Parse buffer lines

logcat_entry.cpp

@@ -1,11 +1,13 @@
 #include <climits>
+#include <cstring>
 #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(.*)$");
+static const Pcre2Regex LogcatEntryRegex("^\\s*(\\d+)(?:\\.\\d+)?(?:\\s+([\\w\\d._-]+))?\\s+(\\d+)\\s+(\\d+)\\s+([A-Z])\\s+(.+?)\\s*:\\s(.*)$");
+static const Pcre2Regex BufferRegex("^--------- (?:beginning of|switch to) (\\w+)$");
 
 Priority priority_from(char c) {
     switch (c) {
@@ -99,3 +101,29 @@ std::optional<LogcatEntry> try_parse_logcat_entry(char* buf, size_t length, Buff
     };
     return std::move(logcat_entry);
 }
+
+static bool substr_equal(const char* lhs_str, size_t lhs_length, const char* rhs_str) {
+    return lhs_length == strlen(rhs_str) && memcmp(lhs_str, rhs_str, lhs_length * sizeof(char)) == 0;
+}
+
+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];
+    size_t buffer_length = static_cast<size_t>(matches[1].rm_eo - matches[1].rm_so);
+    if (substr_equal(buffer_str, buffer_length, "main")) return Buffer::Main;
+    if (substr_equal(buffer_str, buffer_length, "system")) return Buffer::System;
+    if (substr_equal(buffer_str, buffer_length, "radio")) return Buffer::Radio;
+    if (substr_equal(buffer_str, buffer_length, "events")) return Buffer::Events;
+    if (substr_equal(buffer_str, buffer_length, "crash")) return Buffer::Crash;
+    return Buffer::Unknown;
+}

logcat_entry.h

@@ -37,3 +37,4 @@ Priority priority_from(char c);
 const char* priority_to(Priority priority);
 const char* buffer_to(Buffer buffer);
 std::optional<LogcatEntry> try_parse_logcat_entry(char* buf, size_t length, Buffer buffer);
+std::optional<Buffer> try_parse_buffer(char* buf, size_t length);

logcat_thread.cpp

@@ -162,7 +162,7 @@ void LogcatThread::_handle_line(char* buf, size_t length, bool is_stdout) {
 
     std::optional<LogcatEntry> logcat_entry;
     try {
-        logcat_entry = try_parse_logcat_entry(buf, length, Buffer::Unknown);
+        logcat_entry = try_parse_logcat_entry(buf, length, this->_current_buffer);
     } catch (const std::exception& e) {
         std::string log_entry = format_log(std::string("Failed to parse logcat entry: ") + e.what());
         printf("%s\n", log_entry.c_str());
@@ -172,7 +172,18 @@ void LogcatThread::_handle_line(char* buf, size_t length, bool is_stdout) {
         this->atomic_ring_buffer.put_and_increment_write(std::move(*logcat_entry));
         return;
     }
-    // TODO handle buffers
+    std::optional<Buffer> new_buffer;
+    try {
+        new_buffer = try_parse_buffer(buf, length);
+    } catch (const std::exception& e) {
+        std::string log_entry = format_log(std::string("Failed to parse buffer line: ") + e.what());
+        printf("%s\n", log_entry.c_str());
+        this->atomic_ring_buffer.put_and_increment_write(std::move(log_entry));
+    }
+    if (new_buffer) {
+        this->_current_buffer = *new_buffer;
+        return;
+    }
 
     std::string log_entry = format_log(std::string("Cannot parse logcat stdout: ") + std::string(buf, length));
     printf("%s\n", log_entry.c_str());

logcat_thread.h

@@ -38,6 +38,7 @@ private:
     size_t _stdout_buf_used = 0;
     char _stderr_buf[NEWLINE_BUF_SIZE];
     size_t _stderr_buf_used = 0;
+    Buffer _current_buffer = Buffer::Unknown;
     std::stop_source _stop_source;
     std::thread _thread;
 };