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 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1991, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #ifndef lint 45 static const char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95"; 46 #endif 47 48 #include <sys/types.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <limits.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #define TAB 8 58 59 void check __P((FILE *)); 60 static void usage __P((void)); 61 62 int 63 main(argc, argv) 64 int argc; 65 char *argv[]; 66 { 67 u_long column, start, stop; 68 int ch; 69 char *p; 70 71 while ((ch = getopt(argc, argv, "")) != -1) 72 switch(ch) { 73 case '?': 74 default: 75 usage(); 76 } 77 argc -= optind; 78 argv += optind; 79 80 start = stop = 0; 81 switch(argc) { 82 case 2: 83 stop = strtol(argv[1], &p, 10); 84 if (stop <= 0 || *p) 85 errx(1, "illegal column -- %s", argv[1]); 86 /* FALLTHROUGH */ 87 case 1: 88 start = strtol(argv[0], &p, 10); 89 if (start <= 0 || *p) 90 errx(1, "illegal column -- %s", argv[0]); 91 break; 92 case 0: 93 break; 94 default: 95 usage(); 96 } 97 98 if (stop && start > stop) 99 errx(1, "illegal start and stop columns"); 100 101 for (column = 0;;) { 102 switch (ch = getchar()) { 103 case EOF: 104 check(stdin); 105 break; 106 case '\b': 107 if (column) 108 --column; 109 break; 110 case '\n': 111 column = 0; 112 break; 113 case '\t': 114 column = (column + TAB) & ~(TAB - 1); 115 break; 116 default: 117 ++column; 118 break; 119 } 120 121 if ((!start || column < start || (stop && column > stop)) && 122 putchar(ch) == EOF) 123 check(stdout); 124 } 125 } 126 127 void 128 check(stream) 129 FILE *stream; 130 { 131 if (feof(stream)) 132 exit(0); 133 if (ferror(stream)) 134 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 135 } 136 137 void 138 usage() 139 { 140 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 141 exit(1); 142 } 143 144