meta: add internal common library

CMakeLists.txt

@@ -6,6 +6,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 set(Bluelib_STATIC TRUE)
 find_package(Bluelib REQUIRED)
 
+add_subdirectory(common)
 add_subdirectory(lang)
 add_subdirectory(asm)
 add_subdirectory(rt)

common/CMakeLists.txt

@@ -0,0 +1,4 @@
+file(GLOB_RECURSE common_sources *.c *.h include/ivy/*.h)
+
+add_library(ivy-common SHARED ${common_sources})
+target_include_directories(ivy-common PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include/)

common/include/ivy/line-source.h

@@ -0,0 +1,22 @@
+#ifndef IVY_COMMON_LINE_SOURCE_H_
+#define IVY_COMMON_LINE_SOURCE_H_
+
+#include <stddef.h>
+
+enum ivy_line_source_status {
+	IVY_LS_OK = 0,
+	IVY_LS_EOF,
+	IVY_LS_ERR_IOERR,
+	IVY_LS_ERR_NOSYS,
+};
+
+struct ivy_line_source {
+	enum ivy_line_source_status (*s_readline)(
+		struct ivy_line_source *, char *, size_t, size_t *, const char *);
+};
+
+extern enum ivy_line_source_status ivy_line_source_readline(
+	struct ivy_line_source *src, char *buf, size_t count, size_t *nr_read,
+	const char *prompt);
+
+#endif

common/line-source.c

@@ -0,0 +1,12 @@
+#include <ivy/line-source.h>
+
+enum ivy_line_source_status ivy_line_source_readline(
+	struct ivy_line_source *src, char *buf, size_t count, size_t *nr_read,
+	const char *prompt)
+{
+	if (src->s_readline) {
+		return src->s_readline(src, buf, count, nr_read, prompt);
+	}
+
+	return IVY_LS_ERR_NOSYS;
+}