logmeow/logcat_entry.cpp

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#include <climits>
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#include <cstring>
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#include <optional>
#include <stdexcept>
#include "logcat_entry.h"
#include "pcre2_wrapper.h"
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static const Pcre2Regex LogcatEntryRegex("^\\s*(\\d+)(?:\\.\\d+)?(?:\\s+([\\w\\d._-]+))?\\s+(\\d+)\\s+(\\d+)\\s+([A-Z])\\s+(.+?)\\s*:\\s(.*)$");
static const Pcre2Regex BufferRegex("^--------- (?:beginning of|switch to) (\\w+)$");
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const char* to_string(Priority priority) {
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switch (priority) {
case Priority::Verbose: return "Verbose";
case Priority::Debug: return "Debug";
case Priority::Info: return "Info";
case Priority::Warn: return "Warning";
case Priority::Error: return "Error";
case Priority::Fatal: return "Fatal";
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case Priority::Unknown: return "Unknown";
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}
}
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const char* to_string(Buffer buffer) {
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switch (buffer) {
case Buffer::Main: return "Main";
case Buffer::System: return "System";
case Buffer::Radio: return "Radio";
case Buffer::Events: return "Events";
case Buffer::Crash: return "Crash";
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case Buffer::Unknown: return "Unknown";
}
}
static std::string leftpad(const std::string& str, size_t characters) {
return str.size() >= characters
? str
: std::string(characters - str.size(), ' ') + str;
}
static inline char to_char(Priority priority) {
switch (priority) {
case Priority::Verbose: return 'V';
case Priority::Debug: return 'D';
case Priority::Info: return 'I';
case Priority::Warn: return 'W';
case Priority::Error: return 'E';
case Priority::Fatal: return 'F';
case Priority::Unknown: return 'U';
}
}
static inline std::string rightpad(const std::string& str, size_t characters) {
return str.size() >= characters
? str
: str + std::string(characters - str.size(), ' ');
}
std::string to_string(const LogcatEntry& logcat_entry) {
char logcat_style_time_as_str[32] = {0};
struct tm tm;
strftime(logcat_style_time_as_str, 31 * sizeof(char), "%Y-%m-%d %H:%M:%S", localtime_r(&logcat_entry.time, &tm));
return std::string(logcat_style_time_as_str)
+ ' ' + leftpad(logcat_entry.user.value_or(" "), 5)
+ ' ' + leftpad(std::to_string(logcat_entry.pid), 5)
+ ' ' + leftpad(std::to_string(logcat_entry.tid), 5)
+ ' ' + to_char(logcat_entry.priority)
+ ' ' + rightpad(logcat_entry.tag, 5)
+ ": " + logcat_entry.message;
}
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static inline Priority priority_from(char c) {
switch (c) {
case 'V': return Priority::Verbose;
case 'D': return Priority::Debug;
case 'I': return Priority::Info;
case 'W': return Priority::Warn;
case 'E': return Priority::Error;
case 'F': return Priority::Fatal;
default: return Priority::Unknown;
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}
}
static inline long to_long(const char* str, const char* expected_end) {
char* endptr;
errno = 0;
long res = strtol(str, &endptr, 10);
if (endptr != expected_end) {
throw std::invalid_argument(std::string(str) + " has trailing text");
} else if (res == LONG_MAX && errno == ERANGE) {
throw std::overflow_error(std::string(str) + " is too big");
} else if (res == LONG_MIN && errno == ERANGE) {
throw std::underflow_error(std::string(str) + " is too small");
}
return res;
}
static unsigned long long to_unsigned_long_long(const char* str, const char* expected_end) {
char* endptr;
errno = 0;
unsigned long long res = strtoull(str, &endptr, 10);
if (endptr != expected_end) {
throw std::invalid_argument(std::string(str) + " has trailing text");
} else if (res == ULLONG_MAX && errno == ERANGE) {
throw std::overflow_error(std::string(str) + " is too big");
}
return res;
}
std::optional<LogcatEntry> try_parse_logcat_entry(char* buf, size_t length, Buffer buffer) {
regmatch_t matches[8];
matches[0].rm_so = 0;
matches[0].rm_eo = static_cast<regoff_t>(length);
if (static_cast<size_t>(matches[0].rm_eo) != length) {
throw std::range_error("Logcat entry line too long for int");
}
if (!LogcatEntryRegex.match(buf, sizeof(matches) / sizeof(regmatch_t), matches, REG_STARTEND)) {
return std::nullopt;
}
std::optional<std::string> user;
if (matches[2].rm_so > -1 && matches[2].rm_eo > -1) {
user = std::string(&buf[matches[2].rm_so], static_cast<size_t>(matches[2].rm_eo - matches[2].rm_so));
}
// if pcre2 gives us negative offsets then i'll die
LogcatEntry logcat_entry = {
.buffer = buffer,
.time = to_long(&buf[matches[1].rm_so], &buf[matches[1].rm_eo]),
.user = std::move(user),
.pid = to_unsigned_long_long(&buf[matches[3].rm_so], &buf[matches[3].rm_eo]),
.tid = to_unsigned_long_long(&buf[matches[4].rm_so], &buf[matches[4].rm_eo]),
.priority = priority_from(buf[matches[5].rm_so]),
.tag = std::string(&buf[matches[6].rm_so], static_cast<size_t>(matches[6].rm_eo - matches[6].rm_so)),
.message = std::string(&buf[matches[7].rm_so], static_cast<size_t>(matches[7].rm_eo - matches[7].rm_so)),
};
return std::move(logcat_entry);
}
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std::optional<Buffer> try_parse_buffer(char* buf, size_t length) {
regmatch_t matches[2];
matches[0].rm_so = 0;
matches[0].rm_eo = static_cast<regoff_t>(length);
if (static_cast<size_t>(matches[0].rm_eo) != length) {
throw std::range_error("Buffer line too long for int");
}
if (!BufferRegex.match(buf, sizeof(matches) / sizeof(regmatch_t), matches, REG_STARTEND)) {
return std::nullopt;
}
const char* buffer_str = &buf[matches[1].rm_so];
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if (!strncmp(buffer_str, "main", 4)) return Buffer::Main;
if (!strncmp(buffer_str, "system", 6)) return Buffer::System;
if (!strncmp(buffer_str, "radio", 5)) return Buffer::Radio;
if (!strncmp(buffer_str, "events", 6)) return Buffer::Events;
if (!strncmp(buffer_str, "crash", 5)) return Buffer::Crash;
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return Buffer::Unknown;
}
void from_json(const nlohmann::json& j, Buffer& buffer) {
const std::string& str = j.get_ref<const nlohmann::json::string_t&>();
if (str == "UNKNOWN") buffer = Buffer::Unknown;
else if (str == "MAIN") buffer = Buffer::Main;
else if (str == "SYSTEM") buffer = Buffer::System;
else if (str == "RADIO") buffer = Buffer::Radio;
else if (str == "EVENTS") buffer = Buffer::Events;
else if (str == "CRASH") buffer = Buffer::Crash;
else throw std::invalid_argument(std::string("Unknown buffer value: ") + str);
}
void to_json(nlohmann::json& j, const Buffer& buffer) {
switch (buffer) {
case Buffer::Unknown: j = "UNKNOWN"; break;
case Buffer::Main: j = "MAIN"; break;
case Buffer::System: j = "SYSTEM"; break;
case Buffer::Radio: j = "RADIO"; break;
case Buffer::Events: j = "EVENTS"; break;
case Buffer::Crash: j = "CRASH"; break;
}
}
void from_json(const nlohmann::json& j, Priority& priority) {
const std::string& str = j.get_ref<const nlohmann::json::string_t&>();
if (str == "UNKNOWN") priority = Priority::Unknown;
else if (str == "VERBOSE") priority = Priority::Verbose;
else if (str == "DEBUG") priority = Priority::Debug;
else if (str == "INFO") priority = Priority::Info;
else if (str == "WARN") priority = Priority::Warn;
else if (str == "ERROR") priority = Priority::Error;
else if (str == "FATAL") priority = Priority::Fatal;
else throw std::invalid_argument(std::string("Unknown priority value: ") + str);
}
void to_json(nlohmann::json& j, const Priority& priority) {
switch (priority) {
case Priority::Unknown: j = "UNKNOWN"; break;
case Priority::Verbose: j = "VERBOSE"; break;
case Priority::Debug: j = "DEBUG"; break;
case Priority::Info: j = "INFO"; break;
case Priority::Warn: j = "WARN"; break;
case Priority::Error: j = "ERROR"; break;
case Priority::Fatal: j = "FATAL"; break;
}
}