b4_6_8.cxx

b4_6_8.cxx

// This version of the program does not assume sizeof(int) == sizeof(char*)!

#include ‹stream.hxx›

#include ‹stdarg.hxx›

extern void exit(int);

void error (int …);

main(int argc, char* argv[])

{

 switch (argc) {

 case 1:

  error(0,argv[0],(char*)0);

  break;

 case 2:

  error(0,argv[0],argv[1],(char*)0);

  break;

 default:

  error(1,"with",dec(argc-1),"arguments",(char*)0);

 }

}

void error(int n …)

{

 va_list ap;

 va_start(ap,n);

 for (;;) {

  char *p = va_arg(ap,char*);

  if (p == 0) break;

  cerr ‹‹ p ‹‹ " ";

 }

 va_end(ap);

 cerr ‹‹ " ";

 if (n) exit(n);

}