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 #include <sys/types.h> 33 #include <err.h> 34 #include <errno.h> 35 #include <limits.h> 36 #include <locale.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include <wchar.h> 42 43 #define TAB 8 44 45 void check(FILE *); 46 static void usage(void) __dead2; 47 48 int 49 main(int argc, char *argv[]) 50 { 51 u_long column, start, stop; 52 int ch, width; 53 char *p; 54 55 setlocale(LC_ALL, ""); 56 57 while ((ch = getopt(argc, argv, "")) != -1) 58 switch(ch) { 59 case '?': 60 default: 61 usage(); 62 } 63 argc -= optind; 64 argv += optind; 65 66 start = stop = 0; 67 switch(argc) { 68 case 2: 69 stop = strtol(argv[1], &p, 10); 70 if (stop <= 0 || *p) 71 errx(1, "illegal column -- %s", argv[1]); 72 /* FALLTHROUGH */ 73 case 1: 74 start = strtol(argv[0], &p, 10); 75 if (start <= 0 || *p) 76 errx(1, "illegal column -- %s", argv[0]); 77 break; 78 case 0: 79 break; 80 default: 81 usage(); 82 } 83 84 if (stop && start > stop) 85 errx(1, "illegal start and stop columns"); 86 87 for (column = 0;;) { 88 switch (ch = getwchar()) { 89 case WEOF: 90 check(stdin); 91 break; 92 case '\b': 93 if (column) 94 --column; 95 break; 96 case '\n': 97 column = 0; 98 break; 99 case '\t': 100 column = (column + TAB) & ~(TAB - 1); 101 break; 102 default: 103 if ((width = wcwidth(ch)) > 0) 104 column += width; 105 break; 106 } 107 108 if ((!start || column < start || (stop && column > stop)) && 109 putwchar(ch) == WEOF) 110 check(stdout); 111 } 112 } 113 114 void 115 check(FILE *stream) 116 { 117 if (feof(stream)) 118 exit(0); 119 if (ferror(stream)) 120 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 121 } 122 123 void 124 usage(void) 125 { 126 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 127 exit(1); 128 } 129 130