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 * $Id: colrm.c,v 1.5 1997/12/29 00:08:59 alex Exp $ 34 */ 35 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1991, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static const char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <limits.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #define TAB 8 56 57 void check __P((FILE *)); 58 static void usage __P((void)); 59 60 int 61 main(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 register u_long column, start, stop; 66 register int ch; 67 char *p; 68 69 while ((ch = getopt(argc, argv, "")) != -1) 70 switch(ch) { 71 case '?': 72 default: 73 usage(); 74 } 75 argc -= optind; 76 argv += optind; 77 78 start = stop = 0; 79 switch(argc) { 80 case 2: 81 stop = strtol(argv[1], &p, 10); 82 if (stop <= 0 || *p) 83 errx(1, "illegal column -- %s", argv[1]); 84 /* FALLTHROUGH */ 85 case 1: 86 start = strtol(argv[0], &p, 10); 87 if (start <= 0 || *p) 88 errx(1, "illegal column -- %s", argv[0]); 89 break; 90 case 0: 91 break; 92 default: 93 usage(); 94 } 95 96 if (stop && start > stop) 97 errx(1, "illegal start and stop columns"); 98 99 for (column = 0;;) { 100 switch (ch = getchar()) { 101 case EOF: 102 check(stdin); 103 break; 104 case '\b': 105 if (column) 106 --column; 107 break; 108 case '\n': 109 column = 0; 110 break; 111 case '\t': 112 column = (column + TAB) & ~(TAB - 1); 113 break; 114 default: 115 ++column; 116 break; 117 } 118 119 if ((!start || column < start || (stop && column > stop)) && 120 putchar(ch) == EOF) 121 check(stdout); 122 } 123 } 124 125 void 126 check(stream) 127 FILE *stream; 128 { 129 if (feof(stream)) 130 exit(0); 131 if (ferror(stream)) 132 err(1, "%s", stream == stdin ? "stdin" : "stdout"); 133 } 134 135 void 136 usage() 137 { 138 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 139 exit(1); 140 } 141 142