mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-11-27 08:05:41 +00:00
89 lines
4 KiB
C++
89 lines
4 KiB
C++
#ifndef _C4_STD_VECTOR_HPP_
|
|
#define _C4_STD_VECTOR_HPP_
|
|
|
|
/** @file vector.hpp provides conversion and comparison facilities
|
|
* from/between std::vector<char> to c4::substr and c4::csubstr.
|
|
* @todo add to_span() and friends
|
|
*/
|
|
|
|
#ifndef C4CORE_SINGLE_HEADER
|
|
#include "c4/substr.hpp"
|
|
#endif
|
|
|
|
#include <vector>
|
|
|
|
namespace c4 {
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
/** get a substr (writeable string view) of an existing std::vector<char> */
|
|
template<class Alloc>
|
|
c4::substr to_substr(std::vector<char, Alloc> &vec)
|
|
{
|
|
char *data = vec.empty() ? nullptr : vec.data(); // data() may or may not return a null pointer.
|
|
return c4::substr(data, vec.size());
|
|
}
|
|
|
|
/** get a csubstr (read-only string) view of an existing std::vector<char> */
|
|
template<class Alloc>
|
|
c4::csubstr to_csubstr(std::vector<char, Alloc> const& vec)
|
|
{
|
|
const char *data = vec.empty() ? nullptr : vec.data(); // data() may or may not return a null pointer.
|
|
return c4::csubstr(data, vec.size());
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// comparisons between substrings and std::vector<char>
|
|
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator!= (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss != to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator== (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss == to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator>= (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss >= to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator> (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss > to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator<= (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss <= to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator< (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss < to_csubstr(s); }
|
|
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator!= (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss != to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator== (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss == to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator>= (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss <= to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator> (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss < to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator<= (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss >= to_csubstr(s); }
|
|
template<class Alloc> C4_ALWAYS_INLINE bool operator< (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss > to_csubstr(s); }
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
/** copy a std::vector<char> to a writeable string view */
|
|
template<class Alloc>
|
|
inline size_t to_chars(c4::substr buf, std::vector<char, Alloc> const& s)
|
|
{
|
|
C4_ASSERT(!buf.overlaps(to_csubstr(s)));
|
|
size_t len = buf.len < s.size() ? buf.len : s.size();
|
|
// calling memcpy with null strings is undefined behavior
|
|
// and will wreak havoc in calling code's branches.
|
|
// see https://github.com/biojppm/rapidyaml/pull/264#issuecomment-1262133637
|
|
if(len > 0)
|
|
{
|
|
memcpy(buf.str, s.data(), len);
|
|
}
|
|
return s.size(); // return the number of needed chars
|
|
}
|
|
|
|
/** copy a string view to an existing std::vector<char> */
|
|
template<class Alloc>
|
|
inline bool from_chars(c4::csubstr buf, std::vector<char, Alloc> * s)
|
|
{
|
|
s->resize(buf.len);
|
|
C4_ASSERT(!buf.overlaps(to_csubstr(*s)));
|
|
// calling memcpy with null strings is undefined behavior
|
|
// and will wreak havoc in calling code's branches.
|
|
// see https://github.com/biojppm/rapidyaml/pull/264#issuecomment-1262133637
|
|
if(buf.len > 0)
|
|
{
|
|
memcpy(&(*s)[0], buf.str, buf.len);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
} // namespace c4
|
|
|
|
#endif // _C4_STD_VECTOR_HPP_
|