Mercurial > sdl-ios-xcode
view src/SDL_error.c @ 1555:780fd5b61df1
Fixed bug #89
Date: Sun, 23 Oct 2005 16:39:03 +0200
From: "A. Schmid" <sahib@phreaker.net>
Subject: [SDL] no software surfaces with svgalib driver?
Hi,
I noticed that the SDL (1.2.9) svgalib driver only makes use of linear
addressable (framebuffer) video modes. On older systems (like one of
mine), linear addressable modes are often not available.
Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is
unusable, since VESA only supports framebuffering for VBE 2.0 and later.
The changes necessary to add support for software surfaces seem to be
relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see
attached patch). The code worked fine for me, but it is no more than a
proof of concept and should be reviewed (probably has a memory leak when
switching modes). It also uses the vgagl library (included in the
svgalib package) and needs to be linked against it.
-Alex
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 19 Mar 2006 12:05:16 +0000 |
parents | d910939febfa |
children | 97d0966f4bf7 |
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/* 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 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; SDL_strlcpy((char *)error->key, fmt, sizeof(error->key)); 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; char *str = va_arg(ap, char *); if (str == NULL) str = "(null)"; SDL_strlcpy((char *)error->args[index].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 } /* 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; SDL_snprintf(tmp, SDL_arraysize(tmp), "%d", value); len = 0; if ( SDL_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; SDL_snprintf(tmp, SDL_arraysize(tmp), "%f", value); len = 0; if ( SDL_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; SDL_snprintf(tmp, SDL_arraysize(tmp), "%p", value); len = 0; if ( SDL_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 *)SDL_malloc(maxlen * (sizeof *errstr16)); if ( ! errstr16 ) { SDL_strlcpy((char *)errstr, "Out of memory", maxlen); 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) */ SDL_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(); 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