stdio.h defines BUFSIZ

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

/*
* Copyright (c) 1980 The 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 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

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

/*
* unexpand - put tabs into a file replacing blanks
*/
#include <stdio.h>

char    genbuf[BUFSIZ];
char    linebuf[BUFSIZ];
int     all;

main(argc, argv)
       int argc;
       char *argv[];
{
       register char *cp;

       argc--, argv++;
       if (argc > 0 && argv[0][0] == '-') {
               if (strcmp(argv[0], "-a") != 0) {
                       fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
                       exit(1);
               }
               all++;
               argc--, argv++;
       }
       do {
               if (argc > 0) {
                       if (freopen(argv[0], "r", stdin) == NULL) {
                               perror(argv[0]);
                               exit(1);
                       }
                       argc--, argv++;
               }
               while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
                       for (cp = linebuf; *cp; cp++)
                               continue;
                       if (cp > linebuf)
                               cp[-1] = 0;
                       tabify(all);
                       printf("%s", linebuf);
               }
       } while (argc > 0);
       exit(0);
}

tabify(c)
       char c;
{
       register char *cp, *dp;
       register int dcol;
       int ocol;

       ocol = 0;
       dcol = 0;
       cp = genbuf, dp = linebuf;
       for (;;) {
               switch (*cp) {

               case ' ':
                       dcol++;
                       break;

               case '\t':
                       dcol += 8;
                       dcol &= ~07;
                       break;

               default:
                       while (((ocol + 8) &~ 07) <= dcol) {
                               if (ocol + 1 == dcol)
                                       break;
                               *dp++ = '\t';
                               ocol += 8;
                               ocol &= ~07;
                       }
                       while (ocol < dcol) {
                               *dp++ = ' ';
                               ocol++;
                       }
                       if (*cp == 0 || c == 0) {
                               strcpy(dp, cp);
                               return;
                       }
                       *dp++ = *cp;
                       ocol++, dcol++;
               }
               cp++;
       }
}