openreadclose - read a whole file into a stralloc

       openreadclose  opens the file filename for reading and reads the whole content into the stralloc sa.  The
       file is read in chunks of bufsize bytes size.  If everything worked fine, openreadclose  returns  1.   If
       the file did not exist, openreadclose returns 0.  On every other error, openreadclose returns -1 and sets
       errno appropriately.

       openreadclose - read a whole file into a stralloc

open_read(3), readclose(3)

                                                                                                openreadclose(3)

#include<libowfat/openreadclose.h>

       ssize_t openreadclose(const char *filename,
                  stralloc* sa,size_t bufsize);