Refactored Karatsuba's algorithm and added sample usage

Makefile

@@ -11,7 +11,7 @@ TARGET = usage
 TEST_V_TARGET = test_vector
 TEST_M_TARGET = test_map
 
-LIB_OBJS = $(OBJ_DIR)/vector.o $(OBJ_DIR)/map.o
+LIB_OBJS = $(OBJ_DIR)/vector.o $(OBJ_DIR)/map.o $(OBJ_DIR)/bigint.o
 PROG_OBJS = $(OBJ_DIR)/usage.o
 
 .PHONY: all clean

README.md

@@ -10,11 +10,12 @@ the standard library. It currently features:
 
 - [**Vector**](/docs/vector.md): a growable, contiguous array of homogenous generic data types;  
 - [**Map**](/docs/map.md): an associative array that handles generic heterogenous data types;  
+- [**BigInt**](/docs/bigint.md): a data type for arbitrary large integers.  
 
 ## Usage
 At its simplest, you can use this library as follows:
 
-### `Vector`'s usage
+### `Vector` usage
 
 ```c
 #include <stdio.h>
@@ -51,7 +52,7 @@ int main(void) {
 }
 ```
 
-### `Map`'s usage
+### `Map` usage
 
 ```c
 #include <stdio.h>
@@ -95,6 +96,40 @@ int main(void) {
 }
 ```
 
+### `BigInt` usage
+```c
+#include <stdio.h>
+#include "src/bigint.h"
+
+/*
+ * Compile with: gcc main.c src/bigint.c
+ * Output: 20000! = 1819206320230345134827641...
+ * Time: real 0m5.482s user 0m5.453s sys 0m0.017
+ */
+int main(void) {
+    const int n = 20000;
+    bigint_t *fact = bigint_from_int(1).value.number;
+
+    for (int idx = 2; idx<=n; idx++) {
+        bigint_t *big_idx = bigint_from_int(idx).value.number;
+        bigint_t *partial_fact = bigint_prod(fact, big_idx).value.number;
+
+        bigint_destroy(fact);
+        bigint_destroy(big_idx);
+        fact = partial_fact;
+    }
+
+    printf("%ld! = ", n);
+    bigint_print(fact);
+    printf("\n");
+
+    bigint_destroy(fact);
+    return 0;
+}
+```
+
+
+
 For a more exhaustive example, refer to the `usage.c` file. There, you will find a program with proper error management
 and a sample usage for every available method. To run it, first issue the following command:
 

src/bigint.c

@@ -11,11 +11,19 @@
 
 #define IS_DIGIT(c) ((c) >= '0') && ((c) <= '9')
 
+#define DESTROY_IF(p) \
+    do { \
+        if ((p) && (p) != result.value.number) { \
+            bigint_destroy((p)); \
+            (p) = NULL; \
+        } \
+    } while (0)
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 
-#include "bignum.h"
+#include "bigint.h"
 #include "vector.h"
 
 // Internal methods
@@ -96,6 +104,254 @@ bigint_result_t bigint_from_int(long long value) {
     return result;
 }
 
+/**
+ * bigint_from_string
+ *  @string_num: an array of chars representing a number
+ * 
+ *  Takes a string containing a number and convert it to big integer
+ * 
+ *  Returns a bigint_result_t data type containing a new big integer
+ */
+bigint_result_t bigint_from_string(const char *string_num) {
+    bigint_result_t result = {0};
+
+    if (string_num == NULL || *string_num == 0) {
+        result.status = BIGINT_ERR_INVALID;
+        SET_MSG(result, "Invalid string");
+
+        return result;
+    }
+
+    bigint_t *number = malloc(sizeof(bigint_t));
+    if (number == NULL) {
+        result.status = BIGINT_ERR_ALLOCATE;
+        SET_MSG(result, "Failed to allocate memory for big integer");
+
+        return result;
+    }
+
+    vector_result_t vec_res = vector_new(4, sizeof(int));
+    if (vec_res.status != VECTOR_OK) {
+        free(number);        
+        result.status = BIGINT_ERR_ALLOCATE;
+        COPY_MSG(result, vec_res.message);
+
+        return result;
+    }
+
+    number->digits = vec_res.value.vector;
+
+    number->is_negative = false;
+    if (*string_num == '-') {
+        number->is_negative = true;
+        string_num++;
+    } else if (*string_num == '+') {
+        string_num++;
+    }
+
+    // Check whether the integer is valid or not
+    if (*string_num == '\0') {
+        vector_destroy(number->digits);
+        free(number);
+        result.status = BIGINT_ERR_ALLOCATE;
+        SET_MSG(result, "Invalid integer");
+
+        return result;
+    }
+
+    // Check whether characters are digits
+    for (const char *p = string_num; *p; ++p) {
+        if (!IS_DIGIT((unsigned char)*p)) {
+            vector_destroy(number->digits);
+            free(number);
+            result.status = BIGINT_ERR_INVALID;
+            SET_MSG(result, "Invalid integer");
+
+            return result;
+        }
+    }
+
+    // Skip leading zeros
+    while (*string_num == '0' && *(string_num + 1) != '\0') {
+        string_num++;
+    }
+
+    const size_t number_len = strlen(string_num);
+
+    // Process digits from right to left by chunks of the representation base
+    for (int i = number_len; i > 0; i -= BIGINT_BASE_DIGITS) {
+        const int start = (i - BIGINT_BASE_DIGITS > 0) ? i - BIGINT_BASE_DIGITS : 0;
+        const int chunk_len = (i - start);
+
+        int digit = 0;
+        for (int j = 0; j < chunk_len; j++) {
+            // digit *= 10 + (string_num[start + j] - '0');
+            digit = digit * 10 + (string_num[start + j] - '0');
+        }
+
+        vector_result_t push_res = vector_push(number->digits, &digit);
+        if (push_res.status != VECTOR_OK) {
+            vector_destroy(number->digits);
+            free(number);
+            result.status = BIGINT_ERR_ALLOCATE;
+            COPY_MSG(result, push_res.message);
+
+            return result;
+        }
+    }
+
+    bigint_result_t trim_res = bigint_trim_zeros(number);
+    if (trim_res.status != BIGINT_OK) {
+        vector_destroy(number->digits);
+        free(number);
+
+        return trim_res;
+    }
+
+    result.value.number = number;
+    result.status = BIGINT_OK;
+    SET_MSG(result, "Big integer successfully created");
+
+    return result;
+}
+
+/**
+ * bigint_to_string
+ *  @number: a valid non-null big number
+ * 
+ *  Converts a big integer to a C string
+ *
+ *  Returns a bigint_result_t data type
+ */
+bigint_result_t bigint_to_string(const bigint_t *number) {
+    bigint_result_t result = {0};
+
+    if (number == NULL) {
+        result.status = BIGINT_ERR_INVALID;
+        SET_MSG(result, "Invalid big integer");
+
+        return result;
+    }
+
+    const size_t size = vector_size(number->digits);
+    const size_t max_len = (size * BIGINT_BASE_DIGITS) + 2; // +2 for sign and terminator
+    
+    char *str = malloc(max_len);
+    if (str == NULL) {
+        result.status = BIGINT_ERR_ALLOCATE;
+        SET_MSG(result, "Failed to allocate memory for string");
+
+        return result;
+    }
+
+    char *ptr = str;
+    if (number->is_negative) {
+        *ptr++ = '-';
+    }
+
+    // Print MSB without leading zeros
+    vector_result_t msb_res = vector_get(number->digits, size - 1);
+    if (msb_res.status != VECTOR_OK) {
+        result.status = BIGINT_ERR_INVALID;
+        COPY_MSG(result, msb_res.message);
+
+        return result;
+    }
+
+    int *msb = (int*)msb_res.value.element;
+    ptr += sprintf(ptr, "%d", *msb);
+
+    // Print remaining digits with leading zeros
+    for (int idx = size - 2; idx >= 0; idx--) {
+        vector_result_t digit_res = vector_get(number->digits, idx);
+        if (digit_res.status != VECTOR_OK) {
+            result.status = BIGINT_ERR_INVALID;
+            COPY_MSG(result, digit_res.message);
+
+            return result;
+        }
+
+        int *digit = (int*)digit_res.value.element;
+        ptr += sprintf(ptr, "%09d", *digit);
+    }
+
+    result.value.string_num = str;
+    result.status = BIGINT_OK;
+    SET_MSG(result, "Big integer successfully converted");
+
+    return result;
+}
+
+/**
+ * bigint_clone
+ *  @number: a valid non-null big integer
+ *  
+ *  Clones a big integer
+ * 
+ *  Returns a bigint_result_t data type containing the new big integer
+ */
+bigint_result_t bigint_clone(const bigint_t *number) {
+    bigint_result_t result = {0};
+
+    if (number == NULL) {
+        result.status = BIGINT_ERR_INVALID;
+        SET_MSG(result, "Invalid big integer");
+
+        return result;
+    }
+
+    bigint_t *cloned = malloc(sizeof(bigint_t));
+    if (cloned == NULL) {
+        result.status = BIGINT_ERR_ALLOCATE;
+        SET_MSG(result, "Failed to allocate memory for big integer");
+
+        return result;
+    }
+
+    vector_result_t vec_res = vector_new(vector_size(number->digits), sizeof(int));
+    if (vec_res.status != VECTOR_OK) {
+        free(cloned);
+        result.status = BIGINT_ERR_ALLOCATE;
+        COPY_MSG(result, vec_res.message);
+
+        return result;
+    }
+
+    cloned->digits = vec_res.value.vector;
+    cloned->is_negative = number->is_negative;
+
+    // Copy digits
+    for (size_t idx = 0; idx < vector_size(number->digits); idx++) {
+        vector_result_t get_res = vector_get(number->digits, idx);
+        if (get_res.status != VECTOR_OK) {
+            vector_destroy(cloned->digits);
+            free(cloned);
+            result.status = BIGINT_ERR_INVALID;
+            COPY_MSG(result, get_res.message);
+
+            return result;
+        }
+
+        int *digit = (int*)get_res.value.element;
+        
+        vector_result_t push_res = vector_push(cloned->digits, digit);
+        if (push_res.status != VECTOR_OK) {
+            vector_destroy(cloned->digits);
+            free(cloned);
+            result.status = BIGINT_ERR_INVALID;
+            COPY_MSG(result, push_res.message);
+
+            return result;
+        }
+    }
+
+    result.value.number = cloned;
+    result.status = BIGINT_OK;
+    SET_MSG(result, "Big integer successfully cloned");
+
+    return result;
+}
+
 /**
  * bigint_trim_zeros
  *  @number: a non-null big integer
@@ -1011,360 +1267,83 @@ bigint_result_t bigint_karatsuba(const bigint_t *x, const bigint_t *y) {
     // Split the big integer at approximately half the size of the larger number
     const size_t pivot = (x_size > y_size ? x_size : y_size) / 2;
 
-    // Split x = x1 * BASE^pivot + x0
+    // Results of each step
     bigint_t *x1 = NULL, *x0 = NULL;
-    bigint_result_t x_split_res = bigint_split(x, pivot, &x1, &x0);
+    bigint_t *y1 = NULL, *y0 = NULL;
-    if (x_split_res.status != BIGINT_OK) {
+    bigint_t *z0 = NULL, *z2 = NULL;
-        return x_split_res;
+    bigint_t *x_sum = NULL, *y_sum = NULL;
-    }
+    bigint_t *z1_temp = NULL, *z1_sub1 = NULL, *z1 = NULL;
+    bigint_t *z2_shifted = NULL, *z1_shifted = NULL;
+    bigint_t *temp = NULL, *product = NULL;
+
+    bigint_result_t tmp_res = {0};
+
+    // Split x = x1 * BASE^pivot + x0
+    tmp_res = bigint_split(x, pivot, &x1, &x0);
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
 
     // Split y = y1 * BASE^pivot + y0
-    bigint_t *y1 = NULL, *y0 = NULL;
+    tmp_res = bigint_split(x, pivot, &y1, &y0);
-    bigint_result_t y_split_res = bigint_split(y, pivot, &y1, &y0);
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-    if (y_split_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        
-        return y_split_res;
-    }
 
     // Perform karatsuba's trick
-    bigint_result_t z0_res = bigint_karatsuba(x0, y0); // x0 * y0
+    tmp_res = bigint_karatsuba(x0, y0); // z0 = x0 * y0
-    if (z0_res.status != BIGINT_OK) {
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-        bigint_destroy(x1); bigint_destroy(x0);
+    z0 = tmp_res.value.number;
-        bigint_destroy(y1); bigint_destroy(y0);
 
-        return z0_res;
+    tmp_res = bigint_karatsuba(x1, y1); // z2 = x1 * y1
-    }
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-
+    z2 = tmp_res.value.number;
-    bigint_result_t z2_res = bigint_karatsuba(x1, y1); // x1 * y1
-    if (z2_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0_res.value.number);
-
-        return z2_res;
-    }
-
-    bigint_t *z0 = z0_res.value.number;
-    bigint_t *z2 = z2_res.value.number;
 
     // z1 = (x0 + x1) * (y0 + y1) - z0 - z2
-    bigint_result_t x_sum_res = bigint_add(x0, x1);
+    tmp_res = bigint_add(x0, x1); // x_sum = x0 + x1
-    if (x_sum_res.status != BIGINT_OK) {
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-        bigint_destroy(x1); bigint_destroy(x0);
+    x_sum = tmp_res.value.number;
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
 
-        return x_sum_res;
+    tmp_res = bigint_add(y0, y1); // y_sum = y0 + y1
-    }
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
+    y_sum = tmp_res.value.number;
 
-    bigint_t *x_sum = x_sum_res.value.number;
+    tmp_res = bigint_karatsuba(x_sum, y_sum); // z1_temp = (x0 + x1) * (y0 + y1)
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
+    z1_temp = tmp_res.value.number;
 
-    bigint_result_t y_sum_res = bigint_add(y0, y1);
+    tmp_res = bigint_sub(z1_temp, z0); // z1_sub1 = z1_temp - z0
-    if (y_sum_res.status != BIGINT_OK) {
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-        bigint_destroy(x1); bigint_destroy(x0);
+    z1_sub1 = tmp_res.value.number;
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum);
 
-        return y_sum_res;
+    tmp_res = bigint_sub(z1_sub1, z2); // z1 = z1_sub1 - z2
-    }
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
+    z1 = tmp_res.value.number;
 
-    bigint_t *y_sum = y_sum_res.value.number;
+    tmp_res = bigint_shift_left(z2, 2 * pivot); // z2_shifted = z2 << (2 * pivot)
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
+    z2_shifted = tmp_res.value.number;
 
-    // (x0 + x1) * (y0 + y1)
+    tmp_res = bigint_shift_left(z1, pivot); // z1_shifted = z1 << pivot
-    bigint_result_t z1_temp_res = bigint_karatsuba(x_sum ,y_sum);
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-    if (z1_temp_res.status != BIGINT_OK) {
+    z1_shifted = tmp_res.value.number;
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
 
-        return z1_temp_res;
+    tmp_res = bigint_add(z2_shifted, z1_shifted);
-    }
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
+    temp = tmp_res.value.number;
 
-    bigint_t *z1_temp = z1_temp_res.value.number;
+    tmp_res = bigint_add(temp, z0);
-
+    if (tmp_res.status != BIGINT_OK) { result = tmp_res; goto cleanup; }
-    // z1 = ... - z0
+    product = tmp_res.value.number;
-    bigint_result_t z1_sub1_res = bigint_sub(z1_temp, z0);
-    if (z1_sub1_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
-        bigint_destroy(z1_temp);
-
-        return z1_sub1_res;
-    }
-
-    bigint_t *z1_sub1 = z1_sub1_res.value.number;
-
-    // z1 = ... - z2
-    bigint_result_t z1_sub2_res = bigint_sub(z1_sub1, z2);
-    if (z1_sub2_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
-        bigint_destroy(z1_temp); bigint_destroy(z1_sub1);
-
-        return z1_sub2_res;
-    }
-
-    bigint_t *z1 = z1_sub2_res.value.number;
-
-    // product = z^2 * BASE^(2pivot) + z1 * BASE^pivot + z0
-    bigint_result_t z2_shift_res = bigint_shift_left(z2, 2*pivot);
-    if (z2_shift_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
-        bigint_destroy(z1_temp); bigint_destroy(z1_sub1);
-        bigint_destroy(z1);
-
-        return z2_shift_res;
-    }
-
-    bigint_result_t z1_shift_res = bigint_shift_left(z1, pivot);
-    if (z1_shift_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
-        bigint_destroy(z1_temp); bigint_destroy(z1_sub1);
-        bigint_destroy(z1);
-
-        return z1_shift_res;
-    }
-
-    bigint_t *z2_shifted = z2_shift_res.value.number;
-    bigint_t *z1_shifted = z1_shift_res.value.number;
-
-    bigint_result_t temp_res = bigint_add(z2_shifted, z1_shifted);
-    if (temp_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
-        bigint_destroy(z1_temp); bigint_destroy(z1_sub1);
-        bigint_destroy(z1); bigint_destroy(z2_shifted);
-        bigint_destroy(z1_shifted);
-
-        return temp_res;
-    }
-
-    bigint_t *temp = temp_res.value.number;
-
-    // product = ... + z0
-    bigint_result_t product_res = bigint_add(temp, z0);
-    if (product_res.status != BIGINT_OK) {
-        bigint_destroy(x1); bigint_destroy(x0);
-        bigint_destroy(y1); bigint_destroy(y0);
-        bigint_destroy(z0); bigint_destroy(z2);
-        bigint_destroy(x_sum); bigint_destroy(y_sum);
-        bigint_destroy(z1_temp); bigint_destroy(z1_sub1);
-        bigint_destroy(z1); bigint_destroy(z2_shifted);
-        bigint_destroy(z1_shifted); bigint_destroy(temp);
-
-        return product_res;
-    }
-
-    bigint_t *product = product_res.value.number;
-
-    // Clean allocated numbers
-    bigint_destroy(x1); bigint_destroy(x0);
-    bigint_destroy(y1); bigint_destroy(y0);
-    bigint_destroy(z0); bigint_destroy(z1); bigint_destroy(z2);
-    bigint_destroy(x_sum); bigint_destroy(y_sum);
-    bigint_destroy(z1_temp); bigint_destroy(z1_sub1);
-    bigint_destroy(z2_shifted); bigint_destroy(z1_shifted);
-    bigint_destroy(temp);
 
     result.value.number = product;
     result.status = BIGINT_OK;
     SET_MSG(result, "Product between big integers was successful");
 
-    return result;
+cleanup: // Destroy intermediate allocations except for the product
-}
+    DESTROY_IF(x1); DESTROY_IF(x0);
-
+    DESTROY_IF(y1); DESTROY_IF(y0);
-/**
+    DESTROY_IF(z0); DESTROY_IF(z2);
- * bigint_from_string
+    DESTROY_IF(x_sum); DESTROY_IF(y_sum);
- *  @string_num: an array of chars representing a number
+    DESTROY_IF(z1_temp); DESTROY_IF(z1_sub1); DESTROY_IF(z1);
- * 
+    DESTROY_IF(z2_shifted); DESTROY_IF(z1_shifted);
- *  Takes a string containing a number and convert it to big integer
+    DESTROY_IF(temp);
- * 
- *  Returns a bigint_result_t data type containing a new big integer
- */
-bigint_result_t bigint_from_string(const char *string_num) {
-    bigint_result_t result = {0};
-
-    if (string_num == NULL || *string_num == 0) {
-        result.status = BIGINT_ERR_INVALID;
-        SET_MSG(result, "Invalid string");
-
-        return result;
-    }
-
-    bigint_t *number = malloc(sizeof(bigint_t));
-    if (number == NULL) {
-        result.status = BIGINT_ERR_ALLOCATE;
-        SET_MSG(result, "Failed to allocate memory for big integer");
-
-        return result;
-    }
-
-    vector_result_t vec_res = vector_new(4, sizeof(int));
-    if (vec_res.status != VECTOR_OK) {
-        free(number);        
-        result.status = BIGINT_ERR_ALLOCATE;
-        COPY_MSG(result, vec_res.message);
-
-        return result;
-    }
-
-    number->digits = vec_res.value.vector;
-
-    number->is_negative = false;
-    if (*string_num == '-') {
-        number->is_negative = true;
-        string_num++;
-    } else if (*string_num == '+') {
-        string_num++;
-    }
-
-    // Check whether the integer is valid or not
-    if (*string_num == '\0') {
-        vector_destroy(number->digits);
-        free(number);
-        result.status = BIGINT_ERR_ALLOCATE;
-        SET_MSG(result, "Invalid integer");
-
-        return result;
-    }
-
-    // Check whether characters are digits
-    for (const char *p = string_num; *p; ++p) {
-        if (!IS_DIGIT((unsigned char)*p)) {
-            vector_destroy(number->digits);
-            free(number);
-            result.status = BIGINT_ERR_INVALID;
-            SET_MSG(result, "Invalid integer");
-
-            return result;
-        }
-    }
-
-    // Skip leading zeros
-    while (*string_num == '0' && *(string_num + 1) != '\0') {
-        string_num++;
-    }
-
-    const size_t number_len = strlen(string_num);
-
-    // Process digits from right to left by chunks of the representation base
-    for (int i = number_len; i > 0; i -= BIGINT_BASE_DIGITS) {
-        const int start = (i - BIGINT_BASE_DIGITS > 0) ? i - BIGINT_BASE_DIGITS : 0;
-        const int chunk_len = (i - start);
-
-        int digit = 0;
-        for (int j = 0; j < chunk_len; j++) {
-            // digit *= 10 + (string_num[start + j] - '0');
-            digit = digit * 10 + (string_num[start + j] - '0');
-        }
-
-        vector_result_t push_res = vector_push(number->digits, &digit);
-        if (push_res.status != VECTOR_OK) {
-            vector_destroy(number->digits);
-            free(number);
-            result.status = BIGINT_ERR_ALLOCATE;
-            COPY_MSG(result, push_res.message);
-
-            return result;
-        }
-    }
-
-    bigint_result_t trim_res = bigint_trim_zeros(number);
-    if (trim_res.status != BIGINT_OK) {
-        vector_destroy(number->digits);
-        free(number);
-
-        return trim_res;
-    }
-
-    result.value.number = number;
-    result.status = BIGINT_OK;
-    SET_MSG(result, "Big integer successfully created");
-
-    return result;
-}
-
-/**
- * bigint_clone
- *  @number: a valid non-null big integer
- *  
- *  Clones a big integer
- * 
- *  Returns a bigint_result_t data type containing the new big integer
- */
-bigint_result_t bigint_clone(const bigint_t *number) {
-    bigint_result_t result = {0};
-
-    if (number == NULL) {
-        result.status = BIGINT_ERR_INVALID;
-        SET_MSG(result, "Invalid big integer");
-
-        return result;
-    }
-
-    bigint_t *cloned = malloc(sizeof(bigint_t));
-    if (cloned == NULL) {
-        result.status = BIGINT_ERR_ALLOCATE;
-        SET_MSG(result, "Failed to allocate memory for big integer");
-
-        return result;
-    }
-
-    vector_result_t vec_res = vector_new(vector_size(number->digits), sizeof(int));
-    if (vec_res.status != VECTOR_OK) {
-        free(cloned);
-        result.status = BIGINT_ERR_ALLOCATE;
-        COPY_MSG(result, vec_res.message);
-
-        return result;
-    }
-
-    cloned->digits = vec_res.value.vector;
-    cloned->is_negative = number->is_negative;
-
-    // Copy digits
-    for (size_t idx = 0; idx < vector_size(number->digits); idx++) {
-        vector_result_t get_res = vector_get(number->digits, idx);
-        if (get_res.status != VECTOR_OK) {
-            vector_destroy(cloned->digits);
-            free(cloned);
-            result.status = BIGINT_ERR_INVALID;
-            COPY_MSG(result, get_res.message);
-
-            return result;
-        }
-
-        int *digit = (int*)get_res.value.element;
-        
-        vector_result_t push_res = vector_push(cloned->digits, digit);
-        if (push_res.status != VECTOR_OK) {
-            vector_destroy(cloned->digits);
-            free(cloned);
-            result.status = BIGINT_ERR_INVALID;
-            COPY_MSG(result, push_res.message);
-
-            return result;
-        }
-    }
-
-    result.value.number = cloned;
-    result.status = BIGINT_OK;
-    SET_MSG(result, "Big integer successfully cloned");
 
     return result;
 }
@@ -1395,3 +1374,30 @@ bigint_result_t bigint_destroy(bigint_t *number) {
 
     return result;
 }
+
+/**
+ * bigint_print
+ *  @number: a valid non-null big integer
+ * 
+ *  Prints @number to standard output
+ * 
+ *  Returns a bigint_result_t data type
+ */
+bigint_result_t bigint_print(const bigint_t *number) {
+    bigint_result_t result = {0};
+
+    bigint_result_t num_str_res = bigint_to_string(number);
+    if (num_str_res.status != BIGINT_OK) {
+        return num_str_res;
+    }
+
+    char *number_str = num_str_res.value.string_num;
+    
+    printf("%s", number_str);
+    free(number_str);
+
+    result.status = BIGINT_OK;
+    SET_MSG(result, "Big integer successfully printed");
+
+    return result;
+}

src/bigint.h

@@ -1,5 +1,5 @@
-#ifndef BIGNUM_H
+#ifndef BIGINT_H
-#define BIGNUM_H
+#define BIGINT_H
 
 #define RESULT_MSG_SIZE 64
 
@@ -9,10 +9,9 @@
 #define BIGINT_BASE_DIGITS 9
 
 #include <stdint.h>
+#include <stdbool.h>
 #include "vector.h"
 
-typedef enum { false = 0x0, true } bool;
-
 typedef enum {
     BIGINT_OK = 0x0,
     BIGINT_ERR_ALLOCATE,
@@ -41,12 +40,14 @@ extern "C" {
 
 bigint_result_t bigint_from_int(long long value);
 bigint_result_t bigint_from_string(const char *string_num);
+bigint_result_t bigint_to_string(const bigint_t *number);
 bigint_result_t bigint_clone(const bigint_t *number);
 bigint_result_t bigint_compare(const bigint_t *x, const bigint_t *y);
 bigint_result_t bigint_add(const bigint_t *x, const bigint_t *y);
 bigint_result_t bigint_sub(const bigint_t *x, const bigint_t *y);
 bigint_result_t bigint_prod(const bigint_t *x, const bigint_t *y);
 bigint_result_t bigint_destroy(bigint_t *number);
+bigint_result_t bigint_print(const bigint_t *number);
 
 #ifdef __cplusplus
 }

usage.c

@@ -20,9 +20,12 @@
 
 #include "src/vector.h"
 #include "src/map.h"
+#include "src/bigint.h"
 
 static int vector_usage();
 static int map_usage();
+static int bigint_usage();
+
 static vector_order_t cmp_int_asc(const void *x, const void *y);
 
 int main(void) {
@@ -36,6 +39,11 @@ int main(void) {
     st = map_usage();
     if (st) { return st; }
 
+    SEP(50);
+
+    st = bigint_usage();
+    if (st) { return st; }
+
     return 0;
 }
 
@@ -282,6 +290,8 @@ int map_usage() {
         printf("Map cleared (size should be 0): %zu\n", map_size(map));
     }
 
+    printf("\n");
+
     // Delete the map
     map_result_t del_res = map_destroy(map);
     if (del_res.status != MAP_OK) {
@@ -292,3 +302,73 @@ int map_usage() {
 
     return 0;
 }
+
+int bigint_usage() {
+    // Create a big integer
+    bigint_result_t x_res = bigint_from_string("123456789");
+    if (x_res.status != BIGINT_OK) {
+        printf("Error while creating big number: %s\n", x_res.message);
+
+        return 1;
+    }
+
+    bigint_result_t y_res = bigint_from_string("987654321");
+    if (x_res.status != BIGINT_OK) {
+        printf("Error while creating big number: %s\n", x_res.message);
+
+        return 1;
+    }
+
+    bigint_t *x = x_res.value.number;
+    bigint_t *y = y_res.value.number;
+
+    // Sum two big integers
+    bigint_result_t sum_res = bigint_add(x, y);
+    if (sum_res.status != BIGINT_OK) {
+        printf("Error while summing two big numbers: %s\n", sum_res.message);
+
+        return 1;
+    }
+
+    bigint_t *sum = sum_res.value.number;
+
+    // Print result
+    printf("123456789 + 987654321 (should be 1,111,111,110) = ");
+    bigint_print(sum);
+    printf("\n");
+
+    // Subtract two big integers
+    bigint_result_t diff_res = bigint_sub(x, y);
+    if (diff_res.status != BIGINT_OK) {
+        printf("Error while subtracting two big numbers: %s\n", diff_res.message);
+
+        return 1;
+    }
+
+    bigint_t *diff = diff_res.value.number;
+
+    // Print result
+    printf("123456789 - 987654321 (should be -864,197,532) = ");
+    bigint_print(diff);
+    printf("\n");
+
+    // Multiply two big integers
+    bigint_result_t prod_res = bigint_prod(x, y);
+    if (prod_res.status != BIGINT_OK) {
+        printf("Error while multiplying two big numbers: %s\n", prod_res.message);
+
+        return 1;
+    }
+
+    bigint_t *prod = prod_res.value.number;
+
+    // Print result
+    printf("123456789 * 987654321 (should be 121,932,631,112,635,269) = ");
+    bigint_print(prod);
+    printf("\n");
+
+    bigint_destroy(x); bigint_destroy(y);
+    bigint_destroy(sum); bigint_destroy(diff); bigint_destroy(prod);
+
+    return 0;
+}