero, .handle_ECHO .builtin_exit = "exit" call strcmp, argv0, .builtin_exit b.z rax, zero, .handle_EXIT .builtin_help = "help" call strcmp, argv0, .builtin_help b.z rax, zero, .handle_HELP .builtin_halt = "halt" call strcmp, argv0, .builtin_halt b.z rax, zero, .handle_HALT .builtin_print = "print" call strcmp, argv0, .builtin_print b.z rax, zero, .handle_PRINT .builtin_time = "time" call strcmp, argv0, .builtin_time b.z rax, zero, .handle_TIME .builtin_ver = "ver" call strcmp, argv0, .builtin_ver b.z rax, zero, .handle_VER jmp .command_not_found ; ; call builtins ; .handle_CLS: prn PRN_CLEAR jmp .print_prompt .handle_DATE: call GetTimeUTC push b[rax+3] mov rcx, b[rax+4] add rcx, rcx, 1 push rcx push w[rax+6] call printf, .datefmt inc rsp, 40 jmp .print_prompt .datefmt = "%d/%d/%d\n" .handle_DIR: call builtins.dir jmp .print_prompt .handle_DUMP: dump jmp .print_prompt .handle_ECHO: mov rdx, q[argv1pos] b.z rdx, 0, .echo.end mov rcx, argbuf.size prns.rep.nz rdx .echo.end: prn 10 jmp .print_prompt .handle_EXIT: mov rax, Sys.Shutdown trap 0 jmp .print_prompt .handle_HALT: mov rax, Sys.EnterHaltMode trap 0 jmp .print_prompt .handle_PRINT: mov rax, Sys.OpenFile mov ax0, q[argv1pos] b.z ax0, zero, .need_params trap 0 b.l rax, zero, .file_not_found mov ax0, rax mov ax1, FILE_LOADP mov ax2, FILE_MAXSZ mov rax, Sys.ReadFile trap 0 mov rcx, rax mov rax, Sys.CloseFile trap 0 b.l rcx, zero, .couldnt_read jmp.cxz .empty_file mov rdx, FILE_LOADP prns.rep rdx jmp .print_prompt .handle_TIME: call GetTimeUTC push b[rax] push b[rax+1] push b[rax+2] call printf, .timefmt inc rsp, 24 jmp .print_prompt .timefmt = "%d:%d:%d\n" .handle_VER: call print, cmd.versionstr prn 10 jmp .print_prompt .handle_HELP: call print, .helpmsg call print, .helpmsg.cls call print, .helpmsg.date call print, .helpmsg.dir call print, .helpmsg.dump call print, .helpmsg.echo call print, .helpmsg.exit call print, .helpmsg.help call print, .helpmsg.halt call print, .helpmsg.print call print, .helpmsg.time call print, .helpmsg.ver jmp .print_prompt .helpmsg = "The following commands are built-in:\n" .helpmsg.cls = " CLS Clear screen\n" .helpmsg.date = " DATE Display current date\n" .helpmsg.dir = " DIR Print contents of current directory\n" .helpmsg.dump = " DUMP Toggles debug instruction dumping\n" .helpmsg.echo = " ECHO Write arguments to standard output\n" .helpmsg.exit = " EXIT Initiate machine shutdown\n" .helpmsg.help = " HELP Display these messages\n" .helpmsg.halt = " HALT Put processor in halt mode\n" .helpmsg.print = " PRINT Display contents of text file\n" .helpmsg.time = " TIME Display current time of day\n" .helpmsg.ver = " VER Display current COMMAND.COM and DOS kernel versions\n" .command_not_found: call print, argv0 call print, .cnf_errmsg jmp .print_prompt .cnf_errmsg = ": command not found\n" .file_not_found: push q[argv1pos] push argv0 call printf, .fnf_errmsg inc rsp, 16 jmp .print_prompt .fnf_errmsg = "%s: %s: file not found\n" .empty_file: push q[argv1pos] push argv0 call printf, .ef_errmsg inc rsp, 16 jmp .print_prompt .ef_errmsg = "%s: %s: file was empty\n" .couldnt_read: push q[argv1pos] push argv0 call printf, .cno_errmsg inc rsp, 16 jmp .print_prompt .cno_errmsg = "%s: %s: an error occured while reading file\n" .need_params: call print, argv0 call print, .np_errmsg jmp .print_prompt .np_errmsg = ": need more parameters\n"