libc: Add libgen.h

libc/include/libgen.h

@@ -0,0 +1,23 @@
+/* libgen.h: Path parsing functions. */
+
+#ifndef _LIBGEN_H
+#define _LIBGEN_H
+
+// These functions are implemented in libluna (CPath.h)
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Returns path's base name. Will modify path. */
+    char* basename(char* path);
+
+    /* Returns path's parent directory. Will modify path. */
+    char* dirname(char* path);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libluna/include/luna/CPath.h

@@ -1,4 +1,7 @@
 #pragma once
 
-char* basename(char*);
-char* dirname(char*);
+extern "C"
+{
+    char* basename(char*);
+    char* dirname(char*);
+}

libluna/src/CPath.cpp

@@ -3,8 +3,10 @@
 
 static char dot[] = ".";
 
-char* basename(char* path)
+extern "C"
 {
+    char* basename(char* path)
+    {
         // If path is NULL, or the string's length is 0, return .
         if (!path) return dot;
         usize len = strlen(path);
@@ -21,10 +23,10 @@ char* basename(char* path)
         char* beg = strrchr(path, '/');
         if (!beg) return path;
         return beg + 1;
-}
+    }
 
-char* dirname(char* path)
-{
+    char* dirname(char* path)
+    {
         // If path is NULL, or the string's length is 0, return .
         if (!path) return dot;
         usize len = strlen(path);
@@ -44,4 +46,5 @@ char* dirname(char* path)
         else
             *(end + 1) = 0;
         return path;
+    }
 }