string: remove unused strndup implementation

configure.ac

@@ -49,9 +49,6 @@ AC_DEFINE([_XOPEN_SOURCE], [700], [use POSIX 2008])
 
 AC_FUNC_MMAP
 
-AC_CHECK_FUNC([strndup], [
-    AC_DEFINE([HAVE_STRNDUP], [], [strndup appears to be present])
-])
 
 AC_CHECK_HEADER([execinfo.h], [break])
 AM_CONDITIONAL([HAVE_EXECINFO], [test x$ac_cv_header_execinfo_h = "xyes"])

string.cpp

@@ -14,12 +14,12 @@
  * Copyright 2011 Danny Robson <danny@nerdcruft.net>
  */
 
-#include "string.hpp"
+#include "./string.hpp"
+
+#include "./cast.hpp"
 
 #include <cstring>
 
-#include "cast.hpp"
-
 // TODO: Horribly inefficient, but God help you if you're relying on this
 // being efficient in the first place.
 bool
@@ -27,30 +27,3 @@ strbegins (const char *restrict str,
            const char *restrict prefix) {
     return 0 == strncmp (prefix, str, strlen (prefix));
 }
-
-
-
-#if !defined(HAVE_STRNDUP)
-#include <cstdlib>
-
-// Written by Niels Möller <nisse@lysator.liu.se>
-// Placed in the public domain
-
-char *
-strndup (const char *restrict s, size_t size)
-{
-    char *end = static_cast<char *> (memchr (s, 0, size));
-
-    if (end)
-        // Length + 1
-        size = sign_cast<size_t> (end - s) + 1u;
-
-    char * r = static_cast<char *> (malloc (size));
-
-    if (size) {
-        memcpy (r, s, size-1);
-        r[size-1] = '\0';
-    }
-    return r;
-}
-#endif

string.hpp

@@ -21,15 +21,5 @@ bool
 strbegins(const char *restrict str,
           const char *restrict prefix);
 
-
-#if !defined(HAVE_STRNDUP)
-#include <cstddef>
-
-extern "C" {
-    char *
-    strndup (const char *restrict s, size_t size);
-}
-#endif
-
 #endif // __UTIL_STRING_HPP