ref: f3f4111f3e9f9fec452c9550c9c2bb5905c2f09d dir: /sys/src/libc/port/strcat.c/
#include <u.h> #include <libc.h> char* strcat(char *s1, char *s2) { strcpy(strchr(s1, 0), s2); return s1; }