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(int argc, char *argv[]) 65 { 66 u_long column, start, stop; 67 int ch; 68 char *p; 69 70 while ((ch = getopt(argc, argv, "")) != -1) 71 switch(ch) { 72 case '?': 73 default: 74 usage(); 75 } 76 argc -= optind; 77 argv += optind; 78 79 start = stop = 0; 80 switch(argc) { 81 case 2: 82 stop = strtol(argv[1], &p, 10); 83 if (stop <= 0 || *p) 84 errx(1, "illegal column -- %s", argv[1]); 85 /* FALLTHROUGH */ 86 case 1: 87 start = strtol(argv[0], &p, 10); 88 if (start <= 0 || *p) 89 errx(1, "illegal column -- %s", argv[0]); 90 break; 91 case 0: 92 break; 93 default: 94 usage(); 95 } 96 97 if (stop && start > stop) 98 errx(1, "illegal start and stop columns"); 99 100 for (column = 0;;) { 101 switch (ch = getchar()) { 102 case EOF: 103 check(stdin); 104 break; 105 case '\b': 106 if (column) 107 --column; 108 break; 109 case '\n': 110 column = 0; 111 break; 112 case '\t': 113 column = (column + TAB) & ~(TAB - 1); 114 break; 115 default: 116 ++column; 117 break; 118 } 119 120 if ((!start || column < start || (stop && column > stop)) && 121 putchar(ch) == EOF) 122 check(stdout); 123 } 124 } 125 126 void 127 check(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(void) 137 { 138 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 139 exit(1); 140 } 141 142