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Fix #3525: Make level name matching case-insensitive (#3535)

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Modified from_str() to perform case-insensitive comparison for all level names.
This allows environment variables and SPDLOG_LEVEL_NAMES to use uppercase or
mixed case level names (e.g., DEBUG, INFO, Warning) while maintaining full
backward compatibility with existing lowercase names.
This commit is contained in:
SamareshSingh
2026-02-09 13:58:20 -06:00
committed by GitHub
parent 6c5d63291a
commit 566b2d1404
3 changed files with 60 additions and 3 deletions
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22
include/spdlog/common-inl.h
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@@ -29,15 +29,31 @@ SPDLOG_INLINE const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOE
}
SPDLOG_INLINE spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT {
auto it = std::find(std::begin(level_string_views), std::end(level_string_views), name);
auto it = std::find_if(std::begin(level_string_views), std::end(level_string_views),
[&name](const string_view_t &level_name) {
return level_name.size() == name.size() &&
std::equal(name.begin(), name.end(), level_name.begin(),
[](char a, char b) {
return std::tolower(static_cast<unsigned char>(a)) ==
std::tolower(static_cast<unsigned char>(b));
});
});
if (it != std::end(level_string_views))
return static_cast<level::level_enum>(std::distance(std::begin(level_string_views), it));
// check also for "warn" and "err" before giving up..
if (name == "warn") {
auto iequals = [](const std::string &a, const std::string &b) {
return a.size() == b.size() &&
std::equal(a.begin(), a.end(), b.begin(), [](char ac, char bc) {
return std::tolower(static_cast<unsigned char>(ac)) ==
std::tolower(static_cast<unsigned char>(bc));
});
};
if (iequals(name, "warn")) {
return level::warn;
}
if (name == "err") {
if (iequals(name, "err")) {
return level::err;
}
return level::off;