1*2633Sahlstrchr("fooeyfooeyfoo", 'f') = "fooeyfooeyfoo"
2*2633Sahlstrrchr("fooeyfooeyfoo", 'f') = "foo"
3*2633Sahlstrchr("fooeyfooeyfoo", 'y') = "yfooeyfoo"
4*2633Sahlstrrchr("fooeyfooeyfoo", 'y') = "yfoo"
5*2633Sahlstrrchr("yfooeyfoo", 'y') = "yfoo"
6*2633Sahl
7