rpmatch man page on Archlinux

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RPMATCH(3)		   Linux Programmer's Manual		    RPMATCH(3)

       rpmatch - determine if the answer to a question is affirmative or nega‐

       #include <stdlib.h>

       int rpmatch(const char *response);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       rpmatch(): _SVID_SOURCE

       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‐

       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.

       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

       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).

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

       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

       The following program displays the results when rpmatch() is applied to
       the string given in the program's command-line argument.

       #define _SVID_SOURCE
       #include <locale.h>
       #include <stdlib.h>
       #include <string.h>
       #include <stdio.h>

       main(int argc, char *argv[])
	   if (argc != 2 || strcmp(argv[1], "--help") == 0) {
	       fprintf(stderr, "%s response\n", argv[0]);

	   setlocale(LC_ALL, "");
	   printf("rpmatch() returns: %d\n", rpmatch(argv[1]));

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

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2007-07-26			    RPMATCH(3)

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