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//
// Implements simple string class 'str'
//
# include "str.h"
# include <string.h>
# include <memory.h>
# if defined( _MSC_VER )
# pragma warning(disable:4505)
# endif
# define STDLEN 32
extern "C" void * malloc (unsigned sz);
extern "C" void free (void * ptr);
# if defined( PLACEMENT_NEW_BUG )
inline void *
operator new (unsigned sz, short allocsz)
{
return malloc (sz + allocsz);
}
# else
void *
refstr::operator new (unsigned sz, short allocsz)
{
return malloc (sz + allocsz);
}
# endif
void
str::_strinit (char const * s, short len, short siz)
{
if (len < 0)
len = (short) ((s) ? strlen (s) : 0);
if (siz < 0)
siz = STDLEN;
if (siz < len + 1)
siz = short(len + 1);
strdata = new(siz) refstr(len, siz);
if (s && len)
memcpy (c_ptr(), s, len);
}
// Called whenever string is to be modified or grown
int
str::_chksize (short sz)
{
refstr * old = 0;
if (strdata->_refs > 1) // Need to dup memory
--strdata->_refs; // Dec existing string reference
else if (sz >= size())
old = strdata;
else
return 0;
_strinit (c_ptr(), length(), sz);
delete old;
return 1;
}
str &
str::operator= (str const & s)
{
if (&s != this)
{
if (!--strdata->_refs)
delete strdata;
strdata = s.strdata;
++strdata->_refs;
}
return *this;
}
str &
str::operator= (char const * s)
{
if (s != c_ptr())
{
short len = (short) strlen (s);
_chksize (len);
memcpy (c_ptr(), s, len + 1);
strdata->_length = len;
}
return *this;
}
str &
str::operator= (char c)
{
_chksize (1);
*c_ptr() = c;
strdata->_length = 1;
return *this;
}
short
str::insert (short pos, char const * s, short len)
{
if (len < 0)
len = (short) strlen (s);
if (len)
{
short leng = strdata->_length;
if (pos < 0 || pos > leng)
pos = leng;
_chksize (short(leng + len));
char * buf = c_ptr();
if (pos < leng)
memmove (buf + pos + len, buf + pos, leng - pos);
memcpy (buf + pos, s, len);
strdata->_length += len;
}
return length();
}
short
str::remove (short pos, short len)
{
if (pos >= 0 && pos < length())
{
short leng = strdata->_length;
if (len < 0 || (pos + len) > leng)
len = short(leng - pos);
if (len)
{
_chksize (0);
char * buf = c_ptr();
memcpy (buf + pos, buf + pos + len, leng - (pos + len));
strdata->_length -= len;
}
}
return length();
}
short
str::replace (short pos, char const * s, short clen, short len)
{
if (pos >= 0)
{
short leng = strdata->_length;
if (clen < 0 || (pos + clen) > leng)
clen = short(leng - pos);
if (len < 0)
len = (short) strlen (s);
if (pos > leng)
pos = leng;
_chksize (short(leng - clen + len));
char * buf = c_ptr();
if (clen != len && clen)
memmove (buf + pos + len, buf + pos + clen,
leng - (pos + clen - len));
if (len)
memcpy (buf + pos, s, len);
strdata->_length += short(len - clen);
}
return length();
}
str &
str::left (short len, char padch)
{
if (len < 0)
return right (short(-len), padch);
short leng = strdata->_length;
if (len != leng)
{
_chksize (len);
if (len > leng)
memset (strdata->ptr() + leng, padch, leng - len);
strdata->_length = len;
}
return *this;
}
str &
str::right (short len, char padch)
{
if (len < 0)
return left(-1, padch);
short leng = strdata->_length;
if (len != leng)
{
_chksize (len);
if (len > leng)
{
char * buf = strdata->ptr();
memmove (buf + len - leng, buf, leng);
memset (buf, padch, len - leng);
}
strdata->_length = len;
}
return *this;
}
str &
str::mid (short pos, short len, char padch)
{
if (pos <= 0)
return left(len, padch);
short leng = strdata->_length;
if (pos > leng)
pos = leng;
if (leng < len) // Are we padding?
{
_chksize (len);
char * buf = strdata->ptr();
short nlen = short((len - (leng - pos)) / 2);
if (nlen > 0)
{
memmove (buf, buf + pos, leng - pos);
memset (buf + leng - pos, padch, nlen);
strdata->_length -= short(pos - nlen);
}
}
return right (len, padch);
}
int
str::_concat (char const * s, short len)
{
if (len < 0)
len = (short) strlen (s);
if (len)
{
_chksize (short(len + length()));
memcpy (c_ptr() + length(), s, len);
strdata->_length += len;
}
return length();
}
short
str::removech (char const * clist)
{
short result = 0;
if (*clist)
{
char * buf, * sub;
buf = sub = strdata->ptr();
short nlen = strdata->_length;
for (short i = 0; i < nlen; ++i)
{
if (strchr (clist, *buf) == 0)
{
if (result)
*sub = *buf;
++sub;
}
else
{
if (!result)
_chksize (0);
++result;
}
++buf;
}
strdata->_length = short(nlen - result);
}
return result;
}
short
str::countch (char const * clist)
{
short result = 0;
if (*clist)
{
char * buf = strdata->ptr();
short nlen = strdata->_length;
for (short i = 0; i < nlen; ++i, ++buf)
if (strchr (clist, *buf) != 0)
++result;
}
return result;
}
str
left (str const & s, short len, char padch)
{
str n(s);
return n.left(len, padch);
}
str
right (str const & s, short len, char padch)
{
str n(s);
return n.right(len, padch);
}
str
mid (str const & s, short pos, short len, char padch)
{
str n(s);
return n.mid(pos, len, padch);
}
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