/* * call-seq: * str.reverse! => str * * Reverses <i>str</i> in place. */ static VALUE rb_str_reverse_bang(str) VALUE str; { char *s, *e; char c; if (RSTRING(str)->len > 1) { rb_str_modify(str); s = RSTRING(str)->ptr; e = s + RSTRING(str)->len - 1; while (s < e) { c = *s; *s++ = *e; *e-- = c; } } return str; }