1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Case Larsen. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 char copyright[] = 39 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ 40 All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 /*static char sccsid[] = "from: @(#)comm.c 5.7 (Berkeley) 11/1/90";*/ 45 static char rcsid[] = "$Id: comm.c,v 1.3 1993/09/21 23:20:36 jtc Exp $"; 46 #endif /* not lint */ 47 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <limits.h> 52 #include <locale.h> 53 54 #define MAXLINELEN (_POSIX2_LINE_MAX + 1) 55 56 char *tabs[] = { "", "\t", "\t\t" }; 57 58 FILE *file __P((const char *)); 59 void show __P((FILE *, char *, char *)); 60 void usage __P((void)); 61 62 int 63 main(argc,argv) 64 int argc; 65 char **argv; 66 { 67 register int comp, file1done, file2done, read1, read2; 68 register char *col1, *col2, *col3; 69 int ch, flag1, flag2, flag3; 70 FILE *fp1, *fp2; 71 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 72 73 setlocale(LC_ALL, ""); 74 75 flag1 = flag2 = flag3 = 1; 76 while ((ch = getopt(argc, argv, "123")) != -1) 77 switch(ch) { 78 case '1': 79 flag1 = 0; 80 break; 81 case '2': 82 flag2 = 0; 83 break; 84 case '3': 85 flag3 = 0; 86 break; 87 case '?': 88 default: 89 usage(); 90 } 91 argc -= optind; 92 argv += optind; 93 94 if (argc != 2) 95 usage(); 96 97 fp1 = file(argv[0]); 98 fp2 = file(argv[1]); 99 100 /* for each column printed, add another tab offset */ 101 p = tabs; 102 col1 = col2 = col3 = NULL; 103 if (flag1) 104 col1 = *p++; 105 if (flag2) 106 col2 = *p++; 107 if (flag3) 108 col3 = *p; 109 110 for (read1 = read2 = 1;;) { 111 /* read next line, check for EOF */ 112 if (read1) 113 file1done = !fgets(line1, MAXLINELEN, fp1); 114 if (read2) 115 file2done = !fgets(line2, MAXLINELEN, fp2); 116 117 /* if one file done, display the rest of the other file */ 118 if (file1done) { 119 if (!file2done && col2) 120 show(fp2, col2, line2); 121 break; 122 } 123 if (file2done) { 124 if (!file1done && col1) 125 show(fp1, col1, line1); 126 break; 127 } 128 129 /* lines are the same */ 130 if (!(comp = strcoll(line1, line2))) { 131 read1 = read2 = 1; 132 if (col3) 133 (void)printf("%s%s", col3, line1); 134 continue; 135 } 136 137 /* lines are different */ 138 if (comp < 0) { 139 read1 = 1; 140 read2 = 0; 141 if (col1) 142 (void)printf("%s%s", col1, line1); 143 } else { 144 read1 = 0; 145 read2 = 1; 146 if (col2) 147 (void)printf("%s%s", col2, line2); 148 } 149 } 150 exit(0); 151 } 152 153 void 154 show(fp, offset, buf) 155 FILE *fp; 156 char *offset, *buf; 157 { 158 do { 159 (void)printf("%s%s", offset, buf); 160 } while (fgets(buf, MAXLINELEN, fp)); 161 } 162 163 FILE * 164 file(name) 165 const char *name; 166 { 167 FILE *fp; 168 169 if (!strcmp(name, "-")) 170 return(stdin); 171 if (!(fp = fopen(name, "r"))) { 172 (void)fprintf(stderr, "comm: can't read %s.\n", name); 173 exit(1); 174 } 175 return(fp); 176 } 177 178 void 179 usage() 180 { 181 (void)fprintf(stderr, "usage: comm [-123] file1 file2\n"); 182 exit(1); 183 } 184