view src/SDL_error.c @ 615:7ec821f3cbd0

Date: Thu, 17 Apr 2003 23:27:34 -0400 From: Darrell Walisser Subject: Yet another OS X cursor bug The synopsis: 1. Call SDL_ShowCursor(0); 2. Call SDL_SetVideoMode(); 3. Call SDL_GetEvent(); 3. Call SDL_ShowCursor(1); The result: Sometimes the cursor doesn't come back! Ack! Oddly enough, it does come back when mousing over the dock or clicking in the menu bar. But that's besides the point. The reason why this is happening is a flaw in the handling of activation/deactivation events. The short explanation is that the HideCursor() and ShowCursor() calls must be balanced, but if the cursor was initially hidden, HideCursor() was called again on the activate event - so now the next ShowCursor() fails (as does the next, and the next, for some reason). So, here's the patch. All it does is keep track of the HideCursor()/ShowCursor() calls so that they will always be balanced.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 20 Apr 2003 05:41:16 +0000
parents f6ffac90895c
children b8d311d90021
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* Simple error handling in SDL */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>

#include "SDL_types.h"
#include "SDL_getenv.h"
#include "SDL_error.h"
#include "SDL_error_c.h"
#ifndef DISABLE_THREADS
#include "SDL_thread_c.h"
#endif

#ifdef DISABLE_THREADS
/* The default (non-thread-safe) global error variable */
static SDL_error SDL_global_error;

#define SDL_GetErrBuf()	(&SDL_global_error)
#endif /* DISABLE_THREADS */

#ifdef __CYGWIN__
#define DISABLE_STDIO
#endif

#define SDL_ERRBUFIZE	1024

/* Private functions */

static void SDL_LookupString(const Uint8 *key, Uint16 *buf, int buflen)
{
	/* FIXME: Add code to lookup key in language string hash-table */

	/* Key not found in language string hash-table */
	while ( *key && (--buflen > 0) ) {
		*buf++ = *key++;
	}
	*buf = 0;	/* NULL terminate string */
}

/* 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;
	strncpy((char *)error->key, fmt, sizeof(error->key));
	error->key[sizeof(error->key)-1] = '\0';

	va_start(ap, fmt);
	error->argc = 0;
	while ( *fmt ) {
		if ( *fmt++ == '%' ) {
			switch (*fmt++) {
			    case 0:  /* Malformed format string.. */
				--fmt;
				break;
#if 0	/* What is a character anyway?  (UNICODE issues) */
			    case 'c':
				error->args[error->argc++].value_c =
						va_arg(ap, unsigned char);
				break;
#endif
			    case 'd':
				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 index = error->argc;
				  strncpy((char *)error->args[index].buf,
					va_arg(ap, char *), ERR_MAX_STRLEN);
				  error->args[index].buf[ERR_MAX_STRLEN-1] = 0;
				  error->argc++;
				}
				break;
			    default:
				break;
			}
			if ( error->argc >= ERR_MAX_ARGS ) {
				break;
			}
		}
	}
	va_end(ap);

#ifndef DISABLE_STDIO
	/* If we are in debug mode, print out an error message */
#ifdef DEBUG_ERROR
	fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
#else
	if ( getenv("SDL_DEBUG") ) {
		fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
	}
#endif
#endif /* !DISABLE_STDIO */
}

/* Print out an integer value to a UNICODE buffer */
static int PrintInt(Uint16 *str, unsigned int maxlen, int value)
{
	char tmp[128];
	int len, i;

	sprintf(tmp, "%d", value);
	len = 0;
	if ( strlen(tmp) < maxlen ) {
		for ( i=0; tmp[i]; ++i ) {
			*str++ = tmp[i];
			++len;
		}
	}
	return(len);
}
/* Print out a double value to a UNICODE buffer */
static int PrintDouble(Uint16 *str, unsigned int maxlen, double value)
{
	char tmp[128];
	int len, i;

	sprintf(tmp, "%f", value);
	len = 0;
	if ( strlen(tmp) < maxlen ) {
		for ( i=0; tmp[i]; ++i ) {
			*str++ = tmp[i];
			++len;
		}
	}
	return(len);
}
/* Print out a pointer value to a UNICODE buffer */
static int PrintPointer(Uint16 *str, unsigned int maxlen, void *value)
{
	char tmp[128];
	int len, i;

	sprintf(tmp, "%p", value);
	len = 0;
	if ( strlen(tmp) < maxlen ) {
		for ( i=0; tmp[i]; ++i ) {
			*str++ = tmp[i];
			++len;
		}
	}
	return(len);
}

/* This function has a bit more overhead than most error functions
   so that it supports internationalization and thread-safe errors.
*/
Uint16 *SDL_GetErrorMsgUNICODE(Uint16 *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 ) {
		Uint16 translated[ERR_MAX_STRLEN], *fmt, *msg;
		int len;
		int argi;

		/* Print out the UNICODE error message */
		SDL_LookupString(error->key, translated, sizeof(translated));
		msg = errstr;
		argi = 0;
		for ( fmt=translated; *fmt && (maxlen > 0); ) {
			if ( *fmt == '%' ) {
				switch (fmt[1]) {
				    case 'S':	/* Special SKIP operand */
					argi += (fmt[2] - '0');
					++fmt;
					break;
				    case '%':
					*msg++ = '%';
					maxlen -= 1;
					break;
#if 0	/* What is a character anyway?  (UNICODE issues) */
				    case 'c':
                                        *msg++ = (unsigned char)
					         error->args[argi++].value_c;
					maxlen -= 1;
					break;
#endif
				    case 'd':
					len = PrintInt(msg, maxlen,
						error->args[argi++].value_i);
					msg += len;
					maxlen -= len;
					break;
				    case 'f':
					len = PrintDouble(msg, maxlen,
						error->args[argi++].value_f);
					msg += len;
					maxlen -= len;
					break;
				    case 'p':
					len = PrintPointer(msg, maxlen,
						error->args[argi++].value_ptr);
					msg += len;
					maxlen -= len;
					break;
				    case 's': /* UNICODE string */
					{ Uint16 buf[ERR_MAX_STRLEN], *str;
					  SDL_LookupString(error->args[argi++].buf, buf, sizeof(buf));
					  str = buf;
					  while ( *str && (maxlen > 0) ) {
						*msg++ = *str++;
						maxlen -= 1;
					  }
					}
					break;
				}
				fmt += 2;
			} else {
				*msg++ = *fmt++;
				maxlen -= 1;
			}
		}
		*msg = 0;	/* NULL terminate the string */
	}
	return(errstr);
}

Uint8 *SDL_GetErrorMsg(Uint8 *errstr, unsigned int maxlen)
{
	Uint16 *errstr16;
	unsigned int i;

	/* Allocate the UNICODE buffer */
	errstr16 = (Uint16 *)malloc(maxlen * (sizeof *errstr16));
	if ( ! errstr16 ) {
		strncpy((char *)errstr, "Out of memory", maxlen);
		errstr[maxlen-1] = '\0';
		return(errstr);
	}

	/* Get the error message */
	SDL_GetErrorMsgUNICODE(errstr16, maxlen);

	/* Convert from UNICODE to Latin1 encoding */
	for ( i=0; i<maxlen; ++i ) {
		errstr[i] = (Uint8)errstr16[i];
	}

	/* Free UNICODE buffer (if necessary) */
	free(errstr16);

	return(errstr);
}

/* Available for backwards compatibility */
char *SDL_GetError (void)
{
	static char errmsg[SDL_ERRBUFIZE];

	return((char *)SDL_GetErrorMsg((unsigned char *)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();
	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