Following program:
--------------- begin of code
#include <stdio.h>
#include <boost/system/error_code.hpp>
int main()
{
std::string s =
boost::system::generic_category().message(22);
printf("size=%lu, c_str=\"%s\".\n",
s.size(),
s.c_str());
return 0;
}
--------------- end of code
Give out following output:
--------------- begin of output
size=1628781863, c_str="Invalid argument".
--------------- end of output
If I try to use such string, for example:
std::string a("");
a += s;
program crashes.
The program was compiled from cygwin command line by
following commands:
--------------- begin of commands
g++ -c test.cpp
gcc -s test.o -lstdc++ -lboost_system
--------------- end of commands
I used fresh installed cygwin with following additional
packages:
Devel / gcc-core 5.2.0-1
Devel / gcc-g++ 5.2.0-1
Libs / libgcc1 5.2.0-1
Libs / libstdc++6 5.2.0-1
Devel / make 4.1-1
Libs / libboost-devel 1.58.0-1
Operating system: Windows XP, 32 bits, russian language
Processor: Intel Pentium 4 (3 GHz)
Version of installator: setup-x86.exe, 2.873
With libboost-devel 1.57.0-1 effect is the same.
With Windows 7, 64 bit, russian language, effect is the
same (with 32-bit and with 64-bit cygwin), with the
exception that another wrong values are exposed for
'size'.
When I compile boost from sources ('boost_1_59_0.7z' from
boost org), the same program is running as proper:
--------------- begin of correct output
size=16, c_str="Invalid argument".
--------------- end of correct output
Constant '22' corresponds to
'boost::asio::error::invalid_argument'. Some other ASIO
error codes also brings to the same effect. Aforementioned
code is used in handling of exceptions from ASIO functions
and brings to crashes in various unpredictable situations.
There is more real-life piece of code that produce same
error:
--------------- begin of example #2
#include <stdio.h>
#include <boost/asio.hpp>
int main()
{
boost::asio::ip::address_v4 a;
boost::system::error_code ec;
a.from_string("127.0.0.1111", ec);
std::string s = ec.message();
printf("size=%lu, c_str=\"%s\".\n",
s.size(),
s.c_str());
return 0;
}
--------------- end of example #2
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