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1a7aec0731
* src/support/docstring.C (do_get): use reserve() and the += operator in order to avoid a possible buffer overrun. git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16070 a592a061-630c-0410-9148-cb99ea01b6c8
501 lines
13 KiB
C
501 lines
13 KiB
C
/**
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* \file docstring.C
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Georg Baum
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "docstring.h"
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#include "unicode.h"
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#include <locale>
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#include <iostream>
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#include <boost/assert.hpp>
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namespace lyx {
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docstring const from_ascii(char const * ascii)
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{
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docstring s;
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for (char const * c = ascii; *c; ++c) {
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BOOST_ASSERT(static_cast<unsigned char>(*c) < 0x80);
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s.push_back(*c);
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}
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return s;
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}
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docstring const from_ascii(std::string const & ascii)
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{
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int const len = ascii.length();
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for (int i = 0; i < len; ++i)
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BOOST_ASSERT(static_cast<unsigned char>(ascii[i]) < 0x80);
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return docstring(ascii.begin(), ascii.end());
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}
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std::string const to_ascii(docstring const & ucs4)
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{
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int const len = ucs4.length();
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std::string ascii;
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ascii.resize(len);
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for (int i = 0; i < len; ++i) {
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BOOST_ASSERT(ucs4[i] < 0x80);
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ascii[i] = static_cast<char>(ucs4[i]);
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}
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return ascii;
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}
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void utf8_to_ucs4(std::string const & utf8, docstring & ucs4)
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{
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size_t n = utf8.size();
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// as utf8 is a multi-byte encoding, there would be at most
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// n characters:
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ucs4.resize(n);
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if (n == 0)
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return;
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int maxoutsize = n * 4;
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// basic_string::data() is not recognized by some old gcc version
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// so we use &(ucs4[0]) instead.
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char * outbuf = (char *)(&(ucs4[0]));
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int bytes = utf8ToUcs4().convert(utf8.c_str(), n, outbuf, maxoutsize);
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// adjust to the real converted size
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ucs4.resize(bytes/4);
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}
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docstring const from_utf8(std::string const & utf8)
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{
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docstring ucs4;
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utf8_to_ucs4(utf8, ucs4);
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return ucs4;
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}
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std::string const to_utf8(docstring const & ucs4)
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{
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std::vector<char> const utf8 =
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ucs4_to_utf8(ucs4.data(), ucs4.size());
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return std::string(utf8.begin(), utf8.end());
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}
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bool operator==(lyx::docstring const & l, char const * r)
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{
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int const len = l.length();
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for (int i = 0; i < len; ++i) {
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BOOST_ASSERT(static_cast<unsigned char>(r[i]) < 0x80);
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if (!r[i])
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return false;
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if (l[i] != lyx::docstring::value_type(r[i]))
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return false;
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}
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return r[len] == '\0';
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}
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lyx::docstring operator+(lyx::docstring const & l, char const * r)
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{
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lyx::docstring s(l);
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for (char const * c = r; *c; ++c) {
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BOOST_ASSERT(static_cast<unsigned char>(*c) < 0x80);
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s.push_back(*c);
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}
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return s;
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}
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lyx::docstring operator+(char const * l, lyx::docstring const & r)
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{
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lyx::docstring s;
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for (char const * c = l; *c; ++c) {
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BOOST_ASSERT(static_cast<unsigned char>(*c) < 0x80);
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s.push_back(*c);
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}
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s += r;
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return s;
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}
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lyx::docstring operator+(lyx::docstring const & l, char r)
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{
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BOOST_ASSERT(static_cast<unsigned char>(r) < 0x80);
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return l + lyx::docstring::value_type(r);
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}
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lyx::docstring operator+(char l, lyx::docstring const & r)
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{
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BOOST_ASSERT(static_cast<unsigned char>(l) < 0x80);
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return lyx::docstring::value_type(l) + r;
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}
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lyx::docstring & operator+=(lyx::docstring & l, char const * r)
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{
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for (char const * c = r; *c; ++c) {
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BOOST_ASSERT(static_cast<unsigned char>(*c) < 0x80);
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l.push_back(*c);
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}
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return l;
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}
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lyx::docstring & operator+=(lyx::docstring & l, char r)
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{
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BOOST_ASSERT(static_cast<unsigned char>(r) < 0x80);
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l.push_back(r);
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return l;
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}
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} // namespace lyx
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#if (!defined(HAVE_WCHAR_T) || SIZEOF_WCHAR_T != 4) && defined(__GNUC__)
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// gcc does not have proper locale facets for lyx::char_type if
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// sizeof(wchar_t) == 2, so we have to implement them on our own.
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// We get undefined references to these virtual methods. This looks like
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// a bug in gcc. The implementation here does not do anything useful, since
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// it is overriden in ascii_ctype_facet.
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namespace std {
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template<> ctype<lyx::char_type>::~ctype() {}
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template<> bool
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ctype<lyx::char_type>::do_is(ctype<lyx::char_type>::mask, lyx::char_type) const { return false; }
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template<> lyx::char_type const *
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ctype<lyx::char_type>::do_is(const lyx::char_type *, const lyx::char_type *, ctype<lyx::char_type>::mask *) const { return 0; }
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template<> const lyx::char_type *
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ctype<lyx::char_type>::do_scan_is(ctype<lyx::char_type>::mask, const lyx::char_type *, const lyx::char_type *) const { return 0; }
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template<> const lyx::char_type *
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ctype<lyx::char_type>::do_scan_not(ctype<lyx::char_type>::mask, const lyx::char_type *, const lyx::char_type *) const { return 0; }
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template<> lyx::char_type ctype<lyx::char_type>::do_toupper(lyx::char_type) const { return 0; }
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template<> const lyx::char_type * ctype<lyx::char_type>::do_toupper(lyx::char_type *, lyx::char_type const *) const { return 0; }
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template<> lyx::char_type ctype<lyx::char_type>::do_tolower(lyx::char_type) const { return 0; }
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template<> const lyx::char_type * ctype<lyx::char_type>::do_tolower(lyx::char_type *, lyx::char_type const *) const { return 0; }
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template<> lyx::char_type ctype<lyx::char_type>::do_widen(char) const { return 0; }
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template<> const char *
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ctype<lyx::char_type>::do_widen(const char *, const char *, lyx::char_type *) const { return 0; }
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template<> char
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ctype<lyx::char_type>::do_narrow(const lyx::char_type, char) const { return 0; }
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template<> const lyx::char_type *
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ctype<lyx::char_type>::do_narrow(const lyx::char_type *, const lyx::char_type *, char, char *) const { return 0; }
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}
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namespace lyx {
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class ctype_failure : public std::bad_cast {
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public:
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ctype_failure() throw() : std::bad_cast() {}
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virtual ~ctype_failure() throw() {}
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virtual const char* what() const throw()
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{
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return "The ctype<lyx::char_type> locale facet does only support ASCII characters on this platform.";
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}
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};
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class num_put_failure : public std::bad_cast {
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public:
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num_put_failure() throw() : std::bad_cast() {}
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virtual ~num_put_failure() throw() {}
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virtual const char* what() const throw()
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{
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return "The num_put locale facet does only support ASCII characters on this platform.";
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}
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};
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/// ctype facet for UCS4 characters. The implementation does only support pure
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/// ASCII, since we do not need anything else for now.
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/// The code is partly stolen from std::ctype<wchar_t> from gcc.
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class ascii_ctype_facet : public std::ctype<lyx::char_type>
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{
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public:
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typedef lyx::char_type char_type;
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typedef wctype_t wmask_type;
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explicit ascii_ctype_facet(size_t refs = 0) : std::ctype<char_type>(refs)
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{
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M_initialize_ctype();
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}
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protected:
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bool M_narrow_ok;
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char M_narrow[128];
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wint_t M_widen[1 + static_cast<unsigned char>(-1)];
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mask M_bit[16];
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wmask_type M_wmask[16];
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wmask_type M_convert_to_wmask(const mask m) const
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{
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wmask_type ret;
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switch (m) {
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case space: ret = wctype("space"); break;
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case print: ret = wctype("print"); break;
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case cntrl: ret = wctype("cntrl"); break;
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case upper: ret = wctype("upper"); break;
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case lower: ret = wctype("lower"); break;
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case alpha: ret = wctype("alpha"); break;
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case digit: ret = wctype("digit"); break;
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case punct: ret = wctype("punct"); break;
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case xdigit: ret = wctype("xdigit"); break;
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case alnum: ret = wctype("alnum"); break;
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case graph: ret = wctype("graph"); break;
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default: ret = wmask_type();
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}
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return ret;
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}
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void M_initialize_ctype()
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{
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wint_t i;
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for (i = 0; i < 128; ++i) {
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const int c = wctob(i);
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if (c == EOF)
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break;
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else
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M_narrow[i] = static_cast<char>(c);
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}
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if (i == 128)
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M_narrow_ok = true;
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else
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M_narrow_ok = false;
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for (size_t i = 0; i < sizeof(M_widen) / sizeof(wint_t); ++i)
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M_widen[i] = btowc(i);
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for (size_t i = 0; i <= 15; ++i) {
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M_bit[i] = static_cast<mask>(1 << i);
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M_wmask[i] = M_convert_to_wmask(M_bit[i]);
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}
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}
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virtual ~ascii_ctype_facet() {}
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char_type do_toupper(char_type c) const
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{
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if (c >= 0x80)
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throw ctype_failure();
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return toupper(static_cast<int>(c));
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}
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char_type const * do_toupper(char_type * lo, char_type const * hi) const
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{
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while (lo < hi) {
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if (*lo >= 0x80)
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throw ctype_failure();
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*lo = toupper(static_cast<int>(*lo));
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++lo;
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}
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return hi;
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}
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char_type do_tolower(char_type c) const
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{
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if (c >= 0x80)
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throw ctype_failure();
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return tolower(c);
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}
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char_type const * do_tolower(char_type * lo, char_type const * hi) const
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{
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while (lo < hi) {
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if (*lo >= 0x80)
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throw ctype_failure();
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*lo = tolower(*lo);
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++lo;
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}
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return hi;
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}
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bool do_is(mask m, char_type c) const
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{
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if (c >= 0x80)
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throw ctype_failure();
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// The code below works because c is in the ASCII range.
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// We could not use iswctype() which is designed for a 2byte
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// whar_t without encoding conversion otherwise.
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bool ret = false;
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// Generically, 15 (instead of 10) since we don't know the numerical
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// encoding of the various categories in /usr/include/ctype.h.
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const size_t bitmasksize = 15;
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for (size_t bitcur = 0; bitcur <= bitmasksize; ++bitcur)
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if (m & M_bit[bitcur] &&
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iswctype(static_cast<int>(c), M_wmask[bitcur])) {
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ret = true;
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break;
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}
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return ret;
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}
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char_type const * do_is(char_type const * lo, char_type const * hi, mask * vec) const
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{
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for (;lo < hi; ++vec, ++lo) {
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if (*lo >= 0x80)
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throw ctype_failure();
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// The code below works because c is in the ASCII range.
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// We could not use iswctype() which is designed for a 2byte
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// whar_t without encoding conversion otherwise.
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// Generically, 15 (instead of 10) since we don't know the numerical
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// encoding of the various categories in /usr/include/ctype.h.
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const size_t bitmasksize = 15;
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mask m = 0;
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for (size_t bitcur = 0; bitcur <= bitmasksize; ++bitcur)
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if (iswctype(static_cast<int>(*lo), M_wmask[bitcur]))
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m |= M_bit[bitcur];
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*vec = m;
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}
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return hi;
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}
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char_type const * do_scan_is(mask m, char_type const * lo, char_type const * hi) const
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{
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while (lo < hi && !this->do_is(m, *lo))
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++lo;
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return lo;
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}
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char_type const * do_scan_not(mask m, char_type const * lo, char_type const * hi) const
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{
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while (lo < hi && this->do_is(m, *lo) != 0)
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++lo;
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return lo;
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}
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char_type do_widen(char c) const
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{
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if (static_cast<unsigned char>(c) < 0x80)
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return c;
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throw ctype_failure();
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}
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const char* do_widen(const char* lo, const char* hi, char_type* dest) const
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{
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while (lo < hi) {
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if (static_cast<unsigned char>(*lo) >= 0x80)
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throw ctype_failure();
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*dest = *lo;
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++lo;
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++dest;
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}
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return hi;
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}
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char do_narrow(char_type wc, char) const
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{
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if (wc < 0x80)
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return static_cast<char>(wc);
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throw ctype_failure();
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}
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const char_type * do_narrow(const char_type * lo, const char_type * hi, char, char * dest) const
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{
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while (lo < hi) {
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if (*lo < 0x80)
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*dest = static_cast<char>(*lo);
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else
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throw ctype_failure();
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++lo;
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++dest;
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}
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return hi;
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}
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};
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/// Facet for outputting numbers to odocstreams as ascii.
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/// Here we simply need defining the virtual do_put functions.
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class ascii_num_put_facet : public std::num_put<lyx::char_type, std::ostreambuf_iterator<lyx::char_type, std::char_traits<lyx::char_type> > >
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{
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typedef std::ostreambuf_iterator<lyx::char_type, std::char_traits<lyx::char_type> > iter_type;
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public:
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ascii_num_put_facet(size_t refs = 0) : std::num_put<lyx::char_type, iter_type>(refs) {}
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/// Facet for converting numbers to ascii strings.
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class string_num_put_facet : public std::num_put<char, std::basic_string<char>::iterator>
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{
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public:
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string_num_put_facet() : std::num_put<char, std::basic_string<char>::iterator>(1) {}
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};
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protected:
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iter_type
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do_put(iter_type oit, std::ios_base & b, char_type fill, long v) const
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{
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if (fill >= 0x80)
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throw num_put_failure();
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std::string s;
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// 64 is large enough
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s.resize(64);
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string_num_put_facet f;
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std::string::const_iterator cit = s.begin();
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std::string::const_iterator end =
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f.put(s.begin(), b, fill, v);
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for (; cit != end; ++cit, ++oit)
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*oit = *cit;
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return oit;
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}
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};
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/// Facet for inputting ascii representations of numbers from idocstreams.
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/// Here we simply need defining the virtual do_get functions.
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class ascii_num_get_facet : public std::num_get<lyx::char_type, std::istreambuf_iterator<lyx::char_type, std::char_traits<lyx::char_type> > >
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{
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typedef std::istreambuf_iterator<lyx::char_type, std::char_traits<lyx::char_type> > iter_type;
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public:
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ascii_num_get_facet(size_t refs = 0) : std::num_get<lyx::char_type, iter_type>(refs) {}
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/// Facet for converting ascii representation of numbers to a value.
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class string_num_get_facet : public std::num_get<char, std::basic_string<char>::iterator>
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{
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public:
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string_num_get_facet() : std::num_get<char, std::basic_string<char>::iterator>(1) {}
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};
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private:
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bool isNumpunct(lyx::char_type const c) const
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{
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/// Only account for the standard numpunct "C" locale facet.
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return c < 0x80 && (c == '-' || c == '+' || isdigit(c)
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|| ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F')
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|| c == 'x' || c == 'X');
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}
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protected:
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iter_type
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do_get(iter_type iit, iter_type eit, std::ios_base & b,
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std::ios_base::iostate & err, long & v) const
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{
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std::string s;
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s.reserve(64);
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for (; iit != eit && isNumpunct(*iit); ++iit)
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s += static_cast<char>(*iit);
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string_num_get_facet f;
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f.get(s.begin(), s.end(), b, err, v);
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return iit;
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}
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};
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/// class to add our facets to the global locale
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class locale_initializer {
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public:
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locale_initializer()
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{
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std::locale global;
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std::locale const loc1(global, new ascii_ctype_facet);
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std::locale const loc2(loc1, new ascii_num_put_facet);
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std::locale const loc3(loc2, new ascii_num_get_facet);
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std::locale::global(loc3);
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}
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};
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namespace {
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/// make sure that our facets get used
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static locale_initializer initializer;
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}
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}
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#endif
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