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unexpand.c revision 1.7 
      1 /*	$NetBSD: unexpand.c,v 1.7 1999/02/10 16:16:43 kleink 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 1.7 1999/02/10 16:16:43 kleink 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 __P((int, char **));
     61 void tabify __P((int));
     62 
     63 int
     64 main(argc, argv)
     65 	int argc;
     66 	char *argv[];
     67 {
     68 	int all, c;
     69 	char *cp;
     70 
     71 	all = 0;
     72 	while ((c = getopt(argc, argv, "a")) != -1) {
     73 		switch (c) {
     74 		case 'a':
     75 			all++;
     76 			break;
     77 		case '?':
     78 		default:
     79 			fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
     80 			exit(EXIT_FAILURE);
     81 			/* NOTREACHED */
     82 		}
     83 	}
     84 	argc -= optind;
     85 	argv += optind;
     86 
     87 	do {
     88 		if (argc > 0) {
     89 			if (freopen(argv[0], "r", stdin) == NULL) {
     90 				perror(argv[0]);
     91 				exit(EXIT_FAILURE);
     92 			}
     93 			argc--, argv++;
     94 		}
     95 		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
     96 			for (cp = linebuf; *cp; cp++)
     97 				continue;
     98 			if (cp > linebuf)
     99 				cp[-1] = 0;
    100 			tabify(all);
    101 			printf("%s", linebuf);
    102 		}
    103 	} while (argc > 0);
    104 	exit(EXIT_SUCCESS);
    105 	/* NOTREACHED */
    106 }
    107 
    108 void
    109 tabify(c)
    110 	int c;
    111 {
    112 	char *cp, *dp;
    113 	int dcol;
    114 	int ocol;
    115 
    116 	ocol = 0;
    117 	dcol = 0;
    118 	cp = genbuf, dp = linebuf;
    119 	for (;;) {
    120 		switch (*cp) {
    121 
    122 		case ' ':
    123 			dcol++;
    124 			break;
    125 
    126 		case '\t':
    127 			dcol += 8;
    128 			dcol &= ~07;
    129 			break;
    130 
    131 		default:
    132 			while (((ocol + 8) &~ 07) <= dcol) {
    133 				if (ocol + 1 == dcol)
    134 					break;
    135 				*dp++ = '\t';
    136 				ocol += 8;
    137 				ocol &= ~07;
    138 			}
    139 			while (ocol < dcol) {
    140 				*dp++ = ' ';
    141 				ocol++;
    142 			}
    143 			if (*cp == 0 || c == 0) {
    144 				strcpy(dp, cp);
    145 				return;
    146 			}
    147 			*dp++ = *cp;
    148 			ocol++, dcol++;
    149 		}
    150 		cp++;
    151 	}
    152 }
    153