Merge tag 'bootconfig-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull bootconfig updates from Masami Hiramatsu:

 - Update the bootconfig parser to stop searching for a value when it
   encounters a newline character

 - Update the tests for bootconfig parser to ensure the good examples to
   be parsed correctly by comparing the expected results

* tag 'bootconfig-v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  bootconfig: Check the parsed output of the good examples
  bootconfig: Terminate value search if it hits a newline

Author: torvalds

Documentation/admin-guide/bootconfig.rst

@@ -20,18 +20,26 @@ Config File Syntax
 
 The boot config syntax is a simple structured key-value. Each key consists
 of dot-connected-words, and key and value are connected by ``=``. The value
-has to be terminated by semi-colon (``;``) or newline (``\n``).
-For array value, array entries are separated by comma (``,``). ::
-
-  KEY[.WORD[...]] = VALUE[, VALUE2[...]][;]
-
-Unlike the kernel command line syntax, spaces are OK around the comma and ``=``.
+string has to be terminated by the following delimiters described below.
 
 Each key word must contain only alphabets, numbers, dash (``-``) or underscore
 (``_``). And each value only contains printable characters or spaces except
 for delimiters such as semi-colon (``;``), new-line (``\n``), comma (``,``),
 hash (``#``) and closing brace (``}``).
 
+If the ``=`` is followed by whitespace up to one of these delimiters, the
+key is assigned an empty value.
+
+For arrays, the array values are comma (``,``) separated, and comments and
+line breaks with newline (``\n``) are allowed between array values for
+readability. Thus the first entry of the array must be on the same line as
+the key.::
+
+  KEY[.WORD[...]] = VALUE[, VALUE2[...]][;]
+
+Unlike the kernel command line syntax, white spaces (including tabs) are
+ignored around the comma and ``=``.
+
 If you want to use those delimiters in a value, you can use either double-
 quotes (``"VALUE"``) or single-quotes (``'VALUE'``) to quote it. Note that
 you can not escape these quotes.
@@ -138,8 +146,8 @@ This is parsed as below::
  foo = value
  bar = 1, 2, 3
 
-Note that you can not put a comment between value and delimiter(``,`` or
-``;``). This means following config has a syntax error ::
+Note that you can NOT put a comment or a newline between value and delimiter
+(``,`` or ``;``). This means following config has a syntax error ::
 
  key = 1 # comment
        ,2

lib/bootconfig.c

@@ -557,17 +557,13 @@ static int __init __xbc_close_brace(char *p)
 /*
  * Return delimiter or error, no node added. As same as lib/cmdline.c,
  * you can use " around spaces, but can't escape " for value.
+ * *@__v must point real value string. (not including spaces before value.)
  */
 static int __init __xbc_parse_value(char **__v, char **__n)
 {
 	char *p, *v = *__v;
 	int c, quotes = 0;
 
-	v = skip_spaces(v);
-	while (*v == '#') {
-		v = skip_comment(v);
-		v = skip_spaces(v);
-	}
 	if (*v == '"' || *v == '\'') {
 		quotes = *v;
 		v++;
@@ -617,6 +613,13 @@ static int __init xbc_parse_array(char **__v)
 		last_parent = xbc_node_get_child(last_parent);
 
 	do {
+		/* Search the next array value beyond comments and empty lines */
+		next = skip_spaces(*__v);
+		while (*next == '#') {
+			next = skip_comment(next);
+			next = skip_spaces(next);
+		}
+		*__v = next;
 		c = __xbc_parse_value(__v, &next);
 		if (c < 0)
 			return c;
@@ -701,9 +704,17 @@ static int __init xbc_parse_kv(char **k, char *v, int op)
 	if (ret)
 		return ret;
 
-	c = __xbc_parse_value(&v, &next);
-	if (c < 0)
-		return c;
+	v = skip_spaces_until_newline(v);
+	/* If there is a comment, this has an empty value. */
+	if (*v == '#') {
+		next = skip_comment(v);
+		*v = '\0';
+		c = '\n';
+	} else {
+		c = __xbc_parse_value(&v, &next);
+		if (c < 0)
+			return c;
+	}
 
 	child = xbc_node_get_child(last_parent);
 	if (child && xbc_node_is_value(child)) {

tools/bootconfig/samples/bad-array-after-comment.bconf

@@ -0,0 +1,4 @@
+# the first array value must be on the same line as the key
+key = # comment
+ value1,
+ value2

tools/bootconfig/samples/bad-array-in-next-line.bconf

@@ -0,0 +1,4 @@
+# the first array value must be on the same line as the key
+key =
+  value1,
+  value2

tools/bootconfig/samples/exp-good-array-space-comment.bconf

@@ -0,0 +1 @@
+key = "value1", "value2", "value3";

tools/bootconfig/samples/exp-good-comment-after-value.bconf

@@ -0,0 +1 @@
+key = "value";

tools/bootconfig/samples/exp-good-mixed-append.bconf

@@ -0,0 +1,2 @@
+key = "foo", "bar";
+keyx.subkey = "value";

tools/bootconfig/samples/exp-good-mixed-kv1.bconf

@@ -0,0 +1,2 @@
+key = "value";
+key.subkey = "another-value";

tools/bootconfig/samples/exp-good-mixed-kv2.bconf

@@ -0,0 +1,2 @@
+key = "another-value";
+key.subkey = "value";

tools/bootconfig/samples/exp-good-mixed-kv3.bconf

@@ -0,0 +1,5 @@
+key = "value";
+key {
+	subkey1;
+	subkey2 = "foo";
+}