--- /dev/null
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 700
+#endif
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <math.h>
+#include "test.h"
+
+#define DISABLE_SLOW_TESTS
+
+#define TEST(r, f, x, m) ( \
+ ((r) = (f)) == (x) || \
+ (error("%s failed (" m ")\n", #f, r, x), 0) )
+
+#define TEST_S(s, x, m) ( \
+ !strcmp((s),(x)) || \
+ (error("[%s] != [%s] (%s)\n", s, x, m), 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, "" },
+
+ /* ...but it still has to honor width and flags. */
+ { "%2.0u", 0, " " },
+ { "%02.0u", 0, " " },
+ { "%2.0d", 0, " " },
+ { "%02.0d", 0, " " },
+ { "% .0d", 0, " " },
+ { "%+.0d", 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 */
+ { "%a", 0.0, "0x0p+0" },
+ { "%e", 0.0, "0.000000e+00" },
+ { "%f", 0.0, "0.000000" },
+ { "%g", 0.0, "0" },
+ { "%#g", 0.0, "0.00000" },
+ { "%la", 0.0, "0x0p+0" },
+ { "%le", 0.0, "0.000000e+00" },
+ { "%lf", 0.0, "0.000000" },
+ { "%lg", 0.0, "0" },
+ { "%#lg", 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" },
+ { "%.4f", 1.06125, "1.0612" },
+ { "%.2f", 1.375, "1.38" },
+ { "%.1f", 1.375, "1.4" },
+ { "%.1lf", 1.375, "1.4" },
+ { "%.15f", 1.1, "1.100000000000000" },
+ { "%.16f", 1.1, "1.1000000000000001" },
+ { "%.17f", 1.1, "1.10000000000000009" },
+ { "%.2e", 1500001.0, "1.50e+06" },
+ { "%.2e", 1505000.0, "1.50e+06" },
+ { "%.2e", 1505000.00000095367431640625, "1.51e+06" },
+ { "%.2e", 1505001.0, "1.51e+06" },
+ { "%.2e", 1506000.0, "1.51e+06" },
+
+ /* 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" },
+ { "%.8g", 0.1, "0.1" },
+ { "%.9g", 0.1, "0.1" },
+ { "%.10g", 0.1, "0.1" },
+ { "%.11g", 0.1, "0.1" },
+
+ /* 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 main(void)
+{
+ int i, j, k;
+ char b[2000];
+
+ 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");
+
+ /* Perform ascii arithmetic to test printing tiny doubles */
+ TEST(i, snprintf(b, sizeof b, "%.1022f", 0x1p-1021), 1024, "%d != %d");
+ b[1] = '0';
+ for (i=0; i<1021; i++) {
+ for (k=0, j=1023; j>0; j--) {
+ if (b[j]<'5') b[j]+=b[j]-'0'+k, k=0;
+ else b[j]+=b[j]-'0'-10+k, k=1;
+ }
+ }
+ TEST(i, b[1], '1', "'%c' != '%c'");
+ for (j=2; b[j]=='0'; j++);
+ TEST(i, j, 1024, "%d != %d");
+
+
+#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++) {
+ i = snprintf(b, sizeof b, int_tests[j].fmt, int_tests[j].i);
+ if (i != strlen(int_tests[j].expect)) {
+ error("snprintf(b, sizeof b, \"%s\", %d) returned %d wanted %d\n",
+ int_tests[j].fmt, int_tests[j].i, i, strlen(int_tests[j].expect));
+ }
+ if (strcmp(b, int_tests[j].expect) != 0)
+ error("bad integer conversion: got \"%s\", want \"%s\"\n", b, int_tests[j].expect);
+ }
+
+ for (j=0; fp_tests[j].fmt; j++) {
+ i = snprintf(b, sizeof b, fp_tests[j].fmt, fp_tests[j].f);
+ if (i != strlen(fp_tests[j].expect)) {
+ error("snprintf(b, sizeof b, \"%s\", %f) returned %d wanted %d\n",
+ fp_tests[j].fmt, fp_tests[j].f, i, strlen(fp_tests[j].expect));
+ }
+ if (strcmp(b, fp_tests[j].expect) != 0)
+ error("bad floating-point conversion: got \"%s\", want \"%s\"\n", b, fp_tests[j].expect);
+ }
+
+ TEST(i, snprintf(0, 0, "%.4a", 1.0), 11, "%d != %d");
+ return test_status;
+}
projects / libc-test / blobdiff