ref: 7f6aedead42d8d36c26558fdf0c8132b4e2cfe4c 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; }