/usr.bin/colrm/colrm.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 142 lines · 97 code · 16 blank · 29 comment · 22 complexity · 879238a847d46052ba5fc3e9afe0a5ce MD5 · raw file
- /*-
- * Copyright (c) 1991, 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) 1991, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif
- #if 0
- #ifndef lint
- static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95";
- #endif
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/types.h>
- #include <err.h>
- #include <errno.h>
- #include <limits.h>
- #include <locale.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <wchar.h>
- #define TAB 8
- void check(FILE *);
- static void usage(void);
- int
- main(int argc, char *argv[])
- {
- u_long column, start, stop;
- int ch, width;
- char *p;
- setlocale(LC_ALL, "");
- while ((ch = getopt(argc, argv, "")) != -1)
- switch(ch) {
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
- start = stop = 0;
- switch(argc) {
- case 2:
- stop = strtol(argv[1], &p, 10);
- if (stop <= 0 || *p)
- errx(1, "illegal column -- %s", argv[1]);
- /* FALLTHROUGH */
- case 1:
- start = strtol(argv[0], &p, 10);
- if (start <= 0 || *p)
- errx(1, "illegal column -- %s", argv[0]);
- break;
- case 0:
- break;
- default:
- usage();
- }
- if (stop && start > stop)
- errx(1, "illegal start and stop columns");
- for (column = 0;;) {
- switch (ch = getwchar()) {
- case WEOF:
- check(stdin);
- break;
- case '\b':
- if (column)
- --column;
- break;
- case '\n':
- column = 0;
- break;
- case '\t':
- column = (column + TAB) & ~(TAB - 1);
- break;
- default:
- if ((width = wcwidth(ch)) > 0)
- column += width;
- break;
- }
- if ((!start || column < start || (stop && column > stop)) &&
- putwchar(ch) == WEOF)
- check(stdout);
- }
- }
- void
- check(FILE *stream)
- {
- if (feof(stream))
- exit(0);
- if (ferror(stream))
- err(1, "%s", stream == stdin ? "stdin" : "stdout");
- }
- void
- usage(void)
- {
- (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
- exit(1);
- }