add lex example

1 files changed, 64 insertions, 0 deletions

diff --git a/examples/utils.h b/examples/utils.h
new file mode 100644
index 0000000..dc48a85
--- /dev/null
+++ b/examples/utils.h
@@ -0,0 +1,64 @@
+// examples/utils.h
+
+#ifndef INCLUDED_UTILS_H
+#define INCLUDED_UTILS_H
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#define CMMM__STRING_VIEW__STRIP_VENDOR
+#define CMMM__STRING_VIEW__SHORT_NAMESPACE
+#define CMMM__ARENA__STRIP_VENDOR
+
+#include "cmmm/string-view.h"
+#include "cmmm/arena.h"
+
+#define NOP() do {} while (0)
+
+#define UNUSED(EXP) ((void) EXP)
+
+#define ARRAY_LENGTH(ARR) (sizeof (ARR)/sizeof (*(ARR)))
+
+#ifndef NDEBUG
+#include <assert.h>
+#define ASSERT assert
+#else
+#define ASSERT(...) NOP ()
+#endif
+
+#define STRINGIFY(ARG) #ARG
+#define TO_STRING(ARG) STRINGIFY (ARG)
+
+#ifndef NDEBUG
+#define DEBUG(FMT, ...)                                                 \
+  fprintf (stderr, __FILE__ ":" TO_STRING (__LINE__) ": %s: " FMT "\n", \
+       __func__ __VA_OPT__ (,) __VA_ARGS__)
+#define LOG(FMT, ...)                                                 \
+  fprintf (stderr, __FILE__ ":" TO_STRING (__LINE__) ": %s: " FMT "\n", \
+       __func__ __VA_OPT__ (,) __VA_ARGS__)
+#else
+#define DEBUG(...) NOP ()
+#define LOG(FMT, ...)                                           \
+  fprintf (stderr, FMT "\n", __VA_OPT__ (,) __VA_ARGS__)
+#endif
+
+#define   ERROR(FMT, ...) LOG ("error: "   FMT __VA_OPT__ (,) __VA_ARGS__)
+#define WARNING(FMT, ...) LOG ("warning: " FMT __VA_OPT__ (,) __VA_ARGS__)
+#define  NOTICE(FMT, ...) LOG ("notice: "  FMT __VA_OPT__ (,) __VA_ARGS__)
+#define    INFO(FMT, ...) LOG ("info: "    FMT __VA_OPT__ (,) __VA_ARGS__)
+
+#ifndef NDEBUG
+#define ASSERT_MSG(EXP, FMT, ...) do if (!(EXP)) {      \
+      DEBUG (FMT __VA_OPT__ (,) __VA_ARGS__);           \
+      exit (EXIT_FAILURE);                              \
+    } while (0)
+#else
+#define ASSERT_MSG(EXP, FMT, ...) NOP ()
+#endif
+
+struct cmmm__sv mmap_whole (int fd);
+struct cmmm__sv read_until_eof (ARENA, int fd);
+
+#endif // INCLUDED_UTILS_H
+
+// examples/utils.c ends here