Add BSD compatible strlcpy function (uc_strlcpy)

include/ucore/string.h

@@ -101,6 +101,18 @@ char * uc_human_bytesz_dec(uint64_t bytes, char *result, size_t result_len);
 //(base 2 ,1 KiB == 1024 bytes)
 char * uc_human_bytesz_bin(uint64_t bytes, char *result, size_t result_len);
 
+/** Copy a C string ensuring dst is nul terminated.
+ *  If @max is 0, no action is done
+ *  src must be a nul terminated string
+ *
+ * @param dst destination buffer
+ * @param src source string
+ * @maram max max chars (including nul terminator to copy). This should
+ *            is normally the size of the dst buffer)
+ * return strlen(src) which may be larger than the no. of bytes copied.
+ */
+size_t uc_strlcpy(char *dst, const char *src, size_t max);
+
 #ifdef __cplusplus
 }
 #endif

src/strlcpy.c

@@ -0,0 +1,17 @@
+#include <string.h>
+
+size_t uc_strlcpy(char *dst, const char *src, size_t max)
+{
+    size_t len = strlen(src);
+
+    if (max != 0) {
+        if (len >= max) {
+            memcpy(dst, src, max - 1);
+            dst[max - 1] = 0;
+        } else {
+            memcpy(dst, src, len + 1);
+        }
+    }
+
+    return len;
+}