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fix buffer overflow on all emphasis flags set (#4498)

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Dominic Pöschko 2025-07-20 19:43:33 +02:00 committed by GitHub
parent 553ec11ec0
commit 35dcc58263
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GPG Key ID: B5690EEEBB952194
2 changed files with 10 additions and 1 deletions
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2
include/fmt/color.h
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@ -430,7 +430,7 @@ template <typename Char> struct ansi_color_escape {
private:
static constexpr size_t num_emphases = 8;
Char buffer[7u + 3u * num_emphases + 1u];
Char buffer[7u + 4u * num_emphases + 1u];
static FMT_CONSTEXPR void to_esc(uint8_t c, Char* out,
char delimiter) noexcept {

9
test/color-test.cc
View File

@ -113,6 +113,15 @@ TEST(color_test, format) {
EXPECT_EQ(fmt::format("{}", fmt::styled("bar", fg(fmt::color::blue) |
fmt::emphasis::underline)),
"\x1b[4m\x1b[38;2;000;000;255mbar\x1b[0m");
EXPECT_EQ(
fmt::format(
"{}", fmt::styled(
"all", fmt::emphasis::bold | fmt::emphasis::faint |
fmt::emphasis::italic |
fmt::emphasis::underline | fmt::emphasis::blink |
fmt::emphasis::reverse | fmt::emphasis::conceal |
fmt::emphasis::strikethrough)),
"\x1b[1m\x1b[2m\x1b[3m\x1b[4m\x1b[5m\x1b[7m\x1b[8m\x1b[9mall\x1b[0m");
}
TEST(color_test, format_to) {