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ape: add strnlen

--- a/sys/include/ape/string.h

+++ b/sys/include/ape/string.h

@@ -32,6 +32,7 @@

 extern void *memset(void *, int, size_t);

 extern char *strerror(int);

 extern size_t strlen(const char *);

+extern size_t strnlen(const char *, size_t);

 #ifdef _REENTRANT_SOURCE

 extern char *strerror_r(int, const char *, int);

--- a/sys/src/ape/lib/ap/gen/mkfile

+++ b/sys/src/ape/lib/ap/gen/mkfile

@@ -43,6 +43,7 @@

 	strncat.$O\

 	strncmp.$O\

 	strncpy.$O\

+	strnlen.$O\

 	strpbrk.$O\

 	strrchr.$O\

 	strspn.$O\

--- a/sys/src/ape/lib/ap/gen/strlen.c

+++ b/sys/src/ape/lib/ap/gen/strlen.c

@@ -3,6 +3,5 @@

 size_t

 strlen(const char *s)

 {

-

 	return strchr(s, 0) - s;

 }

--- /dev/null

+++ b/sys/src/ape/lib/ap/gen/strnlen.c

@@ -1,0 +1,11 @@

+#include <string.h>

+

+size_t

+strnlen(const char *s, size_t maxlen)

+{

+	size_t i;

+

+	for (i = 0; i < maxlen && s[i] != '\0'; i++)

+		;

+	return i;

+}