Mercurial > sdl-ios-xcode
view src/SDL_error.c @ 638:b0108e9dea53
Date: Sun, 11 May 2003 19:59:06 +0300
From: Pasi K?rkk?inen
Subject: [PATCH] fix SDL OpenGL segfault with DRI/Mesa drivers and Glew
Hello!
The attached patch fixes a bug in SDL which causes SDL to crash in
X11_GL_Shutdown() if you are using DRI/Mesa drivers AND glew
(http://glew.sf.net).
The bug is caused by a namespace collision affecting dlsym() to fetch wrong
pointer for glXReleaseBuffersMESA() (uninitialized pointer from glew because
the extension is NOT supported by the driver) and then SDL calling it in
X11_GL_Shutdown().
SDL should check if the glXReleaseBuffersMESA() is really supported by the
driver (from the extensions string) before calling it.
Attached patch adds extension string parsing to check if
glXReleaseBuffersMESA() is really supported (and this way
prevents the segfault).
Availability of the extensions should be _always_ checked from the
extensions string rather than using dlsym()!
Please add it to the next version of SDL.
Thanks to gltron and author of glew to help fixing this.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 28 Jun 2003 17:27:33 +0000 |
parents | f6ffac90895c |
children | b8d311d90021 |
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/* 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