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Added a way to replace the default logging mechanism

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This commit is contained in:
Sam Lantinga 2011-02-08 23:13:58 -08:00
parent 8f92919310
commit 631784d9a2
2 changed files with 54 additions and 1 deletions
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16
include/SDL_log.h
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@ -177,6 +177,22 @@ extern DECLSPEC void SDLCALL SDL_LogMessageV(int category,
SDL_LogPriority priority,
const char *fmt, va_list ap);
/**
* \brief The prototype for the log output function
*/
typedef void (*SDL_LogOutputFunction)(void *userdata, int category, SDL_LogPriority priority, const char *message);
/**
* \brief Get the current log output function.
*/
extern DECLSPEC void SDLCALL SDL_LogGetOutputFunction(SDL_LogOutputFunction *callback, void **userdata);
/**
* \brief This function allows you to replace the default log output
* function with one of your own.
*/
extern DECLSPEC void SDLCALL SDL_LogSetOutputFunction(SDL_LogOutputFunction callback, void *userdata);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus

39
src/SDL_log.c
View file

@ -45,11 +45,19 @@ typedef struct SDL_LogLevel
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",
@ -235,6 +243,11 @@ SDL_LogMessageV(int category, SDL_LogPriority priority, const char *fmt, va_list
{
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;
@ -250,7 +263,14 @@ SDL_LogMessageV(int category, SDL_LogPriority priority, const char *fmt, va_list
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 */
{
@ -277,7 +297,24 @@ SDL_LogMessageV(int category, SDL_LogPriority priority, const char *fmt, va_list
#if HAVE_STDIO_H
fprintf(stderr, "%s: %s\n", SDL_priority_prefixes[priority], message);
#endif
SDL_stack_free(message);
}
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: */