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Merge "Implement C23 printf 'w' length modifiers"

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Treehugger Robot 2023-04-20 23:03:13 +00:00 committed by Gerrit Code Review
commit 8ec9b81378
4 changed files with 208 additions and 0 deletions
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11
libc/stdio/printf_common.h
View file

@ -528,6 +528,17 @@ static int __find_arguments(const CHAR_TYPE* fmt0, va_list ap, union arg** argta
case 'b':
ADDUARG();
break;
case 'w':
n = 0;
ch = *fmt++;
while (is_digit(ch)) {
APPEND_DIGIT(n, ch);
ch = *fmt++;
}
if (n == 64) {
flags |= LLONGINT;
}
goto reswitch;
default: /* "%?" prints ?, unless ? is NUL */
if (ch == '\0') goto done;
break;

28
libc/stdio/vfprintf.cpp
View file

@ -521,6 +521,34 @@ int FUNCTION_NAME(FILE* fp, const CHAR_TYPE* fmt0, va_list ap) {
_umax = UARG();
base = DEC;
goto nosign;
case 'w':
n = 0;
ch = *fmt++;
while (is_digit(ch)) {
APPEND_DIGIT(n, ch);
ch = *fmt++;
}
switch (n) {
case 8: {
flags |= CHARINT;
goto reswitch;
}
case 16: {
flags |= SHORTINT;
goto reswitch;
}
case 32: {
goto reswitch;
}
case 64: {
flags |= LLONGINT;
goto reswitch;
}
default: {
__fortify_fatal("%%w%d is unsupported", n);
break;
}
}
case 'X':
xdigs = xdigs_upper;
goto hex;

28
libc/stdio/vfwprintf.cpp
View file

@ -510,6 +510,34 @@ int FUNCTION_NAME(FILE* fp, const CHAR_TYPE* fmt0, va_list ap) {
_umax = UARG();
base = DEC;
goto nosign;
case 'w':
n = 0;
ch = *fmt++;
while (is_digit(ch)) {
APPEND_DIGIT(n, ch);
ch = *fmt++;
}
switch (n) {
case 8: {
flags |= CHARINT;
goto reswitch;
}
case 16: {
flags |= SHORTINT;
goto reswitch;
}
case 32: {
goto reswitch;
}
case 64: {
flags |= LLONGINT;
goto reswitch;
}
default: {
__fortify_fatal("%%w%d is unsupported", n);
break;
}
}
case 'X':
xdigs = xdigs_upper;
goto hex;

141
tests/stdio_test.cpp
View file

@ -3275,3 +3275,144 @@ TEST(STDIO_TEST, swscanf_b) {
EXPECT_EQ(0, i);
EXPECT_EQ('b', ch);
}
TEST(STDIO_TEST, snprintf_w_base) {
#if defined(__BIONIC__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
#pragma clang diagnostic ignored "-Wconstant-conversion"
char buf[BUFSIZ];
int8_t a = 0b101;
snprintf(buf, sizeof(buf), "<%w8b>", a);
EXPECT_STREQ("<101>", buf);
int8_t b1 = 0xFF;
snprintf(buf, sizeof(buf), "<%w8d>", b1);
EXPECT_STREQ("<-1>", buf);
int8_t b2 = 0x1FF;
snprintf(buf, sizeof(buf), "<%w8d>", b2);
EXPECT_STREQ("<-1>", buf);
int16_t c = 0xFFFF;
snprintf(buf, sizeof(buf), "<%w16i>", c);
EXPECT_STREQ("<-1>", buf);
int32_t d = 021;
snprintf(buf, sizeof(buf), "<%w32o>", d);
EXPECT_STREQ("<21>", buf);
uint32_t e = -1;
snprintf(buf, sizeof(buf), "<%w32u>", e);
EXPECT_STREQ("<4294967295>", buf);
int64_t f = 0x3b;
snprintf(buf, sizeof(buf), "<%w64x>", f);
EXPECT_STREQ("<3b>", buf);
snprintf(buf, sizeof(buf), "<%w64X>", f);
EXPECT_STREQ("<3B>", buf);
#pragma clang diagnostic pop
#else
GTEST_SKIP() << "no %w in glibc";
#endif
}
TEST(STDIO_TEST, snprintf_w_arguments_reordering) {
#if defined(__BIONIC__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
#pragma clang diagnostic ignored "-Wformat-extra-args"
char buf[BUFSIZ];
int32_t a = 0xaaaaaaaa;
int64_t b = 0x11111111'22222222;
int64_t c = 0x33333333'44444444;
int64_t d = 0xaaaaaaaa'aaaaaaaa;
snprintf(buf, sizeof(buf), "<%2$w32b --- %1$w64x>", c, a);
EXPECT_STREQ("<10101010101010101010101010101010 --- 3333333344444444>", buf);
snprintf(buf, sizeof(buf), "<%3$w64b --- %1$w64x --- %2$w64x>", b, c, d);
EXPECT_STREQ(
"<1010101010101010101010101010101010101010101010101010101010101010 --- 1111111122222222 --- "
"3333333344444444>",
buf);
#pragma clang diagnostic pop
#else
GTEST_SKIP() << "no %w in glibc";
#endif
}
TEST(STDIO_TEST, snprintf_invalid_w_width) {
#if defined(__BIONIC__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
char buf[BUFSIZ];
int32_t a = 100;
EXPECT_DEATH(snprintf(buf, sizeof(buf), "%w20d", &a), "%w20 is unsupported");
#pragma clang diagnostic pop
#else
GTEST_SKIP() << "no %w in glibc";
#endif
}
TEST(STDIO_TEST, swprintf_w_base) {
#if defined(__BIONIC__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
#pragma clang diagnostic ignored "-Wconstant-conversion"
wchar_t buf[BUFSIZ];
int8_t a = 0b101;
swprintf(buf, sizeof(buf), L"<%w8b>", a);
EXPECT_EQ(std::wstring(L"<101>"), buf);
int8_t b1 = 0xFF;
swprintf(buf, sizeof(buf), L"<%w8d>", b1);
EXPECT_EQ(std::wstring(L"<-1>"), buf);
int8_t b2 = 0x1FF;
swprintf(buf, sizeof(buf), L"<%w8d>", b2);
EXPECT_EQ(std::wstring(L"<-1>"), buf);
int16_t c = 0xFFFF;
swprintf(buf, sizeof(buf), L"<%w16i>", c);
EXPECT_EQ(std::wstring(L"<-1>"), buf);
int32_t d = 021;
swprintf(buf, sizeof(buf), L"<%w32o>", d);
EXPECT_EQ(std::wstring(L"<21>"), buf);
uint32_t e = -1;
swprintf(buf, sizeof(buf), L"<%w32u>", e);
EXPECT_EQ(std::wstring(L"<4294967295>"), buf);
int64_t f = 0x3b;
swprintf(buf, sizeof(buf), L"<%w64x>", f);
EXPECT_EQ(std::wstring(L"<3b>"), buf);
swprintf(buf, sizeof(buf), L"<%w64X>", f);
EXPECT_EQ(std::wstring(L"<3B>"), buf);
#pragma clang diagnostic pop
#else
GTEST_SKIP() << "no %w in glibc";
#endif
}
TEST(STDIO_TEST, swprintf_w_arguments_reordering) {
#if defined(__BIONIC__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
#pragma clang diagnostic ignored "-Wformat-extra-args"
wchar_t buf[BUFSIZ];
int32_t a = 0xaaaaaaaa;
int64_t b = 0x11111111'22222222;
int64_t c = 0x33333333'44444444;
int64_t d = 0xaaaaaaaa'aaaaaaaa;
swprintf(buf, sizeof(buf), L"<%2$w32b --- %1$w64x>", c, a);
EXPECT_EQ(std::wstring(L"<10101010101010101010101010101010 --- 3333333344444444>"), buf);
swprintf(buf, sizeof(buf), L"<%3$w64b --- %1$w64x --- %2$w64x>", b, c, d);
EXPECT_EQ(std::wstring(L"<1010101010101010101010101010101010101010101010101010101010101010 --- "
L"1111111122222222 --- 3333333344444444>"),
buf);
#pragma clang diagnostic pop
#else
GTEST_SKIP() << "no %w in glibc";
#endif
}
TEST(STDIO_TEST, swprintf_invalid_w_width) {
#if defined(__BIONIC__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-invalid-specifier"
wchar_t buf[BUFSIZ];
int32_t a = 100;
EXPECT_DEATH(swprintf(buf, sizeof(buf), L"%w20d", &a), "%w20 is unsupported");
#pragma clang diagnostic pop
#else
GTEST_SKIP() << "no %w in glibc";
#endif
}