allocate_some_struct

1 files changed, 38 insertions, 0 deletions

diff --git a/csrc/data_struct.c b/csrc/data_struct.c
new file mode 100644
index 0000000..53d8cd3
--- /dev/null
+++ b/csrc/data_struct.c
@@ -0,0 +1,38 @@
+static inline mem_copy_words(void *dst, void *src, size_t n)
+{
+	memcpy(dst, src, n*2);
+}
+
+struct st * allocate_some_struct(int a1, int a2, int a3, int a4)
+{
+	struct st * newst = (struct st *)malloc(a1 * a2 * 2 + 12);
+	newst->f0 = a1;
+	newst->f2 = a2;
+	newst->f4 = a3;
+	newst->f6 = a4;
+	newst->f8 = newst->data;
+}
+
+/* this function looks buggy and can crash the game */
+
+struct st * fcn_00451a97(struct st *a1, struct st *a2, int a3, int a4, int a5, int a6)
+{
+	if (a2 == NULL) {
+		a2 = malloc(a5 * a6 * 2 + 12);
+	}
+	
+	a2->f0 = a5; /* number of words(16b) per block? */
+	a2->f2 = a6; /* number of blocks? */
+	a2->f4 = a2->f6 = 0;
+	a2->f8 = a2->data;
+
+	int16_t *ebx = &a1->f8[a1->f0 * a4 + a3];
+	int16_t *esi = a2->f8;
+
+	for (int i = 0; i < a6; i++) {
+		mem_copy_words(esi, ebx, a5); /* copy a5 words(16b) from ebx to esi */
+		esi = &esi[a5];
+		ebx = &ebx[a1->f0];
+	}
+	return a2;
+}