Started 'bigint_t' implementation

src/bignum.h

@@ -0,0 +1,49 @@
+#ifndef BIGNUM_H
+#define BIGNUM_H
+
+#define RESULT_MSG_SIZE 64
+
+// Big numbers numerical base (10^9)
+#define BIGINT_BASE 1000000000
+// Each digit stores values from 0 to 999,999,999
+#define BIGINT_BASE_DIGITS 9
+
+#include <stdint.h>
+#include "vector.h"
+
+typedef enum { false = 0x0, true } bool;
+
+typedef enum {
+    BIGNUM_OK = 0x0,
+    BIGNUM_ERR_ALLOCATE,
+    BIGNUM_ERR_DIV_BY_ZERO,
+    BIGNUM_ERR_INVALID
+} bignum_status_t;
+
+typedef struct {
+    vector_t *digits;
+    bool is_negative;
+} bigint_t;
+
+typedef struct {
+    bignum_status_t status;
+    uint8_t message[RESULT_MSG_SIZE];
+    union {
+        bigint_t *number;
+        char *string_num;
+    } value;
+} bigint_result_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bigint_result_t bigint_from_int(long long value);
+bigint_result_t bigint_from_string(const char *string_num);
+bigint_result_t bigint_destroy(bigint_t *number);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif