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    Subject[RFC PATCH 3/7] kernel.h: implement fmtmatch() wrapper around fmtcheck()
    Date
    Some users may prefer to check a "user-supplied" string upfront and
    return EINVAL rather than using the the template as a fallback for
    printf'ing later. fmtmatch() is simply a shorthand for

    fmtcheck(a, b, c | FMTCHECK_SILENT) == a.

    Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
    ---
    include/linux/kernel.h | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/include/linux/kernel.h b/include/linux/kernel.h
    index 8e9154e100c3..c2b710426227 100644
    --- a/include/linux/kernel.h
    +++ b/include/linux/kernel.h
    @@ -507,11 +507,18 @@ _fmtcheck(const char *fmt, const char *tmpl, unsigned flags)
    return fmt;
    }
    #endif
    +
    +static inline bool
    +_fmtmatch(const char *fmt, const char *tmpl, unsigned flags)
    +{
    + return _fmtcheck(fmt, tmpl, flags | FMTCHECK_SILENT) == fmt;
    +}
    /*
    * Use of fmtcheck is pointless if the template is not a string
    * literal, so try to enforce that.
    */
    #define fmtcheck(fmt, tmpl, flags) _fmtcheck(fmt, "" tmpl "", flags)
    +#define fmtmatch(fmt, tmpl, flags) _fmtmatch(fmt, "" tmpl "", flags)

    extern __scanf(2, 3)
    int sscanf(const char *, const char *, ...);
    --
    2.19.1.6.gbde171bbf5
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