1 /* $OpenBSD: comm.c,v 1.11 2022/12/04 23:50:47 cheloha 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 default: 84 usage(); 85 } 86 argc -= optind; 87 argv += optind; 88 89 if (argc != 2) 90 usage(); 91 92 fp1 = file(argv[0]); 93 fp2 = file(argv[1]); 94 95 /* for each column printed, add another tab offset */ 96 p = tabs; 97 col1 = col2 = col3 = NULL; 98 if (flag1) 99 col1 = *p++; 100 if (flag2) 101 col2 = *p++; 102 if (flag3) 103 col3 = *p; 104 105 for (read1 = read2 = 1;;) { 106 /* read next line, check for EOF */ 107 if (read1) 108 file1done = !fgets(line1, MAXLINELEN, fp1); 109 if (read2) 110 file2done = !fgets(line2, MAXLINELEN, fp2); 111 112 /* if one file done, display the rest of the other file */ 113 if (file1done) { 114 if (!file2done && col2) 115 show(fp2, col2, line2); 116 break; 117 } 118 if (file2done) { 119 if (!file1done && col1) 120 show(fp1, col1, line1); 121 break; 122 } 123 124 /* lines are the same */ 125 if (!(comp = compare(line1, line2))) { 126 read1 = read2 = 1; 127 if (col3) 128 if (printf("%s%s", col3, line1) < 0) 129 break; 130 continue; 131 } 132 133 /* lines are different */ 134 if (comp < 0) { 135 read1 = 1; 136 read2 = 0; 137 if (col1) 138 if (printf("%s%s", col1, line1) < 0) 139 break; 140 } else { 141 read1 = 0; 142 read2 = 1; 143 if (col2) 144 if (printf("%s%s", col2, line2) < 0) 145 break; 146 } 147 } 148 149 if (ferror (stdout) || fclose (stdout) == EOF) 150 err(1, "stdout"); 151 152 exit(0); 153 } 154 155 void 156 show(FILE *fp, char *offset, char *buf) 157 { 158 while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp)) 159 ; 160 } 161 162 FILE * 163 file(const char *name) 164 { 165 FILE *fp; 166 167 if (!strcmp(name, "-")) 168 return (stdin); 169 if ((fp = fopen(name, "r")) == NULL) 170 err(1, "%s", name); 171 return (fp); 172 } 173 174 void 175 usage(void) 176 { 177 (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n"); 178 exit(1); 179 } 180