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+;; -----------------------------------------------------------------------
+;;
+;; Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
+;;
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+;; Boston MA 02111-1307, USA; either version 2 of the License, or
+;; (at your option) any later version; incorporated herein by reference.
+;;
+;; -----------------------------------------------------------------------
+
+;;
+;; parsecmd.inc
+;;
+;; Command line parser code
+;;
+
+ section .text
+
+; -------------------------------------------------------------------------
+; getcommand: Get a keyword from the current "getc" file and match it
+; against a list of keywords (keywd_table). Each entry in
+; that table should have the following form:
+; <32 bit hash value> <16 bit handler offset>
+;
+; The handler is called, and upon return this function
+; returns with CF = 0. On EOF, this function returns
+; with CF = 1.
+; -------------------------------------------------------------------------
+
+getcommand:
+.find:
+ call skipspace ; Skip leading whitespace
+ jz .eof ; End of file
+ jc .find ; End of line: try again
+
+ ; Do this explicitly so #foo is treated as a comment
+ cmp al,'#' ; Leading hash mark -> comment
+ je .skipline
+
+ or al,20h ; Convert to lower case
+ movzx ebx,al ; Hash for a one-char keyword
+.read_loop:
+ push ebx
+ call getc
+ pop ebx
+ jc .eof
+ cmp al,' ' ; Whitespace
+ jbe .done
+ or al,20h
+ rol ebx,5
+ xor bl,al
+ jmp short .read_loop
+.done: call ungetc
+ call skipspace
+ jz .eof
+ jc .noparm
+ call ungetc ; Return nonwhitespace char to buf
+ mov si,keywd_table
+ mov cx,keywd_count
+.table_search:
+ lodsd
+ cmp ebx,eax
+ je .found_keywd
+ lodsd ; Skip entrypoint/argument
+ loop .table_search
+
+ ; Otherwise unrecognized keyword
+ mov si,err_badcfg
+ jmp short .error
+
+ ; No parameter
+.noparm:
+ mov si,err_noparm
+ mov al,10 ; Already at EOL
+.error:
+ call cwritestr
+ jmp short .skipline
+
+.found_keywd: lodsw ; Load argument into ax
+ call [si]
+ clc
+ ret
+
+.eof: stc
+ ret
+
+.skipline: cmp al,10 ; Search for LF
+ je .find
+ call getc
+ jc .eof
+ jmp short .skipline
+
+ section .data
+err_badcfg db 'Unknown keyword in configuration file.', CR, LF, 0
+err_noparm db 'Missing parameter in configuration file.', CR, LF, 0
+
+ section .uibss
+ alignb 4
+vk_size equ (vk_end + 3) & ~3
+VKernelBuf: resb vk_size ; "Current" vkernel
+AppendBuf resb max_cmd_len+1 ; append=
+Ontimeout resb max_cmd_len+1 ; ontimeout
+Onerror resb max_cmd_len+1 ; onerror
+KbdMap resb 256 ; Keyboard map
+FKeyName resb MAX_FKEYS*FILENAME_MAX ; File names for F-key help
+KernelCNameLen resw 1 ; Length of unmangled kernel name
+InitRDCNameLen resw 1 ; Length of unmangled initrd name
+%if IS_SYSLINUX
+KernelName resb FILENAME_MAX+1 ; Mangled name for kernel
+KernelCName resb FILENAME_MAX+2 ; Unmangled kernel name
+InitRDCName resb FILENAME_MAX+2 ; Unmangled initrd name
+%else
+KernelName resb FILENAME_MAX ; Mangled name for kernel
+KernelCName resb FILENAME_MAX ; Unmangled kernel name
+InitRDCName resb FILENAME_MAX ; Unmangled initrd name
+%endif
+MNameBuf resb FILENAME_MAX
+InitRD resb FILENAME_MAX