ref: d5f2d2cc3fc7c2d3701e906df5d2d53781c4ee9c 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; }