/usr.bin/expand/expand.c

  1/*
  2 * Copyright (c) 1980, 1993
  3 *	The Regents of the University of California.  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 * 4. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#ifndef lint
 31static const char copyright[] =
 32"@(#) Copyright (c) 1980, 1993\n\
 33	The Regents of the University of California.  All rights reserved.\n";
 34#endif /* not lint */
 35
 36#ifndef lint
 37#if 0
 38static char sccsid[] = "@(#)expand.c	8.1 (Berkeley) 6/9/93";
 39#endif
 40#endif /* not lint */
 41#include <sys/cdefs.h>
 42__FBSDID("$FreeBSD$");
 43
 44#include <ctype.h>
 45#include <err.h>
 46#include <locale.h>
 47#include <stdio.h>
 48#include <stdlib.h>
 49#include <unistd.h>
 50#include <wchar.h>
 51#include <wctype.h>
 52
 53/*
 54 * expand - expand tabs to equivalent spaces
 55 */
 56static int	nstops;
 57static int	tabstops[100];
 58
 59static void getstops(char *);
 60static void usage(void);
 61
 62int
 63main(int argc, char *argv[])
 64{
 65	const char *curfile;
 66	wint_t wc;
 67	int c, column;
 68	int n;
 69	int rval;
 70	int width;
 71
 72	setlocale(LC_CTYPE, "");
 73
 74	/* handle obsolete syntax */
 75	while (argc > 1 && argv[1][0] == '-' &&
 76	    isdigit((unsigned char)argv[1][1])) {
 77		getstops(&argv[1][1]);
 78		argc--; argv++;
 79	}
 80
 81	while ((c = getopt (argc, argv, "t:")) != -1) {
 82		switch (c) {
 83		case 't':
 84			getstops(optarg);
 85			break;
 86		case '?':
 87		default:
 88			usage();
 89			/* NOTREACHED */
 90		}
 91	}
 92	argc -= optind;
 93	argv += optind;
 94
 95	rval = 0;
 96	do {
 97		if (argc > 0) {
 98			if (freopen(argv[0], "r", stdin) == NULL) {
 99				warn("%s", argv[0]);
100				rval = 1;
101				argc--, argv++;
102				continue;
103			}
104			curfile = argv[0];
105			argc--, argv++;
106		} else
107			curfile = "stdin";
108		column = 0;
109		while ((wc = getwchar()) != WEOF) {
110			switch (wc) {
111			case '\t':
112				if (nstops == 0) {
113					do {
114						putwchar(' ');
115						column++;
116					} while (column & 07);
117					continue;
118				}
119				if (nstops == 1) {
120					do {
121						putwchar(' ');
122						column++;
123					} while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
124					continue;
125				}
126				for (n = 0; n < nstops; n++)
127					if (tabstops[n] > column)
128						break;
129				if (n == nstops) {
130					putwchar(' ');
131					column++;
132					continue;
133				}
134				while (column < tabstops[n]) {
135					putwchar(' ');
136					column++;
137				}
138				continue;
139
140			case '\b':
141				if (column)
142					column--;
143				putwchar('\b');
144				continue;
145
146			default:
147				putwchar(wc);
148				if ((width = wcwidth(wc)) > 0)
149					column += width;
150				continue;
151
152			case '\n':
153				putwchar(wc);
154				column = 0;
155				continue;
156			}
157		}
158		if (ferror(stdin)) {
159			warn("%s", curfile);
160			rval = 1;
161		}
162	} while (argc > 0);
163	exit(rval);
164}
165
166static void
167getstops(char *cp)
168{
169	int i;
170
171	nstops = 0;
172	for (;;) {
173		i = 0;
174		while (*cp >= '0' && *cp <= '9')
175			i = i * 10 + *cp++ - '0';
176		if (i <= 0)
177			errx(1, "bad tab stop spec");
178		if (nstops > 0 && i <= tabstops[nstops-1])
179			errx(1, "bad tab stop spec");
180		if (nstops == sizeof(tabstops) / sizeof(*tabstops))
181			errx(1, "too many tab stops");
182		tabstops[nstops++] = i;
183		if (*cp == 0)
184			break;
185		if (*cp != ',' && !isblank((unsigned char)*cp))
186			errx(1, "bad tab stop spec");
187		cp++;
188	}
189}
190
191static void
192usage(void)
193{
194	(void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
195	exit(1);
196}