add strfry

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/string/strfry.c b/src/string/strfry.c
new file mode 100644
index 0000000..f020202
--- /dev/null
+++ b/src/string/strfry.c
@@ -0,0 +1,46 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <string.h>
+#include <stdlib.h>
+
+
+/* Sattolo Cycles. */
+
+
+
+/**
+ * Shuffles all bytes in a string.
+ * 
+ * This is a GNU joke extension.
+ * 
+ * @param   anagram  An anagram of the output, will be modified.
+ * @retrun           The string, which will `== anagram`.
+ */
+char* strfry(char* anagram)
+{
+  size_t i, j;
+  char t;
+  if (anagram == NULL)
+    return NULL;
+  for (i = strlen(anagram); --i;)
+    {
+      j = (int)((double)rand() / (RAND_MAX + 1));
+      t = anagram[i], anagram[i] = anagram[j], anagram[j] = t;
+    }
+}
+