Add alphasort(3).

libc/Makefile

@@ -29,6 +29,7 @@ calloc.o \
 clearerr.o \
 c++.o \
 ctype.o \
+dirent/alphasort.o \
 dirent/dir.o \
 div.o \
 errno.o \

libc/dirent/alphasort.cpp

@@ -0,0 +1,31 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library 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.
+
+    The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    dirent/alphasort.cpp
+    Compare directory entries alphabetically.
+
+*******************************************************************************/
+
+#include <dirent.h>
+#include <string.h>
+
+extern "C" int alphasort(const struct dirent** a, const struct dirent** b)
+{
+	return strcoll((*a)->d_name, (*b)->d_name);
+}

libc/include/dirent.h

@@ -40,6 +40,7 @@ struct dirent
 	char d_name[0];
 };
 
+int alphasort(const struct dirent**, const struct dirent**);
 int closedir(DIR* dir);
 int dirfd(DIR* dir);
 DIR* fdopendir(int fd);