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 1.5 1994/11/08 18:37:10 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 #include <unistd.h> 54 #include <err.h> 55 56 #define MAXLINELEN (_POSIX2_LINE_MAX + 1) 57 58 char *tabs[] = { "", "\t", "\t\t" }; 59 60 FILE *file __P((const char *)); 61 void show __P((FILE *, char *, char *)); 62 void usage __P((void)); 63 64 int 65 main(argc,argv) 66 int argc; 67 char **argv; 68 { 69 register int comp, file1done, file2done, read1, read2; 70 register char *col1, *col2, *col3; 71 int ch, flag1, flag2, flag3; 72 FILE *fp1, *fp2; 73 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 74 75 setlocale(LC_ALL, ""); 76 77 flag1 = flag2 = flag3 = 1; 78 while ((ch = getopt(argc, argv, "123")) != -1) 79 switch(ch) { 80 case '1': 81 flag1 = 0; 82 break; 83 case '2': 84 flag2 = 0; 85 break; 86 case '3': 87 flag3 = 0; 88 break; 89 case '?': 90 default: 91 usage(); 92 } 93 argc -= optind; 94 argv += optind; 95 96 if (argc != 2) 97 usage(); 98 99 fp1 = file(argv[0]); 100 fp2 = file(argv[1]); 101 102 /* for each column printed, add another tab offset */ 103 p = tabs; 104 col1 = col2 = col3 = NULL; 105 if (flag1) 106 col1 = *p++; 107 if (flag2) 108 col2 = *p++; 109 if (flag3) 110 col3 = *p; 111 112 for (read1 = read2 = 1;;) { 113 /* read next line, check for EOF */ 114 if (read1) 115 file1done = !fgets(line1, MAXLINELEN, fp1); 116 if (read2) 117 file2done = !fgets(line2, MAXLINELEN, fp2); 118 119 /* if one file done, display the rest of the other file */ 120 if (file1done) { 121 if (!file2done && col2) 122 show(fp2, col2, line2); 123 break; 124 } 125 if (file2done) { 126 if (!file1done && col1) 127 show(fp1, col1, line1); 128 break; 129 } 130 131 /* lines are the same */ 132 if (!(comp = strcoll(line1, line2))) { 133 read1 = read2 = 1; 134 if (col3) 135 if (printf("%s%s", col3, line1) == EOF) 136 break; 137 continue; 138 } 139 140 /* lines are different */ 141 if (comp < 0) { 142 read1 = 1; 143 read2 = 0; 144 if (col1) 145 if (printf("%s%s", col1, line1) == EOF) 146 break; 147 } else { 148 read1 = 0; 149 read2 = 1; 150 if (col2) 151 if (printf("%s%s", col2, line2) == EOF) 152 break; 153 } 154 } 155 156 if (ferror (stdout) || fclose (stdout) == EOF) 157 err(1, "stdout"); 158 159 exit(0); 160 } 161 162 void 163 show(fp, offset, buf) 164 FILE *fp; 165 char *offset, *buf; 166 { 167 while (printf("%s%s", offset, buf) != EOF && fgets(buf, MAXLINELEN, fp)) 168 ; 169 } 170 171 FILE * 172 file(name) 173 const char *name; 174 { 175 FILE *fp; 176 177 if (!strcmp(name, "-")) 178 return(stdin); 179 if (!(fp = fopen(name, "r"))) { 180 (void)fprintf(stderr, "comm: can't read %s.\n", name); 181 exit(1); 182 } 183 return(fp); 184 } 185 186 void 187 usage() 188 { 189 (void)fprintf(stderr, "usage: comm [-123] file1 file2\n"); 190 exit(1); 191 } 192