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-rw-r--r--mysys/mf_arr_appstr.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/mysys/mf_arr_appstr.c b/mysys/mf_arr_appstr.c
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+++ b/mysys/mf_arr_appstr.c
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+/* 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 */
+}