1 /* 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Case Larsen. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved. 33 * @(#)comm.c 8.4 (Berkeley) 5/4/95 34 * $FreeBSD: src/usr.bin/comm/comm.c,v 1.11.2.3 2002/07/11 00:46:37 tjr Exp $ 35 * $DragonFly: src/usr.bin/comm/comm.c,v 1.3 2003/10/02 17:42:27 hmp Exp $ 36 */ 37 38 #include <ctype.h> 39 #include <err.h> 40 #include <limits.h> 41 #include <locale.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #define MAXLINELEN (LINE_MAX + 1) 48 49 const char *tabs[] = { "", "\t", "\t\t" }; 50 51 FILE *file(char *); 52 void show(FILE *, const char *, char *); 53 int stricoll(char *, char *); 54 static void usage(void); 55 56 int 57 main(int argc, char **argv) 58 { 59 int comp, file1done = 0, file2done = 0, read1, read2; 60 int ch, flag1, flag2, flag3, iflag; 61 FILE *fp1, *fp2; 62 const char *col1, *col2, *col3; 63 char line1[MAXLINELEN], line2[MAXLINELEN]; 64 const char **p; 65 66 flag1 = flag2 = flag3 = 1; 67 iflag = 0; 68 69 (void) setlocale(LC_ALL, ""); 70 71 while ((ch = getopt(argc, argv, "123i")) != -1) 72 switch(ch) { 73 case '1': 74 flag1 = 0; 75 break; 76 case '2': 77 flag2 = 0; 78 break; 79 case '3': 80 flag3 = 0; 81 break; 82 case 'i': 83 iflag = 1; 84 break; 85 case '?': 86 default: 87 usage(); 88 } 89 argc -= optind; 90 argv += optind; 91 92 if (argc != 2) 93 usage(); 94 95 fp1 = file(argv[0]); 96 fp2 = file(argv[1]); 97 98 /* for each column printed, add another tab offset */ 99 p = tabs; 100 col1 = col2 = col3 = NULL; 101 if (flag1) 102 col1 = *p++; 103 if (flag2) 104 col2 = *p++; 105 if (flag3) 106 col3 = *p; 107 108 for (read1 = read2 = 1;;) { 109 /* read next line, check for EOF */ 110 if (read1) 111 file1done = !fgets(line1, MAXLINELEN, fp1); 112 if (read2) 113 file2done = !fgets(line2, MAXLINELEN, fp2); 114 115 /* if one file done, display the rest of the other file */ 116 if (file1done) { 117 if (!file2done && col2) 118 show(fp2, col2, line2); 119 break; 120 } 121 if (file2done) { 122 if (!file1done && col1) 123 show(fp1, col1, line1); 124 break; 125 } 126 127 /* lines are the same */ 128 if(iflag) 129 comp = stricoll(line1, line2); 130 else 131 comp = strcoll(line1, line2); 132 133 if (!comp) { 134 read1 = read2 = 1; 135 if (col3) 136 (void)printf("%s%s", col3, line1); 137 continue; 138 } 139 140 /* lines are different */ 141 if (comp < 0) { 142 read1 = 1; 143 read2 = 0; 144 if (col1) 145 (void)printf("%s%s", col1, line1); 146 } else { 147 read1 = 0; 148 read2 = 1; 149 if (col2) 150 (void)printf("%s%s", col2, line2); 151 } 152 } 153 exit(0); 154 } 155 156 void 157 show(FILE *fp, const char *offset, char *buf) 158 { 159 160 do { 161 (void)printf("%s%s", offset, buf); 162 } while (fgets(buf, MAXLINELEN, fp)); 163 } 164 165 FILE * 166 file(char *name) 167 { 168 FILE *fp; 169 170 if (!strcmp(name, "-")) 171 return (stdin); 172 if ((fp = fopen(name, "r")) == NULL) { 173 err(1, "%s", name); 174 } 175 return (fp); 176 } 177 178 static void 179 usage(void) 180 { 181 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 182 exit(1); 183 } 184 185 int 186 stricoll(char *s1, char *s2) 187 { 188 char *p, line1[MAXLINELEN], line2[MAXLINELEN]; 189 190 for (p = line1; *s1; s1++) 191 *p++ = tolower((unsigned char)*s1); 192 *p = '\0'; 193 for (p = line2; *s2; s2++) 194 *p++ = tolower((unsigned char)*s2); 195 *p = '\0'; 196 return strcoll(line1, line2); 197 } 198