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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved. 37 * @(#)comm.c 8.4 (Berkeley) 5/4/95 38 * $FreeBSD: src/usr.bin/comm/comm.c,v 1.11.2.3 2002/07/11 00:46:37 tjr Exp $ 39 * $DragonFly: src/usr.bin/comm/comm.c,v 1.2 2003/06/17 04:29:25 dillon Exp $ 40 */ 41 42 #include <ctype.h> 43 #include <err.h> 44 #include <limits.h> 45 #include <locale.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #define MAXLINELEN (LINE_MAX + 1) 52 53 const char *tabs[] = { "", "\t", "\t\t" }; 54 55 FILE *file(char *); 56 void show(FILE *, const char *, char *); 57 int stricoll(char *, char *); 58 static void usage(void); 59 60 int 61 main(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 int comp, file1done = 0, file2done = 0, read1, read2; 66 int ch, flag1, flag2, flag3, iflag; 67 FILE *fp1, *fp2; 68 const char *col1, *col2, *col3; 69 char line1[MAXLINELEN], line2[MAXLINELEN]; 70 const char **p; 71 72 flag1 = flag2 = flag3 = 1; 73 iflag = 0; 74 75 (void) setlocale(LC_ALL, ""); 76 77 while ((ch = getopt(argc, argv, "123i")) != -1) 78 switch(ch) { 79 case '1': 80 flag1 = 0; 81 break; 82 case '2': 83 flag2 = 0; 84 break; 85 case '3': 86 flag3 = 0; 87 break; 88 case 'i': 89 iflag = 1; 90 break; 91 case '?': 92 default: 93 usage(); 94 } 95 argc -= optind; 96 argv += optind; 97 98 if (argc != 2) 99 usage(); 100 101 fp1 = file(argv[0]); 102 fp2 = file(argv[1]); 103 104 /* for each column printed, add another tab offset */ 105 p = tabs; 106 col1 = col2 = col3 = NULL; 107 if (flag1) 108 col1 = *p++; 109 if (flag2) 110 col2 = *p++; 111 if (flag3) 112 col3 = *p; 113 114 for (read1 = read2 = 1;;) { 115 /* read next line, check for EOF */ 116 if (read1) 117 file1done = !fgets(line1, MAXLINELEN, fp1); 118 if (read2) 119 file2done = !fgets(line2, MAXLINELEN, fp2); 120 121 /* if one file done, display the rest of the other file */ 122 if (file1done) { 123 if (!file2done && col2) 124 show(fp2, col2, line2); 125 break; 126 } 127 if (file2done) { 128 if (!file1done && col1) 129 show(fp1, col1, line1); 130 break; 131 } 132 133 /* lines are the same */ 134 if(iflag) 135 comp = stricoll(line1, line2); 136 else 137 comp = strcoll(line1, line2); 138 139 if (!comp) { 140 read1 = read2 = 1; 141 if (col3) 142 (void)printf("%s%s", col3, line1); 143 continue; 144 } 145 146 /* lines are different */ 147 if (comp < 0) { 148 read1 = 1; 149 read2 = 0; 150 if (col1) 151 (void)printf("%s%s", col1, line1); 152 } else { 153 read1 = 0; 154 read2 = 1; 155 if (col2) 156 (void)printf("%s%s", col2, line2); 157 } 158 } 159 exit(0); 160 } 161 162 void 163 show(fp, offset, buf) 164 FILE *fp; 165 const char *offset; 166 char *buf; 167 { 168 169 do { 170 (void)printf("%s%s", offset, buf); 171 } while (fgets(buf, MAXLINELEN, fp)); 172 } 173 174 FILE * 175 file(name) 176 char *name; 177 { 178 FILE *fp; 179 180 if (!strcmp(name, "-")) 181 return (stdin); 182 if ((fp = fopen(name, "r")) == NULL) { 183 err(1, "%s", name); 184 } 185 return (fp); 186 } 187 188 static void 189 usage() 190 { 191 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 192 exit(1); 193 } 194 195 int 196 stricoll(s1, s2) 197 char *s1, *s2; 198 { 199 char *p, line1[MAXLINELEN], line2[MAXLINELEN]; 200 201 for (p = line1; *s1; s1++) 202 *p++ = tolower((unsigned char)*s1); 203 *p = '\0'; 204 for (p = line2; *s2; s2++) 205 *p++ = tolower((unsigned char)*s2); 206 *p = '\0'; 207 return strcoll(line1, line2); 208 } 209