split out string/strn/ from string/str/

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/string/strn/strndup.c b/src/string/strn/strndup.c
new file mode 100644
index 0000000..ca3b3f0
--- /dev/null
+++ b/src/string/strn/strndup.c
@@ -0,0 +1,43 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <string.h>
+#include <stdlib.h>
+
+
+
+/**
+ * Duplicate a string.
+ * 
+ * This is a GNU extension.
+ * 
+ * @param   string  The string to duplicate.
+ * @param   maxlen  Truncate the string to this length, if it is longer.
+ *                  A NUL byte is guaranteed to always be written
+ *                  upon successful completion.
+ * @return          The new string. `NULL` is returned on error
+ *                  and `errno` is set to indicate the error.
+ * 
+ * @throws  ENOMEM  The process could not allocate sufficient amount of memory.
+ */
+char* strndup(const char* string, size_t maxlen)
+{
+  size_t n = strnlen(string, maxlen) + 1;
+  char* r = malloc(n * sizeof(char));
+  return r == NULL ? NULL : memcpy(r, string, n * sizeof(char));
+}
+