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Diffstat (limited to 'contrib/syslinux-4.02/core/parsecmd.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/parsecmd.inc | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/parsecmd.inc b/contrib/syslinux-4.02/core/parsecmd.inc new file mode 100644 index 0000000..30cd67f --- /dev/null +++ b/contrib/syslinux-4.02/core/parsecmd.inc @@ -0,0 +1,129 @@ +;; ----------------------------------------------------------------------- +;; +;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved +;; Copyright 2009 Intel Corporation; author: H. Peter Anvin +;; +;; 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 .text16 + +; ------------------------------------------------------------------------- +; 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.skipline: + call skipline + +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 + + ; Abuse the trackbuf by putting the keyword there for + ; possible error messaging... + mov di,trackbuf + stosb + or al,20h ; Convert to lower case + movzx ebx,al ; Hash for a one-char keyword +.read_loop: + call getc + jc .eof + cmp al,' ' ; Whitespace + jbe .done + stosb + or al,20h + rol ebx,5 + xor bl,al + jmp short .read_loop +.done: call ungetc + xor ax,ax + stosb ; Null-terminate the trackbuf + 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 + call writestr + mov si,trackbuf + call writestr + call crlf + jmp .skipline + + ; No parameter +.noparm: + mov si,err_noparm + call writestr + mov si,trackbuf + call writestr + call crlf + jmp .find + +.found_keywd: lodsw ; Load argument into ax + call [si] + clc + ret + +.eof: stc + ret + +skipline: cmp al,10 ; Search for LF + je .end + call getc + jnc skipline +.end: ret + + section .data16 +err_badcfg db 'Unknown keyword in configuration file: ',0 +err_noparm db 'Missing parameter in configuration file. Keyword: ',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 + ; This could be in .uibss but that makes PXELINUX overflow + section .bss16 +KbdMap resb 256 ; Keyboard map +FKeyName resb MAX_FKEYS*FILENAME_MAX ; File names for F-key help + global KernelName +KernelName resb FILENAME_MAX ; Mangled name for kernel +MNameBuf resb FILENAME_MAX +InitRD resb FILENAME_MAX + + section .text16 |