zircon/third_party/ulib/musl/src/string/strncat.c

#include <string.h>

char* strncat(char* restrict d, const char* restrict s, size_t n) {
  char* a = d;
  d += strlen(d);
  while (n && *s)
    n--, *d++ = *s++;
  *d++ = 0;
  return a;
}