1 /* $OpenBSD: comm.c,v 1.10 2015/10/09 01:37:07 deraadt Exp $ */ 2 /* $NetBSD: comm.c,v 1.10 1995/09/05 19:57:43 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Case Larsen. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <err.h> 37 #include <limits.h> 38 #include <locale.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #define MAXLINELEN (LINE_MAX + 1) 45 46 char *tabs[] = { "", "\t", "\t\t" }; 47 48 FILE *file(const char *); 49 void show(FILE *, char *, char *); 50 void usage(void); 51 52 int 53 main(int argc, char *argv[]) 54 { 55 int comp, file1done, file2done, read1, read2; 56 int ch, flag1, flag2, flag3; 57 FILE *fp1, *fp2; 58 char *col1, *col2, *col3; 59 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 60 int (*compare)(const char * ,const char *); 61 62 setlocale(LC_ALL, ""); 63 64 if (pledge("stdio rpath", NULL) == -1) 65 err(1, "pledge"); 66 67 flag1 = flag2 = flag3 = 1; 68 compare = strcoll; 69 while ((ch = getopt(argc, argv, "123f")) != -1) 70 switch(ch) { 71 case '1': 72 flag1 = 0; 73 break; 74 case '2': 75 flag2 = 0; 76 break; 77 case '3': 78 flag3 = 0; 79 break; 80 case 'f': 81 compare = strcasecmp; 82 break; 83 case '?': 84 default: 85 usage(); 86 } 87 argc -= optind; 88 argv += optind; 89 90 if (argc != 2) 91 usage(); 92 93 fp1 = file(argv[0]); 94 fp2 = file(argv[1]); 95 96 /* for each column printed, add another tab offset */ 97 p = tabs; 98 col1 = col2 = col3 = NULL; 99 if (flag1) 100 col1 = *p++; 101 if (flag2) 102 col2 = *p++; 103 if (flag3) 104 col3 = *p; 105 106 for (read1 = read2 = 1;;) { 107 /* read next line, check for EOF */ 108 if (read1) 109 file1done = !fgets(line1, MAXLINELEN, fp1); 110 if (read2) 111 file2done = !fgets(line2, MAXLINELEN, fp2); 112 113 /* if one file done, display the rest of the other file */ 114 if (file1done) { 115 if (!file2done && col2) 116 show(fp2, col2, line2); 117 break; 118 } 119 if (file2done) { 120 if (!file1done && col1) 121 show(fp1, col1, line1); 122 break; 123 } 124 125 /* lines are the same */ 126 if (!(comp = compare(line1, line2))) { 127 read1 = read2 = 1; 128 if (col3) 129 if (printf("%s%s", col3, line1) < 0) 130 break; 131 continue; 132 } 133 134 /* lines are different */ 135 if (comp < 0) { 136 read1 = 1; 137 read2 = 0; 138 if (col1) 139 if (printf("%s%s", col1, line1) < 0) 140 break; 141 } else { 142 read1 = 0; 143 read2 = 1; 144 if (col2) 145 if (printf("%s%s", col2, line2) < 0) 146 break; 147 } 148 } 149 150 if (ferror (stdout) || fclose (stdout) == EOF) 151 err(1, "stdout"); 152 153 exit(0); 154 } 155 156 void 157 show(FILE *fp, char *offset, char *buf) 158 { 159 while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp)) 160 ; 161 } 162 163 FILE * 164 file(const char *name) 165 { 166 FILE *fp; 167 168 if (!strcmp(name, "-")) 169 return (stdin); 170 if ((fp = fopen(name, "r")) == NULL) 171 err(1, "%s", name); 172 return (fp); 173 } 174 175 void 176 usage(void) 177 { 178 (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n"); 179 exit(1); 180 } 181