add kai_tag_attr_to_dup()

3 files changed, 47 insertions, 21 deletions

diff --git a/src/xml/xml.c b/src/xml/xml.c
index 24d544c..ee3c879 100644
--- a/src/xml/xml.c
+++ b/src/xml/xml.c
@@ -35,18 +35,26 @@ char * kai_tag_get_attr(struct kai_tag_t *t, const char *attr)
 
 
 long kai_tag_attr_to_long(
-	struct kai_tag_t *t, const char *attr, 
-	long base, int *flag)
+	struct kai_tag_t *t, const char *attr, long base)
 {
 	char *val = kai_tag_get_attr(t, attr);
 	if (val == NULL) {
 		/* attribute not present, fall back to base */
-		if (flag != NULL)
-			*flag = 1;
 		return base;
 	}
+	else {
+		return strtol(val, NULL, 10);
+	}
+}
+
 
-	if (flag != NULL)
-		*flag = 0;
-	return strtol(val, NULL, 10);
+char *kai_tag_attr_to_dup(struct kai_tag_t *t, const char *attr)
+{
+	char *val = kai_tag_get_attr(t, attr);
+	if (val == NULL) {
+		return NULL;
+	}
+	else {
+		return strdup(val);
+	}
 }
diff --git a/src/xml/xml.h b/src/xml/xml.h
index ac956aa..4766e2c 100644
--- a/src/xml/xml.h
+++ b/src/xml/xml.h
@@ -14,12 +14,15 @@ struct kai_tag_t * kai_parse_string(const char *str);
 char * kai_tag_get_attr(struct kai_tag_t *t, const char *attr);
 
 
-/* find an attribute and convert to long. if not found, return "base" instead.
- * if flag is not NULL, then it is set to 0 when taking the value from an
- * attribute and 1 when taking the value from "base"
+/* find an attribute and convert to long. 
+ * if not found, return "base" instead.
  */
 long kai_tag_attr_to_long(
-	struct kai_tag_t *t, const char *attr, 
-	long base, int *flag);
+	struct kai_tag_t *t, const char *attr, long base);
+
+/* find an attribute and return a duplicate of the value string, or NULL
+ * if not found.
+ */
+char *kai_tag_attr_to_dup(struct kai_tag_t *t, const char *attr);
 
 #endif
diff --git a/src/xml/xml.test.c b/src/xml/xml.test.c
index 11c85c9..d3b8360 100644
--- a/src/xml/xml.test.c
+++ b/src/xml/xml.test.c
@@ -36,22 +36,37 @@ LILY_TEST("convert xml attribute to long")
 		"<tag attr1=\"10\" qq=\"12\"></tag>"
 	);
 
-	int n = kai_tag_attr_to_long(t, "attr1", 0, NULL);
+	int n = kai_tag_attr_to_long(t, "attr1", 0);
 	CHECK_EQ(n, 10, "%d");
 
-	int m = kai_tag_attr_to_long(t, "attr2", 14, NULL);
+	int m = kai_tag_attr_to_long(t, "attr2", 14);
 	CHECK_EQ(m, 14, "%d");
 
-	int flag = -1;
-	int qq = kai_tag_attr_to_long(t, "qq", 0, &flag);
-	CHECK_EQ(qq, 12, "%d");
-	CHECK_EQ(flag, 0, "%d");
+	kai_tag_destroy(t);
+}
+#include LILY_PUSH_TEST()
 
-	int k = kai_tag_attr_to_long(t, "dne", 22, &flag);
-	CHECK_EQ(k, 22, "%d");
-	CHECK_EQ(flag, 1, "%d");
 
+LILY_TEST("duplicate xml attributes")
+{
+	struct kai_tag_t *t = kai_parse_string(
+		"<tag attr1=\"hello\"></tag>"
+	);
+
+	char *a = kai_tag_attr_to_dup(t, "attr1");
+	char *b = kai_tag_attr_to_dup(t, "attr1");
+	char *c = kai_tag_attr_to_dup(t, "dne");
 	kai_tag_destroy(t);
+
+	REQUIRE_NEQ(a, NULL, "%p");
+	REQUIRE_NEQ(b, NULL, "%p");
+	CHECK_EQ(c, NULL, "%p");
+
+	CHECK_EQS(a, "hello");
+	CHECK_EQS(b, "hello");
+	CHECK_NEQ(a, b, "%p");
+
+	free(a); free(b);
 }
 #include LILY_PUSH_TEST()