4 files changed, 30 insertions, 1 deletions
diff --git a/main.c b/main.c
index 3d06c02..4b2143d 100644
--- a/main.c
+++ b/main.c
@@ -3,6 +3,7 @@
 #include "std.h"
 #include "common.c"
 #include "io.c"
+#include "sys.c"
 #include "preprocess.c"
 #include "tokenize.c"
 #include "ast.c"
diff --git a/preprocess.c b/preprocess.c
index 8607fdf..6547028 100644
--- a/preprocess.c
+++ b/preprocess.c
@@ -796,9 +796,16 @@ void pp_dump(PpToken* t, int include_whitespace) {
     }
 }
 
+char* get_ducc_include_path() {
+    const char* self_dir = get_self_dir();
+    char* buf = calloc(strlen(self_dir) + strlen("/include") + 1, sizeof(char));
+    sprintf(buf, "%s/include", self_dir);
+    return buf;
+}
+
 PpToken* do_preprocess(InFile* src, int depth, PpMacros* pp_macros) {
     Preprocessor* pp = preprocessor_new(src, depth, pp_macros);
-    add_include_path(pp, "/home/ken/src/ducc/include");
+    add_include_path(pp, get_ducc_include_path());
     add_include_path(pp, "/usr/include");
     pp_tokenize_all(pp);
     process_pp_directives(pp);
diff --git a/std.h b/std.h
index ecffad7..7ba993a 100644
--- a/std.h
+++ b/std.h
@@ -38,3 +38,9 @@ int vfprintf(FILE*, const char*, va_list);
 #define F_OK 0
 #define R_OK 4
 int access(const char*, int);
+
+#define PATH_MAX 4096
+
+typedef long ssize_t;
+ssize_t readlink(const char*, char*, size_t);
+char* dirname(char*);
diff --git a/sys.c b/sys.c
new file mode 100644
index 0000000..aa7b13d
--- /dev/null
+++ b/sys.c
@@ -0,0 +1,15 @@
+char* get_self_path() {
+    char* buf = calloc(PATH_MAX, sizeof(char));
+    ssize_t len = readlink("/proc/self/exe", buf, PATH_MAX - 1);
+    if (len == -1 || len == PATH_MAX - 1) {
+        return NULL;
+    }
+    buf[len] = '\0';
+    return buf;
+}
+
+// It returns a path not including final / except for root directory.
+char* get_self_dir() {
+    char* path = get_self_path();
+    return dirname(path);
+}