| 262 | #endif // DM_NO_ERRNO |
| 263 | |
| 264 | void dmStrError(char* dst, size_t size, int err) |
| 265 | { |
| 266 | if (dst == 0 || size == 0) |
| 267 | { |
| 268 | return; |
| 269 | } |
| 270 | |
| 271 | char scratch[256]; |
| 272 | const size_t scratch_size = sizeof(scratch); |
| 273 | size_t err_msg_len = 0; |
| 274 | int old_errno = errno; |
| 275 | char* retstr = 0; |
| 276 | |
| 277 | #ifdef DM_STRERROR_USE_POSIX |
| 278 | int ret = DM_STRERROR_FN(scratch, scratch_size, err); |
| 279 | |
| 280 | if (ret == 0 || ret == ERANGE) |
| 281 | { |
| 282 | // apparently windows returns a success ret value and a "Unknown error" string |
| 283 | // even if it's not a supported errno |
| 284 | if (dmStrCaseCmp("Unknown error", scratch) == 0) |
| 285 | { |
| 286 | dmSnPrintf(scratch, scratch_size, "Unknown error %d", err); |
| 287 | } |
| 288 | // Another platform returns "error_code=0xffffffff" |
| 289 | else if (strstr(scratch, "error_code=0x") == scratch) |
| 290 | { |
| 291 | dmSnPrintf(scratch, scratch_size, "Unknown error %d", err); |
| 292 | } |
| 293 | } |
| 294 | else |
| 295 | { |
| 296 | if (ret == EINVAL) |
| 297 | { |
| 298 | dmSnPrintf(scratch, scratch_size, "Unknown error %d", err); |
| 299 | } |
| 300 | else |
| 301 | { |
| 302 | dmSnPrintf(scratch, scratch_size, "Failed getting error (code %d)", ret); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | retstr = &scratch[0]; |
| 307 | #endif |
| 308 | |
| 309 | #ifdef DM_STRERROR_USE_GNU |
| 310 | // GNU version, char* returned |
| 311 | retstr = strerror_r(err, scratch, scratch_size); |
| 312 | #endif |
| 313 | |
| 314 | #ifdef DM_STRERROR_USE_UNSAFE |
| 315 | retstr = strerror(err); |
| 316 | #endif |
| 317 | |
| 318 | err_msg_len = strlen(retstr) + 1; |
| 319 | |
| 320 | // Restore errno in case strerror variants raised error |
| 321 | errno = old_errno; |