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template <size_t buffersize>
sizedpipestream<buffersize>::sizedpipestream()
: wbufferpos(0), rbufferpos(buffersize), rbuffersize(buffersize),
maxopsize(-1), is_eof(false), enable_multiline_strings(true)
{
// Give a compile time error if an invalid buffsize is specified
// This is necessary for much easier primitive reading/writing
// The buffer must be either 0 or at least large enough to hold any
// primitive (probably 8 or 16 bytes)
char buffer_size_must_be_0_or_over_16
[(buffersize != 0 && buffersize < sizeof(intmax_t)) ? -1 : 1];
buffer_size_must_be_0_or_over_16[0] = '\0';
// Create the pipe
pipe(fds);
}
template <size_t buffersize>
sizedpipestream<buffersize>::~sizedpipestream()
{
close();
}
template <size_t buffersize>
void sizedpipestream<buffersize>::close()
{
close_write();
close_read();
}
template <size_t buffersize>
void sizedpipestream<buffersize>::close_read()
{
if (fds[READ_END] == -1) return;
::close(fds[READ_END]);
fds[READ_END] = -1;
}
template <size_t buffersize>
void sizedpipestream<buffersize>::close_write()
{
if (fds[WRITE_END] == -1) return;
flush();
::close(fds[WRITE_END]);
fds[WRITE_END] = -1;
}
template <size_t buffersize>
int sizedpipestream<buffersize>::steal_output(int fd)
{
::close(fd);
dup2(fds[WRITE_END], fd);
return 0;
}
template <size_t buffersize>
int sizedpipestream<buffersize>::steal_input(int fd)
{
::close(fd);
dup2(fds[READ_END], fd);
return 0;
}
template <size_t buffersize>
int sizedpipestream<buffersize>::get_read_fd()
{
return fds[READ_END];
}
template <size_t buffersize>
int sizedpipestream<buffersize>::get_write_fd()
{
return fds[WRITE_END];
}
template <size_t buffersize>
void sizedpipestream<buffersize>::flush()
{
if (buffersize == 0 || wbufferpos == 0 || fds[WRITE_END] == -1)
return;
writen(fds[WRITE_END], &wbuffer[0], wbufferpos);
wbufferpos = 0;
}
template <size_t buffersize>
int sizedpipestream<buffersize>::fill(size_t byte_count)
{
if (buffersize == 0 || rbufferpos == 0 || fds[READ_END] == -1)
return -1;
if (buffersize - rbufferpos < byte_count)
{
memmove(&rbuffer[0], &rbuffer[rbufferpos], rbuffersize - rbufferpos);
rbuffersize -= rbufferpos;
rbufferpos = 0;
}
while (rbuffersize - rbufferpos < byte_count)
{
ssize_t read_count = ::read(fds[READ_END],
&rbuffer[rbuffersize],
buffersize - rbuffersize);
if (read_count == 0) return 0;
if (read_count == -1)
{
if (errno == EINTR) continue;
return -1;
}
rbuffersize += read_count;
}
return rbuffersize - rbufferpos;
}
template <size_t buffersize>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const string & str)
{
if (buffersize == 0)
{
writen(fds[WRITE_END], str.c_str(), str.length()+1);
return *this;
}
size_t len = str.length();
for (size_t i = 0; i < len; i++)
{
if (wbufferpos == buffersize) flush();
wbuffer[wbufferpos++] = str[i];
}
if (wbufferpos == buffersize) flush();
wbuffer[wbufferpos++] = '\0';
return *this;
}
template <size_t buffersize>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const char * str)
{
if (buffersize == 0)
{
writen(fds[WRITE_END], str, strlen(str)+1);
return *this;
}
for (size_t i = 0; str[i] != '\0'; i++)
{
if (wbufferpos == buffersize) flush();
wbuffer[wbufferpos++] = str[i];
}
if (wbufferpos == buffersize) flush();
wbuffer[wbufferpos++] = '\0';
return *this;
}
template <size_t buffersize>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(char * & str)
{
size_t capacity = 4;
str = new char[capacity];
size_t len = 0;
int error = 0;
char c = '\0';
do
{
error = read_primitive<char>(c);
if (len == maxopsize) continue;
if (len == capacity)
{
char * temp = str;
str = new char[capacity*2];
memcpy(str, temp, capacity);
capacity *= 2;
delete [] temp;
}
str[len++] = c;
} while (error > 0 && c != '\0' && (enable_multiline_strings || c != '\n'));
str[len-1] = '\0';
if (!enable_multiline_strings && len > 2 && str[len-2] == '\r')
str[len-2] = '\0';
maxopsize = -1;
return *this;
}
template <size_t buffersize>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(string & str)
{
char * cstr = NULL;
operator>>(cstr);
str = cstr;
delete [] cstr;
return *this;
}
template <size_t buffersize>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<
(pipestream_manip::enable_multiline_strings_t value)
{
enable_multiline_strings = value.value;
return *this;
}
template <size_t buffersize>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>
(pipestream_manip::setmax_t max)
{
maxopsize = max.max;
return *this;
}
template <size_t buffersize>
inline bool sizedpipestream<buffersize>::eof()
{ return is_eof; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const signed char & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const signed short & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const signed int & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const signed long & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const unsigned char & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const unsigned short & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const unsigned int & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator<<(const unsigned long & value)
{ return write_primitive(value); }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(signed char & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(signed short & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(signed int & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(signed long & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(unsigned char & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(unsigned short & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(unsigned int & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
inline sizedpipestream<buffersize> & sizedpipestream<buffersize>::operator>>(unsigned long & value)
{ read_primitive(value); return *this; }
template <size_t buffersize>
template <typename T>
sizedpipestream<buffersize> & sizedpipestream<buffersize>::write_primitive(T value)
{
if (fds[WRITE_END] == -1) return *this;
if (buffersize == 0)
{
writen(fds[WRITE_END], &value, sizeof value);
return *this;
}
if (buffersize - wbufferpos < sizeof value)
flush();
*reinterpret_cast<T*>(&wbuffer[wbufferpos]) = value;
wbufferpos += sizeof value;
return *this;
}
template <size_t buffersize>
template <typename T>
int sizedpipestream<buffersize>::read_primitive(T & value)
{
if (fds[READ_END] == -1) return -1;
if (buffersize == 0)
return readn(fds[READ_END], &value, sizeof value);
if (rbuffersize - rbufferpos < sizeof value)
{
int error = fill(sizeof value);
if (error == 0) is_eof = true;
if (error <= 0) return error;
}
value = *reinterpret_cast<T*>(&rbuffer[rbufferpos]);
rbufferpos += sizeof value;
return sizeof value;
}