wm: teppich

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add strdup.

--- a/Makefile

+++ b/Makefile

@@ -35,6 +35,7 @@

 	libc/strtol.o\

 	libc/strncpy.o\

 	libc/strncat.o\

+	libc/strdup.o\

 	libc/memcpy.o\

 	libc/memset.o\

 	libc/lladd.o\

--- a/include/libc.h

+++ b/include/libc.h

@@ -12,6 +12,7 @@

 long strtol(char *nptr, char **endptr, int base);

 char* strncpy(char *dst, const char *src, size_t num);

 char* strncat(char *s1, char *s2, long n);

+char* strdup(char *s);

 void* memset(void* src, char c, unsigned int len);

 void* memcpy(void *a1, void *a2, unsigned int len);

--- /dev/null

+++ b/libc/strdup.c

@@ -1,0 +1,12 @@

+#include <u.h>

+#include <libc.h>

+#include <mem.h>

+

+char*

+strdup(char *s)

+{

+	char *dup;

+

+	dup = malloc(strlen(s) + 1); /* s + \0 */

+	return strncpy(s, dup, strlen(s));

+}