1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1991, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95"; 41 #endif 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/types.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <limits.h> 51 #include <locale.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 #include <wchar.h> 57 58 #define TAB 8 59 60 void check(FILE *); 61 static void usage(void); 62 63 int 64 main(int argc, char *argv[]) 65 { 66 u_long column, start, stop; 67 int ch, width; 68 char *p; 69 70 setlocale(LC_ALL, ""); 71 72 while ((ch = getopt(argc, argv, "")) != -1) 73 switch(ch) { 74 case '?': 75 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 start = stop = 0; 82 switch(argc) { 83 case 2: 84 stop = strtol(argv[1], &p, 10); 85 if (stop <= 0 || *p) 86 errx(1, "illegal column -- %s", argv[1]); 87 /* FALLTHROUGH */ 88 case 1: 89 start = strtol(argv[0], &p, 10); 90 if (start <= 0 || *p) 91 errx(1, "illegal column -- %s", argv[0]); 92 break; 93 case 0: 94 break; 95 default: 96 usage(); 97 } 98 99 if (stop && start > stop) 100 errx(1, "illegal start and stop columns"); 101 102 for (column = 0;;) { 103 switch (ch = getwchar()) { 104 case WEOF: 105 check(stdin); 106 break; 107 case '\b': 108 if (column) 109 --column; 110 break; 111 case '\n': 112 column = 0; 113 break; 114 case '\t': 115 column = (column + TAB) & ~(TAB - 1); 116 break; 117 default: 118 if ((width = wcwidth(ch)) > 0) 119 column += width; 120 break; 121 } 122 123 if ((!start || column < start || (stop && column > stop)) && 124 putwchar(ch) == WEOF) 125 check(stdout); 126 } 127 } 128 129 void 130 check(FILE *stream) 131 { 132 if (feof(stream)) 133 exit(0); 134 if (ferror(stream)) 135 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 136 } 137 138 void 139 usage(void) 140 { 141 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 142 exit(1); 143 } 144 145