config: Make text_file_save and 'dialplan save' escape semicolons in values.

When a config file is read, an unescaped semicolon signals comments which are
stripped from the value before it's stored.  Escaped semicolons are then
unescaped and become part of the value.  Both of these behaviors are normal
and expected.  When the config is serialized either by 'dialplan save' or
AMI/UpdateConfig however, the now unescaped semicolons are written as-is.
If you actually reload the file just saved, the unescaped semicolons are
now treated as start of comments.

Since true comments are stripped on read, any semicolons in
ast_variable.value must have been escaped originally.  This patch
re-escapes semicolons in ast_variable.values before they're written to
file either by 'dialplan save' or config/ast_config_text_file_save which
is called by AMI/UpdateConfig. I also fixed a few pre-existing formatting
issues nearby in pbx_config.c

Tested-by: George Joseph
ASTERISK-20127 #close

Review: https://reviewboard.asterisk.org/r/4132/
........

Merged revisions 427275 from http://svn.asterisk.org/svn/asterisk/branches/12
........

Merged revisions 427276 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@427277 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 10 insertions, 0 deletions

diff --git a/include/asterisk/utils.h b/include/asterisk/utils.h
index 464ff1cdc..a0e7cb6bf 100644
--- a/include/asterisk/utils.h
+++ b/include/asterisk/utils.h
@@ -319,6 +319,16 @@ int ast_xml_escape(const char *string, char *outbuf, size_t buflen);
 char *ast_escape_quoted(const char *string, char *outbuf, int buflen);
 
 /*!
+ * \brief Escape semicolons found in a string.
+ *
+ * \param string string to be escaped
+ * \param outbuf resulting escaped string
+ * \param buflen size of output buffer
+ * \return a pointer to the escaped string
+ */
+char *ast_escape_semicolons(const char *string, char *outbuf, int buflen);
+
+/*!
  * \brief Unescape quotes in a string
  *
  * \param quote_str The string with quotes to be unescaped