xref: /src/usr.bin/expand/expand.c

/*
 * Copyright (c) 1980 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)expand.c	5.3 (Berkeley) 6/1/90";
#endif /* not lint */

#include <stdio.h>
/*
 * expand - expand tabs to equivalent spaces
 */
int	nstops;
int	tabstops[100];

main(argc, argv)
	int argc;
	char *argv[];
{
	register int c, column;
	register int n;

	argc--, argv++;
	do {
		while (argc > 0 && argv[0][0] == '-') {
			getstops(argv[0]);
			argc--, argv++;
		}
		if (argc > 0) {
			if (freopen(argv[0], "r", stdin) == NULL) {
				perror(argv[0]);
				exit(1);
			}
			argc--, argv++;
		}
		column = 0;
		for (;;) {
			c = getc(stdin);
			if (c == -1)
				break;
			switch (c) {

			case '\t':
				if (nstops == 0) {
					do {
						putchar(' ');
						column++;
					} while (column & 07);
					continue;
				}
				if (nstops == 1) {
					do {
						putchar(' ');
						column++;
					} while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
					continue;
				}
				for (n = 0; n < nstops; n++)
					if (tabstops[n] > column)
						break;
				if (n == nstops) {
					putchar(' ');
					column++;
					continue;
				}
				while (column < tabstops[n]) {
					putchar(' ');
					column++;
				}
				continue;

			case '\b':
				if (column)
					column--;
				putchar('\b');
				continue;

			default:
				putchar(c);
				column++;
				continue;

			case '\n':
				putchar(c);
				column = 0;
				continue;
			}
		}
	} while (argc > 0);
	exit(0);
}

getstops(cp)
	register char *cp;
{
	register int i;

	nstops = 0;
	cp++;
	for (;;) {
		i = 0;
		while (*cp >= '0' && *cp <= '9')
			i = i * 10 + *cp++ - '0';
		if (i <= 0 || i > 256) {
bad:
			fprintf(stderr, "Bad tab stop spec\n");
			exit(1);
		}
		if (nstops > 0 && i <= tabstops[nstops-1])
			goto bad;
		tabstops[nstops++] = i;
		if (*cp == 0)
			break;
		if (*cp++ != ',')
			goto bad;
	}
}