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 37 #ifndef lint 38 static const char copyright[] = 39 "@(#) Copyright (c) 1989, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif 42 43 #if 0 44 #ifndef lint 45 static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95"; 46 #endif 47 #endif 48 49 #include <sys/cdefs.h> 50 __FBSDID("$FreeBSD$"); 51 52 #include <ctype.h> 53 #include <err.h> 54 #include <limits.h> 55 #include <locale.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #define MAXLINELEN (LINE_MAX + 1) 62 63 const char *tabs[] = { "", "\t", "\t\t" }; 64 65 FILE *file(const char *); 66 void show(FILE *, const char *, char *); 67 int stricoll(const char *, const char *); 68 static void usage(void); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 int comp, file1done = 0, file2done = 0, read1, read2; 74 int ch, flag1, flag2, flag3, iflag; 75 FILE *fp1, *fp2; 76 const char *col1, *col2, *col3; 77 char line1[MAXLINELEN], line2[MAXLINELEN]; 78 const char **p; 79 80 flag1 = flag2 = flag3 = 1; 81 iflag = 0; 82 83 (void) setlocale(LC_ALL, ""); 84 85 while ((ch = getopt(argc, argv, "123i")) != -1) 86 switch(ch) { 87 case '1': 88 flag1 = 0; 89 break; 90 case '2': 91 flag2 = 0; 92 break; 93 case '3': 94 flag3 = 0; 95 break; 96 case 'i': 97 iflag = 1; 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (argc != 2) 107 usage(); 108 109 fp1 = file(argv[0]); 110 fp2 = file(argv[1]); 111 112 /* for each column printed, add another tab offset */ 113 p = tabs; 114 col1 = col2 = col3 = NULL; 115 if (flag1) 116 col1 = *p++; 117 if (flag2) 118 col2 = *p++; 119 if (flag3) 120 col3 = *p; 121 122 for (read1 = read2 = 1;;) { 123 /* read next line, check for EOF */ 124 if (read1) 125 file1done = !fgets(line1, MAXLINELEN, fp1); 126 if (read2) 127 file2done = !fgets(line2, MAXLINELEN, fp2); 128 129 /* if one file done, display the rest of the other file */ 130 if (file1done) { 131 if (!file2done && col2) 132 show(fp2, col2, line2); 133 break; 134 } 135 if (file2done) { 136 if (!file1done && col1) 137 show(fp1, col1, line1); 138 break; 139 } 140 141 /* lines are the same */ 142 if(iflag) 143 comp = stricoll(line1, line2); 144 else 145 comp = strcoll(line1, line2); 146 147 if (!comp) { 148 read1 = read2 = 1; 149 if (col3) 150 (void)printf("%s%s", col3, line1); 151 continue; 152 } 153 154 /* lines are different */ 155 if (comp < 0) { 156 read1 = 1; 157 read2 = 0; 158 if (col1) 159 (void)printf("%s%s", col1, line1); 160 } else { 161 read1 = 0; 162 read2 = 1; 163 if (col2) 164 (void)printf("%s%s", col2, line2); 165 } 166 } 167 exit(0); 168 } 169 170 void 171 show(FILE *fp, const char *offset, char *buf) 172 { 173 174 do { 175 (void)printf("%s%s", offset, buf); 176 } while (fgets(buf, MAXLINELEN, fp)); 177 } 178 179 FILE * 180 file(const char *name) 181 { 182 FILE *fp; 183 184 if (!strcmp(name, "-")) 185 return (stdin); 186 if ((fp = fopen(name, "r")) == NULL) { 187 err(1, "%s", name); 188 } 189 return (fp); 190 } 191 192 static void 193 usage(void) 194 { 195 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 196 exit(1); 197 } 198 199 int 200 stricoll(const char *s1, const char *s2) 201 { 202 char *p, line1[MAXLINELEN], line2[MAXLINELEN]; 203 204 for (p = line1; *s1; s1++) 205 *p++ = tolower((unsigned char)*s1); 206 *p = '\0'; 207 for (p = line2; *s2; s2++) 208 *p++ = tolower((unsigned char)*s2); 209 *p = '\0'; 210 return strcoll(line1, line2); 211 } 212