diff --git a/include/fort.h b/include/fort.h
index f0093aa..e34fd26 100644
--- a/include/fort.h
+++ b/include/fort.h
@@ -244,25 +244,41 @@ FT_EXTERN void ft_destroy_table(FTABLE *table);
 FT_EXTERN void ft_ln(FTABLE *table);
 
 /**
- * Get row number of the current cell
+ * Get row number of the current cell.
  *
  * @param table
  *   Pointer to formatted table.
  * @return
- *   Row number of the current cell
+ *   Row number of the current cell.
  */
 FT_EXTERN size_t ft_cur_row(FTABLE *table);
 
 /**
- * Get column number of the current cell
+ * Get column number of the current cell.
  *
  * @param table
  *   Pointer to formatted table.
  * @return
- *   Column number of the current cell
+ *   Column number of the current cell.
  */
 FT_EXTERN size_t ft_cur_col(FTABLE *table);
 
+/**
+ * Set current cell position.
+ *
+ * Current cell - cell that will be edited with all modifiing functions
+ * (ft_printf, ft_write ...).
+ *
+ * @param table
+ *   Pointer to formatted table.
+ * @param row
+ *   New row number for the current cell.
+ * @param col
+ *   New row number for the current cell.
+ */
+FT_EXTERN void ft_set_cur_cell(FTABLE *table, size_t row, size_t col);
+
+
 
 #if defined(FT_CLANG_COMPILER) || defined(FT_GCC_COMPILER)
 
@@ -287,7 +303,8 @@ FT_EXTERN size_t ft_cur_col(FTABLE *table);
  *   more arguments than required by format, the extraneous arguments are
  *   evaluated and ignored.
  * @return
- *   todo ?????
+ *   - Number of printed cells
+ *   - (<0): In case of error
  */
 FT_EXTERN int ft_printf(FTABLE *table, const char *fmt, ...) FT_PRINTF_ATTRIBUTE_FORMAT(2, 3);
 
@@ -312,7 +329,8 @@ FT_EXTERN int ft_printf(FTABLE *table, const char *fmt, ...) FT_PRINTF_ATTRIBUTE
  *   more arguments than required by format, the extraneous arguments are
  *   evaluated and ignored.
  * @return
- *   todo ?????
+ *   - Number of printed cells.
+ *   - (<0): In case of error.
  */
 FT_EXTERN int ft_printf_ln(FTABLE *table, const char *fmt, ...) FT_PRINTF_ATTRIBUTE_FORMAT(2, 3);
 
@@ -380,8 +398,8 @@ FT_EXTERN int ft_add_separator(FTABLE *table);
  * string with strdup or similar functions.
  *
  * Returned pointer may be later invalidated by:
- * - Calling ft_destroy_table
- * - Other invocations of ft_to_string
+ * - Calling ft_destroy_table;
+ * - Other invocations of ft_to_string.
  *
  * @param table
  *   Formatted table.
@@ -404,7 +422,7 @@ FT_EXTERN const char *ft_to_string(const FTABLE *table);
 
 
 /**
- * Structure describing border appearance
+ * Structure describing border appearance.
  */
 struct ft_border_chars {
     char top_border_ch;
@@ -416,7 +434,7 @@ struct ft_border_chars {
 };
 
 /**
- * Structure describing border style
+ * Structure describing border style.
  */
 struct ft_border_style {
     struct ft_border_chars border_chs;
@@ -425,7 +443,7 @@ struct ft_border_style {
 };
 
 /**
- * Built-in table border styles
+ * Built-in table border styles.
  */
 extern struct ft_border_style *FT_BASIC_STYLE;
 extern struct ft_border_style *FT_SIMPLE_STYLE;
@@ -437,7 +455,7 @@ extern struct ft_border_style *FT_EMPTY_STYLE;
  * Set default border style for all new formatted tables.
  *
  * @param style
- *   Pointer to border style
+ *   Pointer to border style.
  * @return
  *   - 0: Success; default border style was changed.
  *   - (-1): !!!!!!!!  todo
@@ -448,9 +466,9 @@ FT_EXTERN int ft_set_default_border_style(struct ft_border_style *style);
  * Set border style for the table.
  *
  * @param table
- *   A pointer to the FTABLE structure
+ *   A pointer to the FTABLE structure.
  * @param style
- *   Pointer to border style
+ *   Pointer to border style.
  * @return
  *   - 0: Success; table border style was changed.
  *   - (-1): !!!!!!!!  todo
@@ -458,7 +476,7 @@ FT_EXTERN int ft_set_default_border_style(struct ft_border_style *style);
 FT_EXTERN int ft_set_border_style(FTABLE *table, struct ft_border_style *style);
 
 /**
- * Special macros to define cell position (row and column)
+ * Special macros to define cell position (row and column).
  */
 #define FT_ANY_COLUMN    (UINT_MAX)
 #define FT_CUR_COLUMN    (UINT_MAX - 1)
@@ -466,7 +484,7 @@ FT_EXTERN int ft_set_border_style(FTABLE *table, struct ft_border_style *style);
 #define FT_CUR_ROW       (UINT_MAX - 1)
 
 /**
- * Cell options identifiers
+ * Cell options identifiers.
  */
 #define FT_COPT_MIN_WIDTH        (0x01U << 0) /**< Minimum width */
 #define FT_COPT_TEXT_ALIGN       (0x01U << 1) /**< Text alignmemnt */
@@ -478,7 +496,7 @@ FT_EXTERN int ft_set_border_style(FTABLE *table, struct ft_border_style *style);
 #define FT_COPT_ROW_TYPE         (0x01U << 7) /**< Row type */
 
 /**
- * Alignment of cell content
+ * Alignment of cell content.
  */
 enum ft_text_alignment {
     FT_ALIGNED_LEFT,
@@ -487,7 +505,7 @@ enum ft_text_alignment {
 };
 
 /**
- * Type of table row
+ * Type of table row.
  */
 enum ft_row_type {
     FT_ROW_COMMON,
@@ -498,9 +516,9 @@ enum ft_row_type {
  * Set default cell option for all new formatted tables.
  *
  * @param option
- *   Cell option identifier
+ *   Cell option identifier.
  * @param value
- *   Cell option value
+ *   Cell option value.
  * @return
  *   - 0: Success; default cell option was changed.
  *   - (-1): !!!!!!!!  todo
@@ -511,15 +529,15 @@ FT_EXTERN int ft_set_default_cell_option(uint32_t option, int value);
  * Set option for the specified cell of the table.
  *
  * @param table
- *   A pointer to the FTABLE structure
+ *   A pointer to the FTABLE structure.
  * @param row
- *   Cell row
+ *   Cell row.
  * @param col
- *   Cell column
+ *   Cell column.
  * @param option
- *   Cell option identifier
+ *   Cell option identifier.
  * @param value
- *   Cell option value
+ *   Cell option value.
  * @return
  *   - 0: Success; cell option was changed.
  *   - (-1): !!!!!!!!  todo
@@ -527,7 +545,7 @@ FT_EXTERN int ft_set_default_cell_option(uint32_t option, int value);
 FT_EXTERN int ft_set_cell_option(FTABLE *table, size_t row, size_t col, uint32_t option, int value);
 
 /**
- * Table options identifiers
+ * Table options identifiers.
  */
 #define FT_TOPT_LEFT_MARGIN   (0x01U << 0)
 #define FT_TOPT_TOP_MARGIN    (0x01U << 1)
@@ -538,9 +556,9 @@ FT_EXTERN int ft_set_cell_option(FTABLE *table, size_t row, size_t col, uint32_t
  * Set default table option.
  *
  * @param option
- *   Table option identifier
+ *   Table option identifier.
  * @param value
- *   Table option value
+ *   Table option value.
  * @return
  *   - 0: Success; default table option was changed.
  *   - (-1): !!!!!!!!  todo
@@ -551,11 +569,11 @@ FT_EXTERN int ft_set_default_tbl_option(uint32_t option, int value);
  * Set table option.
  *
  * @param table
- *   A pointer to the FTABLE structure
+ *   A pointer to the FTABLE structure.
  * @param option
- *   Table option identifier
+ *   Table option identifier.
  * @param value
- *   Table option value
+ *   Table option value.
  * @return
  *   - 0: Success; default table option was changed.
  *   - (-1): !!!!!!!!  todo
diff --git a/src/fort.c b/src/fort.c
index 5273a49..c7ab551 100644
--- a/src/fort.c
+++ b/src/fort.c
@@ -117,6 +117,14 @@ size_t ft_cur_col(FTABLE *table)
     return table->cur_col;
 }
 
+void ft_set_cur_cell(FTABLE *table, size_t row, size_t col)
+{
+    assert(table);
+    table->cur_row = row;
+    table->cur_col = col;
+}
+
+
 static int ft_row_printf_impl(FTABLE *table, size_t row, const char *fmt, va_list *va)
 {
     size_t i = 0;
@@ -146,15 +154,14 @@ static int ft_row_printf_impl(FTABLE *table, size_t row, const char *fmt, va_lis
             }
         }
     }
-    /* todo: clearing pushed items in case of error */
-    /* todo: this function always create new row, this is not correct, it should be more complicated */
+    /* todo: clearing pushed items in case of error ?? */
 
-    cur_row_p = (fort_row_t **)vector_at(table->rows, row);
-
-    destroy_row(*cur_row_p);
-    *cur_row_p = new_row;
     new_cols = columns_in_row(new_row);
+    cur_row_p = (fort_row_t **)vector_at(table->rows, row);
+    swap_row(*cur_row_p, new_row, table->cur_col);
+
     table->cur_col += new_cols;
+    destroy_row(new_row);
     return new_cols;
 
 clear:
diff --git a/src/row.c b/src/row.c
index 422b6ef..9a2be71 100644
--- a/src/row.c
+++ b/src/row.c
@@ -106,6 +106,22 @@ fort_cell_t *get_cell_and_create_if_not_exists(fort_row_t *row, size_t col)
     return get_cell_implementation(row, col, Create);
 }
 
+fort_status_t swap_row(fort_row_t *cur_row, fort_row_t *ins_row, size_t pos)
+{
+    assert(cur_row);
+    assert(ins_row);
+    size_t cur_sz = vector_size(cur_row->cells);
+    if (cur_sz == 0 && pos == 0) {
+        fort_row_t tmp;
+        memcpy(&tmp, cur_row, sizeof(fort_row_t));
+        memcpy(cur_row, ins_row, sizeof(fort_row_t));
+        memcpy(ins_row, &tmp, sizeof(fort_row_t));
+        return FT_SUCCESS;
+    }
+
+    return vector_swap(cur_row->cells, ins_row->cells, pos);
+}
+
 
 
 
diff --git a/src/row.h b/src/row.h
index 68f3701..dcfdbf7 100644
--- a/src/row.h
+++ b/src/row.h
@@ -30,6 +30,7 @@ fort_cell_t *get_cell_implementation(fort_row_t *row, size_t col, enum PolicyOnN
 fort_cell_t *get_cell(fort_row_t *row, size_t col);
 const fort_cell_t *get_cell_c(const fort_row_t *row, size_t col);
 fort_cell_t *get_cell_and_create_if_not_exists(fort_row_t *row, size_t col);
+fort_status_t swap_row(fort_row_t *cur_row, fort_row_t *ins_row, size_t pos);
 
 
 
diff --git a/src/vector.c b/src/vector.c
index 1353fca..2604c27 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -165,4 +165,50 @@ void *vector_at(vector_t *vector, size_t index)
     return (char *)vector->m_data + index * vector->m_item_size;
 }
 
+fort_status_t vector_swap(vector_t *cur_vec, vector_t *mv_vec, size_t pos)
+{
+    assert(cur_vec);
+    assert(mv_vec);
+    assert(cur_vec->m_item_size == mv_vec->m_item_size);
+
+    size_t cur_sz = vector_size(cur_vec);
+    size_t mv_sz = vector_size(mv_vec);
+    if (mv_sz == 0) {
+        return FT_SUCCESS;
+    }
+
+    size_t min_targ_size = pos + mv_sz;
+    if (cur_sz < min_targ_size) {
+        if (vector_reallocate_(cur_vec, min_targ_size) == -1)
+            return FT_ERROR;
+        cur_vec->m_capacity = min_targ_size;
+    }
+
+    ptrdiff_t deviation = pos * cur_vec->m_item_size;
+    void *tmp = NULL;
+    size_t new_mv_sz = 0;
+    if (cur_sz > pos) {
+        new_mv_sz = MIN(cur_sz - pos, mv_sz);
+        tmp = F_MALLOC(cur_vec->m_item_size * new_mv_sz);
+        if (tmp == NULL) {
+            return FT_MEMORY_ERROR;
+        }
+    }
+
+    memcpy(tmp,
+           cur_vec->m_data + deviation,
+           cur_vec->m_item_size * (cur_sz - pos));
+    memcpy(cur_vec->m_data + deviation,
+           mv_vec->m_data,
+           cur_vec->m_item_size * mv_sz);
+    memcpy(mv_vec->m_data,
+           tmp,
+           cur_vec->m_item_size * new_mv_sz);
+
+    mv_vec->m_size = new_mv_sz;
+    F_FREE(tmp);
+    return FT_SUCCESS;
+}
+
+
 
diff --git a/src/vector.h b/src/vector.h
index a2e765e..7e768a1 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -26,6 +26,7 @@ extern int vector_erase(vector_t*, size_t index);
 extern void vector_clear(vector_t*);
 extern const void *vector_at_c(const vector_t *vector, size_t index);
 extern void* vector_at(vector_t*, size_t index);
+extern fort_status_t vector_swap(vector_t *cur_vec, vector_t *mv_vec, size_t pos);
 
 
 #define FOR_EACH_(type, item, vector, index_name) \
diff --git a/tests/test.c b/tests/test.c
index f9ae571..10684e3 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -3,6 +3,7 @@
 
 struct test_case test_suit [] = {
     {"test_vector_basic", test_vector_basic},
+    {"test_vector_stress", test_vector_stress},
     {"test_string_buffer", test_string_buffer},
     {"test_table_sizes", test_table_sizes},
     {"test_table_geometry", test_table_geometry},
diff --git a/tests/test_table_basic.c b/tests/test_table_basic.c
index d028807..6a429c3 100644
--- a/tests/test_table_basic.c
+++ b/tests/test_table_basic.c
@@ -312,15 +312,21 @@ void test_table_write(void)
         assert_true(ft_write(table, "3.140000") == FT_SUCCESS);
         ft_ln(table);
         assert_true(ft_write(table, "c") == FT_SUCCESS);
-        assert_true(ft_write(table, "234") == FT_SUCCESS);
-        assert_true(ft_write(table, "3.140000") == FT_SUCCESS);
-        assert_true(ft_write_ln(table, "3") == FT_SUCCESS);
+        assert_true(ft_write(table, "235") == FT_SUCCESS);
+        assert_true(ft_write(table, "3.150000") == FT_SUCCESS);
+        assert_true(ft_write_ln(table, "5") == FT_SUCCESS);
 
         assert_true(ft_write(table, "234") == FT_SUCCESS);
         assert_true(ft_write(table, "3.140000") == FT_SUCCESS);
         assert_true(ft_write(table, "3") == FT_SUCCESS);
         assert_true(ft_write_ln(table, "c") == FT_SUCCESS);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        assert_true(ft_write(table, "234") == FT_SUCCESS);
+        assert_true(ft_write(table, "3.140000") == FT_SUCCESS);
+        assert_true(ft_write_ln(table, "3") == FT_SUCCESS);
+
         const char *table_str = ft_to_string(table);
         assert_true(table_str != NULL);
         const char *table_str_etalon =
@@ -354,15 +360,21 @@ void test_table_write(void)
         assert_true(ft_wwrite(table, L"3.140000") == FT_SUCCESS);
         ft_ln(table);
         assert_true(ft_wwrite(table, L"c") == FT_SUCCESS);
-        assert_true(ft_wwrite(table, L"234") == FT_SUCCESS);
-        assert_true(ft_wwrite(table, L"3.140000") == FT_SUCCESS);
-        assert_true(ft_wwrite_ln(table, L"3") == FT_SUCCESS);
+        assert_true(ft_wwrite(table, L"235") == FT_SUCCESS);
+        assert_true(ft_wwrite(table, L"3.150000") == FT_SUCCESS);
+        assert_true(ft_wwrite_ln(table, L"5") == FT_SUCCESS);
 
         assert_true(ft_wwrite(table, L"234") == FT_SUCCESS);
         assert_true(ft_wwrite(table, L"3.140000") == FT_SUCCESS);
         assert_true(ft_wwrite(table, L"3") == FT_SUCCESS);
         assert_true(ft_wwrite_ln(table, L"c") == FT_SUCCESS);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        assert_true(ft_wwrite(table, L"234") == FT_SUCCESS);
+        assert_true(ft_wwrite(table, L"3.140000") == FT_SUCCESS);
+        assert_true(ft_wwrite_ln(table, L"3") == FT_SUCCESS);
+
         const wchar_t *table_str = ft_to_wstring(table);
         assert_true(table_str != NULL);
         const wchar_t *table_str_etalon =
@@ -392,9 +404,13 @@ void test_table_write(void)
         ft_set_cell_option(table, 0, FT_ANY_COLUMN, FT_COPT_ROW_TYPE, FT_ROW_HEADER);
         assert_true(ft_nwrite(table, 4, "3", "c", "234", "3.140000") == FT_SUCCESS);
         ft_ln(table);
-        assert_true(ft_nwrite_ln(table, 4, "c", "234", "3.140000", "3") == FT_SUCCESS);
+        assert_true(ft_nwrite_ln(table, 4, "c", "235", "3.150000", "5") == FT_SUCCESS);
         assert_true(ft_nwrite_ln(table, 4, "234", "3.140000", "3", "c") == FT_SUCCESS);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        assert_true(ft_nwrite_ln(table, 3, "234", "3.140000", "3") == FT_SUCCESS);
+
         const char *table_str = ft_to_string(table);
         assert_true(table_str != NULL);
         const char *table_str_etalon =
@@ -424,9 +440,13 @@ void test_table_write(void)
         ft_set_cell_option(table, 0, FT_ANY_COLUMN, FT_COPT_ROW_TYPE, FT_ROW_HEADER);
         assert_true(ft_nwwrite(table, 4, L"3", L"c", L"234", L"3.140000") == FT_SUCCESS);
         ft_ln(table);
-        assert_true(ft_nwwrite_ln(table, 4, L"c", L"234", L"3.140000", L"3") == FT_SUCCESS);
+        assert_true(ft_nwwrite_ln(table, 4, L"c", L"235", L"3.150000", L"5") == FT_SUCCESS);
         assert_true(ft_nwwrite_ln(table, 4, L"234", L"3.140000", L"3", L"c") == FT_SUCCESS);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        assert_true(ft_nwwrite_ln(table, 3, L"234", L"3.140000", L"3") == FT_SUCCESS);
+
         const wchar_t *table_str = ft_to_wstring(table);
         assert_true(table_str != NULL);
         const wchar_t *table_str_etalon =
@@ -456,13 +476,19 @@ void test_table_write(void)
 
         ft_set_cell_option(table, 0, FT_ANY_COLUMN, FT_COPT_ROW_TYPE, FT_ROW_HEADER);
         const char *row_0[4] = {"3", "c", "234", "3.140000"};
-        const char *row_1[4] = {"c", "234", "3.140000", "3"};
+        const char *row_1[4] = {"c", "235", "3.150000", "5"};
         const char *row_2[4] = {"234", "3.140000", "3", "c"};
         assert_true(ft_row_write_ln(table, 4, row_0) == FT_SUCCESS);
         assert_true(ft_row_write(table, 4, row_1) == FT_SUCCESS);
         ft_ln(table);
         assert_true(ft_row_write_ln(table, 4, row_2) == FT_SUCCESS);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        const char *row_11[3] = {"234", "3.140000", "3"};
+        assert_true(ft_row_write(table, 3, row_11) == FT_SUCCESS);
+        ft_ln(table);
+
         const char *table_str = ft_to_string(table);
         assert_true(table_str != NULL);
         const char *table_str_etalon =
@@ -491,13 +517,19 @@ void test_table_write(void)
 
         ft_set_cell_option(table, 0, FT_ANY_COLUMN, FT_COPT_ROW_TYPE, FT_ROW_HEADER);
         const wchar_t *row_0[4] = {L"3", L"c", L"234", L"3.140000"};
-        const wchar_t *row_1[4] = {L"c", L"234", L"3.140000", L"3"};
+        const wchar_t *row_1[4] = {L"c", L"235", L"3.150000", L"5"};
         const wchar_t *row_2[4] = {L"234", L"3.140000", L"3", L"c"};
         assert_true(ft_row_wwrite_ln(table, 4, row_0) == FT_SUCCESS);
         assert_true(ft_row_wwrite(table, 4, row_1) == FT_SUCCESS);
         ft_ln(table);
         assert_true(ft_row_wwrite_ln(table, 4, row_2) == FT_SUCCESS);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        const wchar_t *row_11[3] = {L"234", L"3.140000", L"3"};
+        assert_true(ft_row_wwrite(table, 3, row_11) == FT_SUCCESS);
+        ft_ln(table);
+
         const wchar_t *table_str = ft_to_wstring(table);
         assert_true(table_str != NULL);
         const wchar_t *table_str_etalon =
@@ -528,12 +560,17 @@ void test_table_write(void)
         ft_set_cell_option(table, 0, FT_ANY_COLUMN, FT_COPT_ROW_TYPE, FT_ROW_HEADER);
         int n = ft_printf_ln(table, "%d|%c|%s|%f", 3, 'c', "234", 3.14);
         assert_true(n == 4);
-        n = ft_printf(table, "%c|%s|%f|%d", 'c', "234", 3.14, 3);
+        n = ft_printf(table, "%c|%s|%f|%d", 'c', "235", 3.15, 5);
         assert_true(n == 4);
         ft_ln(table);
         n = ft_printf_ln(table, "%s|%f|%d|%c", "234", 3.14,  3, 'c');
         assert_true(n == 4);
 
+        /* Replace old values */
+        ft_set_cur_cell(table, 1, 1);
+        n = ft_printf(table, "%s|%f|%d", "234", 3.14, 3);
+        assert_true(n == 3);
+
         const char *table_str = ft_to_string(table);
         assert_true(table_str != NULL);
         const char *table_str_etalon =
diff --git a/tests/test_vector.c b/tests/test_vector.c
index 187ec85..748a2bf 100644
--- a/tests/test_vector.c
+++ b/tests/test_vector.c
@@ -87,3 +87,34 @@ void test_vector_basic(void)
 
     destroy_vector(vector);
 }
+
+
+void test_vector_stress(void)
+{
+    size_t i = 0;
+
+    typedef short item_t;
+    const size_t init_capacity = 10;
+    vector_t *vector = create_vector(sizeof(item_t), init_capacity);
+
+    assert_true(vector != NULL);
+    assert_true(vector_size(vector)     == 0);
+    assert_true(vector_capacity(vector) == init_capacity);
+
+    WHEN("Pushing a lot of items into vector") {
+        for (i = 0; i < 1000 * init_capacity; ++i) {
+            item_t item = (item_t)i;
+            vector_push(vector, &item);
+        }
+
+        THEN("Then capacity is not changed") {
+            assert_true(vector_size(vector)     == 1000 * init_capacity);
+            assert_true(vector_capacity(vector) >= 1000 * init_capacity);
+        }
+    }
+
+    /*
+     * Destroy without previously called clear
+     */
+    destroy_vector(vector);
+}
diff --git a/tests/tests.h b/tests/tests.h
index 9059908..138fcbb 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -15,6 +15,7 @@
 
 /* Test cases */
 void test_vector_basic(void);
+void test_vector_stress(void);
 void test_string_buffer(void);
 void test_table_sizes(void);
 void test_table_geometry(void);