1178476Sjbstrchr("fooeyfooeyfoo", 'f') = "fooeyfooeyfoo"
2178476Sjbstrrchr("fooeyfooeyfoo", 'f') = "foo"
3178476Sjbstrchr("fooeyfooeyfoo", 'y') = "yfooeyfoo"
4178476Sjbstrrchr("fooeyfooeyfoo", 'y') = "yfoo"
5178476Sjbstrrchr("yfooeyfoo", 'y') = "yfoo"
6178476Sjb
7