1 /* $NetBSD: comm.c,v 1.10 1995/09/05 19:57:43 jtc 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 8.4 (Berkeley) 5/4/95"; 48 #endif 49 static char rcsid[] = "$NetBSD: comm.c,v 1.10 1995/09/05 19:57:43 jtc Exp $"; 50 #endif /* not lint */ 51 52 #include <err.h> 53 #include <limits.h> 54 #include <locale.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #define MAXLINELEN (LINE_MAX + 1) 61 62 char *tabs[] = { "", "\t", "\t\t" }; 63 64 FILE *file __P((const char *)); 65 void show __P((FILE *, char *, char *)); 66 void usage __P((void)); 67 68 int 69 main(argc, argv) 70 int argc; 71 char **argv; 72 { 73 int comp, file1done, file2done, read1, read2; 74 int ch, flag1, flag2, flag3; 75 FILE *fp1, *fp2; 76 char *col1, *col2, *col3; 77 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 78 79 setlocale(LC_ALL, ""); 80 81 flag1 = flag2 = flag3 = 1; 82 while ((ch = getopt(argc, argv, "123")) != -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 '?': 94 default: 95 usage(); 96 } 97 argc -= optind; 98 argv += optind; 99 100 if (argc != 2) 101 usage(); 102 103 fp1 = file(argv[0]); 104 fp2 = file(argv[1]); 105 106 /* for each column printed, add another tab offset */ 107 p = tabs; 108 col1 = col2 = col3 = NULL; 109 if (flag1) 110 col1 = *p++; 111 if (flag2) 112 col2 = *p++; 113 if (flag3) 114 col3 = *p; 115 116 for (read1 = read2 = 1;;) { 117 /* read next line, check for EOF */ 118 if (read1) 119 file1done = !fgets(line1, MAXLINELEN, fp1); 120 if (read2) 121 file2done = !fgets(line2, MAXLINELEN, fp2); 122 123 /* if one file done, display the rest of the other file */ 124 if (file1done) { 125 if (!file2done && col2) 126 show(fp2, col2, line2); 127 break; 128 } 129 if (file2done) { 130 if (!file1done && col1) 131 show(fp1, col1, line1); 132 break; 133 } 134 135 /* lines are the same */ 136 if (!(comp = strcoll(line1, line2))) { 137 read1 = read2 = 1; 138 if (col3) 139 if (printf("%s%s", col3, line1) < 0) 140 break; 141 continue; 142 } 143 144 /* lines are different */ 145 if (comp < 0) { 146 read1 = 1; 147 read2 = 0; 148 if (col1) 149 if (printf("%s%s", col1, line1) < 0) 150 break; 151 } else { 152 read1 = 0; 153 read2 = 1; 154 if (col2) 155 if (printf("%s%s", col2, line2) < 0) 156 break; 157 } 158 } 159 160 if (ferror (stdout) || fclose (stdout) == EOF) 161 err(1, "stdout"); 162 163 exit(0); 164 } 165 166 void 167 show(fp, offset, buf) 168 FILE *fp; 169 char *offset, *buf; 170 { 171 while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp)) 172 ; 173 } 174 175 FILE * 176 file(name) 177 const char *name; 178 { 179 FILE *fp; 180 181 if (!strcmp(name, "-")) 182 return (stdin); 183 if ((fp = fopen(name, "r")) == NULL) 184 err(1, "%s", name); 185 return (fp); 186 } 187 188 void 189 usage() 190 { 191 192 (void)fprintf(stderr, "usage: comm [-123] file1 file2\n"); 193 exit(1); 194 } 195