dtc: Improve support for string escapes

dtc supports the use of C-style escapes (\n, \t and so forth) in
string property definitions via the data_copy_escape_string()
function.  However, while it supports the most common escape
characters, it doesn't support the full set that C does, which is a
potential gotcha.

Worse, a bug in the lexer means that while data_copy_escape_string()
can handle the \" escape, a string with such an escape won't lex
correctly.

This patch fixes both problems, extending data_copy_escape_string() to
support the missing escapes, and fixing the regex for strings in the
lexer to handle internal escaped quotes.

This also adds a testcase for string escape functionality.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 12 insertions, 0 deletions

diff --git a/data.c b/data.c
index 1836f08..b8c79c1 100644
--- a/data.c
+++ b/data.c
@@ -150,12 +150,24 @@ struct data data_copy_escape_string(char *s, int len)
 		c = s[i++];
 		assert(c);
 		switch (c) {
+		case 'a':
+			q[d.len++] = '\a';
+			break;
+		case 'b':
+			q[d.len++] = '\b';
+			break;
 		case 't':
 			q[d.len++] = '\t';
 			break;
 		case 'n':
 			q[d.len++] = '\n';
 			break;
+		case 'v':
+			q[d.len++] = '\v';
+			break;
+		case 'f':
+			q[d.len++] = '\f';
+			break;
 		case 'r':
 			q[d.len++] = '\r';
 			break;