1 files changed, 37 insertions, 0 deletions
diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..f8f6b1d
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,37 @@
+#ifndef DUCC_COMMON_H
+#define DUCC_COMMON_H
+
+#include "std.h"
+
+void fatal_error(const char* msg, ...);
+
+#define unreachable() fatal_error("%s:%d: unreachable", __FILE__, __LINE__)
+#define unimplemented() fatal_error("%s:%d: unimplemented", __FILE__, __LINE__)
+
+BOOL str_ends_with(const char* s, const char* suffix);
+
+struct StrBuilder {
+    size_t len;
+    size_t capacity;
+    char* buf;
+};
+typedef struct StrBuilder 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);
+
+struct StrArray {
+    size_t len;
+    size_t capacity;
+    const char** data;
+};
+typedef struct StrArray StrArray;
+
+void strings_init(StrArray* strings);
+void strings_reserve(StrArray* strings, size_t size);
+int strings_push(StrArray* strings, const char* str);
+
+#endif