ref: a7f1bb9a9e1720b22d1fbed16e7527fa2cd0d82c 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; }