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 8.2 (Berkeley) 5/4/95"; 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 #include <unistd.h> 51 52 #define TAB 8 53 54 void err __P((const char *, ...)); 55 void check __P((FILE *)); 56 void usage __P((void)); 57 58 int 59 main(argc, argv) 60 int argc; 61 char *argv[]; 62 { 63 register u_long column, start, stop; 64 register int ch; 65 char *p; 66 67 while ((ch = getopt(argc, argv, "")) != -1) 68 switch(ch) { 69 case '?': 70 default: 71 usage(); 72 } 73 argc -= optind; 74 argv += optind; 75 76 start = stop = 0; 77 switch(argc) { 78 case 2: 79 stop = strtol(argv[1], &p, 10); 80 if (stop <= 0 || *p) 81 err("illegal column -- %s", argv[1]); 82 /* FALLTHROUGH */ 83 case 1: 84 start = strtol(argv[0], &p, 10); 85 if (start <= 0 || *p) 86 err("illegal column -- %s", argv[0]); 87 break; 88 case 0: 89 break; 90 default: 91 usage(); 92 } 93 94 if (stop && start > stop) 95 err("illegal start and stop columns"); 96 97 for (column = 0;;) { 98 switch (ch = getchar()) { 99 case EOF: 100 check(stdin); 101 break; 102 case '\b': 103 if (column) 104 --column; 105 break; 106 case '\n': 107 column = 0; 108 break; 109 case '\t': 110 column = (column + TAB) & ~(TAB - 1); 111 break; 112 default: 113 ++column; 114 break; 115 } 116 117 if ((!start || column < start || stop && column > stop) && 118 putchar(ch) == EOF) 119 check(stdout); 120 } 121 } 122 123 void 124 check(stream) 125 FILE *stream; 126 { 127 if (feof(stream)) 128 exit(0); 129 if (ferror(stream)) 130 err("%s: %s", 131 stream == stdin ? "stdin" : "stdout", strerror(errno)); 132 } 133 134 void 135 usage() 136 { 137 (void)fprintf(stderr, "usage: colrm [start [stop]]\n"); 138 exit(1); 139 } 140 141 #if __STDC__ 142 #include <stdarg.h> 143 #else 144 #include <varargs.h> 145 #endif 146 147 void 148 #if __STDC__ 149 err(const char *fmt, ...) 150 #else 151 err(fmt, va_alist) 152 char *fmt; 153 va_dcl 154 #endif 155 { 156 va_list ap; 157 #if __STDC__ 158 va_start(ap, fmt); 159 #else 160 va_start(ap); 161 #endif 162 (void)fprintf(stderr, "colrm: "); 163 (void)vfprintf(stderr, fmt, ap); 164 va_end(ap); 165 (void)fprintf(stderr, "\n"); 166 exit(1); 167 /* NOTREACHED */ 168 } 169