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unexpand.c revision 1.3 
      1 /*	$NetBSD: unexpand.c,v 1.3 1994/12/07 00:36:41 jtc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 static char copyright[] =
     38 "@(#) Copyright (c) 1980, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n";
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)unexpand.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 static char rcsid[] = "$NetBSD: unexpand.c,v 1.3 1994/12/07 00:36:41 jtc Exp $";
     47 #endif /* not lint */
     48 
     49 /*
     50  * unexpand - put tabs into a file replacing blanks
     51  */
     52 #include <stdio.h>
     53 
     54 char	genbuf[BUFSIZ];
     55 char	linebuf[BUFSIZ];
     56 int	all;
     57 
     58 main(argc, argv)
     59 	int argc;
     60 	char *argv[];
     61 {
     62 	register char *cp;
     63 
     64 	argc--, argv++;
     65 	if (argc > 0 && argv[0][0] == '-') {
     66 		if (strcmp(argv[0], "-a") != 0) {
     67 			fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
     68 			exit(1);
     69 		}
     70 		all++;
     71 		argc--, argv++;
     72 	}
     73 	do {
     74 		if (argc > 0) {
     75 			if (freopen(argv[0], "r", stdin) == NULL) {
     76 				perror(argv[0]);
     77 				exit(1);
     78 			}
     79 			argc--, argv++;
     80 		}
     81 		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
     82 			for (cp = linebuf; *cp; cp++)
     83 				continue;
     84 			if (cp > linebuf)
     85 				cp[-1] = 0;
     86 			tabify(all);
     87 			printf("%s", linebuf);
     88 		}
     89 	} while (argc > 0);
     90 	exit(0);
     91 }
     92 
     93 tabify(c)
     94 	char c;
     95 {
     96 	register char *cp, *dp;
     97 	register int dcol;
     98 	int ocol;
     99 
    100 	ocol = 0;
    101 	dcol = 0;
    102 	cp = genbuf, dp = linebuf;
    103 	for (;;) {
    104 		switch (*cp) {
    105 
    106 		case ' ':
    107 			dcol++;
    108 			break;
    109 
    110 		case '\t':
    111 			dcol += 8;
    112 			dcol &= ~07;
    113 			break;
    114 
    115 		default:
    116 			while (((ocol + 8) &~ 07) <= dcol) {
    117 				if (ocol + 1 == dcol)
    118 					break;
    119 				*dp++ = '\t';
    120 				ocol += 8;
    121 				ocol &= ~07;
    122 			}
    123 			while (ocol < dcol) {
    124 				*dp++ = ' ';
    125 				ocol++;
    126 			}
    127 			if (*cp == 0 || c == 0) {
    128 				strcpy(dp, cp);
    129 				return;
    130 			}
    131 			*dp++ = *cp;
    132 			ocol++, dcol++;
    133 		}
    134 		cp++;
    135 	}
    136 }
    137