New module 'memxfrm'.

1 files changed, 46 insertions, 0 deletions

diff --git a/lib/memxfrm.h b/lib/memxfrm.h
new file mode 100644
index 0000000000..6354633186
--- /dev/null
+++ b/lib/memxfrm.h
@@ -0,0 +1,46 @@
+/* Locale dependent memory area transformation for comparison.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef MEMXFRM_H
+#define MEMXFRM_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Generalization of strxfrm() to strings with embedded NUL bytes.  */
+
+/* Transform the memory area [S..S+N-1] to a memory area, in such a way that
+   comparing (S1,N1) and (S2,N2) with memcoll() is equivalent to comparing
+   memxfrm(S1,N1) and memxfrm(S2,N2) with memcmp2().
+   The byte S[N] may be temporarily overwritten by this function, but will be
+   restored before this function returns.
+   The result of this function depends on the LC_COLLATE category of the
+   current locale.
+   If successful, return the freshly allocated transformed string and set
+   *LENGTHP to its length,
+   Upon failure, return NULL, with errno set.  */
+extern char * memxfrm (char *s, size_t n, size_t *lengthp);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MEMXFRM_H */