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 char copyright[] = 36 "@(#) Copyright (c) 1991, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)colrm.c 8.1 (Berkeley) 6/6/93"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <limits.h> 46 #include <errno.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #define TAB 8 52 53 void err __P((const char *, ...)); 54 void check __P((FILE *)); 55 void usage __P((void)); 56 57 int 58 main(argc, argv) 59 int argc; 60 char *argv[]; 61 { 62 register u_long column, start, stop; 63 register int ch; 64 char *p; 65 66 while ((ch = getopt(argc, argv, "")) != EOF) 67 switch(ch) { 68 case '?': 69 default: 70 usage(); 71 } 72 argc -= optind; 73 argv += optind; 74 75 start = stop = 0; 76 switch(argc) { 77 case 2: 78 stop = strtol(argv[1], &p, 10); 79 if (stop <= 0 || *p) 80 err("illegal column -- %s", argv[1]); 81 /* FALLTHROUGH */ 82 case 1: 83 start = strtol(argv[0], &p, 10); 84 if (start <= 0 || *p) 85 err("illegal column -- %s", argv[0]); 86 break; 87 case 0: 88 break; 89 default: 90 usage(); 91 } 92 93 if (stop && start > stop) 94 err("illegal start and stop columns"); 95 96 for (column = 0;;) { 97 switch (ch = getchar()) { 98 case EOF: 99 check(stdin); 100 break; 101 case '\b': 102 if (column) 103 --column; 104 break; 105 case '\n': 106 column = 0; 107 break; 108 case '\t': 109 column = (column + TAB) & ~(TAB - 1); 110 break; 111 default: 112 ++column; 113 break; 114 } 115 116 if ((!start || column < start || stop && column > stop) && 117 putchar(ch) == EOF) 118 check(stdout); 119 } 120 } 121 122 void 123 check(stream) 124 FILE *stream; 125 { 126 if (feof(stream)) 127 exit(0); 128 if (ferror(stream)) 129 err("%s: %s", 130 stream == stdin ? "stdin" : "stdout", strerror(errno)); 131 } 132 133 void 134 usage() 135 { 136 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 137 exit(1); 138 } 139 140 #if __STDC__ 141 #include <stdarg.h> 142 #else 143 #include <varargs.h> 144 #endif 145 146 void 147 #if __STDC__ 148 err(const char *fmt, ...) 149 #else 150 err(fmt, va_alist) 151 char *fmt; 152 va_dcl 153 #endif 154 { 155 va_list ap; 156 #if __STDC__ 157 va_start(ap, fmt); 158 #else 159 va_start(ap); 160 #endif 161 (void)fprintf(stderr, "colrm: "); 162 (void)vfprintf(stderr, fmt, ap); 163 va_end(ap); 164 (void)fprintf(stderr, "\n"); 165 exit(1); 166 /* NOTREACHED */ 167 } 168