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unexpand.c revision 1.2
      1  1.1      cgd /*-
      2  1.1      cgd  * Copyright (c) 1980 The Regents of the University of California.
      3  1.1      cgd  * All rights reserved.
      4  1.1      cgd  *
      5  1.1      cgd  * Redistribution and use in source and binary forms, with or without
      6  1.1      cgd  * modification, are permitted provided that the following conditions
      7  1.1      cgd  * are met:
      8  1.1      cgd  * 1. Redistributions of source code must retain the above copyright
      9  1.1      cgd  *    notice, this list of conditions and the following disclaimer.
     10  1.1      cgd  * 2. Redistributions in binary form must reproduce the above copyright
     11  1.1      cgd  *    notice, this list of conditions and the following disclaimer in the
     12  1.1      cgd  *    documentation and/or other materials provided with the distribution.
     13  1.1      cgd  * 3. All advertising materials mentioning features or use of this software
     14  1.1      cgd  *    must display the following acknowledgement:
     15  1.1      cgd  *	This product includes software developed by the University of
     16  1.1      cgd  *	California, Berkeley and its contributors.
     17  1.1      cgd  * 4. Neither the name of the University nor the names of its contributors
     18  1.1      cgd  *    may be used to endorse or promote products derived from this software
     19  1.1      cgd  *    without specific prior written permission.
     20  1.1      cgd  *
     21  1.1      cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  1.1      cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  1.1      cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  1.1      cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  1.1      cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  1.1      cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  1.1      cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  1.1      cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  1.1      cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  1.1      cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  1.1      cgd  * SUCH DAMAGE.
     32  1.1      cgd  */
     33  1.1      cgd 
     34  1.1      cgd #ifndef lint
     35  1.1      cgd char copyright[] =
     36  1.1      cgd "@(#) Copyright (c) 1980 The Regents of the University of California.\n\
     37  1.1      cgd  All rights reserved.\n";
     38  1.1      cgd #endif /* not lint */
     39  1.1      cgd 
     40  1.1      cgd #ifndef lint
     41  1.2  mycroft /*static char sccsid[] = "from: @(#)unexpand.c	5.3 (Berkeley) 4/18/91";*/
     42  1.2  mycroft static char rcsid[] = "$Id: unexpand.c,v 1.2 1993/08/01 18:04:04 mycroft Exp $";
     43  1.1      cgd #endif /* not lint */
     44  1.1      cgd 
     45  1.1      cgd /*
     46  1.1      cgd  * unexpand - put tabs into a file replacing blanks
     47  1.1      cgd  */
     48  1.1      cgd #include <stdio.h>
     49  1.1      cgd 
     50  1.1      cgd char	genbuf[BUFSIZ];
     51  1.1      cgd char	linebuf[BUFSIZ];
     52  1.1      cgd int	all;
     53  1.1      cgd 
     54  1.1      cgd main(argc, argv)
     55  1.1      cgd 	int argc;
     56  1.1      cgd 	char *argv[];
     57  1.1      cgd {
     58  1.1      cgd 	register char *cp;
     59  1.1      cgd 
     60  1.1      cgd 	argc--, argv++;
     61  1.1      cgd 	if (argc > 0 && argv[0][0] == '-') {
     62  1.1      cgd 		if (strcmp(argv[0], "-a") != 0) {
     63  1.1      cgd 			fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
     64  1.1      cgd 			exit(1);
     65  1.1      cgd 		}
     66  1.1      cgd 		all++;
     67  1.1      cgd 		argc--, argv++;
     68  1.1      cgd 	}
     69  1.1      cgd 	do {
     70  1.1      cgd 		if (argc > 0) {
     71  1.1      cgd 			if (freopen(argv[0], "r", stdin) == NULL) {
     72  1.1      cgd 				perror(argv[0]);
     73  1.1      cgd 				exit(1);
     74  1.1      cgd 			}
     75  1.1      cgd 			argc--, argv++;
     76  1.1      cgd 		}
     77  1.1      cgd 		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
     78  1.1      cgd 			for (cp = linebuf; *cp; cp++)
     79  1.1      cgd 				continue;
     80  1.1      cgd 			if (cp > linebuf)
     81  1.1      cgd 				cp[-1] = 0;
     82  1.1      cgd 			tabify(all);
     83  1.1      cgd 			printf("%s", linebuf);
     84  1.1      cgd 		}
     85  1.1      cgd 	} while (argc > 0);
     86  1.1      cgd 	exit(0);
     87  1.1      cgd }
     88  1.1      cgd 
     89  1.1      cgd tabify(c)
     90  1.1      cgd 	char c;
     91  1.1      cgd {
     92  1.1      cgd 	register char *cp, *dp;
     93  1.1      cgd 	register int dcol;
     94  1.1      cgd 	int ocol;
     95  1.1      cgd 
     96  1.1      cgd 	ocol = 0;
     97  1.1      cgd 	dcol = 0;
     98  1.1      cgd 	cp = genbuf, dp = linebuf;
     99  1.1      cgd 	for (;;) {
    100  1.1      cgd 		switch (*cp) {
    101  1.1      cgd 
    102  1.1      cgd 		case ' ':
    103  1.1      cgd 			dcol++;
    104  1.1      cgd 			break;
    105  1.1      cgd 
    106  1.1      cgd 		case '\t':
    107  1.1      cgd 			dcol += 8;
    108  1.1      cgd 			dcol &= ~07;
    109  1.1      cgd 			break;
    110  1.1      cgd 
    111  1.1      cgd 		default:
    112  1.1      cgd 			while (((ocol + 8) &~ 07) <= dcol) {
    113  1.1      cgd 				if (ocol + 1 == dcol)
    114  1.1      cgd 					break;
    115  1.1      cgd 				*dp++ = '\t';
    116  1.1      cgd 				ocol += 8;
    117  1.1      cgd 				ocol &= ~07;
    118  1.1      cgd 			}
    119  1.1      cgd 			while (ocol < dcol) {
    120  1.1      cgd 				*dp++ = ' ';
    121  1.1      cgd 				ocol++;
    122  1.1      cgd 			}
    123  1.1      cgd 			if (*cp == 0 || c == 0) {
    124  1.1      cgd 				strcpy(dp, cp);
    125  1.1      cgd 				return;
    126  1.1      cgd 			}
    127  1.1      cgd 			*dp++ = *cp;
    128  1.1      cgd 			ocol++, dcol++;
    129  1.1      cgd 		}
    130  1.1      cgd 		cp++;
    131  1.1      cgd 	}
    132  1.1      cgd }
    133