evil: add strndup().

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

src/lib/evil/evil_string.c

@@ -11,6 +11,21 @@
  *
  */
 
+char *
+strndup(const char *str, size_t n)
+{
+   size_t slen = strlen(str);
+   char *ret;
+
+   if (slen > n) slen = n;
+   ret = malloc (slen + 1);
+   if (!ret) return NULL;
+
+   if (slen > 0) memcpy(ret, str, slen);
+   ret[slen] = '\0';
+   return ret;
+}
+
 int ffs(int i)
 {
    int size;

src/lib/evil/evil_string.h

@@ -18,6 +18,22 @@
  * bit related functions
  *
  */
+/**
+ * @brief Duplicate a string
+ *
+ * @param str String to be duplicated
+ * @param n size of new duplicated string
+ * @return The strndup() function returns a pointer to the duplicated string, or NULL if insufficient memory was available.
+ *
+ * This function returns a pointer to a new string which is a duplicate of the string str, 
+ * but only copies at most n bytes. If str is longer than n, only n bytes are copied,
+ * and a terminating null byte ('\0') is added.
+ *
+ * Conformity: BSD
+ *
+ * Supported OS: Windows XP.
+ */
+EAPI char *strndup(const char *str, size_t n);
 
 /**
  * @brief Return the position of the first (least significant) bit set in a word