src/SDL_log.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2011 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_config.h"

/* Simple log messages in SDL */

#include "SDL_log.h"

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

#if defined(__WIN32__)
#include "core/windows/SDL_windows.h"
#elif defined(__ANDROID__)
#include <android/log.h>
#endif

#define DEFAULT_PRIORITY                SDL_LOG_PRIORITY_CRITICAL
#define DEFAULT_APPLICATION_PRIORITY    SDL_LOG_PRIORITY_INFO

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

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

static SDL_LogLevel *SDL_loglevels;
static SDL_LogPriority SDL_application_priority = DEFAULT_APPLICATION_PRIORITY;
static SDL_LogPriority SDL_default_priority = DEFAULT_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_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_application_priority = SDL_default_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_APPLICATION) {
        return SDL_application_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_application_priority = DEFAULT_APPLICATION_PRIORITY;
    SDL_default_priority = DEFAULT_PRIORITY;
}

void
SDL_Log(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, 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, 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, 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, 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, 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, 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, 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;

    /* 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 (priority < 0 || priority >= SDL_NUM_LOG_PRIORITIES) {
        return;
    }

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

    message = SDL_stack_alloc(char, SDL_MAX_LOG_MESSAGE);
    if (!message) {
        return;
    }
    SDL_vsnprintf(message, SDL_MAX_LOG_MESSAGE, fmt, ap);
    SDL_log_function(SDL_log_userdata, category, priority, message);
    SDL_stack_free(message);
}

static void
SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority,
              const char *message)
{
#if defined(__WIN32__)
    /* Way too many allocations here, urgh */
    {
        char *output;
        size_t length;
        LPTSTR tstr;

        length = SDL_strlen(SDL_priority_prefixes[priority]) + 2 + SDL_strlen(message) + 1;
        output = SDL_stack_alloc(char, length);
        SDL_snprintf(output, length, "%s: %s", SDL_priority_prefixes[priority], message);
        tstr = WIN_UTF8ToString(output);
        OutputDebugString(tstr);
        SDL_free(tstr);
        SDL_stack_free(output);
    }
#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);
    }
#endif
#if HAVE_STDIO_H
    fprintf(stderr, "%s: %s\n", SDL_priority_prefixes[priority], message);
#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: */