logger: Don't store verbose-magic in the log files.

In r399267, the verbose2magic stuff was edited. This time it results
in magic characters in the log files for multiline messages.

In trunk (and 13) this was fixed by the "stripping" of those
characters from multiline messages (in r414798).

This fix is altered to actually strip the characters and not replace
them with blanks.

Review: https://reviewboard.asterisk.org/r/3901/
Review: https://reviewboard.asterisk.org/r/3902/
........

Merged revisions 420897 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 420898 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@420899 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/logger.c

@@ -87,7 +87,7 @@ static int display_callids;
 static void unique_callid_cleanup(void *data);
 
 struct ast_callid {
-    int call_identifier; /* Numerical value of the call displayed in the logs */
+	int call_identifier; /* Numerical value of the call displayed in the logs */
 };
 
 AST_THREADSTORAGE_CUSTOM(unique_callid, NULL, unique_callid_cleanup);
@@ -1179,20 +1179,28 @@ static void ast_log_vsyslog(struct logmsg *msg)
 
 static char *logger_strip_verbose_magic(const char *message, int level)
 {
-	char *p;
-	char *stripped_message = ast_strdup(message);
+	const char *begin, *end;
+	char *stripped_message, *dst;
 	char magic = -(level + 1);
 
-	if (!stripped_message) {
+	if (!(stripped_message = ast_malloc(strlen(message) + 1))) {
 		return NULL;
 	}
 
+	begin = message;
+	dst = stripped_message;
 	do {
-		p = strchr(stripped_message, (char)magic);
-		if (p) {
-			*p++ = ' ';
+		end = strchr(begin, magic);
+		if (end) {
+			size_t len = end - begin;
+			memcpy(dst, begin, len);
+			begin = end + 1;
+			dst += len;
+		} else {
+			strcpy(dst, begin); /* safe */
+			break;
 		}
-	} while (p && *p);
+	} while (1);
 
 	return stripped_message;
 }