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    Command:

    rpmatch

    
    
    
    

    SYNOPSIS

           #include <stdlib.h>
    
           int rpmatch(const char *response);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           rpmatch(): _SVID_SOURCE
    
    
    

    DESCRIPTION

           rpmatch() handles a user response to yes or no questions, with  support
           for internationalization.
    
           response  should be a null-terminated string containing a user-supplied
           response, perhaps obtained with fgets(3) or getline(3).
    
           The user's language preference is taken into account per  the  environ-
           ment variables LANG, LC_MESSAGES, and LC_ALL, if the program has called
           setlocale(3) to effect their changes.
    
           Regardless of the locale, responses matching ^[Yy] are always  accepted
           as  affirmative,  and those matching ^[Nn] are always accepted as nega-
           tive.
    
    
    

    RETURN VALUE

           After examining response, rpmatch() returns 0 for a recognized negative
           response  ("no"),  1 for a recognized positive response ("yes"), and -1
           when the value of response is unrecognized.
    
    
    

    ERRORS

           A return value of -1 may indicate either  an  invalid  input,  or  some
           other  error.   It  is  incorrect  to  only test if the return value is
           nonzero.
    
           rpmatch() can fail for any of the reasons that regcomp(3) or regexec(3)
           can  fail;  the  cause of the error is not available from errno or any-
           where else, but indicates a failure of the regex engine (but this  case
           is indistinguishable from that of an unrecognized value of response).
    
    
    

    CONFORMING TO

           rpmatch()  is  not  required by any standard, but is available on a few
           other systems.
    
    
    

    BUGS

           The rpmatch() implementation looks  at  only  the  first  character  of
           response.   As  a  consequence, "nyes" returns 0, and "ynever; not in a
           million years" returns 1.  It  would  be  preferable  to  accept  input
           strings  much  more  strictly,  for example (using the extended regular
           expression  notation  described  in  regex(7)):  ^([yY]|yes|YES)$   and
           ^([nN]|no|NO)$.
    
                   fprintf(stderr, "%s response\n", argv[0]);
                   exit(EXIT_FAILURE);
               }
    
               setlocale(LC_ALL, "");
               printf("rpmatch() returns: %d\n", rpmatch(argv[1]));
               exit(EXIT_SUCCESS);
           }
    
    
    

    SEE ALSO

           fgets(3), getline(3), nl_langinfo(3), regcomp(3), setlocale(3)
    
    
    

    GNU 2007-07-26 RPMATCH(3)

    
    
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