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[] = "@(#)comm.c 5.7 (Berkeley) 11/1/90"; 45 #endif /* not lint */ 46 47 #include <sys/file.h> 48 #include <limits.h> 49 #include <stdio.h> 50 51 #define MAXLINELEN (_POSIX2_LINE_MAX + 1) 52 53 char *tabs[] = { "", "\t", "\t\t" }; 54 55 main(argc,argv) 56 int argc; 57 char *argv[]; 58 { 59 register int comp, file1done, file2done, read1, read2; 60 register char *col1, *col2, *col3; 61 int ch, flag1, flag2, flag3; 62 FILE *fp1, *fp2, *file(); 63 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 64 extern int optind; 65 66 flag1 = flag2 = flag3 = 1; 67 while ((ch = getopt(argc, argv, "-123")) != EOF) 68 switch(ch) { 69 case '-': 70 --optind; 71 goto done; 72 case '1': 73 flag1 = 0; 74 break; 75 case '2': 76 flag2 = 0; 77 break; 78 case '3': 79 flag3 = 0; 80 break; 81 case '?': 82 default: 83 usage(); 84 } 85 done: argc -= optind; 86 argv += optind; 87 88 if (argc != 2) 89 usage(); 90 91 fp1 = file(argv[0]); 92 fp2 = file(argv[1]); 93 94 /* for each column printed, add another tab offset */ 95 p = tabs; 96 col1 = col2 = col3 = NULL; 97 if (flag1) 98 col1 = *p++; 99 if (flag2) 100 col2 = *p++; 101 if (flag3) 102 col3 = *p; 103 104 for (read1 = read2 = 1;;) { 105 /* read next line, check for EOF */ 106 if (read1) 107 file1done = !fgets(line1, MAXLINELEN, fp1); 108 if (read2) 109 file2done = !fgets(line2, MAXLINELEN, fp2); 110 111 /* if one file done, display the rest of the other file */ 112 if (file1done) { 113 if (!file2done && col2) 114 show(fp2, col2, line2); 115 break; 116 } 117 if (file2done) { 118 if (!file1done && col1) 119 show(fp1, col1, line1); 120 break; 121 } 122 123 /* lines are the same */ 124 if (!(comp = strcmp(line1, line2))) { 125 read1 = read2 = 1; 126 if (col3) 127 (void)printf("%s%s", col3, line1); 128 continue; 129 } 130 131 /* lines are different */ 132 if (comp < 0) { 133 read1 = 1; 134 read2 = 0; 135 if (col1) 136 (void)printf("%s%s", col1, line1); 137 } else { 138 read1 = 0; 139 read2 = 1; 140 if (col2) 141 (void)printf("%s%s", col2, line2); 142 } 143 } 144 exit(0); 145 } 146 147 show(fp, offset, buf) 148 FILE *fp; 149 char *offset, *buf; 150 { 151 do { 152 (void)printf("%s%s", offset, buf); 153 } while (fgets(buf, MAXLINELEN, fp)); 154 } 155 156 FILE * 157 file(name) 158 char *name; 159 { 160 FILE *fp; 161 162 if (!strcmp(name, "-")) 163 return(stdin); 164 if (!(fp = fopen(name, "r"))) { 165 (void)fprintf(stderr, "comm: can't read %s.\n", name); 166 exit(1); 167 } 168 return(fp); 169 } 170 171 usage() 172 { 173 (void)fprintf(stderr, "usage: comm [-123] [ - ] file1 file2\n"); 174 exit(1); 175 } 176