1 /* $NetBSD: comm.c,v 1.14 2004/07/09 11:50:21 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Case Larsen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)comm.c 8.4 (Berkeley) 5/4/95"; 44 #endif 45 __RCSID("$NetBSD: comm.c,v 1.14 2004/07/09 11:50:21 wiz Exp $"); 46 #endif /* not lint */ 47 48 #include <err.h> 49 #include <limits.h> 50 #include <locale.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #define MAXLINELEN (LINE_MAX + 1) 57 58 char *tabs[] = { "", "\t", "\t\t" }; 59 60 FILE *file __P((const char *)); 61 int main __P((int, char **)); 62 void show __P((FILE *, char *, char *)); 63 void usage __P((void)); 64 65 int 66 main(argc, argv) 67 int argc; 68 char **argv; 69 { 70 int comp, file1done, file2done, read1, read2; 71 int ch, flag1, flag2, flag3; 72 FILE *fp1, *fp2; 73 char *col1, *col2, *col3; 74 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 75 int (*compare)(const char*,const char*); 76 77 (void)setlocale(LC_ALL, ""); 78 79 file1done = file2done = 0; 80 flag1 = flag2 = flag3 = 1; 81 compare = strcoll; 82 while ((ch = getopt(argc, argv, "123f")) != -1) 83 switch(ch) { 84 case '1': 85 flag1 = 0; 86 break; 87 case '2': 88 flag2 = 0; 89 break; 90 case '3': 91 flag3 = 0; 92 break; 93 case 'f': 94 compare = strcasecmp; 95 break; 96 case '?': 97 default: 98 usage(); 99 } 100 argc -= optind; 101 argv += optind; 102 103 if (argc != 2) 104 usage(); 105 106 fp1 = file(argv[0]); 107 fp2 = file(argv[1]); 108 109 /* for each column printed, add another tab offset */ 110 p = tabs; 111 col1 = col2 = col3 = NULL; 112 if (flag1) 113 col1 = *p++; 114 if (flag2) 115 col2 = *p++; 116 if (flag3) 117 col3 = *p; 118 119 for (read1 = read2 = 1;;) { 120 /* read next line, check for EOF */ 121 if (read1) 122 file1done = !fgets(line1, MAXLINELEN, fp1); 123 if (read2) 124 file2done = !fgets(line2, MAXLINELEN, fp2); 125 126 /* if one file done, display the rest of the other file */ 127 if (file1done) { 128 if (!file2done && col2) 129 show(fp2, col2, line2); 130 break; 131 } 132 if (file2done) { 133 if (!file1done && col1) 134 show(fp1, col1, line1); 135 break; 136 } 137 138 /* lines are the same */ 139 if (!(comp = compare(line1, line2))) { 140 read1 = read2 = 1; 141 if (col3) 142 if (printf("%s%s", col3, line1) < 0) 143 break; 144 continue; 145 } 146 147 /* lines are different */ 148 if (comp < 0) { 149 read1 = 1; 150 read2 = 0; 151 if (col1) 152 if (printf("%s%s", col1, line1) < 0) 153 break; 154 } else { 155 read1 = 0; 156 read2 = 1; 157 if (col2) 158 if (printf("%s%s", col2, line2) < 0) 159 break; 160 } 161 } 162 163 if (ferror (stdout) || fclose (stdout) == EOF) 164 err(1, "stdout"); 165 166 exit(0); 167 } 168 169 void 170 show(fp, offset, buf) 171 FILE *fp; 172 char *offset, *buf; 173 { 174 while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp)) 175 ; 176 } 177 178 FILE * 179 file(name) 180 const char *name; 181 { 182 FILE *fp; 183 184 if (!strcmp(name, "-")) 185 return (stdin); 186 if ((fp = fopen(name, "r")) == NULL) 187 err(1, "%s", name); 188 return (fp); 189 } 190 191 void 192 usage() 193 { 194 195 (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n"); 196 exit(1); 197 } 198