1 /* $NetBSD: comm.c,v 1.8 1995/03/27 15:54:30 glass 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #ifndef lint 40 static char copyright[] = 41 "@(#) Copyright (c) 1989, 1993, 1994\n\ 42 The Regents of the University of California. All rights reserved.\n"; 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)comm.c 8.3 (Berkeley) 4/2/94"; 48 #else 49 static char rcsid[] = "$NetBSD: comm.c,v 1.8 1995/03/27 15:54:30 glass Exp $"; 50 #endif 51 #endif /* not lint */ 52 53 #include <err.h> 54 #include <limits.h> 55 #include <locale.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #define MAXLINELEN (LINE_MAX + 1) 62 63 char *tabs[] = { "", "\t", "\t\t" }; 64 65 FILE *file __P((const char *)); 66 void show __P((FILE *, char *, char *)); 67 void usage __P((void)); 68 69 int 70 main(argc, argv) 71 int argc; 72 char **argv; 73 { 74 int comp, file1done, file2done, read1, read2; 75 int ch, flag1, flag2, flag3; 76 FILE *fp1, *fp2; 77 char *col1, *col2, *col3; 78 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 79 80 setlocale(LC_ALL, ""); 81 82 flag1 = flag2 = flag3 = 1; 83 while ((ch = getopt(argc, argv, "123")) != -1) 84 switch(ch) { 85 case '1': 86 flag1 = 0; 87 break; 88 case '2': 89 flag2 = 0; 90 break; 91 case '3': 92 flag3 = 0; 93 break; 94 case '?': 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if (argc != 2) 102 usage(); 103 104 fp1 = file(argv[0]); 105 fp2 = file(argv[1]); 106 107 /* for each column printed, add another tab offset */ 108 p = tabs; 109 col1 = col2 = col3 = NULL; 110 if (flag1) 111 col1 = *p++; 112 if (flag2) 113 col2 = *p++; 114 if (flag3) 115 col3 = *p; 116 117 for (read1 = read2 = 1;;) { 118 /* read next line, check for EOF */ 119 if (read1) 120 file1done = !fgets(line1, MAXLINELEN, fp1); 121 if (read2) 122 file2done = !fgets(line2, MAXLINELEN, fp2); 123 124 /* if one file done, display the rest of the other file */ 125 if (file1done) { 126 if (!file2done && col2) 127 show(fp2, col2, line2); 128 break; 129 } 130 if (file2done) { 131 if (!file1done && col1) 132 show(fp1, col1, line1); 133 break; 134 } 135 136 /* lines are the same */ 137 if (!(comp = strcoll(line1, line2))) { 138 read1 = read2 = 1; 139 if (col3) 140 if (printf("%s%s", col3, line1) < 0) 141 break; 142 continue; 143 } 144 145 /* lines are different */ 146 if (comp < 0) { 147 read1 = 1; 148 read2 = 0; 149 if (col1) 150 if (printf("%s%s", col1, line1) < 0) 151 break; 152 } else { 153 read1 = 0; 154 read2 = 1; 155 if (col2) 156 if (printf("%s%s", col2, line2) < 0) 157 break; 158 } 159 } 160 161 if (ferror (stdout) || fclose (stdout) == EOF) 162 err(1, "stdout"); 163 164 exit(0); 165 } 166 167 void 168 show(fp, offset, buf) 169 FILE *fp; 170 char *offset, *buf; 171 { 172 while (printf("%s%s", offset, buf) < 0 && fgets(buf, MAXLINELEN, fp)) 173 ; 174 } 175 176 FILE * 177 file(name) 178 const char *name; 179 { 180 FILE *fp; 181 182 if (!strcmp(name, "-")) 183 return (stdin); 184 if ((fp = fopen(name, "r")) == NULL) 185 err(1, "%s", name); 186 return (fp); 187 } 188 189 void 190 usage() 191 { 192 193 (void)fprintf(stderr, "usage: comm [-123] file1 file2\n"); 194 exit(1); 195 } 196