// This code is Public Domain. Use, modify, and redistribute at will.
// ----------------------------------------------------------------------------
-char * strncat( char * restrict s1, const char * restrict s2, size_t n ) { /* TODO */ };
+#include <__size_t.h>
+
+char * strncat( char * restrict dest, const char * restrict src, size_t n )
+{
+ char * tmp = dest;
+ while ( *dest != '\0' )
+ {
+ ++dest;
+ }
+ while ( ( n-- > 0 ) && ( *src != '\0' ) )
+ {
+ *dest++ = *src++;
+ }
+ return tmp;
+}