1 files changed, 41 insertions, 0 deletions
diff --git a/src/lib/common.h b/src/lib/common.h
new file mode 100644
index 0000000..bb94e79
--- /dev/null
+++ b/src/lib/common.h
@@ -0,0 +1,41 @@
+#ifndef DUCC_COMMON_H
+#define DUCC_COMMON_H
+
+#include "ducc.h"
+
+_Noreturn void fatal_error(const char* msg, ...);
+
+// TODO
+#ifdef __ducc__
+#define unreachable() fatal_error("%s:%d: unreachable", __FILE__, __LINE__)
+#endif
+
+#define unimplemented() fatal_error("%s:%d: unimplemented", __FILE__, __LINE__)
+
+bool str_starts_with(const char* s, const char* prefix);
+bool str_ends_with(const char* s, const char* suffix);
+
+typedef struct {
+    size_t len;
+    size_t capacity;
+    char* buf;
+} StrBuilder;
+
+void strbuilder_init(StrBuilder* b);
+// `size` must include a trailing null byte.
+void strbuilder_reserve(StrBuilder* b, size_t size);
+void strbuilder_append_char(StrBuilder* b, int c);
+void strbuilder_append_string(StrBuilder* b, const char* s);
+
+typedef struct {
+    size_t len;
+    size_t capacity;
+    const char** data;
+} StrArray;
+
+void strings_init(StrArray* strings);
+void strings_reserve(StrArray* strings, size_t size);
+int strings_push(StrArray* strings, const char* str);
+void strings_pop(StrArray* strings);
+
+#endif