install approved copyright notice

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

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)fold.c      5.2 (Berkeley) %G%";
#endif /* not lint */

#include <stdio.h>
/*
* fold - fold long lines for finite output devices
*
* Bill Joy UCB June 28, 1977
*/

int     fold =  80;

main(argc, argv)
       int argc;
       char *argv[];
{
       register c;
       FILE *f;

       argc--, argv++;
       if (argc > 0 && argv[0][0] == '-') {
               fold = 0;
               argv[0]++;
               while (*argv[0] >= '0' && *argv[0] <= '9')
                       fold *= 10, fold += *argv[0]++ - '0';
               if (*argv[0]) {
                       printf("Bad number for fold\n");
                       exit(1);
               }
               argc--, argv++;
       }
       do {
               if (argc > 0) {
                       if (freopen(argv[0], "r", stdin) == NULL) {
                               perror(argv[0]);
                               exit(1);
                       }
                       argc--, argv++;
               }
               for (;;) {
                       c = getc(stdin);
                       if (c == -1)
                               break;
                       putch(c);
               }
       } while (argc > 0);
       exit(0);
}

int     col;

putch(c)
       register c;
{
       register ncol;

       switch (c) {
               case '\n':
                       ncol = 0;
                       break;
               case '\t':
                       ncol = (col + 8) &~ 7;
                       break;
               case '\b':
                       ncol = col ? col - 1 : 0;
                       break;
               case '\r':
                       ncol = 0;
                       break;
               default:
                       ncol = col + 1;
       }
       if (ncol > fold)
               putchar('\n'), col = 0;
       putchar(c);
       switch (c) {
               case '\n':
                       col = 0;
                       break;
               case '\t':
                       col += 8;
                       col &= ~7;
                       break;
               case '\b':
                       if (col)
                               col--;
                       break;
               case '\r':
                       col = 0;
                       break;
               default:
                       col++;
                       break;
       }
}