ssp: add Object Size Checking for stdlib.h

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

newlib/libc/include/ssp/stdlib.h

@@ -0,0 +1,30 @@
+#ifndef _SSP_STDLIB_H_
+#define _SSP_STDLIB_H_
+
+#include <ssp/ssp.h>
+
+#if __SSP_FORTIFY_LEVEL > 0
+__BEGIN_DECLS
+
+__ssp_decl(size_t, mbstowcs, (wchar_t *__buf, const char *__src, size_t __n))
+{
+  if (__buf != NULL)
+    __ssp_check(__buf, __n * sizeof(wchar_t), __ssp_bos);
+  return __ssp_real_mbstowcs (__buf, __src, __n);
+}
+
+__ssp_redirect_raw(size_t, wcstombs, \
+    (char *__buf, const wchar_t *__src, size_t __len), \
+    (__buf, __src, __len), __buf != NULL, __ssp_bos);
+
+__ssp_decl(int, wctomb, (char *__buf, wchar_t __wc))
+{
+  if (__buf != NULL)
+    __ssp_check(__buf, MB_CUR_MAX, __ssp_bos);
+  return __ssp_real_wctomb (__buf, __wc);
+}
+
+__END_DECLS
+
+#endif /* __SSP_FORTIFY_LEVEL > 0 */
+#endif /* _SSP_STDLIB_H_ */

newlib/libc/include/stdlib.h

@@ -334,4 +334,8 @@ _Noreturn void
 
 _END_STD_C
 
+#if __SSP_FORTIFY_LEVEL > 0
+#include <ssp/stdlib.h>
+#endif
+
 #endif /* _STDLIB_H_ */

newlib/libc/ssp/ssp.tex

@@ -39,6 +39,10 @@ fgets           fread_unlocked  sprintf
 fgets_unlocked  gets            vsnprintf
 fread           snprintf        vsprintf
 
+@exdent @emph{Stdlib functions:}
+mbstowcs        wcstombs        wctomb
+
 @exdent @emph{System functions:}
 getcwd          read            readlink
+
 @end example