1 files changed, 62 insertions, 0 deletions
diff --git a/mysys/mf_arr_appstr.c b/mysys/mf_arr_appstr.c
new file mode 100644
index 00000000..7c105bcf
--- /dev/null
+++ b/mysys/mf_arr_appstr.c
@@ -0,0 +1,62 @@
+/* Copyright (C) 2007 MySQL AB
+   Use is subject to license terms
+
+   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; version 2 of the License.
+
+   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, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA */
+
+#include "mysys_priv.h"
+#include <m_string.h>                           /* strcmp() */
+
+
+/**
+  Append str to array, or move to the end if it already exists
+
+  @param str    String to be appended
+  @param array  The array, terminated by a NULL element, all unused elements
+                pre-initialized to NULL
+  @param size   Size of the array; array must be terminated by a NULL
+                pointer, so can hold size - 1 elements
+
+  @retval FALSE  Success
+  @retval TRUE   Failure, array is full
+*/
+
+my_bool array_append_string_unique(const char *str,
+                                   const char **array, size_t size)
+{
+  const char **p;
+  /* end points at the terminating NULL element */
+  const char **end= array + size - 1;
+  DBUG_ASSERT(*end == NULL);
+
+  for (p= array; *p; ++p)
+  {
+    if (strcmp(*p, str) == 0)
+      break;
+  }
+  if (p >= end)
+    return TRUE;                               /* Array is full */
+
+  DBUG_ASSERT(*p == NULL || strcmp(*p, str) == 0);
+
+  while (*(p + 1))
+  {
+    *p= *(p + 1);
+    ++p;
+  }
+
+  DBUG_ASSERT(p < end);
+  *p= str;
+
+  return FALSE;                                 /* Success */
+}