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instance method

GDBM#key

gdbm.key(value) → key

static VALUE
fgdbm_key(VALUE obj, VALUE valstr)
{
    struct dbmdata *dbmp;
    GDBM_FILE dbm;
    VALUE keystr, valstr2;

    ExportStringValue(valstr);
    GetDBM2(obj, dbmp, dbm);
    for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
         keystr = rb_gdbm_nextkey(dbm, keystr)) {

        valstr2 = rb_gdbm_fetch2(dbm, keystr);
        if (!NIL_P(valstr2) &&
            (int)RSTRING_LEN(valstr) == (int)RSTRING_LEN(valstr2) &&
            memcmp(RSTRING_PTR(valstr), RSTRING_PTR(valstr2),
                   (int)RSTRING_LEN(valstr)) == 0) {
            return keystr;
        }
    }
    return Qnil;
}

Returns the key for a given value. If several keys may map to the same value, the key that is found first will be returned.