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unexpand.c revision 1.6 
      1 /*	$NetBSD: unexpand.c,v 1.6 1997/10/20 02:20:41 lukem 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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) 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 __RCSID("$NetBSD: unexpand.c,v 1.6 1997/10/20 02:20:41 lukem Exp $");
     47 #endif /* not lint */
     48 
     49 /*
     50  * unexpand - put tabs into a file replacing blanks
     51  */
     52 #include <stdio.h>
     53 #include <string.h>
     54 
     55 char	genbuf[BUFSIZ];
     56 char	linebuf[BUFSIZ];
     57 int	all;
     58 
     59 int	main __P((int, char **));
     60 void tabify __P((char));
     61 
     62 int
     63 main(argc, argv)
     64 	int argc;
     65 	char *argv[];
     66 {
     67 	char *cp;
     68 
     69 	argc--, argv++;
     70 	if (argc > 0 && argv[0][0] == '-') {
     71 		if (strcmp(argv[0], "-a") != 0) {
     72 			fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
     73 			exit(1);
     74 		}
     75 		all++;
     76 		argc--, argv++;
     77 	}
     78 	do {
     79 		if (argc > 0) {
     80 			if (freopen(argv[0], "r", stdin) == NULL) {
     81 				perror(argv[0]);
     82 				exit(1);
     83 			}
     84 			argc--, argv++;
     85 		}
     86 		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
     87 			for (cp = linebuf; *cp; cp++)
     88 				continue;
     89 			if (cp > linebuf)
     90 				cp[-1] = 0;
     91 			tabify(all);
     92 			printf("%s", linebuf);
     93 		}
     94 	} while (argc > 0);
     95 	exit(0);
     96 }
     97 
     98 void
     99 tabify(c)
    100 	char c;
    101 {
    102 	char *cp, *dp;
    103 	int dcol;
    104 	int ocol;
    105 
    106 	ocol = 0;
    107 	dcol = 0;
    108 	cp = genbuf, dp = linebuf;
    109 	for (;;) {
    110 		switch (*cp) {
    111 
    112 		case ' ':
    113 			dcol++;
    114 			break;
    115 
    116 		case '\t':
    117 			dcol += 8;
    118 			dcol &= ~07;
    119 			break;
    120 
    121 		default:
    122 			while (((ocol + 8) &~ 07) <= dcol) {
    123 				if (ocol + 1 == dcol)
    124 					break;
    125 				*dp++ = '\t';
    126 				ocol += 8;
    127 				ocol &= ~07;
    128 			}
    129 			while (ocol < dcol) {
    130 				*dp++ = ' ';
    131 				ocol++;
    132 			}
    133 			if (*cp == 0 || c == 0) {
    134 				strcpy(dp, cp);
    135 				return;
    136 			}
    137 			*dp++ = *cp;
    138 			ocol++, dcol++;
    139 		}
    140 		cp++;
    141 	}
    142 }
    143