src/SDL_error.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 01 Feb 2006 06:32:25 +0000
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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* Simple error handling in SDL */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include "SDL_types.h"
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#include "SDL_getenv.h"
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#include "SDL_error.h"
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#include "SDL_error_c.h"
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#ifndef DISABLE_THREADS
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#include "SDL_thread_c.h"
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#endif
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#ifdef DISABLE_THREADS
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/* The default (non-thread-safe) global error variable */
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static SDL_error SDL_global_error;
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#define SDL_GetErrBuf()	(&SDL_global_error)
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#endif /* DISABLE_THREADS */
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#ifdef __CYGWIN__
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#define DISABLE_STDIO
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#endif
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#define SDL_ERRBUFIZE	1024
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/* Private functions */
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static void SDL_LookupString(const Uint8 *key, Uint16 *buf, int buflen)
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{
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	/* FIXME: Add code to lookup key in language string hash-table */
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	/* Key not found in language string hash-table */
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	while ( *key && (--buflen > 0) ) {
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		*buf++ = *key++;
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	}
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	*buf = 0;	/* NULL terminate string */
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}
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/* Public functions */
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void SDL_SetError (const char *fmt, ...)
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{
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	va_list ap;
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	SDL_error *error;
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	/* Copy in the key, mark error as valid */
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	error = SDL_GetErrBuf();
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	error->error = 1;
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	strncpy((char *)error->key, fmt, sizeof(error->key));
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	error->key[sizeof(error->key)-1] = '\0';
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	va_start(ap, fmt);
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	error->argc = 0;
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	while ( *fmt ) {
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		if ( *fmt++ == '%' ) {
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			switch (*fmt++) {
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			    case 0:  /* Malformed format string.. */
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				--fmt;
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				break;
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#if 0	/* What is a character anyway?  (UNICODE issues) */
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			    case 'c':
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				error->args[error->argc++].value_c =
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						va_arg(ap, unsigned char);
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				break;
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#endif
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			    case 'd':
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				error->args[error->argc++].value_i =
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							va_arg(ap, int);
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				break;
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			    case 'f':
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				error->args[error->argc++].value_f =
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							va_arg(ap, double);
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				break;
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			    case 'p':
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				error->args[error->argc++].value_ptr =
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							va_arg(ap, void *);
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				break;
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			    case 's':
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				{
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				  int index = error->argc;
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				  char *str = va_arg(ap, char *);
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				  if (str == NULL)
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				      str = "(null)";
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				  strncpy((char *)error->args[index].buf, str, ERR_MAX_STRLEN);
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				  error->args[index].buf[ERR_MAX_STRLEN-1] = 0;
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				  error->argc++;
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				}
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				break;
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			    default:
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				break;
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			}
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			if ( error->argc >= ERR_MAX_ARGS ) {
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				break;
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			}
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		}
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	}
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	va_end(ap);
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#ifndef DISABLE_STDIO
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	/* If we are in debug mode, print out an error message */
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#ifdef DEBUG_ERROR
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	fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
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#else
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	if ( getenv("SDL_DEBUG") ) {
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		fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
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	}
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#endif
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#endif /* !DISABLE_STDIO */
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}
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/* Print out an integer value to a UNICODE buffer */
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static int PrintInt(Uint16 *str, unsigned int maxlen, int value)
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{
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	char tmp[128];
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	int len, i;
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	sprintf(tmp, "%d", value);
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	len = 0;
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	if ( strlen(tmp) < maxlen ) {
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		for ( i=0; tmp[i]; ++i ) {
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			*str++ = tmp[i];
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			++len;
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		}
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	}
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	return(len);
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}
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/* Print out a double value to a UNICODE buffer */
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static int PrintDouble(Uint16 *str, unsigned int maxlen, double value)
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{
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	char tmp[128];
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	int len, i;
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	sprintf(tmp, "%f", value);
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	len = 0;
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	if ( strlen(tmp) < maxlen ) {
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		for ( i=0; tmp[i]; ++i ) {
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			*str++ = tmp[i];
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			++len;
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		}
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	}
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	return(len);
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}
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/* Print out a pointer value to a UNICODE buffer */
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static int PrintPointer(Uint16 *str, unsigned int maxlen, void *value)
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{
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	char tmp[128];
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	int len, i;
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	sprintf(tmp, "%p", value);
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	len = 0;
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	if ( strlen(tmp) < maxlen ) {
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		for ( i=0; tmp[i]; ++i ) {
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			*str++ = tmp[i];
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			++len;
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		}
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	}
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	return(len);
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}
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/* This function has a bit more overhead than most error functions
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   so that it supports internationalization and thread-safe errors.
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*/
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Uint16 *SDL_GetErrorMsgUNICODE(Uint16 *errstr, unsigned int maxlen)
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{
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	SDL_error *error;
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	/* Clear the error string */
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	*errstr = 0; --maxlen;
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	/* Get the thread-safe error, and print it out */
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	error = SDL_GetErrBuf();
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	if ( error->error ) {
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		Uint16 translated[ERR_MAX_STRLEN], *fmt, *msg;
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		int len;
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		int argi;
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		/* Print out the UNICODE error message */
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		SDL_LookupString(error->key, translated, sizeof(translated));
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		msg = errstr;
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		argi = 0;
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		for ( fmt=translated; *fmt && (maxlen > 0); ) {
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			if ( *fmt == '%' ) {
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				switch (fmt[1]) {
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				    case 'S':	/* Special SKIP operand */
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					argi += (fmt[2] - '0');
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					++fmt;
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					break;
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				    case '%':
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					*msg++ = '%';
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					maxlen -= 1;
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					break;
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#if 0	/* What is a character anyway?  (UNICODE issues) */
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				    case 'c':
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                                        *msg++ = (unsigned char)
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					         error->args[argi++].value_c;
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					maxlen -= 1;
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					break;
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   223
#endif
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				    case 'd':
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					len = PrintInt(msg, maxlen,
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						error->args[argi++].value_i);
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					msg += len;
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					maxlen -= len;
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					break;
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   230
				    case 'f':
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					len = PrintDouble(msg, maxlen,
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						error->args[argi++].value_f);
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					msg += len;
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					maxlen -= len;
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					break;
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   236
				    case 'p':
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					len = PrintPointer(msg, maxlen,
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   238
						error->args[argi++].value_ptr);
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   239
					msg += len;
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   240
					maxlen -= len;
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   241
					break;
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   242
				    case 's': /* UNICODE string */
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   243
					{ Uint16 buf[ERR_MAX_STRLEN], *str;
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					  SDL_LookupString(error->args[argi++].buf, buf, sizeof(buf));
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					  str = buf;
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   246
					  while ( *str && (maxlen > 0) ) {
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   247
						*msg++ = *str++;
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   248
						maxlen -= 1;
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   249
					  }
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   250
					}
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   251
					break;
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   252
				}
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   253
				fmt += 2;
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   254
			} else {
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   255
				*msg++ = *fmt++;
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   256
				maxlen -= 1;
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   257
			}
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   258
		}
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   259
		*msg = 0;	/* NULL terminate the string */
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   260
	}
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   261
	return(errstr);
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   262
}
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   263
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   264
Uint8 *SDL_GetErrorMsg(Uint8 *errstr, unsigned int maxlen)
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   265
{
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   266
	Uint16 *errstr16;
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   267
	unsigned int i;
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   268
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   269
	/* Allocate the UNICODE buffer */
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   270
	errstr16 = (Uint16 *)malloc(maxlen * (sizeof *errstr16));
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   271
	if ( ! errstr16 ) {
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   272
		strncpy((char *)errstr, "Out of memory", maxlen);
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   273
		errstr[maxlen-1] = '\0';
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   274
		return(errstr);
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   275
	}
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   276
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   277
	/* Get the error message */
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   278
	SDL_GetErrorMsgUNICODE(errstr16, maxlen);
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   279
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   280
	/* Convert from UNICODE to Latin1 encoding */
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   281
	for ( i=0; i<maxlen; ++i ) {
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   282
		errstr[i] = (Uint8)errstr16[i];
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   283
	}
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   284
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   285
	/* Free UNICODE buffer (if necessary) */
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   286
	free(errstr16);
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diff changeset
   287
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   288
	return(errstr);
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parents:
diff changeset
   289
}
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   290
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diff changeset
   291
/* Available for backwards compatibility */
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   292
char *SDL_GetError (void)
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diff changeset
   293
{
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   294
	static char errmsg[SDL_ERRBUFIZE];
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diff changeset
   295
74212992fb08 Initial revision
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   296
	return((char *)SDL_GetErrorMsg((unsigned char *)errmsg, SDL_ERRBUFIZE));
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   297
}
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   298
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   299
void SDL_ClearError(void)
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   300
{
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   301
	SDL_error *error;
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diff changeset
   302
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   303
	error = SDL_GetErrBuf();
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   304
	error->error = 0;
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   305
}
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   306
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diff changeset
   307
/* Very common errors go here */
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   308
void SDL_Error(SDL_errorcode code)
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   309
{
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diff changeset
   310
	switch (code) {
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diff changeset
   311
		case SDL_ENOMEM:
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   312
			SDL_SetError("Out of memory");
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diff changeset
   313
			break;
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diff changeset
   314
		case SDL_EFREAD:
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			SDL_SetError("Error reading from datastream");
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			break;
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		case SDL_EFWRITE:
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			SDL_SetError("Error writing to datastream");
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			break;
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		case SDL_EFSEEK:
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			SDL_SetError("Error seeking in datastream");
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			break;
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		default:
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			SDL_SetError("Unknown SDL error");
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			break;
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	}
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}
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#ifdef TEST_ERROR
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int main(int argc, char *argv[])
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{
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	char buffer[BUFSIZ+1];
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	SDL_SetError("Hi there!");
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	printf("Error 1: %s\n", SDL_GetError());
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	SDL_ClearError();
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	memset(buffer, '1', BUFSIZ);
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	buffer[BUFSIZ] = 0;
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	SDL_SetError("This is the error: %s (%f)", buffer, 1.0);
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	printf("Error 2: %s\n", SDL_GetError());
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	exit(0);
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}
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#endif