1 files changed, 92 insertions, 0 deletions
diff --git a/third_party/nix/src/libutil/istringstream_nocopy.hh b/third_party/nix/src/libutil/istringstream_nocopy.hh
new file mode 100644
index 000000000000..f7beac578e39
--- /dev/null
+++ b/third_party/nix/src/libutil/istringstream_nocopy.hh
@@ -0,0 +1,92 @@
+/* This file provides a variant of std::istringstream that doesn't
+   copy its string argument. This is useful for large strings. The
+   caller must ensure that the string object is not destroyed while
+   it's referenced by this object. */
+
+#pragma once
+
+#include <string>
+#include <iostream>
+
+template <class CharT, class Traits = std::char_traits<CharT>, class Allocator = std::allocator<CharT>>
+class basic_istringbuf_nocopy : public std::basic_streambuf<CharT, Traits>
+{
+public:
+    typedef std::basic_string<CharT, Traits, Allocator> string_type;
+
+    typedef typename std::basic_streambuf<CharT, Traits>::off_type off_type;
+
+    typedef typename std::basic_streambuf<CharT, Traits>::pos_type pos_type;
+
+    typedef typename std::basic_streambuf<CharT, Traits>::int_type int_type;
+
+    typedef typename std::basic_streambuf<CharT, Traits>::traits_type traits_type;
+
+private:
+    const string_type & s;
+
+    off_type off;
+
+public:
+    basic_istringbuf_nocopy(const string_type & s) : s{s}, off{0}
+    {
+    }
+
+private:
+    pos_type seekoff(off_type off, std::ios_base::seekdir dir, std::ios_base::openmode which)
+    {
+        if (which & std::ios_base::in) {
+            this->off = dir == std::ios_base::beg
+                ? off
+                : (dir == std::ios_base::end
+                    ? s.size() + off
+                    : this->off + off);
+        }
+        return pos_type(this->off);
+    }
+
+    pos_type seekpos(pos_type pos, std::ios_base::openmode which)
+    {
+        return seekoff(pos, std::ios_base::beg, which);
+    }
+
+    std::streamsize showmanyc()
+    {
+        return s.size() - off;
+    }
+
+    int_type underflow()
+    {
+        if (typename string_type::size_type(off) == s.size())
+            return traits_type::eof();
+        return traits_type::to_int_type(s[off]);
+    }
+
+    int_type uflow()
+    {
+        if (typename string_type::size_type(off) == s.size())
+            return traits_type::eof();
+        return traits_type::to_int_type(s[off++]);
+    }
+
+    int_type pbackfail(int_type ch)
+    {
+        if (off == 0 || (ch != traits_type::eof() && ch != s[off - 1]))
+            return traits_type::eof();
+
+        return traits_type::to_int_type(s[--off]);
+    }
+
+};
+
+template <class CharT, class Traits = std::char_traits<CharT>, class Allocator = std::allocator<CharT>>
+class basic_istringstream_nocopy : public std::basic_iostream<CharT, Traits>
+{
+    typedef basic_istringbuf_nocopy<CharT, Traits, Allocator> buf_type;
+    buf_type buf;
+public:
+    basic_istringstream_nocopy(const typename buf_type::string_type & s) :
+        std::basic_iostream<CharT, Traits>(&buf), buf(s) {};
+};
+
+typedef basic_istringstream_nocopy<char> istringstream_nocopy;