1 files changed, 56 insertions, 0 deletions
diff --git a/src/utilities.c b/src/utilities.c
new file mode 100644
index 0000000..1142ec4
--- /dev/null
+++ b/src/utilities.c
@@ -0,0 +1,56 @@
+#include "utilities.h"
+#include <string.h>
+#include <time.h>
+
+static unsigned int random_number(unsigned int max)
+{
+    return rand() / (RAND_MAX / max);
+}
+
+void shuffle(void *base, size_t nitems, size_t size)
+{
+    char *c_base = base;
+    char swap[size];
+    for (int i = 0; i < nitems; i++)
+    {
+        char *a = c_base + (i * size);
+        char *b = c_base + (random_number(nitems - 1) * size);
+        memcpy(swap, a, size);
+        memcpy(a, b, size);
+        memcpy(b, swap, size);
+    }
+}
+
+void init2d(void **array, size_t width, size_t height, size_t size)
+{
+    char **c_array = (char **)array;
+    char *start = (char *)array;
+    for (size_t x = 0; x < width; x++)
+        c_array[x] = start + (width * sizeof(int *)) + (x * height * size);
+}
+
+size_t sizeof_2d(size_t width, size_t height, size_t size)
+{
+    return (width * sizeof(char *)) + (width * height * size);
+}
+
+/*
+ * Find left and right ints.
+ */
+int find_lr_ints(char *text, char **left, char **right)
+{
+    *left = text;
+    while (**left != 0 && (**left < '0' || **left > '9'))
+        (*left)++;
+    if (**left == 0)
+        return 0;
+
+    *right = text + strlen(text);
+    while (**right < '0' || **right > '9')
+        (*right)--;
+
+    while (**right >= '0' && **right <= '9')
+        (*right)--;
+    (*right)++;
+    return 1;
+}
+\ No newline at end of file