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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1991, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95"; 43 #endif 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <limits.h> 53 #include <locale.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 #include <wchar.h> 59 60 #define TAB 8 61 62 void check(FILE *); 63 static void usage(void); 64 65 int 66 main(int argc, char *argv[]) 67 { 68 u_long column, start, stop; 69 int ch, width; 70 char *p; 71 72 setlocale(LC_ALL, ""); 73 74 while ((ch = getopt(argc, argv, "")) != -1) 75 switch(ch) { 76 case '?': 77 default: 78 usage(); 79 } 80 argc -= optind; 81 argv += optind; 82 83 start = stop = 0; 84 switch(argc) { 85 case 2: 86 stop = strtol(argv[1], &p, 10); 87 if (stop <= 0 || *p) 88 errx(1, "illegal column -- %s", argv[1]); 89 /* FALLTHROUGH */ 90 case 1: 91 start = strtol(argv[0], &p, 10); 92 if (start <= 0 || *p) 93 errx(1, "illegal column -- %s", argv[0]); 94 break; 95 case 0: 96 break; 97 default: 98 usage(); 99 } 100 101 if (stop && start > stop) 102 errx(1, "illegal start and stop columns"); 103 104 for (column = 0;;) { 105 switch (ch = getwchar()) { 106 case WEOF: 107 check(stdin); 108 break; 109 case '\b': 110 if (column) 111 --column; 112 break; 113 case '\n': 114 column = 0; 115 break; 116 case '\t': 117 column = (column + TAB) & ~(TAB - 1); 118 break; 119 default: 120 if ((width = wcwidth(ch)) > 0) 121 column += width; 122 break; 123 } 124 125 if ((!start || column < start || (stop && column > stop)) && 126 putwchar(ch) == WEOF) 127 check(stdout); 128 } 129 } 130 131 void 132 check(FILE *stream) 133 { 134 if (feof(stream)) 135 exit(0); 136 if (ferror(stream)) 137 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 138 } 139 140 void 141 usage(void) 142 { 143 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 144 exit(1); 145 } 146 147