C/Strncatf

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This is a variation of strcat() with a few important differences / improvements:

  • allows you to pass a formatted string like printf()
  • takes a max length for dest, not for how much of src to use (like strncat())
  • returns a pointer to the \0 at the end of dest after the operation.
char *strncatf(char *dest, int length, char *format, ...) {
  char buf[4096];
  va_list ap;
  va_start(ap,format);
  vsnprintf(buf,sizeof(buf),format,ap);
  va_end(ap);
  length -= strlen(dest);
  strncat(dest,buf,length-1);
  return &dest[strlen(dest)];
}
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