stdout was being overwritten in the list of outputs

[unix-history] / usr / src / usr.bin / tee / tee.c

/*
* Copyright (c) 1985 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1985 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint

#ifndef lint
static char *sccsid = "@(#)tee.c        5.2 (Berkeley) %G%";
#endif
/*
* tee-- pipe fitting
*/

#include <stdio.h>
#include <signal.h>

main(argc,argv)
       int argc;
       char *argv[];
{
       register FILE **openf, **lastf, **fdp;
       register i, cc;
       char buf[8192], *calloc();
       int aflag = 0;

       argc--, argv++;
       while (argc > 0 && argv[0][0] == '-') {
               switch (argv[0][1]) {
               case 'a':
                       aflag++;
                       break;
               case 'i':
               case '\0':
                       signal(SIGINT, SIG_IGN);
                       break;
               }
               argv++, argc--;
       }
       lastf = openf = (FILE **)calloc(argc+1, sizeof (FILE *));
       if (openf == 0) {
               fprintf(stderr, "tee: Out of memory.\n");
               exit(-1);
       }
       *lastf++ = stdout;      /* default */
       for (; argc > 0; argc--, argv++) {
               *lastf = fopen(argv[0], aflag ? "a" : "w");
               if (*lastf == NULL)
                       fprintf(stderr, "tee: %s: cannot open.\n", argv[0]);
               else
                       lastf++;
       }
       while ((cc = fread(buf, 1, sizeof (buf), stdin)) > 0)
               for (fdp = openf; fdp < lastf; fdp++)
                       fwrite(buf, 1, cc, *fdp);
       exit(0);
}