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 <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #define TAB 8 59 60 void check(FILE *); 61 static void usage(void); 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 u_long column, start, stop; 69 int ch; 70 char *p; 71 72 while ((ch = getopt(argc, argv, "")) != -1) 73 switch(ch) { 74 case '?': 75 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 start = stop = 0; 82 switch(argc) { 83 case 2: 84 stop = strtol(argv[1], &p, 10); 85 if (stop <= 0 || *p) 86 errx(1, "illegal column -- %s", argv[1]); 87 /* FALLTHROUGH */ 88 case 1: 89 start = strtol(argv[0], &p, 10); 90 if (start <= 0 || *p) 91 errx(1, "illegal column -- %s", argv[0]); 92 break; 93 case 0: 94 break; 95 default: 96 usage(); 97 } 98 99 if (stop && start > stop) 100 errx(1, "illegal start and stop columns"); 101 102 for (column = 0;;) { 103 switch (ch = getchar()) { 104 case EOF: 105 check(stdin); 106 break; 107 case '\b': 108 if (column) 109 --column; 110 break; 111 case '\n': 112 column = 0; 113 break; 114 case '\t': 115 column = (column + TAB) & ~(TAB - 1); 116 break; 117 default: 118 ++column; 119 break; 120 } 121 122 if ((!start || column < start || (stop && column > stop)) && 123 putchar(ch) == EOF) 124 check(stdout); 125 } 126 } 127 128 void 129 check(stream) 130 FILE *stream; 131 { 132 if (feof(stream)) 133 exit(0); 134 if (ferror(stream)) 135 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 136 } 137 138 void 139 usage() 140 { 141 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 142 exit(1); 143 } 144 145