#include "config.h"

#include "ntp_stdlib.h"

#include "unity.h"

#ifndef VSNPRINTF_PERCENT_M
// format_errmsg() is normally private to msyslog.c
void format_errmsg(char *, size_t, const char *, int);
#endif


void setUp(void);
void test_msnprintf(void);
void test_msnprintfLiteralPercentm(void);
void test_msnprintfBackslashLiteralPercentm(void);
void test_msnprintfBackslashPercent(void);
void test_msnprintfHangingPercent(void);
void test_format_errmsgHangingPercent(void);
void test_msnprintfNullTarget(void);
void test_msnprintfTruncate(void);


void
setUp(void)
{
	init_lib();

	return;
}


void
test_msnprintf(void) {
#define FMT_PREFIX "msyslog.cpp ENOENT: "
	char	exp_buf[512];
	char	act_buf[512];
	int	exp_cnt;
	int	act_cnt;

	exp_cnt = snprintf(exp_buf, sizeof(exp_buf), FMT_PREFIX "%s",
			   strerror(ENOENT));
	errno = ENOENT;
	act_cnt = msnprintf(act_buf, sizeof(act_buf), FMT_PREFIX "%m");

	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
	TEST_ASSERT_EQUAL_STRING(exp_buf, act_buf);
}

void
test_msnprintfLiteralPercentm(void)
{
	char	exp_buf[32];
	char	act_buf[32];
	int	exp_cnt;
	int	act_cnt;

	exp_cnt = snprintf(exp_buf, sizeof(exp_buf), "%%m");
	errno = ENOENT;
	act_cnt = msnprintf(act_buf, sizeof(act_buf), "%%m");

	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
	TEST_ASSERT_EQUAL_STRING(exp_buf, act_buf);
}

void
test_msnprintfBackslashLiteralPercentm(void) {
	char	exp_buf[32];
	char	act_buf[32];
	int	exp_cnt;
	int	act_cnt;

	exp_cnt = snprintf(exp_buf, sizeof(exp_buf), "\%%m");
	errno = ENOENT;
	act_cnt = msnprintf(act_buf, sizeof(act_buf), "\%%m");

	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
	TEST_ASSERT_EQUAL_STRING(exp_buf, act_buf);
}

void
test_msnprintfBackslashPercent(void) {
	char	exp_buf[32];
	char	act_buf[32];
	int	exp_cnt;
	int	act_cnt;

	exp_cnt = snprintf(exp_buf, sizeof(exp_buf), "\%s",
			   strerror(ENOENT));
	errno = ENOENT;
	act_cnt = msnprintf(act_buf, sizeof(act_buf), "\%m");

	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
	TEST_ASSERT_EQUAL_STRING(exp_buf, act_buf);
}

void
test_msnprintfHangingPercent(void) {
	static char fmt[] = "percent then nul term then non-nul %\0oops!";
	char exp_buf[64];
	char act_buf[64];
	int	exp_cnt;
	int	act_cnt;

	ZERO(exp_buf);
	ZERO(act_buf);
	exp_cnt = snprintf(exp_buf, sizeof(exp_buf), "%s", fmt);
	act_cnt = msnprintf(act_buf, sizeof(act_buf), "%s", fmt);

	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
	TEST_ASSERT_EQUAL_STRING(exp_buf, act_buf);
	TEST_ASSERT_EQUAL_STRING("", act_buf + 1 + strlen(act_buf));
}

void
test_format_errmsgHangingPercent(void) {
#ifndef VSNPRINTF_PERCENT_M
	static char fmt[] = "percent then nul term then non-nul %\0oops!";
	char act_buf[64];

	ZERO(act_buf);
	format_errmsg(act_buf, sizeof(act_buf), fmt, ENOENT);

	TEST_ASSERT_EQUAL_STRING(fmt, act_buf);
	TEST_ASSERT_EQUAL_STRING("", act_buf + 1 + strlen(act_buf));
#else
	TEST_IGNORE_MESSAGE("VSNPRINTF_PERCENT_M is defined")
#endif
}

void
test_msnprintfNullTarget(void) {
	int	exp_cnt;
	int	act_cnt;

	exp_cnt = snprintf(NULL, 0, "%d", 123);
	errno = ENOENT;
	act_cnt = msnprintf(NULL, 0, "%d", 123);

	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
}

void
test_msnprintfTruncate(void) {
	char	undist[] = "undisturbed";
	char	exp_buf[512];
	char	act_buf[512];
	int	exp_cnt;
	int	act_cnt;

	memcpy(exp_buf + 3, undist, sizeof(undist));
	memcpy(act_buf + 3, undist, sizeof(undist));
	exp_cnt = snprintf(exp_buf, 3, "%s", strerror(ENOENT));
	errno = ENOENT;
	act_cnt = msnprintf(act_buf, 3, "%m");

	TEST_ASSERT_EQUAL('\0', exp_buf[2]);
	TEST_ASSERT_EQUAL('\0', act_buf[2]);
	TEST_ASSERT_TRUE(act_cnt > 0);
	TEST_ASSERT_EQUAL(exp_cnt, act_cnt);
	TEST_ASSERT_EQUAL_STRING(exp_buf, act_buf);
	TEST_ASSERT_EQUAL_STRING(exp_buf + 3, undist);
	TEST_ASSERT_EQUAL_STRING(act_buf + 3, undist);
}