add strdup()

libunix/Makefile

@@ -12,7 +12,7 @@ LIBRARY = libunix.a
 SOURCES = divsi3.S modsi3.S mulsi3.S udivsi3.S umodsi3.S free.c malloc.c \
 	  memcpy.c memset.c printf.c putchar.c puts.c read.c sprintf.c \
 	  strcpy.c strlen.c strncpy.c vsprintf.c write.c strcmp.c \
-	  strncmp.c strtol.c
+	  strncmp.c strtol.c strdup.c
 
 HEADERS = 
 

libunix/strdup.c

@@ -0,0 +1,20 @@
+/*
+ *
+ * (c) 2004,2005 Laurent Vivier <LaurentVivier@wanadoo.fr>
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+char *strdup (__const char *__restrict __src)
+{
+	char *__dest;
+
+	__dest = (char*)malloc(strlen(__src) + 1);
+	if (__dest == NULL)
+		return NULL;
+	strcpy(__dest, __src);
+
+	return __dest;
+}