truck/Common/posix.cpp

// Truck Computer Dooom!
//
// Douglas Thrift
//
// $Id$

#ifdef _GNU_SOURCE
#undef _GNU_SOURCE
#endif

#define _XOPEN_SOURCE 600

#include <fcntl.h>

#include "posix.hpp"

namespace Posix
{

Error::Error() : code(errno)
{
        CheckError(::strerror_r(code, message, sizeof (message)));
}

int Open(const std::string &path, int flags, ::mode_t mode)
{
        return SysCall(::open, path.c_str(), flags, mode);
}

size_t Read(int fd, void *buffer, size_t bytes)
{
        return SysCall(::read, fd, buffer, bytes);
}

size_t ReadMost(int fd, void *buffer, size_t bytes)
{
        size_t rest(bytes);
        uint8_t *data = reinterpret_cast<uint8_t *>(buffer);

        while (rest != 0)
        {
                size_t read(Read(fd, data, rest));

                if (read == 0)
                        return bytes - rest;

                data += read;
                rest -= read;
        }

        return bytes;
}

}
Revision:	14
Committed:	2007-05-14T18:24:34-07:00 (18 years, 1 month ago) by douglas
File size:	788 byte(s)
Log Message:	Switch back from Menes C++ to stl and hacks.
#	Content
1	// Truck Computer Dooom!
2	//
3	// Douglas Thrift
4	//
5	// $Id$
6
7	#ifdef _GNU_SOURCE
8	#undef _GNU_SOURCE
9	#endif
10
11	#define _XOPEN_SOURCE 600
12
13	#include <fcntl.h>
14
15	#include "posix.hpp"
16
17	namespace Posix
18	{
19
20	Error::Error() : code(errno)
21	{
22	CheckError(::strerror_r(code, message, sizeof (message)));
23	}
24
25	int Open(const std::string &path, int flags, ::mode_t mode)
26	{
27	return SysCall(::open, path.c_str(), flags, mode);
28	}
29
30	size_t Read(int fd, void *buffer, size_t bytes)
31	{
32	return SysCall(::read, fd, buffer, bytes);
33	}
34
35	size_t ReadMost(int fd, void *buffer, size_t bytes)
36	{
37	size_t rest(bytes);
38	uint8_t data = reinterpret_cast<uint8_t >(buffer);
39
40	while (rest != 0)
41	{
42	size_t read(Read(fd, data, rest));
43
44	if (read == 0)
45	return bytes - rest;
46
47	data += read;
48	rest -= read;
49	}
50
51	return bytes;
52	}
53
54	}