tag 268121 patch
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Attached is a patch to document rpmatch; please consider including it.
.\" Copyright (C) 2006 Justin Pryzby <[EMAIL PROTECTED]>
.\"
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.\" References:
.\" glibc manual and source
.TH ERROR 3 "2006-05-05" GNU
.SH NAME
rpmatch \- parse the response to a boolean question
.SH SYNOPSIS
\fB#define _SVID_SOURCE
\fB#include <stdlib.h>
\fBint rpmatch (const char *\fIresponse\fB);
.SH DESCRIPTION
\fBrpmatch\fP() handles a user response to yes or no questions, with
support for internationalization. The user's language preferrence is
taken into account per the values of \fBLANG\fP, \fBLC_MESSAGES\fP,
and \fBLC_ALL\fP.
\fIresponse\fP should be a \fBNULL\fP-terminated string containing a
user-supplied response, perhaps obtained with \fBfgets\fP(3) or
\fBgetline\fP(3).
.SH "RETURN VALUE"
\fBrpmatch\fP() returns 0 for a recognized negative response ("no"), 1
for a recognized positive response ("yes"), and \-1 when the contents
of \fIresponse\fP is unrecognized.
.SH 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. \fBrpmatch\fP() can fail for any of the reasons that
\fBregcomp\fP(3) or \fBregexec\fP(3) can fail; the cause of the error
is not available from \fIerrno\fP or anywhere else, but indicates a
failure of the regex engine (but this case is indistinguishable from
that of an unrecognized value of \fIresponse\fP).
.SH "CONFORMING TO"
\fBrpmatch\fP() is not required by any standards document, and should
not be used in programs intended to be portable.
.SH BUGS
The \fBrpmatch\fP() implementation looks at only the first character
of \fIresponse\fP. As a consequence, "nyes" returns 0, and the
following all return 1:
.RS
.sp
\*(lqyno, never; not in a million years\*(rq
.br
.TP
\*(lqyover my dead body\*(rq
.br
.TP
\*(lqywhenever hell freezes over\*(rq
.sp
.RE
It would be preferrable to accept parse input strings much more
strictly, for example: \fBm/^y(es?)$/i\fP and \fBm/^n(o?)$/i\fP.
.SH SEE ALSO
.br
.BR regex (3),
.BR fgets (3),
.BR getline (3)
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