1 /* $OpenBSD: comm.c,v 1.4 2000/11/21 18:06:45 aaron Exp $ */ 2 /* $NetBSD: comm.c,v 1.10 1995/09/05 19:57:43 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Case Larsen. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #ifndef lint 41 static char copyright[] = 42 "@(#) Copyright (c) 1989, 1993, 1994\n\ 43 The Regents of the University of California. All rights reserved.\n"; 44 #endif /* not lint */ 45 46 #ifndef lint 47 #if 0 48 static char sccsid[] = "@(#)comm.c 8.4 (Berkeley) 5/4/95"; 49 #endif 50 static char rcsid[] = "$OpenBSD: comm.c,v 1.4 2000/11/21 18:06:45 aaron Exp $"; 51 #endif /* not lint */ 52 53 #include <err.h> 54 #include <limits.h> 55 #include <locale.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #define MAXLINELEN (LINE_MAX + 1) 62 63 char *tabs[] = { "", "\t", "\t\t" }; 64 65 FILE *file __P((const char *)); 66 void show __P((FILE *, char *, char *)); 67 void usage __P((void)); 68 69 int 70 main(argc, argv) 71 int argc; 72 char **argv; 73 { 74 int comp, file1done, file2done, read1, read2; 75 int ch, flag1, flag2, flag3; 76 FILE *fp1, *fp2; 77 char *col1, *col2, *col3; 78 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 79 int (*compare) __P((const char * ,const char *)); 80 81 setlocale(LC_ALL, ""); 82 83 flag1 = flag2 = flag3 = 1; 84 compare = strcoll; 85 while ((ch = getopt(argc, argv, "123f")) != -1) 86 switch(ch) { 87 case '1': 88 flag1 = 0; 89 break; 90 case '2': 91 flag2 = 0; 92 break; 93 case '3': 94 flag3 = 0; 95 break; 96 case 'f': 97 compare = strcasecmp; 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (argc != 2) 107 usage(); 108 109 fp1 = file(argv[0]); 110 fp2 = file(argv[1]); 111 112 /* for each column printed, add another tab offset */ 113 p = tabs; 114 col1 = col2 = col3 = NULL; 115 if (flag1) 116 col1 = *p++; 117 if (flag2) 118 col2 = *p++; 119 if (flag3) 120 col3 = *p; 121 122 for (read1 = read2 = 1;;) { 123 /* read next line, check for EOF */ 124 if (read1) 125 file1done = !fgets(line1, MAXLINELEN, fp1); 126 if (read2) 127 file2done = !fgets(line2, MAXLINELEN, fp2); 128 129 /* if one file done, display the rest of the other file */ 130 if (file1done) { 131 if (!file2done && col2) 132 show(fp2, col2, line2); 133 break; 134 } 135 if (file2done) { 136 if (!file1done && col1) 137 show(fp1, col1, line1); 138 break; 139 } 140 141 /* lines are the same */ 142 if (!(comp = compare(line1, line2))) { 143 read1 = read2 = 1; 144 if (col3) 145 if (printf("%s%s", col3, line1) < 0) 146 break; 147 continue; 148 } 149 150 /* lines are different */ 151 if (comp < 0) { 152 read1 = 1; 153 read2 = 0; 154 if (col1) 155 if (printf("%s%s", col1, line1) < 0) 156 break; 157 } else { 158 read1 = 0; 159 read2 = 1; 160 if (col2) 161 if (printf("%s%s", col2, line2) < 0) 162 break; 163 } 164 } 165 166 if (ferror (stdout) || fclose (stdout) == EOF) 167 err(1, "stdout"); 168 169 exit(0); 170 } 171 172 void 173 show(fp, offset, buf) 174 FILE *fp; 175 char *offset, *buf; 176 { 177 while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp)) 178 ; 179 } 180 181 FILE * 182 file(name) 183 const char *name; 184 { 185 FILE *fp; 186 187 if (!strcmp(name, "-")) 188 return (stdin); 189 if ((fp = fopen(name, "r")) == NULL) 190 err(1, "%s", name); 191 return (fp); 192 } 193 194 void 195 usage() 196 { 197 (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n"); 198 exit(1); 199 } 200