add kai_expand_array

1 files changed, 23 insertions, 0 deletions

diff --git a/src/util/util.c b/src/util/util.c
new file mode 100644
index 0000000..c77b3f4
--- /dev/null
+++ b/src/util/util.c
@@ -0,0 +1,23 @@
+#include <kalmia.h>
+#include <stdint.h>
+#include <stdio.h>
+
+
+void *kai_expand_array(void **array, size_t *count, size_t element_size)
+{
+	size_t new_count = *count + 1;
+	size_t new_size = element_size * new_count;
+	/* cast to uint8_t so we can do pointer arithmetic */
+	uint8_t *new_array = realloc(*array, new_size);
+	if (new_array == NULL) {
+		fprintf(stderr, "[kalmia] ERROR: failed to add %ul bytes to %ul-byte array!\n", 
+			element_size, element_size * *count);
+		return NULL;
+	}
+
+	void *new_element = new_array + (*count * element_size);
+
+	*array = new_array;
+	*count = new_count;
+	return new_element;
+}