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 1.4 2003/11/03 19:31:29 eirikn 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(int, char *[]); 52 void check(FILE *); 53 static void usage(void); 54 55 int 56 main(int argc, char **argv) 57 { 58 register u_long column, start, stop; 59 register int ch; 60 char *p; 61 62 while ((ch = getopt(argc, argv, "")) != -1) 63 switch(ch) { 64 case '?': 65 default: 66 usage(); 67 } 68 argc -= optind; 69 argv += optind; 70 71 start = stop = 0; 72 switch(argc) { 73 case 2: 74 stop = strtol(argv[1], &p, 10); 75 if (stop <= 0 || *p) 76 errx(1, "illegal column -- %s", argv[1]); 77 /* FALLTHROUGH */ 78 case 1: 79 start = strtol(argv[0], &p, 10); 80 if (start <= 0 || *p) 81 errx(1, "illegal column -- %s", argv[0]); 82 break; 83 case 0: 84 break; 85 default: 86 usage(); 87 } 88 89 if (stop && start > stop) 90 errx(1, "illegal start and stop columns"); 91 92 for (column = 0;;) { 93 switch (ch = getchar()) { 94 case EOF: 95 check(stdin); 96 break; 97 case '\b': 98 if (column) 99 --column; 100 break; 101 case '\n': 102 column = 0; 103 break; 104 case '\t': 105 column = (column + TAB) & ~(TAB - 1); 106 break; 107 default: 108 ++column; 109 break; 110 } 111 112 if ((!start || column < start || (stop && column > stop)) && 113 putchar(ch) == EOF) 114 check(stdout); 115 } 116 } 117 118 void 119 check(FILE *stream) 120 { 121 if (feof(stream)) 122 exit(0); 123 if (ferror(stream)) 124 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 125 } 126 127 void 128 usage(void) 129 { 130 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 131 exit(1); 132 } 133 134