New <case.h> header and macro.

This provides a portable case statement implemented directly
as switch on GNU Awk, and using other approaches on other Awks
that do not have switch.

1 files changed, 43 insertions, 0 deletions

diff --git a/cppawk-include/base.h b/cppawk-include/base.h
new file mode 100644
index 0000000..1f060cb
--- /dev/null
+++ b/cppawk-include/base.h
@@ -0,0 +1,43 @@
+// cppawk: C preprocessor wrapper around awk
+// Kaz Kylheku <kaz@kylheku.com>
+//
+// BSD-2 License
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice,
+//    this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation
+//    and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef __CPPAWK_BASE_H
+#define __CPPAWK_BASE_H
+
+#if __gawk__ && !defined __gawk_ver
+#define __gawk_ver 040000
+#endif
+
+#define __cat(a, b) a ## b
+#define __xcat(a, b) __cat(a, b)
+#define __g(name) __xcat(name, __LINE__)
+
+#define __error(...) { printf(__VA_ARGS__); print; exit 1 }
+
+#define __present(arg) ((arg) != "" || (arg) != 0)
+
+#endif