1 /* 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. 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 static const char copyright[] = 39 "@(#) Copyright (c) 1989, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95"; 46 #endif 47 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 50 51 #include <err.h> 52 #include <errno.h> 53 #include <limits.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #define MAXLINELEN (LINE_MAX + 1) 60 61 char *tabs[] = { "", "\t", "\t\t" }; 62 63 FILE *file __P((char *)); 64 void show __P((FILE *, char *, char *)); 65 static void usage __P((void)); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 int comp, file1done = 0, file2done = 0, read1, read2; 73 int ch, flag1, flag2, flag3, iflag; 74 FILE *fp1, *fp2; 75 char *col1, *col2, *col3; 76 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 77 78 flag1 = flag2 = flag3 = 1; 79 iflag = 0; 80 81 while ((ch = getopt(argc, argv, "-123i")) != -1) 82 switch(ch) { 83 case '-': 84 --optind; 85 goto done; 86 case '1': 87 flag1 = 0; 88 break; 89 case '2': 90 flag2 = 0; 91 break; 92 case '3': 93 flag3 = 0; 94 break; 95 case 'i': 96 iflag = 1; 97 break; 98 case '?': 99 default: 100 usage(); 101 } 102 done: argc -= optind; 103 argv += optind; 104 105 if (argc != 2) 106 usage(); 107 108 fp1 = file(argv[0]); 109 fp2 = file(argv[1]); 110 111 /* for each column printed, add another tab offset */ 112 p = tabs; 113 col1 = col2 = col3 = NULL; 114 if (flag1) 115 col1 = *p++; 116 if (flag2) 117 col2 = *p++; 118 if (flag3) 119 col3 = *p; 120 121 for (read1 = read2 = 1;;) { 122 /* read next line, check for EOF */ 123 if (read1) 124 file1done = !fgets(line1, MAXLINELEN, fp1); 125 if (read2) 126 file2done = !fgets(line2, MAXLINELEN, fp2); 127 128 /* if one file done, display the rest of the other file */ 129 if (file1done) { 130 if (!file2done && col2) 131 show(fp2, col2, line2); 132 break; 133 } 134 if (file2done) { 135 if (!file1done && col1) 136 show(fp1, col1, line1); 137 break; 138 } 139 140 /* lines are the same */ 141 if(iflag) 142 comp = strcasecmp(line1, line2); 143 else 144 comp = strcmp(line1, line2); 145 146 if (!comp) { 147 read1 = read2 = 1; 148 if (col3) 149 (void)printf("%s%s", col3, line1); 150 continue; 151 } 152 153 /* lines are different */ 154 if (comp < 0) { 155 read1 = 1; 156 read2 = 0; 157 if (col1) 158 (void)printf("%s%s", col1, line1); 159 } else { 160 read1 = 0; 161 read2 = 1; 162 if (col2) 163 (void)printf("%s%s", col2, line2); 164 } 165 } 166 exit(0); 167 } 168 169 void 170 show(fp, offset, buf) 171 FILE *fp; 172 char *offset, *buf; 173 { 174 175 do { 176 (void)printf("%s%s", offset, buf); 177 } while (fgets(buf, MAXLINELEN, fp)); 178 } 179 180 FILE * 181 file(name) 182 char *name; 183 { 184 FILE *fp; 185 186 if (!strcmp(name, "-")) 187 return (stdin); 188 if ((fp = fopen(name, "r")) == NULL) { 189 err(1, "%s", name); 190 } 191 return (fp); 192 } 193 194 static void 195 usage() 196 { 197 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 198 exit(1); 199 } 200