Mercurial > sdl-ios-xcode
annotate src/SDL_error.c @ 773:da0a2ad35bf4
Date: Sun, 4 Jan 2004 23:48:19 +0100
From: Max Horn
Subject: Re: Again Audio CD patch
Am 04.01.2004 um 22:38 schrieb Sam Lantinga:
>
> Okay, I fixed the buffering problems by simply using a 4 second buffer
> instead of a 1 second buffer. However, using your code I can't play an
> entire CD - the playback stops after the first song.
>
Found the problem: FSReadFork returns eofErr when the file is finished.
However, we check its return value for errors, and if anything but
noErr occurs, the reader thread aborts its current iteration. That is
bad, because it aborts before it can ever set the flag which tells that
the file is over (also, any remaining data which FSRead did return is
lost - so you'd not hear about to 4 seconds from the end of the file.
Furthermore, the computed data size was 8 bytes to high (I forgot to
account for the fact that the size of an (A)IFF chunk always contains
the chunk header & size fields, too). This is enough to make it work.
However, the end condition is rather fragile, so I tuned some other
things to be pessimistic (check for <= 0 instead of == 0, when eofErr
is encountered enforce mReadFilePosition == mFileLength). You never
know...
The attached patch fixes the issue for me.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 05 Jan 2004 00:57:51 +0000 |
| parents | b8d311d90021 |
| children | f69f4d25fb20 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Simple error handling in SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <stdarg.h> | |
| 33 #include <string.h> | |
| 34 | |
| 35 #include "SDL_types.h" | |
| 36 #include "SDL_getenv.h" | |
| 37 #include "SDL_error.h" | |
| 38 #include "SDL_error_c.h" | |
| 39 #ifndef DISABLE_THREADS | |
| 40 #include "SDL_thread_c.h" | |
| 41 #endif | |
| 42 | |
| 43 #ifdef DISABLE_THREADS | |
| 44 /* The default (non-thread-safe) global error variable */ | |
| 45 static SDL_error SDL_global_error; | |
| 46 | |
| 47 #define SDL_GetErrBuf() (&SDL_global_error) | |
| 48 #endif /* DISABLE_THREADS */ | |
| 49 | |
|
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50 #ifdef __CYGWIN__ |
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51 #define DISABLE_STDIO |
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52 #endif |
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53 |
| 0 | 54 #define SDL_ERRBUFIZE 1024 |
| 55 | |
| 56 /* Private functions */ | |
| 57 | |
| 58 static void SDL_LookupString(const Uint8 *key, Uint16 *buf, int buflen) | |
| 59 { | |
| 60 /* FIXME: Add code to lookup key in language string hash-table */ | |
| 61 | |
| 62 /* Key not found in language string hash-table */ | |
| 63 while ( *key && (--buflen > 0) ) { | |
| 64 *buf++ = *key++; | |
| 65 } | |
| 66 *buf = 0; /* NULL terminate string */ | |
| 67 } | |
| 68 | |
| 69 /* Public functions */ | |
| 70 | |
| 71 void SDL_SetError (const char *fmt, ...) | |
| 72 { | |
| 73 va_list ap; | |
| 74 SDL_error *error; | |
| 75 | |
| 76 /* Copy in the key, mark error as valid */ | |
| 77 error = SDL_GetErrBuf(); | |
| 78 error->error = 1; | |
| 79 strncpy((char *)error->key, fmt, sizeof(error->key)); | |
| 80 error->key[sizeof(error->key)-1] = '\0'; | |
| 81 | |
| 82 va_start(ap, fmt); | |
| 83 error->argc = 0; | |
| 84 while ( *fmt ) { | |
| 85 if ( *fmt++ == '%' ) { | |
| 86 switch (*fmt++) { | |
| 87 case 0: /* Malformed format string.. */ | |
| 88 --fmt; | |
| 89 break; | |
| 90 #if 0 /* What is a character anyway? (UNICODE issues) */ | |
| 91 case 'c': | |
| 92 error->args[error->argc++].value_c = | |
| 93 va_arg(ap, unsigned char); | |
| 94 break; | |
| 95 #endif | |
| 96 case 'd': | |
| 97 error->args[error->argc++].value_i = | |
| 98 va_arg(ap, int); | |
| 99 break; | |
| 100 case 'f': | |
| 101 error->args[error->argc++].value_f = | |
| 102 va_arg(ap, double); | |
| 103 break; | |
| 104 case 'p': | |
| 105 error->args[error->argc++].value_ptr = | |
| 106 va_arg(ap, void *); | |
| 107 break; | |
| 108 case 's': | |
| 109 { | |
| 110 int index = error->argc; | |
| 111 strncpy((char *)error->args[index].buf, | |
| 112 va_arg(ap, char *), ERR_MAX_STRLEN); | |
| 113 error->args[index].buf[ERR_MAX_STRLEN-1] = 0; | |
| 114 error->argc++; | |
| 115 } | |
| 116 break; | |
| 117 default: | |
| 118 break; | |
| 119 } | |
| 120 if ( error->argc >= ERR_MAX_ARGS ) { | |
| 121 break; | |
| 122 } | |
| 123 } | |
| 124 } | |
| 125 va_end(ap); | |
| 126 | |
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127 #ifndef DISABLE_STDIO |
| 0 | 128 /* If we are in debug mode, print out an error message */ |
| 129 #ifdef DEBUG_ERROR | |
| 130 fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError()); | |
| 131 #else | |
| 132 if ( getenv("SDL_DEBUG") ) { | |
| 133 fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError()); | |
| 134 } | |
| 135 #endif | |
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136 #endif /* !DISABLE_STDIO */ |
| 0 | 137 } |
| 138 | |
| 139 /* Print out an integer value to a UNICODE buffer */ | |
| 140 static int PrintInt(Uint16 *str, unsigned int maxlen, int value) | |
| 141 { | |
| 142 char tmp[128]; | |
| 143 int len, i; | |
| 144 | |
| 145 sprintf(tmp, "%d", value); | |
| 146 len = 0; | |
| 147 if ( strlen(tmp) < maxlen ) { | |
| 148 for ( i=0; tmp[i]; ++i ) { | |
| 149 *str++ = tmp[i]; | |
| 150 ++len; | |
| 151 } | |
| 152 } | |
| 153 return(len); | |
| 154 } | |
| 155 /* Print out a double value to a UNICODE buffer */ | |
| 156 static int PrintDouble(Uint16 *str, unsigned int maxlen, double value) | |
| 157 { | |
| 158 char tmp[128]; | |
| 159 int len, i; | |
| 160 | |
| 161 sprintf(tmp, "%f", value); | |
| 162 len = 0; | |
| 163 if ( strlen(tmp) < maxlen ) { | |
| 164 for ( i=0; tmp[i]; ++i ) { | |
| 165 *str++ = tmp[i]; | |
| 166 ++len; | |
| 167 } | |
| 168 } | |
| 169 return(len); | |
| 170 } | |
| 171 /* Print out a pointer value to a UNICODE buffer */ | |
| 172 static int PrintPointer(Uint16 *str, unsigned int maxlen, void *value) | |
| 173 { | |
| 174 char tmp[128]; | |
| 175 int len, i; | |
| 176 | |
| 177 sprintf(tmp, "%p", value); | |
| 178 len = 0; | |
| 179 if ( strlen(tmp) < maxlen ) { | |
| 180 for ( i=0; tmp[i]; ++i ) { | |
| 181 *str++ = tmp[i]; | |
| 182 ++len; | |
| 183 } | |
| 184 } | |
| 185 return(len); | |
| 186 } | |
| 187 | |
| 188 /* This function has a bit more overhead than most error functions | |
| 189 so that it supports internationalization and thread-safe errors. | |
| 190 */ | |
| 191 Uint16 *SDL_GetErrorMsgUNICODE(Uint16 *errstr, unsigned int maxlen) | |
| 192 { | |
| 193 SDL_error *error; | |
| 194 | |
| 195 /* Clear the error string */ | |
| 196 *errstr = 0; --maxlen; | |
| 197 | |
| 198 /* Get the thread-safe error, and print it out */ | |
| 199 error = SDL_GetErrBuf(); | |
| 200 if ( error->error ) { | |
| 201 Uint16 translated[ERR_MAX_STRLEN], *fmt, *msg; | |
| 202 int len; | |
| 203 int argi; | |
| 204 | |
| 205 /* Print out the UNICODE error message */ | |
| 206 SDL_LookupString(error->key, translated, sizeof(translated)); | |
| 207 msg = errstr; | |
| 208 argi = 0; | |
| 209 for ( fmt=translated; *fmt && (maxlen > 0); ) { | |
| 210 if ( *fmt == '%' ) { | |
| 211 switch (fmt[1]) { | |
| 212 case 'S': /* Special SKIP operand */ | |
| 213 argi += (fmt[2] - '0'); | |
| 214 ++fmt; | |
| 215 break; | |
| 216 case '%': | |
| 217 *msg++ = '%'; | |
| 218 maxlen -= 1; | |
| 219 break; | |
| 220 #if 0 /* What is a character anyway? (UNICODE issues) */ | |
| 221 case 'c': | |
| 222 *msg++ = (unsigned char) | |
| 223 error->args[argi++].value_c; | |
| 224 maxlen -= 1; | |
| 225 break; | |
| 226 #endif | |
| 227 case 'd': | |
| 228 len = PrintInt(msg, maxlen, | |
| 229 error->args[argi++].value_i); | |
| 230 msg += len; | |
| 231 maxlen -= len; | |
| 232 break; | |
| 233 case 'f': | |
| 234 len = PrintDouble(msg, maxlen, | |
| 235 error->args[argi++].value_f); | |
| 236 msg += len; | |
| 237 maxlen -= len; | |
| 238 break; | |
| 239 case 'p': | |
| 240 len = PrintPointer(msg, maxlen, | |
| 241 error->args[argi++].value_ptr); | |
| 242 msg += len; | |
| 243 maxlen -= len; | |
| 244 break; | |
| 245 case 's': /* UNICODE string */ | |
| 246 { Uint16 buf[ERR_MAX_STRLEN], *str; | |
| 247 SDL_LookupString(error->args[argi++].buf, buf, sizeof(buf)); | |
| 248 str = buf; | |
| 249 while ( *str && (maxlen > 0) ) { | |
| 250 *msg++ = *str++; | |
| 251 maxlen -= 1; | |
| 252 } | |
| 253 } | |
| 254 break; | |
| 255 } | |
| 256 fmt += 2; | |
| 257 } else { | |
| 258 *msg++ = *fmt++; | |
| 259 maxlen -= 1; | |
| 260 } | |
| 261 } | |
| 262 *msg = 0; /* NULL terminate the string */ | |
| 263 } | |
| 264 return(errstr); | |
| 265 } | |
| 266 | |
| 267 Uint8 *SDL_GetErrorMsg(Uint8 *errstr, unsigned int maxlen) | |
| 268 { | |
| 269 Uint16 *errstr16; | |
| 270 unsigned int i; | |
| 271 | |
| 272 /* Allocate the UNICODE buffer */ | |
| 273 errstr16 = (Uint16 *)malloc(maxlen * (sizeof *errstr16)); | |
| 274 if ( ! errstr16 ) { | |
| 275 strncpy((char *)errstr, "Out of memory", maxlen); | |
| 276 errstr[maxlen-1] = '\0'; | |
| 277 return(errstr); | |
| 278 } | |
| 279 | |
| 280 /* Get the error message */ | |
| 281 SDL_GetErrorMsgUNICODE(errstr16, maxlen); | |
| 282 | |
| 283 /* Convert from UNICODE to Latin1 encoding */ | |
| 284 for ( i=0; i<maxlen; ++i ) { | |
| 285 errstr[i] = (Uint8)errstr16[i]; | |
| 286 } | |
| 287 | |
| 288 /* Free UNICODE buffer (if necessary) */ | |
| 289 free(errstr16); | |
| 290 | |
| 291 return(errstr); | |
| 292 } | |
| 293 | |
| 294 /* Available for backwards compatibility */ | |
| 295 char *SDL_GetError (void) | |
| 296 { | |
| 297 static char errmsg[SDL_ERRBUFIZE]; | |
| 298 | |
| 299 return((char *)SDL_GetErrorMsg((unsigned char *)errmsg, SDL_ERRBUFIZE)); | |
| 300 } | |
| 301 | |
| 302 void SDL_ClearError(void) | |
| 303 { | |
| 304 SDL_error *error; | |
| 305 | |
| 306 error = SDL_GetErrBuf(); | |
| 307 error->error = 0; | |
| 308 } | |
| 309 | |
| 310 /* Very common errors go here */ | |
| 311 void SDL_Error(SDL_errorcode code) | |
| 312 { | |
| 313 switch (code) { | |
| 314 case SDL_ENOMEM: | |
| 315 SDL_SetError("Out of memory"); | |
| 316 break; | |
| 317 case SDL_EFREAD: | |
| 318 SDL_SetError("Error reading from datastream"); | |
| 319 break; | |
| 320 case SDL_EFWRITE: | |
| 321 SDL_SetError("Error writing to datastream"); | |
| 322 break; | |
| 323 case SDL_EFSEEK: | |
| 324 SDL_SetError("Error seeking in datastream"); | |
| 325 break; | |
| 326 default: | |
| 327 SDL_SetError("Unknown SDL error"); | |
| 328 break; | |
| 329 } | |
| 330 } | |
| 331 | |
| 332 #ifdef TEST_ERROR | |
| 333 int main(int argc, char *argv[]) | |
| 334 { | |
| 335 char buffer[BUFSIZ+1]; | |
| 336 | |
| 337 SDL_SetError("Hi there!"); | |
| 338 printf("Error 1: %s\n", SDL_GetError()); | |
| 339 SDL_ClearError(); | |
| 340 memset(buffer, '1', BUFSIZ); | |
| 341 buffer[BUFSIZ] = 0; | |
| 342 SDL_SetError("This is the error: %s (%f)", buffer, 1.0); | |
| 343 printf("Error 2: %s\n", SDL_GetError()); | |
| 344 exit(0); | |
| 345 } | |
| 346 #endif |