RPMATCH(3) BSD Library Functions Manual RPMATCH(3)NAME
rpmatch -- determine whether the response to a question is affirmative or negative
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
int
rpmatch(const char *response);
DESCRIPTION
The rpmatch() function determines whether the response argument is an affirmative or negative response to a question according to the current
locale.
RETURN VALUES
The rpmatch() functions returns:
1 The response is affirmative.
0 The response is negative.
-1 The response is not recognized.
SEE ALSO nl_langinfo(3), setlocale(3)HISTORY
The rpmatch() function appeared in FreeBSD 6.0.
BSD July 21, 2005 BSD
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RPMATCH(3) Linux Programmer's Manual RPMATCH(3)NAME
rpmatch - determine if the answer to a question is affirmative or negative
SYNOPSIS
#include <stdlib.h>
int rpmatch(const char *response);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
rpmatch():
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_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 environment 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 neg-
ative.
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
anywhere else, but indicates a failure of the regex engine (but this case is indistinguishable from that of an unrecognized value of
response).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+----------+---------------+----------------+
|Interface | Attribute | Value |
+----------+---------------+----------------+
|rpmatch() | Thread safety | MT-Safe locale |
+----------+---------------+----------------+
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 mil-
lion years" returns 1. It would be preferable to accept input strings much more strictly, for example (using the extended regular expres-
sion notation described in regex(7)): ^([yY]|yes|YES)$ and ^([nN]|no|NO)$.
EXAMPLE
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>
int
main(int argc, char *argv[])
{
if (argc != 2 || strcmp(argv[1], "--help") == 0) {
fprintf(stderr, "%s response
", argv[0]);
exit(EXIT_FAILURE);
}
setlocale(LC_ALL, "");
printf("rpmatch() returns: %d
", rpmatch(argv[1]));
exit(EXIT_SUCCESS);
}
SEE ALSO fgets(3), getline(3), nl_langinfo(3), regcomp(3), setlocale(3)COLOPHON
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latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 RPMATCH(3)