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 * $FreeBSD: src/usr.bin/colrm/colrm.c,v 1.7.2.1 2001/08/02 01:33:29 obrien Exp $ 34 * $DragonFly: src/usr.bin/colrm/colrm.c,v 1.2 2003/06/17 04:29:25 dillon Exp $ 35 * 36 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)colrm.c 8.2 (Berkeley) 5/4/95 38 */ 39 40 #include <sys/types.h> 41 #include <limits.h> 42 #include <err.h> 43 #include <errno.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #define TAB 8 50 51 int main __P((int, char *[])); 52 void check __P((FILE *)); 53 static void usage __P((void)); 54 55 int 56 main(argc, argv) 57 int argc; 58 char *argv[]; 59 { 60 register u_long column, start, stop; 61 register int ch; 62 char *p; 63 64 while ((ch = getopt(argc, argv, "")) != -1) 65 switch(ch) { 66 case '?': 67 default: 68 usage(); 69 } 70 argc -= optind; 71 argv += optind; 72 73 start = stop = 0; 74 switch(argc) { 75 case 2: 76 stop = strtol(argv[1], &p, 10); 77 if (stop <= 0 || *p) 78 errx(1, "illegal column -- %s", argv[1]); 79 /* FALLTHROUGH */ 80 case 1: 81 start = strtol(argv[0], &p, 10); 82 if (start <= 0 || *p) 83 errx(1, "illegal column -- %s", argv[0]); 84 break; 85 case 0: 86 break; 87 default: 88 usage(); 89 } 90 91 if (stop && start > stop) 92 errx(1, "illegal start and stop columns"); 93 94 for (column = 0;;) { 95 switch (ch = getchar()) { 96 case EOF: 97 check(stdin); 98 break; 99 case '\b': 100 if (column) 101 --column; 102 break; 103 case '\n': 104 column = 0; 105 break; 106 case '\t': 107 column = (column + TAB) & ~(TAB - 1); 108 break; 109 default: 110 ++column; 111 break; 112 } 113 114 if ((!start || column < start || (stop && column > stop)) && 115 putchar(ch) == EOF) 116 check(stdout); 117 } 118 } 119 120 void 121 check(stream) 122 FILE *stream; 123 { 124 if (feof(stream)) 125 exit(0); 126 if (ferror(stream)) 127 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 128 } 129 130 void 131 usage() 132 { 133 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 134 exit(1); 135 } 136 137