tests/join/tests_for_freeline.c

#include "../../unity/unity.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

void setUp(void) {
  /* Setup code here, or leave empty */
}

void tearDown(void) {
  /* Cleanup code here, or leave empty */
}

/* Helper to allocate and zero a struct line */
static struct line* alloc_zeroed_line(void) {
  struct line* l = (struct line*)malloc(sizeof(struct line));
  TEST_ASSERT_NOT_NULL(l);
  memset(l, 0, sizeof(*l));
  return l;
}

void test_freeline_null_pointer_ok(void) {
  /* Should not crash or modify anything when given NULL */
  freeline(NULL);
  /* If we got here, no crash; record a trivial assertion */
  TEST_ASSERT_TRUE(1);
}

void test_freeline_frees_and_nulls_members(void) {
  struct line* l = alloc_zeroed_line();

  /* Simulate populated fields and buffer */
  l->nfields = 3;
  l->nfields_allocated = 3;
  l->fields = (struct field*)malloc(sizeof(struct field) * 3);
  TEST_ASSERT_NOT_NULL(l->fields);

  /* Field contents don't matter to freeline; avoid extra allocations */
  for (int i = 0; i < 3; i++) {
    l->fields[i].beg = NULL;
    l->fields[i].len = 0;
  }

  l->buf.buffer = (char*)malloc(16);
  TEST_ASSERT_NOT_NULL(l->buf.buffer);
  memset(l->buf.buffer, 'X', 16);
  l->buf.length = 16;

  freeline(l);

  /* After freeline: pointers are NULLed; counters/length unchanged */
  TEST_ASSERT_NULL(l->fields);
  TEST_ASSERT_NULL(l->buf.buffer);
  TEST_ASSERT_EQUAL_INT(3, (int)l->nfields);
  TEST_ASSERT_EQUAL_INT(3, (int)l->nfields_allocated);
  TEST_ASSERT_EQUAL_INT(16, (int)l->buf.length);

  free(l);
}

void test_freeline_idempotent_on_same_line(void) {
  struct line* l = alloc_zeroed_line();

  l->fields = (struct field*)malloc(sizeof(struct field));
  TEST_ASSERT_NOT_NULL(l->fields);
  l->nfields = 1;
  l->nfields_allocated = 1;

  l->buf.buffer = (char*)malloc(8);
  TEST_ASSERT_NOT_NULL(l->buf.buffer);
  memset(l->buf.buffer, 'Y', 8);
  l->buf.length = 8;

  /* First call frees and NULLs pointers */
  freeline(l);
  TEST_ASSERT_NULL(l->fields);
  TEST_ASSERT_NULL(l->buf.buffer);

  /* Second call should be safe (free(NULL)) and remain NULL */
  freeline(l);
  TEST_ASSERT_NULL(l->fields);
  TEST_ASSERT_NULL(l->buf.buffer);

  free(l);
}

void test_freeline_only_fields_allocated(void) {
  struct line* l = alloc_zeroed_line();

  l->fields = (struct field*)malloc(sizeof(struct field) * 2);
  TEST_ASSERT_NOT_NULL(l->fields);
  l->nfields = 2;
  l->nfields_allocated = 2;

  /* Ensure buffer is NULL/non-allocated */
  l->buf.buffer = NULL;
  l->buf.length = 5; /* length should remain unchanged */

  freeline(l);

  TEST_ASSERT_NULL(l->fields);
  TEST_ASSERT_NULL(l->buf.buffer);
  TEST_ASSERT_EQUAL_INT(2, (int)l->nfields);
  TEST_ASSERT_EQUAL_INT(2, (int)l->nfields_allocated);
  TEST_ASSERT_EQUAL_INT(5, (int)l->buf.length);

  free(l);
}

void test_freeline_only_buffer_allocated(void) {
  struct line* l = alloc_zeroed_line();

  l->fields = NULL;
  l->nfields = 0;
  l->nfields_allocated = 0;

  l->buf.buffer = (char*)malloc(32);
  TEST_ASSERT_NOT_NULL(l->buf.buffer);
  memset(l->buf.buffer, 'Z', 32);
  l->buf.length = 32;

  freeline(l);

  TEST_ASSERT_NULL(l->fields);
  TEST_ASSERT_NULL(l->buf.buffer);
  TEST_ASSERT_EQUAL_INT(0, (int)l->nfields);
  TEST_ASSERT_EQUAL_INT(0, (int)l->nfields_allocated);
  TEST_ASSERT_EQUAL_INT(32, (int)l->buf.length);

  free(l);
}

int main(void) {
  UNITY_BEGIN();

  RUN_TEST(test_freeline_null_pointer_ok);
  RUN_TEST(test_freeline_frees_and_nulls_members);
  RUN_TEST(test_freeline_idempotent_on_same_line);
  RUN_TEST(test_freeline_only_fields_allocated);
  RUN_TEST(test_freeline_only_buffer_allocated);

  return UNITY_END();
}