fcoemon: Add string array support

Add generalized string array support for new code.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>

include/strarr.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _STRARR_H_
+#define _STRARR_H_
+
+typedef const char * const _strarr[];
+
+struct _str_arr_desc {
+	const unsigned limit;
+	const _strarr * const str_arr;
+	const char * const unknown_str;
+	const char * const out_of_range_str;
+};
+
+#define GEN_STR_ARR(sc, sz, nm, unk, oor, ...)			\
+static const char * const _##nm##_strs[sz] = { __VA_ARGS__ };	\
+sc const struct _str_arr_desc nm = {				\
+	.limit = sizeof(_##nm##_strs) / sizeof(_##nm##_strs[0]),\
+	.str_arr = &_##nm##_strs,				\
+	.unknown_str = unk,					\
+	.out_of_range_str = oor,				\
+}
+
+#define EXT_STR_ARR(nm, unk, oor, ...)		\
+		GEN_STR_ARR(, , nm, unk, oor, __VA_ARGS__)
+#define EXT_STR_ARR_SZ(nm, sz, unk, oor, ...)	\
+		GEN_STR_ARR(, sz, nm, unk, oor, __VA_ARGS__)
+#define STR_ARR(nm, unk, oor, ...)		\
+		GEN_STR_ARR(static, , nm, unk, oor, __VA_ARGS__)
+#define STR_ARR_SZ(nm, sz, unk, oor, ...)	\
+		GEN_STR_ARR(static, sz, nm, unk, oor, __VA_ARGS__)
+
+static inline const char *
+getstr(const struct _str_arr_desc *desc, unsigned ix)
+{
+	const char *str;
+
+	if (ix >= desc->limit)
+		return desc->out_of_range_str;
+	str = (*desc->str_arr)[ix];
+	if (!str)
+		return desc->unknown_str;
+
+	return str;
+}
+
+#endif /* _STRARR_H_ */