/usr.bin/expand/expand.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 196 lines · 147 code · 16 blank · 33 comment · 41 complexity · d94c99d381c2594a2802977ea260309e MD5 · raw file
- /*
- * Copyright (c) 1980, 1993
- * 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.
- * 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
- static const char copyright[] =
- "@(#) Copyright (c) 1980, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
- #endif
- #endif /* not lint */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <ctype.h>
- #include <err.h>
- #include <locale.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <wchar.h>
- #include <wctype.h>
- /*
- * expand - expand tabs to equivalent spaces
- */
- static int nstops;
- static int tabstops[100];
- static void getstops(char *);
- static void usage(void);
- int
- main(int argc, char *argv[])
- {
- const char *curfile;
- wint_t wc;
- int c, column;
- int n;
- int rval;
- int width;
- setlocale(LC_CTYPE, "");
- /* handle obsolete syntax */
- while (argc > 1 && argv[1][0] == '-' &&
- isdigit((unsigned char)argv[1][1])) {
- getstops(&argv[1][1]);
- argc--; argv++;
- }
- while ((c = getopt (argc, argv, "t:")) != -1) {
- switch (c) {
- case 't':
- getstops(optarg);
- break;
- case '?':
- default:
- usage();
- /* NOTREACHED */
- }
- }
- argc -= optind;
- argv += optind;
- rval = 0;
- do {
- if (argc > 0) {
- if (freopen(argv[0], "r", stdin) == NULL) {
- warn("%s", argv[0]);
- rval = 1;
- argc--, argv++;
- continue;
- }
- curfile = argv[0];
- argc--, argv++;
- } else
- curfile = "stdin";
- column = 0;
- while ((wc = getwchar()) != WEOF) {
- switch (wc) {
- case '\t':
- if (nstops == 0) {
- do {
- putwchar(' ');
- column++;
- } while (column & 07);
- continue;
- }
- if (nstops == 1) {
- do {
- putwchar(' ');
- column++;
- } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
- continue;
- }
- for (n = 0; n < nstops; n++)
- if (tabstops[n] > column)
- break;
- if (n == nstops) {
- putwchar(' ');
- column++;
- continue;
- }
- while (column < tabstops[n]) {
- putwchar(' ');
- column++;
- }
- continue;
- case '\b':
- if (column)
- column--;
- putwchar('\b');
- continue;
- default:
- putwchar(wc);
- if ((width = wcwidth(wc)) > 0)
- column += width;
- continue;
- case '\n':
- putwchar(wc);
- column = 0;
- continue;
- }
- }
- if (ferror(stdin)) {
- warn("%s", curfile);
- rval = 1;
- }
- } while (argc > 0);
- exit(rval);
- }
- static void
- getstops(char *cp)
- {
- int i;
- nstops = 0;
- for (;;) {
- i = 0;
- while (*cp >= '0' && *cp <= '9')
- i = i * 10 + *cp++ - '0';
- if (i <= 0)
- errx(1, "bad tab stop spec");
- if (nstops > 0 && i <= tabstops[nstops-1])
- errx(1, "bad tab stop spec");
- if (nstops == sizeof(tabstops) / sizeof(*tabstops))
- errx(1, "too many tab stops");
- tabstops[nstops++] = i;
- if (*cp == 0)
- break;
- if (*cp != ',' && !isblank((unsigned char)*cp))
- errx(1, "bad tab stop spec");
- cp++;
- }
- }
- static void
- usage(void)
- {
- (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
- exit(1);
- }