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