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 * $FreeBSD: src/usr.bin/colrm/colrm.c,v 1.7.2.1 2001/08/02 01:33:29 obrien Exp $ 30 * $DragonFly: src/usr.bin/colrm/colrm.c,v 1.5 2005/08/04 17:31:22 drhodus Exp $ 31 * 32 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 33 * @(#)colrm.c 8.2 (Berkeley) 5/4/95 34 */ 35 36 #include <sys/types.h> 37 #include <limits.h> 38 #include <err.h> 39 #include <errno.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #define TAB 8 46 47 int main(int, char *[]); 48 void check(FILE *); 49 static void usage(void); 50 51 int 52 main(int argc, char **argv) 53 { 54 u_long column, start, stop; 55 int ch; 56 char *p; 57 58 while ((ch = getopt(argc, argv, "")) != -1) 59 switch(ch) { 60 case '?': 61 default: 62 usage(); 63 } 64 argc -= optind; 65 argv += optind; 66 67 start = stop = 0; 68 switch(argc) { 69 case 2: 70 stop = strtol(argv[1], &p, 10); 71 if (stop <= 0 || *p) 72 errx(1, "illegal column -- %s", argv[1]); 73 /* FALLTHROUGH */ 74 case 1: 75 start = strtol(argv[0], &p, 10); 76 if (start <= 0 || *p) 77 errx(1, "illegal column -- %s", argv[0]); 78 break; 79 case 0: 80 break; 81 default: 82 usage(); 83 } 84 85 if (stop && start > stop) 86 errx(1, "illegal start and stop columns"); 87 88 for (column = 0;;) { 89 switch (ch = getchar()) { 90 case EOF: 91 check(stdin); 92 break; 93 case '\b': 94 if (column) 95 --column; 96 break; 97 case '\n': 98 column = 0; 99 break; 100 case '\t': 101 column = (column + TAB) & ~(TAB - 1); 102 break; 103 default: 104 ++column; 105 break; 106 } 107 108 if ((!start || column < start || (stop && column > stop)) && 109 putchar(ch) == EOF) 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