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Handle negative numbers in print

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This commit is contained in:
Camden Dixie O'Brien
2025-08-10 19:54:58 +01:00
parent 662b99a40f
commit ba0a543a4c
2 changed files with 16 additions and 1 deletions
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8
lib/print.c
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@@ -7,12 +7,18 @@ size_t print(am_t *am, char *buffer, size_t buffer_size)
assert(am->val->is_atom); assert(am->val->is_atom);
assert(am->val->atom.type == ATOM_TYPE_INTEGER); assert(am->val->atom.type == ATOM_TYPE_INTEGER);
size_t i = 0;
int64_t value = am->val->atom.integer; int64_t value = am->val->atom.integer;
if (value < 0) {
buffer[i++] = '-';
value *= -1;
}
int divisor = 10; int divisor = 10;
while (divisor <= value) while (divisor <= value)
divisor *= 10; divisor *= 10;
size_t i = 0;
do { do {
divisor /= 10; divisor /= 10;
const int digit = value / divisor; const int digit = value / divisor;

9
tests/print_tests.c
View File

@@ -50,6 +50,14 @@ static void test_integer_10(void)
TEST_ASSERT_EQUAL_MEMORY("10", buffer, 2); TEST_ASSERT_EQUAL_MEMORY("10", buffer, 2);
} }
static void test_integer_minus_4321(void)
{
am.val = expr_integer(&am, -4321);
const size_t len = print(&am, buffer, BUFFER_SIZE);
TEST_ASSERT_EQUAL(5, len);
TEST_ASSERT_EQUAL_MEMORY("-4321", buffer, 5);
}
int main(void) int main(void)
{ {
UNITY_BEGIN(); UNITY_BEGIN();
@@ -57,5 +65,6 @@ int main(void)
RUN_TEST(test_integer_1234); RUN_TEST(test_integer_1234);
RUN_TEST(test_integer_0); RUN_TEST(test_integer_0);
RUN_TEST(test_integer_10); RUN_TEST(test_integer_10);
RUN_TEST(test_integer_minus_4321);
return UNITY_END(); return UNITY_END();
} }