/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* Simple error handling in SDL */

#include "SDL_error.h"

#include "SDL_error_c.h"

/* Routine to get the thread-specific error variable */

#if SDL_THREADS_DISABLED

/* The  SDL_arraysize(The ),default (non-thread-safe) global error variable */

static SDL_error SDL_global_error;

#define SDL_GetErrBuf()	(&SDL_global_error)

#else

extern SDL_error *SDL_GetErrBuf(void);

#endif /* SDL_THREADS_DISABLED */

#define SDL_ERRBUFIZE	1024

/* Private functions */

static const char *SDL_LookupString(const char *key)

{

	/* FIXME: Add code to lookup key in language string hash-table */

	return key;

}

/* Public functions */

void SDL_SetError (const char *fmt, ...)

{

	va_list ap;

	SDL_error *error;

	/* Copy in the key, mark error as valid */

	error = SDL_GetErrBuf();

	error->error = 1;

	SDL_strlcpy((char *)error->key, fmt, sizeof(error->key));

	va_start(ap, fmt);

	error->argc = 0;

	while ( *fmt ) {

		if ( *fmt++ == '%' ) {

			while ( *fmt == '.' || (*fmt >= '0' && *fmt <= '9') ) {

				++fmt;

			}

			switch (*fmt++) {

			    case 0:  /* Malformed format string.. */

				--fmt;

				break;

			    case 'c':

			    case 'i':

			    case 'd':

			    case 'u':

			    case 'o':

			    case 'x':

			    case 'X':

				error->args[error->argc++].value_i =

							va_arg(ap, int);

				break;

			    case 'f':

				error->args[error->argc++].value_f =

							va_arg(ap, double);

				break;

			    case 'p':

				error->args[error->argc++].value_ptr =

							va_arg(ap, void *);

				break;

			    case 's':

				{

				  int i = error->argc;

				  const char *str = va_arg(ap, const char *);

				  if (str == NULL)

				      str = "(null)";

				  SDL_strlcpy((char *)error->args[i].buf, str, ERR_MAX_STRLEN);

				  error->argc++;

				}

				break;

			    default:

				break;

			}

			if ( error->argc >= ERR_MAX_ARGS ) {

				break;

			}

		}

	}

	va_end(ap);

	/* If we are in debug mode, print out an error message */

#ifdef DEBUG_ERROR

	fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());

#endif

}

/* This function has a bit more overhead than most error functions

   so that it supports internationalization and thread-safe errors.

*/

char *SDL_GetErrorMsg(char *errstr, unsigned int maxlen)

{

	SDL_error *error;

	/* Clear the error string */

	*errstr = '\0'; --maxlen;

	/* Get the thread-safe error, and print it out */

	error = SDL_GetErrBuf();

	if ( error->error ) {

		const char *fmt;

		char *msg = errstr;

		int len;

		int argi;

		fmt = SDL_LookupString(error->key);

		argi = 0;

		while ( *fmt && (maxlen > 0) ) {

			if ( *fmt == '%' ) {

				char tmp[32], *spot = tmp;

				*spot++ = *fmt++;

				while ( (*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) && spot < (tmp+SDL_arraysize(tmp)-2) ) {

					*spot++ = *fmt++;

				}

				*spot++ = *fmt++;

				*spot++ = '\0';

				switch (spot[-2]) {

				    case '%':

					*msg++ = '%';

					maxlen -= 1;

					break;

				    case 'c':

				    case 'i':

			            case 'd':

			            case 'u':

			            case 'o':

				    case 'x':

				    case 'X':

					len = SDL_snprintf(msg, maxlen, tmp, error->args[argi++].value_i);

					msg += len;

					maxlen -= len;

					break;

				    case 'f':

					len = SDL_snprintf(msg, maxlen, tmp, error->args[argi++].value_f);

					msg += len;

					maxlen -= len;

					break;

				    case 'p':

					len = SDL_snprintf(msg, maxlen, tmp, error->args[argi++].value_ptr);

					msg += len;

					maxlen -= len;

					break;

				    case 's':

					len = SDL_snprintf(msg, maxlen, tmp, SDL_LookupString(error->args[argi++].buf));

					msg += len;

					maxlen -= len;

					break;

				}

			} else {

				*msg++ = *fmt++;

				maxlen -= 1;

			}

		}

		*msg = 0;	/* NULL terminate the string */

	}

	return(errstr);

}

/* Available for backwards compatibility */

char *SDL_GetError (void)

{

	static char errmsg[SDL_ERRBUFIZE];

	return((char *)SDL_GetErrorMsg(errmsg, SDL_ERRBUFIZE));

}

void SDL_ClearError(void)

{

	SDL_error *error;

	error = SDL_GetErrBuf();

	error->error = 0;

}

/* Very common errors go here */

void SDL_Error(SDL_errorcode code)

{

	switch (code) {

		case SDL_ENOMEM:

			SDL_SetError("Out of memory");

			break;

		case SDL_EFREAD:

			SDL_SetError("Error reading from datastream");

			break;

		case SDL_EFWRITE:

			SDL_SetError("Error writing to datastream");

			break;

		case SDL_EFSEEK:

			SDL_SetError("Error seeking in datastream");

			break;

		default:

			SDL_SetError("Unknown SDL error");

			break;

	}

}

#ifdef TEST_ERROR

int main(int argc, char *argv[])

{

	char buffer[BUFSIZ+1];

	SDL_SetError("Hi there!");

	printf("Error 1: %s\n", SDL_GetError());

	SDL_ClearError();

	SDL_memset(buffer, '1', BUFSIZ);

	buffer[BUFSIZ] = 0;

	SDL_SetError("This is the error: %s (%f)", buffer, 1.0);

	printf("Error 2: %s\n", SDL_GetError());

	exit(0);

}

#endif