[PATCH nft 05/10] scanner: allow strings starting by underscores and dots

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POSIX.1-2008 (which is simultaneously IEEE Std 1003.1-2008) says:

"The set of characters from which portable filenames are constructed.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9 . _ -"

On top of that it says:

"The <hyphen> character should not be used as the first character of a
portable user name."

This allows a bit more things that NAME_REGEX though, but this still
looks fine to me.

For more info, see:
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_431
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_278

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/scanner.l | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/scanner.l b/src/scanner.l
index 3ad4dd9..6f497e8 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -112,7 +112,7 @@ decstring	{digit}+
 hexstring	0[xX]{hexdigit}+
 range		({decstring}?:{decstring}?)
 letter		[a-zA-Z]
-string		({letter})({letter}|{digit}|[/\-_\.])*
+string		({letter}|[_.])({letter}|{digit}|[/\-_\.])*
 quotedstring	\"[^"]*\"
 asteriskstring	({string}\*|{string}\\\*)
 comment		#.*$
-- 
2.1.4

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