1 files changed, 88 insertions, 0 deletions
diff --git a/src/include/symbol.h b/src/include/symbol.h
new file mode 100644
index 0000000..047255d
--- /dev/null
+++ b/src/include/symbol.h
@@ -0,0 +1,88 @@
+/* Copyright (C) 1989-2023 Free Software Foundation, Inc.
+     Written by James Clark (jjc@jclark.com)
+
+This file is part of groff.
+
+groff is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+groff 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 General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include <stdint.h> // uintptr_t
+
+#define DONT_STORE 1
+#define MUST_ALREADY_EXIST 2
+
+class symbol {
+  static const char **table;
+  static int table_used;
+  static int table_size;
+  static char *block;
+  static int block_size;
+  const char *s;
+public:
+  symbol(const char *p, int how = 0);
+  symbol();
+  uintptr_t hash() const;
+  int operator ==(symbol) const;
+  int operator !=(symbol) const;
+  const char *contents() const;
+  int is_null() const;
+  int is_empty() const;
+};
+
+
+extern const symbol NULL_SYMBOL;
+extern const symbol EMPTY_SYMBOL;
+
+inline symbol::symbol() : s(0)
+{
+}
+
+inline int symbol::operator==(symbol p) const
+{
+  return s == p.s;
+}
+
+inline int symbol::operator!=(symbol p) const
+{
+  return s != p.s;
+}
+
+inline uintptr_t symbol::hash() const
+{
+  return reinterpret_cast<uintptr_t>(s);
+}
+
+inline const char *symbol::contents() const
+{
+  return s;
+}
+
+inline int symbol::is_null() const
+{
+  return s == 0;
+}
+
+inline int symbol::is_empty() const
+{
+  return s != 0 && *s == 0;
+}
+
+symbol concat(symbol, symbol);
+
+extern symbol default_symbol;
+
+// Local Variables:
+// fill-column: 72
+// mode: C++
+// End:
+// vim: set cindent noexpandtab shiftwidth=2 textwidth=72: