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       af_histories, af_access - AtFS history functions


       #include <atfs.h>

       char**af_histories (char *path, char *pattern)

       char**af_cachenames (char *path, char *pattern);

       int   af_access (char *path, char *name, char *type, int mode)


       af_histories  returns a list of source history names from the directory
       pointed to by path, that  match  the  given  pattern.  Histories  in  a
       directory  are represented by at least one version. The pattern must be
       ed(1) patterns, processable by re_comp(3) and re_exec(3). The resulting
       list  of  af_histories resides in allocated memory. Use free(3) to free
       the memory for further allocation. af_histories returns an  empty  list
       (not a NULL pointer !), when no histories are found.

       af_cachenames  does  the  same  as  af_histories  but on derived object

       af_access determines the existence of an object history.   If  any  ASO
       (any  version)  with  the  given path, name and type attributes exists,
       af_access returns zero, otherwise -1.  The mode argument can either be

                 indicating that only source objects shall be searched or

                 which means that only  the  derived  object  cache  shall  be
                 searched for existence of a matching ASO.


       ed(1), re_comp(3), re_exec(3), free(3)


       Upon  error,  -1  or  a  null pointer (depending on the return type) is
       returned and af_errno is set to the corresponding error number.