- char *p = strchr(s, c);
- return p ? p : (char *)s + strlen(s);
+ c = (unsigned char)c;
+ if (!c) return (char *)s + strlen(s);
+
+#ifdef __GNUC__
+ typedef size_t __attribute__((__may_alias__)) word;
+ const word *w;
+ for (; (uintptr_t)s % ALIGN; s++)
+ if (!*s || *(unsigned char *)s == c) return (char *)s;
+ size_t k = ONES * c;
+ for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++);
+ s = (void *)w;
+#endif
+ for (; *s && *(unsigned char *)s != c; s++);
+ return (char *)s;