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coreutils

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

/* Unity hooks */
void setUp(void) {
  /* Setup code here, or leave empty */
}
void tearDown(void) {
  /* Cleanup code here, or leave empty */
}

/* The target function 'max_out' is defined earlier in the same translation unit
   and available here due to source inclusion order. We do not redeclare it. */

static void test_max_out_simple_decimal(void) {
  char fmt[] = "%d";
  int expected = snprintf(NULL, 0, fmt, INT_MAX);
  idx_t got = max_out(fmt);
  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("%d", fmt); /* no mutation expected */
}

static void test_max_out_mutates_u_to_d_and_length_correct(void) {
  char fmt_mutable[] = "%u";
  /* Expected uses %d, since max_out should mutate %u to %d */
  const char expected_fmt[] = "%d";
  int expected = snprintf(NULL, 0, expected_fmt, INT_MAX);

  idx_t got = max_out(fmt_mutable);

  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("%d", fmt_mutable); /* verify mutation */
}

static void test_max_out_with_width_and_zero_flag(void) {
  char fmt[] = "%020d"; /* zero-padded width 20 */
  int expected = snprintf(NULL, 0, fmt, INT_MAX);
  idx_t got = max_out(fmt);
  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("%020d", fmt); /* format should remain unchanged */
}

static void test_max_out_with_precision_and_text(void) {
  char fmt[] = "abc%.12dXYZ";
  int expected = snprintf(NULL, 0, fmt, INT_MAX);
  idx_t got = max_out(fmt);
  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("abc%.12dXYZ", fmt);
}

static void test_max_out_with_literal_percent_and_padding(void) {
  char fmt[] = "%%--%08d--%%";
  int expected = snprintf(NULL, 0, fmt, INT_MAX);
  idx_t got = max_out(fmt);
  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("%%--%08d--%%", fmt);
}

static void test_max_out_i_specifier_behaves_like_d(void) {
  char fmt[] = "%i";
  int expected = snprintf(NULL, 0, fmt, INT_MAX);
  idx_t got = max_out(fmt);
  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("%i", fmt);
}

static void test_max_out_with_left_align_and_text_suffix(void) {
  char fmt[] = "%-10d_end";
  int expected = snprintf(NULL, 0, fmt, INT_MAX);
  idx_t got = max_out(fmt);
  TEST_ASSERT_EQUAL_INT(expected, (int)got);
  TEST_ASSERT_EQUAL_STRING("%-10d_end", fmt);
}

int main(void) {
  UNITY_BEGIN();

  RUN_TEST(test_max_out_simple_decimal);
  RUN_TEST(test_max_out_mutates_u_to_d_and_length_correct);
  RUN_TEST(test_max_out_with_width_and_zero_flag);
  RUN_TEST(test_max_out_with_precision_and_text);
  RUN_TEST(test_max_out_with_literal_percent_and_padding);
  RUN_TEST(test_max_out_i_specifier_behaves_like_d);
  RUN_TEST(test_max_out_with_left_align_and_text_suffix);

  return UNITY_END();
}