logmeow/logcat_entry.cpp

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2023-01-19 16:34:03 +00:00
#include <climits>
#include <optional>
#include <stdexcept>
#include "logcat_entry.h"
#include "pcre2_wrapper.h"
const Pcre2Regex LogcatEntryRegex("^\\s*(\\d+)(?:\\.\\d+)?(?:\\s+([\\w\\d._-]+))?\\s+(\\d+)\\s+(\\d+)\\s+([A-Z])\\s+(.+?)\\s*:\\s(.*)$");
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;
}
}
const char* priority_to(Priority priority) {
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";
default: return "Unknown";
}
}
const char* buffer_to(Buffer buffer) {
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";
default: return "Unknown";
}
}
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);
}