Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

toxcore/logger.c

@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later
+ * Copyright © 2016-2018 The TokTok team.
+ * Copyright © 2013-2015 Tox project.
+ */
+
+/**
+ * Text logging abstraction.
+ */
+#include "logger.h"
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ccompat.h"
+
+struct Logger {
+    logger_cb *callback;
+    void *context;
+    void *userdata;
+};
+
+#ifndef NDEBUG
+static const char *logger_level_name(Logger_Level level)
+{
+    switch (level) {
+        case LOGGER_LEVEL_TRACE:
+            return "TRACE";
+
+        case LOGGER_LEVEL_DEBUG:
+            return "DEBUG";
+
+        case LOGGER_LEVEL_INFO:
+            return "INFO";
+
+        case LOGGER_LEVEL_WARNING:
+            return "WARNING";
+
+        case LOGGER_LEVEL_ERROR:
+            return "ERROR";
+    }
+
+    return "<unknown>";
+}
+#endif
+
+non_null(1, 3, 5, 6) nullable(7)
+static void logger_stderr_handler(void *context, Logger_Level level, const char *file, int line, const char *func,
+                                  const char *message, void *userdata)
+{
+#ifndef NDEBUG
+    // GL stands for "global logger".
+    fprintf(stderr, "[GL] %s %s:%d(%s): %s\n", logger_level_name(level), file, line, func, message);
+    fprintf(stderr, "Default stderr logger triggered; aborting program\n");
+    abort();
+#endif
+}
+
+static const Logger logger_stderr = {
+    logger_stderr_handler,
+    nullptr,
+    nullptr,
+};
+
+/*
+ * Public Functions
+ */
+
+Logger *logger_new(void)
+{
+    return (Logger *)calloc(1, sizeof(Logger));
+}
+
+void logger_kill(Logger *log)
+{
+    free(log);
+}
+
+void logger_callback_log(Logger *log, logger_cb *function, void *context, void *userdata)
+{
+    log->callback = function;
+    log->context  = context;
+    log->userdata = userdata;
+}
+
+void logger_write(const Logger *log, Logger_Level level, const char *file, int line, const char *func,
+                  const char *format, ...)
+{
+    if (log == nullptr) {
+        log = &logger_stderr;
+    }
+
+    if (log->callback == nullptr) {
+        return;
+    }
+
+    // Only pass the file name, not the entire file path, for privacy reasons.
+    // The full path may contain PII of the person compiling toxcore (their
+    // username and directory layout).
+    const char *filename = strrchr(file, '/');
+    file = filename != nullptr ? filename + 1 : file;
+#if defined(_WIN32) || defined(__CYGWIN__)
+    // On Windows, the path separator *may* be a backslash, so we look for that
+    // one too.
+    const char *windows_filename = strrchr(file, '\\');
+    file = windows_filename != nullptr ? windows_filename + 1 : file;
+#endif
+
+    // Format message
+    char msg[1024];
+    va_list args;
+    va_start(args, format);
+    vsnprintf(msg, sizeof(msg), format, args);
+    va_end(args);
+
+    log->callback(log->context, level, file, line, func, msg, log->userdata);
+}