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