diff -r 27e5e30d3c30 sys/include/ape/string.h
--- a/sys/include/ape/string.h	Wed Nov 18 20:14:26 2020 +0100
+++ b/sys/include/ape/string.h	Fri Nov 20 09:19:00 2020 +0300
@@ -19,6 +19,7 @@
 extern int strcmp(const char *, const char *);
 extern int strcoll(const char *, const char *);
 extern char *strdup(char*);
+extern char *strndup(char*, size_t);
 extern int strncmp(const char *, const char *, size_t);
 extern size_t strxfrm(char *, const char *, size_t);
 extern void *memchr(const void *, int, size_t);
diff -r 27e5e30d3c30 sys/src/ape/lib/ap/gen/mkfile
--- a/sys/src/ape/lib/ap/gen/mkfile	Wed Nov 18 20:14:26 2020 +0100
+++ b/sys/src/ape/lib/ap/gen/mkfile	Fri Nov 20 09:19:00 2020 +0300
@@ -44,6 +44,7 @@
 	strncat.$O\
 	strncmp.$O\
 	strncpy.$O\
+	strndup.$O\
 	strnlen.$O\
 	strpbrk.$O\
 	strrchr.$O\
diff -r 27e5e30d3c30 sys/src/ape/lib/ap/gen/strndup.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/src/ape/lib/ap/gen/strndup.c	Fri Nov 20 09:19:00 2020 +0300
@@ -0,0 +1,14 @@
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+char*
+strndup(char *p, size_t len)
+{
+	char *np;
+
+	np = malloc(len+1);
+	if(np)
+		memmove(np, p, len+1);
+	return np;
+}