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RPMATCH(3) | Linux Programmer's Manual | RPMATCH(3) |
NAME¶
rpmatch - determine if the answer to a question is affirmative or negativeSYNOPSIS¶
#include <stdlib.h> int rpmatch(const char *response);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTION¶
rpmatch() handles a user response to yes or no questions, with support for internationalization.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.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)$.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\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)COLOPHON¶
This page is part of release 3.44 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/.2007-07-26 | GNU |