// vim: ft=c
#include <ttest.h>
#include <string.h>
#include "string.c"

char *lipsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus interdum eros at enim tempus sed.";

char dst[100];

BEFORE()
{
for(int i = 0; i < 100; dst[i++] = '\0');
}

TEST(memcpy_copies_data)
{
  my_memcpy(dst, lipsum, 100);
  ASSERT_EQ_STR(dst, lipsum, 100);
}
TEST(memcpy_doesnt_copy_too_much)
{
  my_memcpy(dst, lipsum, 10);
  ASSERT_EQ_CHR(dst[10], 0);
}

TEST(memset_sets_data)
{
  memset(dst, 0, 10);
  my_memset(dst, 'a', 5);
  ASSERT_EQ_STR(dst, "aaaaa", 100);
}

TEST(memmove_moves_data)
{
  memcpy(&dst[10], "12345", 5);
  my_memmove(dst, &dst[10], 5);
  ASSERT_EQ_STR(dst, "12345", 5);
}
TEST(memmove_handles_overlap)
{
  memcpy(&dst[5], "1234567890", 10);
  my_memmove(dst, &dst[5], 10);
  ASSERT_EQ_STR(dst, "1234567890", 10);
}
TEST(memmove_handles_overlap_the_other_way)
{
  memcpy(dst, "1234567890", 10);
  my_memmove(&dst[5], dst, 10);
  ASSERT_EQ_STR(&dst[5], "1234567890", 10);
}
TEST(memmove_moves_correct_number_of_chars)
{
  memcpy(&dst[5], "1234567890", 10);
  my_memmove(dst, &dst[5], 9);
  ASSERT_EQ_STR(dst, "123456789567890", 15);
}
TEST(memmove_moves_correct_number_of_chars_the_other_way)
{
  memcpy(dst, "1234567890", 10);
  my_memmove(&dst[5], dst, 3);
  ASSERT_EQ_STR(dst, "1234512390", 10);
}

TEST(memcmp_returns_zero_for_equal_strings)
{
  ASSERT_EQ_INT(my_memcmp("1234", "1234", 4), 0);
}
TEST(memcmp_returns_difference_for_unequal_strings)
{
  ASSERT_EQ_INT(my_memcmp("1234", "0234", 4), 1);
}
TEST(memcmp_returns_signed_difference_for_unequal_strings)
{
  ASSERT_EQ_INT(my_memcmp("1234", "1236", 4), -2);
}

TEST(strlen_counts_correctly)
{
  ASSERT_EQ_INT(my_strlen("12345"), 5);
}