Add lwc_string_tolower() API.

2 files changed, 29 insertions, 0 deletions

diff --git a/include/libwapcaplet/libwapcaplet.h b/include/libwapcaplet/libwapcaplet.h
index 4c0fc71..c0e8c29 100644
--- a/include/libwapcaplet/libwapcaplet.h
+++ b/include/libwapcaplet/libwapcaplet.h
@@ -106,6 +106,16 @@ extern lwc_error lwc_intern_substring(lwc_string *str,
                                       lwc_string **ret);
 
 /**
+ * Optain a lowercased lwc_string from given lwc_string.
+ *
+ * @param str  String to create lowercase string from.
+ * @param ret  Pointer to ::lwc_string pointer to fill out.
+ * @return     Result of operation, if not OK then the value pointed
+ *             to by \a ret will not be valid.
+ */
+extern lwc_error lwc_string_tolower(lwc_string *str, lwc_string **ret);
+
+/**
  * Increment the reference count on an lwc_string.
  *
  * This increases the reference count on the given string. You should
diff --git a/src/libwapcaplet.c b/src/libwapcaplet.c
index 9360f23..9521e96 100644
--- a/src/libwapcaplet.c
+++ b/src/libwapcaplet.c
@@ -164,6 +164,25 @@ lwc_intern_substring(lwc_string *str,
 	return lwc_intern_string(CSTR_OF(str) + ssoffset, sslen, ret);
 }
 
+lwc_error
+lwc_string_tolower(lwc_string *str, lwc_string **ret)
+{
+	assert(str);
+	assert(ret);
+
+	/* Internally make use of knowledge that insensitive strings
+	 * are lower case. */
+	if (str->insensitive == NULL) {
+		lwc_error error = lwc__intern_caseless_string(str);
+		if (error != lwc_error_ok) {
+			return error;
+		}
+	}
+
+	*ret = lwc_string_ref(str->insensitive);
+	return lwc_error_ok;
+}
+
 void
 lwc_string_destroy(lwc_string *str)
 {