Implement C23 scanf 'w' length modifiers
wN: Specifies that a following b, d, i, o, u, x, or X conversion specifier applies to an integer argument with a specific width where N is a positive decimal integer with no leading zeros (the argument will have been promoted according to the integer promotions, but its value shall be converted to the unpromoted type); or that a following n conversion specifier applies to a pointer to an integer type argument with a width of N bits. All minimum-width integer types (7.22.1.2) and exact-width integer types (7.22.1.1) defined in the header <stdint.h> shall be supported. Other supported values of N are implementation-defined.
Bug: b/271903607
Test: adb shell
Change-Id: I595fd2ac7bc40d9fb7f1935b39933a6cc068eeff
diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index b85edfb..c20597b 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -3486,3 +3486,141 @@
GTEST_SKIP() << "no %w in glibc";
#endif
}
+
+TEST(STDIO_TEST, sscanf_w_base) {
+#if defined(__BIONIC__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
+ int8_t a;
+ EXPECT_EQ(1, sscanf("<0b101>", "<%w8b>", &a));
+ EXPECT_EQ(0b101, a);
+ int8_t b1;
+ EXPECT_EQ(1, sscanf("<0xFF>", "<%w8i>", &b1));
+ EXPECT_EQ(-1, b1);
+ int8_t b2;
+ EXPECT_EQ(1, sscanf("<0x1FF>", "<%w8i>", &b2));
+ EXPECT_EQ(-1, b2);
+ int16_t c1;
+ EXPECT_EQ(1, sscanf("<0xFFFF>", "<%w16i>", &c1));
+ EXPECT_EQ(-1, c1);
+ uint16_t c2;
+ EXPECT_EQ(1, sscanf("<64>", "<%w16d>", &c2));
+ EXPECT_EQ(64, c2);
+ int32_t d;
+ EXPECT_EQ(1, sscanf("<021>", "<%w32o>", &d));
+ EXPECT_EQ(021, d);
+ uint32_t e;
+ EXPECT_EQ(1, sscanf("<-1>", "<%w32u>", &e));
+ EXPECT_EQ(4294967295, e);
+ int64_t f;
+ EXPECT_EQ(1, sscanf("<0x3b>", "<%w64x>", &f));
+ EXPECT_EQ(0x3b, f);
+ EXPECT_EQ(1, sscanf("<0x3b>", "<%w64X>", &f));
+ EXPECT_EQ(0x3B, f);
+#pragma clang diagnostic pop
+#else
+ GTEST_SKIP() << "no %w in glibc";
+#endif
+}
+
+TEST(STDIO_TEST, sscanf_w_combination) {
+#if defined(__BIONIC__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat"
+#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
+#pragma clang diagnostic ignored "-Wformat-extra-args"
+ uint32_t a;
+ int64_t b;
+ char c;
+
+ EXPECT_EQ(3, sscanf("<0b10101010101010101010101010101010 0x3333333344444444 1>",
+ "<%w32b %w64x %c>", &a, &b, &c));
+ EXPECT_EQ(0xaaaaaaaa, a);
+ EXPECT_EQ(0x3333333344444444, b);
+ EXPECT_EQ('1', c);
+#pragma clang diagnostic pop
+#else
+ GTEST_SKIP() << "no %w in glibc";
+#endif
+}
+
+TEST(STDIO_TEST, sscanf_invalid_w_width) {
+#if defined(__BIONIC__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
+ int32_t a;
+ EXPECT_DEATH(sscanf("<100>", "<%w20d>", &a), "%w20 is unsupported");
+#pragma clang diagnostic pop
+#else
+ GTEST_SKIP() << "no %w in glibc";
+#endif
+}
+
+TEST(STDIO_TEST, swscanf_w_base) {
+#if defined(__BIONIC__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
+ int8_t a;
+ EXPECT_EQ(1, swscanf(L"<0b101>", L"<%w8b>", &a));
+ EXPECT_EQ(0b101, a);
+ int8_t b1;
+ EXPECT_EQ(1, swscanf(L"<0xFF>", L"<%w8i>", &b1));
+ EXPECT_EQ(-1, b1);
+ int8_t b2;
+ EXPECT_EQ(1, swscanf(L"<0x1FF>", L"<%w8i>", &b2));
+ EXPECT_EQ(-1, b2);
+ int16_t c1;
+ EXPECT_EQ(1, swscanf(L"<0xFFFF>", L"<%w16i>", &c1));
+ EXPECT_EQ(-1, c1);
+ uint16_t c2;
+ EXPECT_EQ(1, swscanf(L"<64>", L"<%w16d>", &c2));
+ EXPECT_EQ(64, c2);
+ int32_t d;
+ EXPECT_EQ(1, swscanf(L"<021>", L"<%w32o>", &d));
+ EXPECT_EQ(021, d);
+ uint32_t e;
+ EXPECT_EQ(1, swscanf(L"<-1>", L"<%w32u>", &e));
+ EXPECT_EQ(4294967295, e);
+ int64_t f;
+ EXPECT_EQ(1, swscanf(L"<0x3b>", L"<%w64x>", &f));
+ EXPECT_EQ(0x3b, f);
+ EXPECT_EQ(1, swscanf(L"<0x3b>", L"<%w64X>", &f));
+ EXPECT_EQ(0x3B, f);
+#pragma clang diagnostic pop
+#else
+ GTEST_SKIP() << "no %w in glibc";
+#endif
+}
+
+TEST(STDIO_TEST, swscanf_w_combination) {
+#if defined(__BIONIC__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat"
+#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
+#pragma clang diagnostic ignored "-Wformat-extra-args"
+ uint32_t a;
+ int64_t b;
+ char c;
+
+ EXPECT_EQ(3, swscanf(L"<0b10101010101010101010101010101010 0x3333333344444444 1>",
+ L"<%w32b %w64x %c>", &a, &b, &c));
+ EXPECT_EQ(0xaaaaaaaa, a);
+ EXPECT_EQ(0x3333333344444444, b);
+ EXPECT_EQ('1', c);
+#pragma clang diagnostic pop
+#else
+ GTEST_SKIP() << "no %w in glibc";
+#endif
+}
+
+TEST(STDIO_TEST, swscanf_invalid_w_width) {
+#if defined(__BIONIC__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
+ int32_t a;
+ EXPECT_DEATH(swscanf(L"<100>", L"<%w20d>", &a), "%w20 is unsupported");
+#pragma clang diagnostic pop
+#else
+ GTEST_SKIP() << "no %w in glibc";
+#endif
+}
\ No newline at end of file