Blame src/functional/snprintf.c

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#ifndef _XOPEN_SOURCE
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#define _XOPEN_SOURCE 700
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <math.h>
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#include "test.h"
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#define DISABLE_SLOW_TESTS
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#define TEST(r, f, x, m) ( \
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	((r) = (f)) == (x) || \
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	(t_error("%s failed (" m ")\n", #f, r, x), 0) )
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#define TEST_S(s, x, m) ( \
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	!strcmp((s),(x)) || \
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	(t_error("[%s] != [%s] (%s)\n", s, x, m), 0) )
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static const struct {
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	const char *fmt;
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	int i;
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	const char *expect;
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} int_tests[] = {
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	/* width, precision, alignment */
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	{ "%04d", 12, "0012" },
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	{ "%.3d", 12, "012" },
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	{ "%3d", 12, " 12" },
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	{ "%-3d", 12, "12 " },
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	{ "%+3d", 12, "+12" },
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	{ "%+-5d", 12, "+12  " },
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	{ "%+- 5d", 12, "+12  " },
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	{ "%- 5d", 12, " 12  " },
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	{ "% d", 12, " 12" },
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	{ "%0-5d", 12, "12   " },
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	{ "%-05d", 12, "12   " },
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	/* ...explicit precision of 0 shall be no characters. */
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	{ "%.0d", 0, "" },
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	{ "%.0o", 0, "" },
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	{ "%#.0d", 0, "" },
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	{ "%#.0o", 0, "" },
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	{ "%#.0x", 0, "" },
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	/* ...but it still has to honor width and flags. */
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	{ "%2.0u", 0, "  " },
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	{ "%02.0u", 0, "  " },
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	{ "%2.0d", 0, "  " },
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	{ "%02.0d", 0, "  " },
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	{ "% .0d", 0, " " },
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	{ "%+.0d", 0, "+" },
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	/* hex: test alt form and case */
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	{ "%x", 63, "3f" },
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	{ "%#x", 63, "0x3f" },
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	{ "%X", 63, "3F" },
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	/* octal: test alt form */
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	{ "%o", 15, "17" },
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	{ "%#o", 15, "017" },
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	{ NULL, 0.0, NULL }
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};
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static const struct {
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	const char *fmt;
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	double f;
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	const char *expect;
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} fp_tests[] = {
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	/* basic form, handling of exponent/precision for 0 */
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	{ "%a", 0.0, "0x0p+0" },
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	{ "%e", 0.0, "0.000000e+00" },
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	{ "%f", 0.0, "0.000000" },
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	{ "%g", 0.0, "0" },
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	{ "%#g", 0.0, "0.00000" },
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	{ "%la", 0.0, "0x0p+0" },
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	{ "%le", 0.0, "0.000000e+00" },
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	{ "%lf", 0.0, "0.000000" },
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	{ "%lg", 0.0, "0" },
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	{ "%#lg", 0.0, "0.00000" },
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	/* rounding */
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	{ "%f", 1.1, "1.100000" },
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	{ "%f", 1.2, "1.200000" },
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	{ "%f", 1.3, "1.300000" },
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	{ "%f", 1.4, "1.400000" },
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	{ "%f", 1.5, "1.500000" },
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	{ "%.4f", 1.06125, "1.0612" },
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	{ "%.2f", 1.375, "1.38" },
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	{ "%.1f", 1.375, "1.4" },
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	{ "%.1lf", 1.375, "1.4" },
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	{ "%.15f", 1.1, "1.100000000000000" },
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	{ "%.16f", 1.1, "1.1000000000000001" },
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	{ "%.17f", 1.1, "1.10000000000000009" },
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	{ "%.2e", 1500001.0, "1.50e+06" },
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	{ "%.2e", 1505000.0, "1.50e+06" },
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	{ "%.2e", 1505000.00000095367431640625, "1.51e+06" },
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	{ "%.2e", 1505001.0, "1.51e+06" },
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	{ "%.2e", 1506000.0, "1.51e+06" },
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	/* correctness in DBL_DIG places */
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	{ "%.15g", 1.23456789012345, "1.23456789012345" },
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	/* correct choice of notation for %g */
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	{ "%g", 0.0001, "0.0001" },
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	{ "%g", 0.00001, "1e-05" },
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	{ "%g", 123456, "123456" },
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	{ "%g", 1234567, "1.23457e+06" },
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	{ "%.7g", 1234567, "1234567" },
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	{ "%.7g", 12345678, "1.234568e+07" },
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	{ "%.8g", 0.1, "0.1" },
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	{ "%.9g", 0.1, "0.1" },
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	{ "%.10g", 0.1, "0.1" },
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	{ "%.11g", 0.1, "0.1" },
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	/* pi in double precision, printed to a few extra places */
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	{ "%.15f", M_PI, "3.141592653589793" },
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	{ "%.18f", M_PI, "3.141592653589793116" },
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	/* exact conversion of large integers */
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	{ "%.0f", 340282366920938463463374607431768211456.0,
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	         "340282366920938463463374607431768211456" },
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	{ NULL, 0.0, NULL }
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};
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int main(void)
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{
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	int i, j, k;
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	char b[2000];
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	TEST(i, snprintf(0, 0, "%d", 123456), 6, "length returned %d != %d");
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	TEST(i, snprintf(0, 0, "%.4s", "hello"), 4, "length returned %d != %d");
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	TEST(i, snprintf(b, 0, "%.0s", "goodbye"), 0, "length returned %d != %d");
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	strcpy(b, "xxxxxxxx");
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	TEST(i, snprintf(b, 4, "%d", 123456), 6, "length returned %d != %d");
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	TEST_S(b, "123", "incorrect output");
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	TEST(i, b[5], 'x', "buffer overrun");
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	/* Perform ascii arithmetic to test printing tiny doubles */
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	TEST(i, snprintf(b, sizeof b, "%.1022f", 0x1p-1021), 1024, "%d != %d");
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	b[1] = '0';
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	for (i=0; i<1021; i++) {
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		for (k=0, j=1023; j>0; j--) {
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			if (b[j]<'5') b[j]+=b[j]-'0'+k, k=0;
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			else b[j]+=b[j]-'0'-10+k, k=1;
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		}
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	}
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	TEST(i, b[1], '1', "'%c' != '%c'");
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	for (j=2; b[j]=='0'; j++);
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	TEST(i, j, 1024, "%d != %d");
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#ifndef DISABLE_SLOW_TESTS
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	errno = 0;
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	TEST(i, snprintf(NULL, 0, "%.*u", 2147483647, 0), 2147483647, "cannot print max length %d");
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	TEST(i, snprintf(NULL, 0, "%.*u ", 2147483647, 0), -1, "integer overflow %d");
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	TEST(i, errno, EOVERFLOW, "after overflow: %d != %d");
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#endif
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	for (j=0; int_tests[j].fmt; j++) {
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		i = snprintf(b, sizeof b, int_tests[j].fmt, int_tests[j].i);
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		if (i != strlen(int_tests[j].expect)) {
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			t_error("snprintf(b, sizeof b, \"%s\", %d) returned %d wanted %d\n",
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				int_tests[j].fmt, int_tests[j].i, i, strlen(int_tests[j].expect));
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		}
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		if (strcmp(b, int_tests[j].expect) != 0)
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			t_error("bad integer conversion: got \"%s\", want \"%s\"\n", b, int_tests[j].expect);
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	}
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	for (j=0; fp_tests[j].fmt; j++) {
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		i = snprintf(b, sizeof b, fp_tests[j].fmt, fp_tests[j].f);
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		if (i != strlen(fp_tests[j].expect)) {
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			t_error("snprintf(b, sizeof b, \"%s\", %f) returned %d wanted %d\n",
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				fp_tests[j].fmt, fp_tests[j].f, i, strlen(fp_tests[j].expect));
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		}
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		if (strcmp(b, fp_tests[j].expect) != 0)
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			t_error("bad floating-point conversion: got \"%s\", want \"%s\"\n", b, fp_tests[j].expect);
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	}
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	TEST(i, snprintf(0, 0, "%.4a", 1.0), 11, "%d != %d");
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	return t_status;
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}