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// This is part of the iostream library, providing input/output for C++.
// Copyright (C) 1991 Per Bothner.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free
// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#ifdef __GNUG__
#pragma implementation
#endif
#include "ioprivate.h"
#include <strstream.h>
static void* default_alloc(_G_size_t size)
{
return (void*)new char[size];
}
static void default_free(void* ptr)
{
delete [] (char*)ptr;
}
istrstream::istrstream(const char *cp, int n)
{
init(new strstreambuf(cp, n));
}
ostrstream::ostrstream()
{
init(new strstreambuf());
}
strstreambase::strstreambase(char *cp, int n, int mode)
{
char *pstart;
if (mode == ios::app || mode == ios::ate)
pstart = cp + strlen(cp);
else
pstart = cp;
init(new strstreambuf(cp, n, pstart));
}
char *strstreambuf::str()
{
freeze(1);
return base();
}
_G_size_t strstreambuf::pcount()
{
_G_size_t put_len = pptr() - pbase();
if (put_len < _len) put_len = _len;
return put_len;
}
int strstreambuf::overflow(int c /* = EOF */)
{
const int flush_only = c == EOF;
if (_flags & _S_NO_WRITES)
return flush_only ? 0 : EOF;
size_t pos = pptr() - pbase();
size_t get_pos = gptr() - pbase();
if (pos > _len) _len = pos;
if (pos >= blen() + flush_only) {
char *new_buf;
size_t new_size = 2 * blen();
if (frozen()) /* not allowed to enlarge */
return EOF;
new_buf = (char*)(*_allocate_buffer)(new_size);
memcpy(new_buf, base(), blen());
if (new_buf == NULL) {
// __ferror(fp) = 1;
return EOF;
}
#if 0
if (lenp == &_len) /* use '\0'-filling */
memset(new_buf + pos, 0, blen() - pos);
#endif
if (_base) {
(*_free_buffer)(_base);
_base = NULL; // So setb() won't try to delete _base.
}
setb(new_buf, new_buf + new_size, 1);
}
setp(base(), ebuf());
pbump(pos);
setg(base(), base() + get_pos, base() + _len);
if (!flush_only) {
*pptr() = (unsigned char) c;
pbump(1);
}
return c;
}
int strstreambuf::underflow()
{
size_t ppos = pptr() - pbase();
if (ppos > _len) _len = ppos;
setg(base(), gptr(), base() + _len);
if (gptr() < egptr())
return *gptr();
else
return EOF;
}
void strstreambuf::init_dynamic(_alloc_type alloc, _free_type free,
int initial_size)
{
_len = 0;
if (initial_size < 16)
initial_size = 16;
_allocate_buffer = alloc ? alloc : default_alloc;
_free_buffer = free ? free : default_free;
char * buf = (char*)(*_allocate_buffer)(initial_size);
setb(buf, buf + initial_size, 1);
setp(buf, buf + initial_size);
setg(buf, buf, buf);
}
void strstreambuf::init_static(char *ptr, int size, char *pstart)
{
if (size == 0)
size = strlen(ptr);
else if (size < 0) {
// If size is negative 'the characters are assumed to
// continue indefinitely.' This is kind of messy ...
#if 1
size = 512;
// Try increasing powers of 2, as long as we don't wrap around.
// This can lose in pathological cases (ptr near the end
// of the address space). A better solution might be to
// adjust the size on underflow/overflow. FIXME.
for (int s; s = 2*size, s > 0 && ptr + s > ptr && s < 0x4000000L; )
size = s;
size = s;
#else
// The following semi-portable kludge assumes that
// sizeof(unsigned long) == sizeof(char*). Hence,
// (unsigned long)(-1) should be the largest possible address.
unsigned long highest = (unsigned long)(-1);
// Pointers are signed on some brain-damaged systems, in
// which case we divide by two to get the maximum signed address.
if ((char*)highest < ptr)
highest >>= 1;
size = (char*)highest - ptr;
#endif
}
setb(ptr, ptr+size);
if (pstart) {
setp(ptr, ebuf());
pbump(pstart-ptr);
setg(ptr, ptr, pstart);
}
else {
setp(ptr, ptr);
setg(ptr, ptr, ebuf());
}
_len = egptr() - ptr;
}
void strstreambuf::init_static (const char *ptr, int size)
{
init_static((char*)ptr, size, NULL);
xsetflags(_S_NO_WRITES);
}
strstreambuf::~strstreambuf()
{
if (_base && !(_flags & _S_USER_BUF))
(_free_buffer)(_base);
_base = NULL;
}
streampos strstreambuf::seekoff(streamoff off, _seek_dir dir,
int mode /*=ios::in|ios::out*/)
{
size_t cur_size = pcount();
streampos new_pos = EOF;
// Move the get pointer, if requested.
if (mode & ios::in) {
switch (dir) {
case ios::end:
off += cur_size;
break;
case ios::cur:
off += gptr() - pbase();
break;
default: /*case ios::beg: */
break;
}
if (off < 0 || (size_t)off > cur_size)
return EOF;
setg(base(), base() + off, base() + cur_size);
new_pos = off;
}
// Move the put pointer, if requested.
if (mode & ios::out) {
switch (dir) {
case ios::end:
off += cur_size;
break;
case ios::cur:
off += pptr() - pbase();
break;
default: /*case ios::beg: */
break;
}
if (off < 0 || (size_t)off > cur_size)
return EOF;
pbump(base() + off - pptr());
new_pos = off;
}
return new_pos;
}
int strstreambuf::pbackfail(int c)
{
if ((_flags & _S_NO_WRITES) && c != EOF)
return EOF;
return backupbuf::pbackfail(c);
}
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