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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#define TEST(r, f, x, m) ( \
((r) = (f)) == (x) || \
(printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x), err++, 0) )
#define TEST_S(s, x, m) ( \
!strcmp((s),(x)) || \
(printf(__FILE__ ":%d: [%s] != [%s] (%s)\n", __LINE__, s, x, m), err++, 0) )
static const struct {
const char *fmt;
int i;
const char *expect;
} int_tests[] = {
/* width, precision, alignment */
{ "%04d", 12, "0012" },
{ "%.3d", 12, "012" },
{ "%3d", 12, " 12" },
{ "%-3d", 12, "12 " },
{ "%+3d", 12, "+12" },
{ "%+-5d", 12, "+12 " },
{ "%+- 5d", 12, "+12 " },
{ "%- 5d", 12, " 12 " },
{ "% d", 12, " 12" },
{ "%0-5d", 12, "12 " },
{ "%-05d", 12, "12 " },
/* ...explicit precision of 0 shall be no characters. */
{ "%.0d", 0, "" },
{ "%.0o", 0, "" },
{ "%#.0d", 0, "" },
{ "%#.0o", 0, "" },
{ "%#.0x", 0, "" },
/* hex: test alt form and case */
{ "%x", 63, "3f" },
{ "%#x", 63, "0x3f" },
{ "%X", 63, "3F" },
/* octal: test alt form */
{ "%o", 15, "17" },
{ "%#o", 15, "017" },
{ NULL, 0.0, NULL }
};
static const struct {
const char *fmt;
double f;
const char *expect;
} fp_tests[] = {
/* basic form, handling of exponent/precision for 0 */
{ "%e", 0.0, "0.000000e+00" },
{ "%f", 0.0, "0.000000" },
{ "%g", 0.0, "0" },
{ "%#g", 0.0, "0.00000" },
/* rounding */
{ "%f", 1.1, "1.100000" },
{ "%f", 1.2, "1.200000" },
{ "%f", 1.3, "1.300000" },
{ "%f", 1.4, "1.400000" },
{ "%f", 1.5, "1.500000" },
/* correctness in DBL_DIG places */
{ "%.15g", 1.23456789012345, "1.23456789012345" },
/* correct choice of notation for %g */
{ "%g", 0.0001, "0.0001" },
{ "%g", 0.00001, "1e-05" },
{ "%g", 123456, "123456" },
{ "%g", 1234567, "1.23457e+06" },
{ "%.7g", 1234567, "1234567" },
{ "%.7g", 12345678, "1.234568e+07" },
/* pi in double precision, printed to a few extra places */
{ "%.15f", M_PI, "3.141592653589793" },
{ "%.18f", M_PI, "3.141592653589793116" },
/* exact conversion of large integers */
{ "%.0f", 340282366920938463463374607431768211456.0,
"340282366920938463463374607431768211456" },
{ NULL, 0.0, NULL }
};
int test_snprintf(void)
{
int i, j;
int err=0;
char b[500], *s;
TEST(i, snprintf(0, 0, "%d", 123456), 6, "length returned %d != %d");
TEST(i, snprintf(0, 0, "%.4s", "hello"), 4, "length returned %d != %d");
TEST(i, snprintf(b, 0, "%.0s", "goodbye"), 0, "length returned %d != %d");
strcpy(b, "xxxxxxxx");
TEST(i, snprintf(b, 4, "%d", 123456), 6, "length returned %d != %d");
TEST_S(b, "123", "incorrect output");
TEST(i, b[5], 'x', "buffer overrun");
#ifndef DISABLE_SLOW_TESTS
errno = 0;
TEST(i, snprintf(NULL, 0, "%.*u", 2147483647, 0), 2147483647, "cannot print max length %d");
TEST(i, snprintf(NULL, 0, "%.*u ", 2147483647, 0), -1, "integer overflow %d");
TEST(i, errno, EOVERFLOW, "after overflow: %d != %d");
#endif
for (j=0; int_tests[j].fmt; j++) {
TEST(i, snprintf(b, sizeof b, int_tests[j].fmt, int_tests[j].i), strlen(b), "%d != %d");
TEST_S(b, int_tests[j].expect, "bad integer conversion");
}
for (j=0; fp_tests[j].fmt; j++) {
TEST(i, snprintf(b, sizeof b, fp_tests[j].fmt, fp_tests[j].f), strlen(b), "%d != %d");
TEST_S(b, fp_tests[j].expect, "bad floating point conversion");
}
return err;
}
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