dev(sell): add simple libc and implement shell

please see the log for detail.

1 files changed, 52 insertions, 0 deletions

diff --git a/include/ulib/cstdlib b/include/ulib/cstdlib
new file mode 100644
index 0000000..69b9bb6
--- /dev/null
+++ b/include/ulib/cstdlib
@@ -0,0 +1,52 @@
+#ifndef _CPP_CSTDLIB
+#define _CPP_CSTDLIB
+
+#include "stdlib.h"
+
+namespace std
+{
+    using :: malloc;
+    using :: free;
+    using :: calloc;
+    using :: realloc;
+
+    using :: exit;
+    using :: abort;
+    using :: atexit;
+    using :: getenv;
+    using :: system;
+
+    using :: atoi;
+    using :: atol;
+    using :: atoll;
+    using :: atof;
+
+    using :: strtol;
+    using :: strtoul;
+    using :: strtoll;
+    using :: strtoull;
+
+    using :: strtod;
+    using :: strtof;
+
+    using :: bsearch;
+    using :: qsort;
+
+    using :: abs;
+    using :: labs;
+    using :: llabs;
+    using :: div;
+    using :: ldiv;
+    using :: lldiv;
+
+    using :: rand;
+    using :: srand;
+
+    using :: mblen;
+    using :: mbtowc;
+    using :: wctomb;
+    using :: mbstowcs;
+    using :: wcstombs;
+}
+
+#endif
\ No newline at end of file