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 1.3 2003/10/02 17:42:27 hmp 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(int argc, char **argv) 62 { 63 int comp, file1done = 0, file2done = 0, read1, read2; 64 int ch, flag1, flag2, flag3, iflag; 65 FILE *fp1, *fp2; 66 const char *col1, *col2, *col3; 67 char line1[MAXLINELEN], line2[MAXLINELEN]; 68 const char **p; 69 70 flag1 = flag2 = flag3 = 1; 71 iflag = 0; 72 73 (void) setlocale(LC_ALL, ""); 74 75 while ((ch = getopt(argc, argv, "123i")) != -1) 76 switch(ch) { 77 case '1': 78 flag1 = 0; 79 break; 80 case '2': 81 flag2 = 0; 82 break; 83 case '3': 84 flag3 = 0; 85 break; 86 case 'i': 87 iflag = 1; 88 break; 89 case '?': 90 default: 91 usage(); 92 } 93 argc -= optind; 94 argv += optind; 95 96 if (argc != 2) 97 usage(); 98 99 fp1 = file(argv[0]); 100 fp2 = file(argv[1]); 101 102 /* for each column printed, add another tab offset */ 103 p = tabs; 104 col1 = col2 = col3 = NULL; 105 if (flag1) 106 col1 = *p++; 107 if (flag2) 108 col2 = *p++; 109 if (flag3) 110 col3 = *p; 111 112 for (read1 = read2 = 1;;) { 113 /* read next line, check for EOF */ 114 if (read1) 115 file1done = !fgets(line1, MAXLINELEN, fp1); 116 if (read2) 117 file2done = !fgets(line2, MAXLINELEN, fp2); 118 119 /* if one file done, display the rest of the other file */ 120 if (file1done) { 121 if (!file2done && col2) 122 show(fp2, col2, line2); 123 break; 124 } 125 if (file2done) { 126 if (!file1done && col1) 127 show(fp1, col1, line1); 128 break; 129 } 130 131 /* lines are the same */ 132 if(iflag) 133 comp = stricoll(line1, line2); 134 else 135 comp = strcoll(line1, line2); 136 137 if (!comp) { 138 read1 = read2 = 1; 139 if (col3) 140 (void)printf("%s%s", col3, line1); 141 continue; 142 } 143 144 /* lines are different */ 145 if (comp < 0) { 146 read1 = 1; 147 read2 = 0; 148 if (col1) 149 (void)printf("%s%s", col1, line1); 150 } else { 151 read1 = 0; 152 read2 = 1; 153 if (col2) 154 (void)printf("%s%s", col2, line2); 155 } 156 } 157 exit(0); 158 } 159 160 void 161 show(FILE *fp, const char *offset, char *buf) 162 { 163 164 do { 165 (void)printf("%s%s", offset, buf); 166 } while (fgets(buf, MAXLINELEN, fp)); 167 } 168 169 FILE * 170 file(char *name) 171 { 172 FILE *fp; 173 174 if (!strcmp(name, "-")) 175 return (stdin); 176 if ((fp = fopen(name, "r")) == NULL) { 177 err(1, "%s", name); 178 } 179 return (fp); 180 } 181 182 static void 183 usage(void) 184 { 185 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 186 exit(1); 187 } 188 189 int 190 stricoll(char *s1, char *s2) 191 { 192 char *p, line1[MAXLINELEN], line2[MAXLINELEN]; 193 194 for (p = line1; *s1; s1++) 195 *p++ = tolower((unsigned char)*s1); 196 *p = '\0'; 197 for (p = line2; *s2; s2++) 198 *p++ = tolower((unsigned char)*s2); 199 *p = '\0'; 200 return strcoll(line1, line2); 201 } 202