ref: f777743b7242e539a8ac806e4e15c4b527be4bb6
dir: /sys/src/libc/port/strncat.c/
#include <u.h> #include <libc.h> char* strncat(char *s1, char *s2, long n) { char *os1; os1 = s1; while(*s1++) ; s1--; while(*s1++ = *s2++) if(--n < 0) { s1[-1] = 0; break; } return os1; }