ref: 0bb90c3d2f157d6eef3a42061874b696f7a14d7c
dir: /sys/src/ape/lib/ap/gen/strncat.c/
#include <string.h> char* strncat(char *s1, const char *s2, size_t n) { char *os1; long nn; os1 = s1; nn = n; while(*s1++) ; s1--; while(*s1++ = *s2++) if(--nn < 0) { s1[-1] = 0; break; } return os1; }