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-rw-r--r--src/string/strndup.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/string/strndup.c b/src/string/strndup.c
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+++ b/src/string/strndup.c
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+/**
+ * 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));
+}
+