ardupilot/libraries/AP_HAL/tests/test_vsnprintf.cpp

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2019-09-10 23:19:33 -03:00
#include <AP_gtest.h>
#include <AP_HAL/HAL.h>
#include <AP_HAL/Util.h>
const AP_HAL::HAL& hal = AP_HAL::get_HAL();
#define streq(x, y) (!strcmp(x, y))
// from the GNU snprintf manpage:
// The functions snprintf() and vsnprintf() do not write more than size
// bytes (including the terminating null byte ('\0')). If the output was
// truncated due to this limit, then the return value is the number of
// characters (excluding the terminating null byte) which would have been
// written to the final string if enough space had been available. Thus,
// a return value of size or more means that the output was truncated.
TEST(vsnprintf_Test, Basic)
{
char output[300];
{
int bytes_required = hal.util->snprintf(output, ARRAY_SIZE(output), "Fred: %u", 37);
EXPECT_TRUE(streq(output, "Fred: 37"));
EXPECT_EQ(bytes_required, 8);
}
{
int bytes_required = hal.util->snprintf(output, 3, "Fred: %u", 37);
EXPECT_TRUE(streq(output, "Fr"));
EXPECT_EQ(bytes_required, 8);
}
{
snprintf(output, ARRAY_SIZE(output), "0123");
int bytes_required = hal.util->snprintf(output, 0, "Fred: %u", 37);
EXPECT_TRUE(streq(output, "0123"));
EXPECT_EQ(bytes_required, 8);
}
{ // ensure rest of buffer survives
memset(output, 'A', 10);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-truncation"
const int bytes_required = snprintf(output, 5, "012345678");
#pragma GCC diagnostic pop
EXPECT_TRUE(streq(output, "0123"));
EXPECT_EQ(bytes_required, 9);
EXPECT_EQ(output[6], 'A');
}
{ // simple float
const int bytes_required = hal.util->snprintf(output, ARRAY_SIZE(output), "%f", 1/3.0);
EXPECT_EQ(bytes_required, 8);
EXPECT_TRUE(streq(output, "0.333333"));
}
{ // less simple float
const int bytes_required = hal.util->snprintf(output, ARRAY_SIZE(output), "%30.9f", 1/3.0);
EXPECT_EQ(bytes_required, 28);
EXPECT_TRUE(streq(output, " 0.3333333"));
}
{ // simple string
const int bytes_required = hal.util->snprintf(output, ARRAY_SIZE(output), "%s %s %c", "ABC", "DEF", 'x');
EXPECT_EQ(bytes_required, 9);
EXPECT_TRUE(streq(output, "ABC DEF x"));
}
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}
AP_GTEST_MAIN()