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unexpand.c revision 1.1.1.1 
      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[] = "@(#)unexpand.c	5.3 (Berkeley) 4/18/91";
     42 #endif /* not lint */
     43 
     44 /*
     45  * unexpand - put tabs into a file replacing blanks
     46  */
     47 #include <stdio.h>
     48 
     49 char	genbuf[BUFSIZ];
     50 char	linebuf[BUFSIZ];
     51 int	all;
     52 
     53 main(argc, argv)
     54 	int argc;
     55 	char *argv[];
     56 {
     57 	register char *cp;
     58 
     59 	argc--, argv++;
     60 	if (argc > 0 && argv[0][0] == '-') {
     61 		if (strcmp(argv[0], "-a") != 0) {
     62 			fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
     63 			exit(1);
     64 		}
     65 		all++;
     66 		argc--, argv++;
     67 	}
     68 	do {
     69 		if (argc > 0) {
     70 			if (freopen(argv[0], "r", stdin) == NULL) {
     71 				perror(argv[0]);
     72 				exit(1);
     73 			}
     74 			argc--, argv++;
     75 		}
     76 		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
     77 			for (cp = linebuf; *cp; cp++)
     78 				continue;
     79 			if (cp > linebuf)
     80 				cp[-1] = 0;
     81 			tabify(all);
     82 			printf("%s", linebuf);
     83 		}
     84 	} while (argc > 0);
     85 	exit(0);
     86 }
     87 
     88 tabify(c)
     89 	char c;
     90 {
     91 	register char *cp, *dp;
     92 	register int dcol;
     93 	int ocol;
     94 
     95 	ocol = 0;
     96 	dcol = 0;
     97 	cp = genbuf, dp = linebuf;
     98 	for (;;) {
     99 		switch (*cp) {
    100 
    101 		case ' ':
    102 			dcol++;
    103 			break;
    104 
    105 		case '\t':
    106 			dcol += 8;
    107 			dcol &= ~07;
    108 			break;
    109 
    110 		default:
    111 			while (((ocol + 8) &~ 07) <= dcol) {
    112 				if (ocol + 1 == dcol)
    113 					break;
    114 				*dp++ = '\t';
    115 				ocol += 8;
    116 				ocol &= ~07;
    117 			}
    118 			while (ocol < dcol) {
    119 				*dp++ = ' ';
    120 				ocol++;
    121 			}
    122 			if (*cp == 0 || c == 0) {
    123 				strcpy(dp, cp);
    124 				return;
    125 			}
    126 			*dp++ = *cp;
    127 			ocol++, dcol++;
    128 		}
    129 		cp++;
    130 	}
    131 }
    132