util: implement strndup for WIN32

v2:
- Add strndup.h to Makefile.sources (Emil)
- Use calloc instead of malloc (Emil).
- Check if allocation fails (Emil, Jose)
- Add '#pragma once' and include stdlib.h to strndup.h (Jose)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92124
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/util/strndup.c b/src/util/strndup.c
new file mode 100644
index 0000000..2c24d37
--- /dev/null
+++ b/src/util/strndup.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#if defined(_WIN32)
+#include <stdlib.h>
+#include "strndup.h"
+
+char *
+strndup(const char *str, size_t max)
+{
+   size_t n;
+   char *ptr;
+
+   if (!str)
+      return NULL;
+
+   n = strlen(str);
+   if (n > max)
+      n = max;
+
+   ptr = (char *) calloc(n + 1, sizeof(char));
+   if (!ptr)
+      return NULL;
+
+   memcpy(ptr, str, n);
+   return ptr;
+}
+
+#endif