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unexpand.c revision 1.9 
      1 /*	$NetBSD: unexpand.c,v 1.9 2003/04/08 09:44:47 dsl 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 1.9 2003/04/08 09:44:47 dsl Exp $");
     47 #endif /* not lint */
     48 
     49 /*
     50  * unexpand - put tabs into a file replacing blanks
     51  */
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include <unistd.h>
     56 
     57 char	genbuf[BUFSIZ];
     58 char	linebuf[BUFSIZ];
     59 
     60 int	main(int, char **);
     61 void	tabify(int);
     62 
     63 int
     64 main(int argc, char **argv)
     65 {
     66 	int all, c;
     67 	char *cp;
     68 
     69 	all = 0;
     70 	while ((c = getopt(argc, argv, "a")) != -1) {
     71 		switch (c) {
     72 		case 'a':
     73 			all++;
     74 			break;
     75 		case '?':
     76 		default:
     77 			fprintf(stderr, "usage: unexpand [-a] [file ...]\n");
     78 			exit(EXIT_FAILURE);
     79 			/* NOTREACHED */
     80 		}
     81 	}
     82 	argc -= optind;
     83 	argv += optind;
     84 
     85 	do {
     86 		if (argc > 0) {
     87 			if (freopen(argv[0], "r", stdin) == NULL) {
     88 				perror(argv[0]);
     89 				exit(EXIT_FAILURE);
     90 			}
     91 			argc--, argv++;
     92 		}
     93 		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
     94 			for (cp = linebuf; *cp; cp++)
     95 				continue;
     96 			if (cp > linebuf)
     97 				cp[-1] = 0;
     98 			tabify(all);
     99 			printf("%s", linebuf);
    100 		}
    101 	} while (argc > 0);
    102 	exit(EXIT_SUCCESS);
    103 	/* NOTREACHED */
    104 }
    105 
    106 void
    107 tabify(c)
    108 	int c;
    109 {
    110 	char *cp, *dp;
    111 	int dcol;
    112 	int ocol;
    113 
    114 	ocol = 0;
    115 	dcol = 0;
    116 	cp = genbuf, dp = linebuf;
    117 	for (;;) {
    118 		switch (*cp) {
    119 
    120 		case ' ':
    121 			dcol++;
    122 			break;
    123 
    124 		case '\t':
    125 			dcol += 8;
    126 			dcol &= ~07;
    127 			break;
    128 
    129 		default:
    130 			while (((ocol + 8) &~ 07) <= dcol) {
    131 				if (ocol + 1 == dcol)
    132 					break;
    133 				*dp++ = '\t';
    134 				ocol += 8;
    135 				ocol &= ~07;
    136 			}
    137 			while (ocol < dcol) {
    138 				*dp++ = ' ';
    139 				ocol++;
    140 			}
    141 			if (*cp == 0 || c == 0) {
    142 				strcpy(dp, cp);
    143 				return;
    144 			}
    145 			*dp++ = *cp;
    146 			ocol++, dcol++;
    147 		}
    148 		cp++;
    149 	}
    150 }
    151