From 6726ddebccda0eaa6b75d1d14587aecce62ad826 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Mon, 02 Aug 2021 01:31:44 -0400
Subject: util: Add mf_strcat()

---
diff --git a/configure.ac b/configure.ac
index 89ebdbe..a506671 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,7 +38,7 @@ test -d "${srcdir}/.git" || CFLAGS="${save_CFLAGS}"
 funcs_missing=false
 AC_CHECK_FUNCS(
 	[\
-		calloc free rand srand
+		calloc free malloc memcpy rand srand strlen
 	],
 	[],
 	[funcs_missing=true])
diff --git a/src/local.mk b/src/local.mk
index 4414cdc..c72cb44 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -1,4 +1,7 @@
 mazefight_SOURCES += \
 	%reldir%/defs.h \
 	%reldir%/main.c \
-	%reldir%/maze.c
+	%reldir%/maze.c \
+	%reldir%/maze.h \
+	%reldir%/util.c \
+	%reldir%/util.h
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..5e8effc
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Maze Fight
+ *
+ * Maze Fight 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.
+ *
+ * Maze Fight 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 Maze Fight.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "util.h"
+
+char *
+mf_strcat(const char *str1, const char *str2)
+{
+	size_t  str1_len;
+	size_t  str2_len;
+	char   *dest;
+
+	str1_len = strlen(str1);
+	str2_len = strlen(str2);
+
+	dest = malloc((str1_len + str2_len + 1) * sizeof(*dest));
+	if (dest == NULL) {
+		return NULL;
+	}
+
+	memcpy(dest, str1, str1_len);
+	memcpy(dest + str1_len, str2, str2_len);
+	dest[str1_len + str2_len] = '\0';
+
+	return dest;
+}
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..47688e9
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Maze Fight
+ *
+ * Maze Fight 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.
+ *
+ * Maze Fight 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 Maze Fight.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MF_UTIL_H_
+#define MF_UTIL_H_
+
+char *
+mf_strcat(const char *str1, const char *str2);
+
+#endif  /* MF_UTIL_H_ */
--
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