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 #endif 40 41 #include <sys/cdefs.h> 42 #include <sys/types.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <limits.h> 46 #include <locale.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include <wchar.h> 52 53 #define TAB 8 54 55 void check(FILE *); 56 static void usage(void) __dead2; 57 58 int 59 main(int argc, char *argv[]) 60 { 61 u_long column, start, stop; 62 int ch, width; 63 char *p; 64 65 setlocale(LC_ALL, ""); 66 67 while ((ch = getopt(argc, argv, "")) != -1) 68 switch(ch) { 69 case '?': 70 default: 71 usage(); 72 } 73 argc -= optind; 74 argv += optind; 75 76 start = stop = 0; 77 switch(argc) { 78 case 2: 79 stop = strtol(argv[1], &p, 10); 80 if (stop <= 0 || *p) 81 errx(1, "illegal column -- %s", argv[1]); 82 /* FALLTHROUGH */ 83 case 1: 84 start = strtol(argv[0], &p, 10); 85 if (start <= 0 || *p) 86 errx(1, "illegal column -- %s", argv[0]); 87 break; 88 case 0: 89 break; 90 default: 91 usage(); 92 } 93 94 if (stop && start > stop) 95 errx(1, "illegal start and stop columns"); 96 97 for (column = 0;;) { 98 switch (ch = getwchar()) { 99 case WEOF: 100 check(stdin); 101 break; 102 case '\b': 103 if (column) 104 --column; 105 break; 106 case '\n': 107 column = 0; 108 break; 109 case '\t': 110 column = (column + TAB) & ~(TAB - 1); 111 break; 112 default: 113 if ((width = wcwidth(ch)) > 0) 114 column += width; 115 break; 116 } 117 118 if ((!start || column < start || (stop && column > stop)) && 119 putwchar(ch) == WEOF) 120 check(stdout); 121 } 122 } 123 124 void 125 check(FILE *stream) 126 { 127 if (feof(stream)) 128 exit(0); 129 if (ferror(stream)) 130 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 131 } 132 133 void 134 usage(void) 135 { 136 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 137 exit(1); 138 } 139 140