bool{} is false for empty strings

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 530d9e3c493924ca09468cceb8c8814a8b5175af..12d8137818421cec23ca895c10aee2566b4d14d4 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -175,7 +175,7 @@
 <authorinitials>EM</authorinitials>
 <revhistory><revision>
   <revnumber>4.77</revnumber>
-  <date>03 Oct 2011</date>
+  <date>10 Oct 2011</date>
   <authorinitials>EM</authorinitials>
 </revision></revhistory>
 <copyright><year>2011</year><holder>University of Cambridge</holder></copyright>
@@ -7779,7 +7779,7 @@ pattern must be an appropriate query for the lookup type, as described in
 chapter &<<CHAPfdlookup>>&. For example:
 .code
 hold_domains = mysql;select domain from holdlist \
-  where domain = '$domain';
+  where domain = '${quote_mysql:$domain}';
 .endd
 In most cases, the data that is looked up is not used (so for an SQL query, for
 example, it doesn't matter what field you select). Exim is interested only in
@@ -9871,7 +9871,10 @@ zero.
 This condition turns a string holding a true or false representation into
 a boolean state.  It parses &"true"&, &"false"&, &"yes"& and &"no"&
 (case-insensitively); also positive integer numbers map to true if non-zero,
-false if zero.  Leading and trailing whitespace is ignored.
+false if zero.
+An empty string is treated as false.
+Leading and trailing whitespace is ignored;
+thus a string consisting only of whitespace is false.
 All other string values will result in expansion failure.
 
 When combined with ACL variables, this expansion condition will let you
@@ -10208,10 +10211,12 @@ See &*match_local_part*&.
 
 .vitem &*match_ip&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
 .cindex "&%match_ip%& expansion condition"
+.new
 This condition matches an IP address to a list of IP address patterns. It must
 be followed by two argument strings. The first (after expansion) must be an IP
-address or an empty string. The second (after expansion) is a restricted host
+address or an empty string. The second (not expanded) is a restricted host
 list that can match only an IP address, not a host name. For example:
+.wen
 .code
 ${if match_ip{$sender_host_address}{1.2.3.4:5.6.7.8}{...}{...}}
 .endd
@@ -10257,6 +10262,11 @@ just as easy to use the fact that a lookup is itself a condition, and write:
 .endd
 .endlist ilist
 
+.new
+Note that <&'string2'&> is not itself subject to string expansion, unless
+Exim was built with the EXPAND_LISTMATCH_RHS option.
+.wen
+
 Consult section &<<SECThoslispatip>>& for further details of these patterns.
 
 .vitem &*match_local_part&~{*&<&'string1'&>&*}{*&<&'string2'&>&*}*&
@@ -10656,7 +10666,7 @@ number of lines in the message's body. See also &$message_linecount$&.
 .cindex "binary zero" "in message body"
 .vindex "&$body_zerocount$&"
 When a message is being received or delivered, this variable contains the
-number of binary zero bytes in the message's body.
+number of binary zero bytes (ASCII NULs) in the message's body.
 
 .vitem &$bounce_recipient$&
 .vindex "&$bounce_recipient$&"
@@ -13066,7 +13076,7 @@ section &<<SECTcallvercache>>& for details of the caching.
 This option defines the &"random"& local part that can be used as part of
 callout verification. The default value is
 .code
-$primary_host_name-$tod_epoch-testing
+$primary_hostname-$tod_epoch-testing
 .endd
 See section &<<CALLaddparcall>>& for details of how this value is used.
 
@@ -27769,7 +27779,7 @@ check for a &"random"& local part at the same domain. The local part is not
 really random &-- it is defined by the expansion of the option
 &%callout_random_local_part%&, which defaults to
 .code
-$primary_host_name-$tod_epoch-testing
+$primary_hostname-$tod_epoch-testing
 .endd
 The idea here is to try to determine whether the remote host accepts all local
 parts without checking. If it does, there is no point in doing callouts for
@@ -35029,7 +35039,7 @@ integer size comparisons against this value.
 A colon-separated list of names of headers included in the signature.
 .vitem &%$dkim_key_testing%&
 "1" if the key record has the "testing" flag set, "0" if not.
-.vitem &%$dkim_key_nosubdomaining%&
+.vitem &%$nosubdomains%&
 "1" if the key record forbids subdomaining, "0" otherwise.
 .vitem &%$dkim_key_srvtype%&
 Service type (tag s=) from the key record. Defaults to "*" if not specified