1 files changed, 33 insertions, 0 deletions
diff --git a/src/port/strnlen.c b/src/port/strnlen.c
new file mode 100644
index 0000000..27dec18
--- /dev/null
+++ b/src/port/strnlen.c
@@ -0,0 +1,33 @@
+/*-------------------------------------------------------------------------
+ *
+ * strnlen.c
+ *		Fallback implementation of strnlen().
+ *
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/port/strnlen.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "c.h"
+
+/*
+ * Implementation of posix' strnlen for systems where it's not available.
+ *
+ * Returns the number of characters before a null-byte in the string pointed
+ * to by str, unless there's no null-byte before maxlen. In the latter case
+ * maxlen is returned.
+ */
+size_t
+strnlen(const char *str, size_t maxlen)
+{
+	const char *p = str;
+
+	while (maxlen-- > 0 && *p)
+		p++;
+	return p - str;
+}