src/SDL_log.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "./SDL_internal.h"

#if defined(__WIN32__) || defined(__WINRT__)
#include "core/windows/SDL_windows.h"
#endif

/* Simple log messages in SDL */

#include "SDL_error.h"
#include "SDL_log.h"

#if HAVE_STDIO_H
#include <stdio.h>
#endif

#if defined(__ANDROID__)
#include <android/log.h>
#endif

#define DEFAULT_PRIORITY                SDL_LOG_PRIORITY_CRITICAL
#define DEFAULT_ASSERT_PRIORITY         SDL_LOG_PRIORITY_WARN
#define DEFAULT_APPLICATION_PRIORITY    SDL_LOG_PRIORITY_INFO
#define DEFAULT_TEST_PRIORITY           SDL_LOG_PRIORITY_VERBOSE

typedef struct SDL_LogLevel
{
    int category;
    SDL_LogPriority priority;
    struct SDL_LogLevel *next;
} SDL_LogLevel;

/* The default log output function */
static void SDLCALL SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority, const char *message);

static SDL_LogLevel *SDL_loglevels;
static SDL_LogPriority SDL_default_priority = DEFAULT_PRIORITY;
static SDL_LogPriority SDL_assert_priority = DEFAULT_ASSERT_PRIORITY;
static SDL_LogPriority SDL_application_priority = DEFAULT_APPLICATION_PRIORITY;
static SDL_LogPriority SDL_test_priority = DEFAULT_TEST_PRIORITY;
static SDL_LogOutputFunction SDL_log_function = SDL_LogOutput;
static void *SDL_log_userdata = NULL;

static const char *SDL_priority_prefixes[SDL_NUM_LOG_PRIORITIES] = {
    NULL,
    "VERBOSE",
    "DEBUG",
    "INFO",
    "WARN",
    "ERROR",
    "CRITICAL"
};

#ifdef __ANDROID__
static const char *SDL_category_prefixes[SDL_LOG_CATEGORY_RESERVED1] = {
    "APP",
    "ERROR",
    "SYSTEM",
    "AUDIO",
    "VIDEO",
    "RENDER",
    "INPUT"
};

static int SDL_android_priority[SDL_NUM_LOG_PRIORITIES] = {
    ANDROID_LOG_UNKNOWN,
    ANDROID_LOG_VERBOSE,
    ANDROID_LOG_DEBUG,
    ANDROID_LOG_INFO,
    ANDROID_LOG_WARN,
    ANDROID_LOG_ERROR,
    ANDROID_LOG_FATAL
};
#endif /* __ANDROID__ */


void
SDL_LogSetAllPriority(SDL_LogPriority priority)
{
    SDL_LogLevel *entry;

    for (entry = SDL_loglevels; entry; entry = entry->next) {
        entry->priority = priority;
    }
    SDL_default_priority = priority;
    SDL_assert_priority = priority;
    SDL_application_priority = priority;
}

void
SDL_LogSetPriority(int category, SDL_LogPriority priority)
{
    SDL_LogLevel *entry;

    for (entry = SDL_loglevels; entry; entry = entry->next) {
        if (entry->category == category) {
            entry->priority = priority;
            return;
        }
    }

    /* Create a new entry */
    entry = (SDL_LogLevel *)SDL_malloc(sizeof(*entry));
    if (entry) {
        entry->category = category;
        entry->priority = priority;
        entry->next = SDL_loglevels;
        SDL_loglevels = entry;
    }
}

SDL_LogPriority
SDL_LogGetPriority(int category)
{
    SDL_LogLevel *entry;

    for (entry = SDL_loglevels; entry; entry = entry->next) {
        if (entry->category == category) {
            return entry->priority;
        }
    }

    if (category == SDL_LOG_CATEGORY_TEST) {
        return SDL_test_priority;
    } else if (category == SDL_LOG_CATEGORY_APPLICATION) {
        return SDL_application_priority;
    } else if (category == SDL_LOG_CATEGORY_ASSERT) {
        return SDL_assert_priority;
    } else {
        return SDL_default_priority;
    }
}

void
SDL_LogResetPriorities(void)
{
    SDL_LogLevel *entry;

    while (SDL_loglevels) {
        entry = SDL_loglevels;
        SDL_loglevels = entry->next;
        SDL_free(entry);
    }

    SDL_default_priority = DEFAULT_PRIORITY;
    SDL_assert_priority = DEFAULT_ASSERT_PRIORITY;
    SDL_application_priority = DEFAULT_APPLICATION_PRIORITY;
    SDL_test_priority = DEFAULT_TEST_PRIORITY;
}

void
SDL_Log(SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, fmt, ap);
    va_end(ap);
}

void
SDL_LogVerbose(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, SDL_LOG_PRIORITY_VERBOSE, fmt, ap);
    va_end(ap);
}

void
SDL_LogDebug(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, SDL_LOG_PRIORITY_DEBUG, fmt, ap);
    va_end(ap);
}

void
SDL_LogInfo(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, SDL_LOG_PRIORITY_INFO, fmt, ap);
    va_end(ap);
}

void
SDL_LogWarn(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, SDL_LOG_PRIORITY_WARN, fmt, ap);
    va_end(ap);
}

void
SDL_LogError(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, SDL_LOG_PRIORITY_ERROR, fmt, ap);
    va_end(ap);
}

void
SDL_LogCritical(int category, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, SDL_LOG_PRIORITY_CRITICAL, fmt, ap);
    va_end(ap);
}

void
SDL_LogMessage(int category, SDL_LogPriority priority, SDL_PRINTF_FORMAT_STRING const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    SDL_LogMessageV(category, priority, fmt, ap);
    va_end(ap);
}

#ifdef __ANDROID__
static const char *
GetCategoryPrefix(int category)
{
    if (category < SDL_LOG_CATEGORY_RESERVED1) {
        return SDL_category_prefixes[category];
    }
    if (category < SDL_LOG_CATEGORY_CUSTOM) {
        return "RESERVED";
    }
    return "CUSTOM";
}
#endif /* __ANDROID__ */

void
SDL_LogMessageV(int category, SDL_LogPriority priority, const char *fmt, va_list ap)
{
    char *message;
    size_t len;

    /* Nothing to do if we don't have an output function */
    if (!SDL_log_function) {
        return;
    }

    /* Make sure we don't exceed array bounds */
    if ((int)priority < 0 || priority >= SDL_NUM_LOG_PRIORITIES) {
        return;
    }

    /* See if we want to do anything with this message */
    if (priority < SDL_LogGetPriority(category)) {
        return;
    }

    /* !!! FIXME: why not just "char message[SDL_MAX_LOG_MESSAGE];" ? */
    message = SDL_stack_alloc(char, SDL_MAX_LOG_MESSAGE);
    if (!message) {
        return;
    }

    SDL_vsnprintf(message, SDL_MAX_LOG_MESSAGE, fmt, ap);

    /* Chop off final endline. */
    len = SDL_strlen(message);
    if ((len > 0) && (message[len-1] == '\n')) {
        message[--len] = '\0';
        if ((len > 0) && (message[len-1] == '\r')) {  /* catch "\r\n", too. */
            message[--len] = '\0';
        }
    }

    SDL_log_function(SDL_log_userdata, category, priority, message);
    SDL_stack_free(message);
}

#if defined(__WIN32__) && !defined(HAVE_STDIO_H) && !defined(__WINRT__)
/* Flag tracking the attachment of the console: 0=unattached, 1=attached to a console, 2=attached to a file, -1=error */
static int consoleAttached = 0;

/* Handle to stderr output of console. */
static HANDLE stderrHandle = NULL;
#endif

static void SDLCALL
SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority,
              const char *message)
{
#if defined(__WIN32__) || defined(__WINRT__)
    /* Way too many allocations here, urgh */
    /* Note: One can't call SDL_SetError here, since that function itself logs. */
    {
        char *output;
        size_t length;
        LPTSTR tstr;
        SDL_bool isstack;

#if !defined(HAVE_STDIO_H) && !defined(__WINRT__)
        BOOL attachResult;
        DWORD attachError;
        unsigned long charsWritten; 
        DWORD consoleMode;

        /* Maybe attach console and get stderr handle */
        if (consoleAttached == 0) {
            attachResult = AttachConsole(ATTACH_PARENT_PROCESS);
            if (!attachResult) {
                    attachError = GetLastError();
                    if (attachError == ERROR_INVALID_HANDLE) {
                        /* This is expected when running from Visual Studio */
                        /*OutputDebugString(TEXT("Parent process has no console\r\n"));*/
                        consoleAttached = -1;
                    } else if (attachError == ERROR_GEN_FAILURE) {
                         OutputDebugString(TEXT("Could not attach to console of parent process\r\n"));
                         consoleAttached = -1;
                    } else if (attachError == ERROR_ACCESS_DENIED) {  
                         /* Already attached */
                        consoleAttached = 1;
                    } else {
                        OutputDebugString(TEXT("Error attaching console\r\n"));
                        consoleAttached = -1;
                    }
                } else {
                    /* Newly attached */
                    consoleAttached = 1;
                }

                if (consoleAttached == 1) {
                        stderrHandle = GetStdHandle(STD_ERROR_HANDLE);

                        if (GetConsoleMode(stderrHandle, &consoleMode) == 0) {
                            /* WriteConsole fails if the output is redirected to a file. Must use WriteFile instead. */
                            consoleAttached = 2;
                        }
                }
        }
#endif /* !defined(HAVE_STDIO_H) && !defined(__WINRT__) */

        length = SDL_strlen(SDL_priority_prefixes[priority]) + 2 + SDL_strlen(message) + 1 + 1 + 1;
        output = SDL_small_alloc(char, length, &isstack);
        SDL_snprintf(output, length, "%s: %s\r\n", SDL_priority_prefixes[priority], message);
        tstr = WIN_UTF8ToString(output);
        
        /* Output to debugger */
        OutputDebugString(tstr);
       
#if !defined(HAVE_STDIO_H) && !defined(__WINRT__)
        /* Screen output to stderr, if console was attached. */
        if (consoleAttached == 1) {
                if (!WriteConsole(stderrHandle, tstr, lstrlen(tstr), &charsWritten, NULL)) {
                    OutputDebugString(TEXT("Error calling WriteConsole\r\n"));
                    if (GetLastError() == ERROR_NOT_ENOUGH_MEMORY) {
                        OutputDebugString(TEXT("Insufficient heap memory to write message\r\n"));
                    }
                }

        } else if (consoleAttached == 2) {
            if (!WriteFile(stderrHandle, output, lstrlenA(output), &charsWritten, NULL)) {
                OutputDebugString(TEXT("Error calling WriteFile\r\n"));
            }
        }
#endif /* !defined(HAVE_STDIO_H) && !defined(__WINRT__) */

        SDL_free(tstr);
        SDL_small_free(output, isstack);
    }
#elif defined(__ANDROID__)
    {
        char tag[32];

        SDL_snprintf(tag, SDL_arraysize(tag), "SDL/%s", GetCategoryPrefix(category));
        __android_log_write(SDL_android_priority[priority], tag, message);
    }
#elif defined(__APPLE__) && (defined(SDL_VIDEO_DRIVER_COCOA) || defined(SDL_VIDEO_DRIVER_UIKIT))
    /* Technically we don't need Cocoa/UIKit, but that's where this function is defined for now.
    */
    extern void SDL_NSLog(const char *text);
    {
        char *text;
        /* !!! FIXME: why not just "char text[SDL_MAX_LOG_MESSAGE];" ? */
        text = SDL_stack_alloc(char, SDL_MAX_LOG_MESSAGE);
        if (text) {
            SDL_snprintf(text, SDL_MAX_LOG_MESSAGE, "%s: %s", SDL_priority_prefixes[priority], message);
            SDL_NSLog(text);
            SDL_stack_free(text);
            return;
        }
    }
#elif defined(__PSP__)
    {
        FILE*        pFile;
        pFile = fopen ("SDL_Log.txt", "a");
        fprintf(pFile, "%s: %s\n", SDL_priority_prefixes[priority], message);
        fclose (pFile);
    }
#endif
#if HAVE_STDIO_H
    fprintf(stderr, "%s: %s\n", SDL_priority_prefixes[priority], message);
#if __NACL__
    fflush(stderr);
#endif
#endif
}

void
SDL_LogGetOutputFunction(SDL_LogOutputFunction *callback, void **userdata)
{
    if (callback) {
        *callback = SDL_log_function;
    }
    if (userdata) {
        *userdata = SDL_log_userdata;
    }
}

void
SDL_LogSetOutputFunction(SDL_LogOutputFunction callback, void *userdata)
{
    SDL_log_function = callback;
    SDL_log_userdata = userdata;
}

/* vi: set ts=4 sw=4 expandtab: */