#include <stdlib.h>

 #include <string.h>

 #include <bl/mem.h>

 #include <bl/strfuncs.h>

 /*

  * Like strndup, but only returns NULL if str is NULL.

  * Note that this routine copies n bytes rather than n characters.

  */

 char *str_ndup(const char *str,size_t n)

 {

     char *dup;

     if (!str)

 	return NULL;

     dup=mem_alloc0(n+1,1);

     strncpy(dup,str,n);

     return dup;

 }

 /*

  * Like strdup, but only returns NULL if str is NULL.

  */

 char *str_dup(const char *str)

 {

     return str_ndup(str,strlen(str));

 }