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Fix errno_md POSIX strerror_r loop bugs (Alexander Nasonov)

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[SVN r36446]
This commit is contained in:
Beman Dawes
2006-12-18 12:12:26 +00:00
parent 2cb2125ac9
commit 5688d4a3a2
1 changed files with 22 additions and 8 deletions
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18
src/error_code.cpp
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@@ -198,21 +198,35 @@ namespace
int result; int result;
for (;;) for (;;)
{ {
if ( (result = strerror_r( ec.value(), bp, sz )) != 0 ) // strerror_r returns 0 on success, otherwise ERANGE if buffer too small,
// EINVAL if ec.value() not a valid error number
if ( (result = strerror_r( ec.value(), bp, sz )) == 0 )
break;
else
{ {
# if defined(__linux) # if defined(__linux)
// Linux strerror_r returns -1 on error, with error number in errno
result = errno; result = errno;
# endif # endif
if ( result != ERANGE ) break; if ( result != ERANGE ) break;
}
if ( sz > sizeof(buf) ) std::free( bp ); if ( sz > sizeof(buf) ) std::free( bp );
sz *= 2; sz *= 2;
if ( (bp = static_cast<char*>(std::malloc( sz ))) == 0 ) if ( (bp = static_cast<char*>(std::malloc( sz ))) == 0 )
return std::string( "ENOMEM" ); return std::string( "ENOMEM" );
} }
}
try
{
std::string msg( ( result == EINVAL ) ? "EINVAL" : bp ); std::string msg( ( result == EINVAL ) ? "EINVAL" : bp );
if ( sz > sizeof(buf) ) std::free( bp ); if ( sz > sizeof(buf) ) std::free( bp );
sz = 0;
return msg; return msg;
}
catch(...)
{
if ( sz > sizeof(buf) ) std::free( bp );
throw;
}
# endif # endif
# endif # endif
} }