src/SDL_log.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 01 Oct 2016 12:28:05 -0700
changeset 10412 a644712b2fb2
parent 9998 f67cf37e9cd4
child 10637 5e3ac176d5a8
permissions -rw-r--r--
Fixed bug 3323 - SDL_LogOutput prints message twice on Windows when linked with libc

Simon Hug

If SDL2 is compiled with HAVE_LIBC on Windows, the SDL_LogOutput function has two ways of printing a message. WriteConsole and fprintf.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "./SDL_internal.h"
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#if defined(__WIN32__) || defined(__WINRT__)
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#include "core/windows/SDL_windows.h"
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#endif
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/* Simple log messages in SDL */
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#include "SDL_error.h"
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#include "SDL_log.h"
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#if HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#if defined(__ANDROID__)
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#include <android/log.h>
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#endif
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#define DEFAULT_PRIORITY                SDL_LOG_PRIORITY_CRITICAL
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#define DEFAULT_ASSERT_PRIORITY         SDL_LOG_PRIORITY_WARN
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#define DEFAULT_APPLICATION_PRIORITY    SDL_LOG_PRIORITY_INFO
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#define DEFAULT_TEST_PRIORITY           SDL_LOG_PRIORITY_VERBOSE
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typedef struct SDL_LogLevel
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{
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    int category;
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    SDL_LogPriority priority;
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    struct SDL_LogLevel *next;
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} SDL_LogLevel;
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/* The default log output function */
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static void SDL_LogOutput(void *userdata,
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                          int category, SDL_LogPriority priority,
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                          const char *message);
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static SDL_LogLevel *SDL_loglevels;
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static SDL_LogPriority SDL_default_priority = DEFAULT_PRIORITY;
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static SDL_LogPriority SDL_assert_priority = DEFAULT_ASSERT_PRIORITY;
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static SDL_LogPriority SDL_application_priority = DEFAULT_APPLICATION_PRIORITY;
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static SDL_LogPriority SDL_test_priority = DEFAULT_TEST_PRIORITY;
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static SDL_LogOutputFunction SDL_log_function = SDL_LogOutput;
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static void *SDL_log_userdata = NULL;
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static const char *SDL_priority_prefixes[SDL_NUM_LOG_PRIORITIES] = {
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    NULL,
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    "VERBOSE",
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    "DEBUG",
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    "INFO",
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    "WARN",
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    "ERROR",
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    "CRITICAL"
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};
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#ifdef __ANDROID__
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static const char *SDL_category_prefixes[SDL_LOG_CATEGORY_RESERVED1] = {
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    "APP",
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    "ERROR",
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    "SYSTEM",
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    "AUDIO",
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    "VIDEO",
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    "RENDER",
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    "INPUT"
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};
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static int SDL_android_priority[SDL_NUM_LOG_PRIORITIES] = {
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    ANDROID_LOG_UNKNOWN,
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    ANDROID_LOG_VERBOSE,
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    ANDROID_LOG_DEBUG,
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    ANDROID_LOG_INFO,
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    ANDROID_LOG_WARN,
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    ANDROID_LOG_ERROR,
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    ANDROID_LOG_FATAL
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};
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#endif /* __ANDROID__ */
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void
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SDL_LogSetAllPriority(SDL_LogPriority priority)
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{
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    SDL_LogLevel *entry;
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    for (entry = SDL_loglevels; entry; entry = entry->next) {
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        entry->priority = priority;
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    }
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    SDL_default_priority = priority;
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    SDL_assert_priority = priority;
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    SDL_application_priority = priority;
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}
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void
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SDL_LogSetPriority(int category, SDL_LogPriority priority)
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{
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    SDL_LogLevel *entry;
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    for (entry = SDL_loglevels; entry; entry = entry->next) {
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        if (entry->category == category) {
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            entry->priority = priority;
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            return;
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        }
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    }
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    /* Create a new entry */
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    entry = (SDL_LogLevel *)SDL_malloc(sizeof(*entry));
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    if (entry) {
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        entry->category = category;
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        entry->priority = priority;
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        entry->next = SDL_loglevels;
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        SDL_loglevels = entry;
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    }
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}
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SDL_LogPriority
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SDL_LogGetPriority(int category)
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{
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    SDL_LogLevel *entry;
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    for (entry = SDL_loglevels; entry; entry = entry->next) {
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        if (entry->category == category) {
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            return entry->priority;
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        }
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    }
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    if (category == SDL_LOG_CATEGORY_TEST) {
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        return SDL_test_priority;
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    } else if (category == SDL_LOG_CATEGORY_APPLICATION) {
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        return SDL_application_priority;
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    } else if (category == SDL_LOG_CATEGORY_ASSERT) {
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        return SDL_assert_priority;
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    } else {
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        return SDL_default_priority;
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    }
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}
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void
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SDL_LogResetPriorities(void)
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{
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    SDL_LogLevel *entry;
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    while (SDL_loglevels) {
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        entry = SDL_loglevels;
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        SDL_loglevels = entry->next;
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        SDL_free(entry);
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    }
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    SDL_default_priority = DEFAULT_PRIORITY;
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    SDL_assert_priority = DEFAULT_ASSERT_PRIORITY;
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    SDL_application_priority = DEFAULT_APPLICATION_PRIORITY;
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    SDL_test_priority = DEFAULT_TEST_PRIORITY;
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}
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void
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SDL_Log(SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogVerbose(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, SDL_LOG_PRIORITY_VERBOSE, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogDebug(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, SDL_LOG_PRIORITY_DEBUG, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogInfo(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, SDL_LOG_PRIORITY_INFO, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogWarn(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, SDL_LOG_PRIORITY_WARN, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogError(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, SDL_LOG_PRIORITY_ERROR, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogCritical(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, SDL_LOG_PRIORITY_CRITICAL, fmt, ap);
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    va_end(ap);
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}
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void
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SDL_LogMessage(int category, SDL_LogPriority priority, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    SDL_LogMessageV(category, priority, fmt, ap);
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    va_end(ap);
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}
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#ifdef __ANDROID__
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static const char *
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GetCategoryPrefix(int category)
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{
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    if (category < SDL_LOG_CATEGORY_RESERVED1) {
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        return SDL_category_prefixes[category];
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    }
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    if (category < SDL_LOG_CATEGORY_CUSTOM) {
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        return "RESERVED";
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    }
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    return "CUSTOM";
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}
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#endif /* __ANDROID__ */
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void
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SDL_LogMessageV(int category, SDL_LogPriority priority, const char *fmt, va_list ap)
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{
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    char *message;
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    size_t len;
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    /* Nothing to do if we don't have an output function */
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    if (!SDL_log_function) {
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        return;
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    }
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    /* Make sure we don't exceed array bounds */
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    if ((int)priority < 0 || priority >= SDL_NUM_LOG_PRIORITIES) {
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        return;
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    }
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    /* See if we want to do anything with this message */
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    if (priority < SDL_LogGetPriority(category)) {
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        return;
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    }
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    message = SDL_stack_alloc(char, SDL_MAX_LOG_MESSAGE);
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    if (!message) {
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        return;
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    }
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    SDL_vsnprintf(message, SDL_MAX_LOG_MESSAGE, fmt, ap);
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    /* Chop off final endline. */
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    len = SDL_strlen(message);
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    if ((len > 0) && (message[len-1] == '\n')) {
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        message[--len] = '\0';
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        if ((len > 0) && (message[len-1] == '\r')) {  /* catch "\r\n", too. */
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            message[--len] = '\0';
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        }
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    }
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    SDL_log_function(SDL_log_userdata, category, priority, message);
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    SDL_stack_free(message);
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}
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#if defined(__WIN32__)
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/* Flag tracking the attachment of the console: 0=unattached, 1=attached, -1=error */
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static int consoleAttached = 0;
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/* Handle to stderr output of console. */
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static HANDLE stderrHandle = NULL;
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#endif
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static void
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SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority,
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              const char *message)
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{
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#if defined(__WIN32__) || defined(__WINRT__)
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    /* Way too many allocations here, urgh */
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    /* Note: One can't call SDL_SetError here, since that function itself logs. */
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    {
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        char *output;
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        size_t length;
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        LPTSTR tstr;
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#if !defined(HAVE_STDIO_H) && !defined(__WINRT__)
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        BOOL attachResult;
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        DWORD attachError;
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        unsigned long charsWritten; 
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        /* Maybe attach console and get stderr handle */
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        if (consoleAttached == 0) {
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            attachResult = AttachConsole(ATTACH_PARENT_PROCESS);
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            if (!attachResult) {
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                    attachError = GetLastError();
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                    if (attachError == ERROR_INVALID_HANDLE) {
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                        OutputDebugString(TEXT("Parent process has no console\r\n"));
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                        consoleAttached = -1;
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                    } else if (attachError == ERROR_GEN_FAILURE) {
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                         OutputDebugString(TEXT("Could not attach to console of parent process\r\n"));
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                         consoleAttached = -1;
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                    } else if (attachError == ERROR_ACCESS_DENIED) {  
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                         /* Already attached */
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                        consoleAttached = 1;
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                    } else {
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                        OutputDebugString(TEXT("Error attaching console\r\n"));
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                        consoleAttached = -1;
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                    }
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                } else {
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                    /* Newly attached */
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                    consoleAttached = 1;
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                }
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                if (consoleAttached == 1) {
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                        stderrHandle = GetStdHandle(STD_ERROR_HANDLE);
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                }
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        }
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#endif /* !defined(HAVE_STDIO_H) && !defined(__WINRT__) */
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        length = SDL_strlen(SDL_priority_prefixes[priority]) + 2 + SDL_strlen(message) + 1 + 1 + 1;
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        output = SDL_stack_alloc(char, length);
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        SDL_snprintf(output, length, "%s: %s\r\n", SDL_priority_prefixes[priority], message);
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        tstr = WIN_UTF8ToString(output);
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        /* Output to debugger */
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        OutputDebugString(tstr);
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#if !defined(HAVE_STDIO_H) && !defined(__WINRT__)
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        /* Screen output to stderr, if console was attached. */
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        if (consoleAttached == 1) {
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                if (!WriteConsole(stderrHandle, tstr, lstrlen(tstr), &charsWritten, NULL)) {
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                    OutputDebugString(TEXT("Error calling WriteConsole\r\n"));
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                    if (GetLastError() == ERROR_NOT_ENOUGH_MEMORY) {
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   375
                        OutputDebugString(TEXT("Insufficient heap memory to write message\r\n"));
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   376
                    }
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   377
                }
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   378
        }
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   379
#endif /* !defined(HAVE_STDIO_H) && !defined(__WINRT__) */
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   380
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   381
        SDL_free(tstr);
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        SDL_stack_free(output);
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   383
    }
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   384
#elif defined(__ANDROID__)
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    {
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   386
        char tag[32];
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   387
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   388
        SDL_snprintf(tag, SDL_arraysize(tag), "SDL/%s", GetCategoryPrefix(category));
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   389
        __android_log_write(SDL_android_priority[priority], tag, message);
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   390
    }
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   391
#elif defined(__APPLE__) && defined(SDL_VIDEO_DRIVER_COCOA)
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    /* Technically we don't need SDL_VIDEO_DRIVER_COCOA, but that's where this function is defined for now.
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   393
    */
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   394
    extern void SDL_NSLog(const char *text);
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   395
    {
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   396
        char *text;
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   397
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   398
        text = SDL_stack_alloc(char, SDL_MAX_LOG_MESSAGE);
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   399
        if (text) {
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   400
            SDL_snprintf(text, SDL_MAX_LOG_MESSAGE, "%s: %s", SDL_priority_prefixes[priority], message);
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   401
            SDL_NSLog(text);
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   402
            SDL_stack_free(text);
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   403
            return;
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   404
        }
slouken@8582
   405
    }
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   406
#elif defined(__PSP__)
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   407
    {
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   408
        FILE*        pFile;
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   409
        pFile = fopen ("SDL_Log.txt", "a");
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   410
        fprintf(pFile, "%s: %s\n", SDL_priority_prefixes[priority], message);
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   411
        fclose (pFile);
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   412
    }
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   413
#endif
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   414
#if HAVE_STDIO_H
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   415
    fprintf(stderr, "%s: %s\n", SDL_priority_prefixes[priority], message);
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   416
#if __NACL__
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   417
    fflush(stderr);
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   418
#endif
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   419
#endif
slouken@8582
   420
}
slouken@8582
   421
slouken@8582
   422
void
slouken@8582
   423
SDL_LogGetOutputFunction(SDL_LogOutputFunction *callback, void **userdata)
slouken@8582
   424
{
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   425
    if (callback) {
slouken@8582
   426
        *callback = SDL_log_function;
slouken@8582
   427
    }
slouken@8582
   428
    if (userdata) {
slouken@8582
   429
        *userdata = SDL_log_userdata;
slouken@8582
   430
    }
slouken@8582
   431
}
slouken@8582
   432
slouken@8582
   433
void
slouken@8582
   434
SDL_LogSetOutputFunction(SDL_LogOutputFunction callback, void *userdata)
slouken@8582
   435
{
slouken@8582
   436
    SDL_log_function = callback;
slouken@8582
   437
    SDL_log_userdata = userdata;
slouken@8582
   438
}
slouken@8582
   439
slouken@8582
   440
/* vi: set ts=4 sw=4 expandtab: */