From af428784d8226d967809736eb2e2fd9099f1b2d5 Mon Sep 17 00:00:00 2001
From: hpa <hpa>
Date: Tue, 25 Feb 2003 00:52:20 +0000
Subject: [PATCH] Actually support comment lines.

---
 NEWS            |  3 +++
 genhash.pl      |  5 ++++-
 keywords        |  1 +
 keywords.inc    |  1 +
 parseconfig.inc | 37 ++++++++++++++++++-------------------
 syslinux.doc    |  5 +++--
 6 files changed, 30 insertions(+), 22 deletions(-)

diff --git a/NEWS b/NEWS
index 107d8dd..1864dcd 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,9 @@ Starting with 1.47, changes marked with SYSLINUX/PXELINUX/ISOLINUX
 apply to that specific program only; other changes apply to all of
 them.
 
+Changes in 2.03:
+	* Actually support comment lines in the configuration file.
+
 Changes in 2.02:
 	* SYSLINUX: Security flaws have been found in the SYSLINUX
 	  installer when running setuid root.  Rewrite the SYSLINUX
diff --git a/genhash.pl b/genhash.pl
index a0d9bc2..6fab579 100755
--- a/genhash.pl
+++ b/genhash.pl
@@ -5,6 +5,9 @@
 
 while ( defined($keywd = <STDIN>) ) {
     chomp $keywd;
+    
+    ($keywd,$keywdname) = split(/\s+/, $keywd);
+    $keywdname = $keywd unless ( $keywdname );
 
     $l = length($keywd);
     $h = 0;
@@ -17,5 +20,5 @@ while ( defined($keywd = <STDIN>) ) {
 	$h, $keywd, $seenhash{$h};
     }
     $seenhash{$h} = $keywd;
-    printf("%-23s equ 0x%08x\n", "hash_\L${keywd}\E", $h);
+    printf("%-23s equ 0x%08x\n", "hash_${keywdname}", $h);
 }
diff --git a/keywords b/keywords
index 964c69a..f8e8c8e 100644
--- a/keywords
+++ b/keywords
@@ -1,3 +1,4 @@
+# hash
 append
 default
 display
diff --git a/keywords.inc b/keywords.inc
index 1025543..b1dacfd 100644
--- a/keywords.inc
+++ b/keywords.inc
@@ -44,6 +44,7 @@ keywd_size	equ 8	; Bytes per keyword
 		align 4, db 0
 
 keywd_table:
+		keyword hash,      pc_comment
 		keyword append,    pc_append
 		keyword default,   pc_default
 		keyword display,   pc_filecmd,  get_msg_file
diff --git a/parseconfig.inc b/parseconfig.inc
index 96c52b4..b24d924 100644
--- a/parseconfig.inc
+++ b/parseconfig.inc
@@ -79,10 +79,7 @@ pc_localboot:	call getint
 ; "kernel" command
 pc_kernel:	cmp word [VKernelCtr],byte 0
 		je .err				; ("label" section only)
-		mov di,trackbuf
-		push di
-		call getline
-		pop si
+		call pc_getline
 		mov di,VKernelBuf+vk_rname
 		call mangle_name
 .err:		ret
@@ -115,10 +112,7 @@ pc_setint16:
 ; "display", "font", "kbdmap"
 ;
 pc_filecmd:	push ax				; Function to tailcall
-		mov di,trackbuf
-		push di
-		call getline
-		pop si
+		call pc_getline
 		mov di,MNameBuf
 		push di
 		call mangle_name
@@ -217,10 +211,7 @@ pc_serial:	call getint
 ; "F"-key command
 ;
 pc_fkey:	push ax
-		mov di,trackbuf
-		push di
-		call getline			; Get filename to display
-		pop si
+		call pc_getline
 		pop di
 		call mangle_name		; Mangle file name
 		ret
@@ -229,10 +220,7 @@ pc_fkey:	push ax
 ; "label" command
 ;
 pc_label:	call commit_vk			; Commit any current vkernel
-		mov di,trackbuf			; Get virtual filename
-		push di
-		call getline
-		pop si
+		call pc_getline
 		mov di,VKernelBuf+vk_vname
 		call mangle_name		; Mangle virtual name
 		inc word [VKernelCtr]		; One more vkernel
@@ -254,14 +242,25 @@ pc_label:	call commit_vk			; Commit any current vkernel
 ;
 ; "say" command
 ;
-pc_say:		mov di,trackbuf			; "say" command
+pc_say:		call pc_getline			; "say" command
+		call writestr
+		jmp crlf			; tailcall
+
+;
+; Comment line
+;
+pc_comment	equ pc_getline			; Get a line and discard
+
+;
+; Common subroutine: load line into trackbuf; returns with SI -> trackbuf
+;
+pc_getline:	mov di,trackbuf
 		push di
 		call getline
 		xor al,al
 		stosb				; Null-terminate
 		pop si
-		call writestr
-		jmp crlf			; tailcall
+		ret
 
 ;
 ; Main loop for configuration file parsing
diff --git a/syslinux.doc b/syslinux.doc
index ae5903b..d6e579b 100644
--- a/syslinux.doc
+++ b/syslinux.doc
@@ -99,6 +99,8 @@ All options here applies to PXELINUX as well as SYSLINUX unless
 otherwise noted.  See pxelinux.doc for additional information on
 PXELINUX.
 
+# comment
+	A comment line.  The whitespace after the hash mark is mandatory.
 
 DEFAULT kernel options...
         Sets the default command line.  If SYSLINUX boots automatically,
@@ -291,8 +293,7 @@ F0 filename
 	the help screens, e.g. <Ctrl-F><2> to get to the F2 screen,
 	and <Ctrl-F><0> for the F10 one.
 
-In the configuration file blank lines and comment lines beginning
-with a hash mark (#) are ignored.
+Blank lines are ignored.
 
 Note that the configuration file is not completely decoded.  Syntax
 different from the one described above may still work correctly in this
-- 
2.7.4