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 /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95"; 46 #endif 47 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <limits.h> 54 #include <locale.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #define MAXLINELEN (LINE_MAX + 1) 61 62 char *tabs[] = { "", "\t", "\t\t" }; 63 64 FILE *file __P((char *)); 65 void show __P((FILE *, char *, char *)); 66 int stricoll __P((char *, char *)); 67 static void usage __P((void)); 68 69 int 70 main(argc, argv) 71 int argc; 72 char *argv[]; 73 { 74 int comp, file1done = 0, file2done = 0, read1, read2; 75 int ch, flag1, flag2, flag3, iflag; 76 FILE *fp1, *fp2; 77 char *col1, *col2, *col3; 78 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 79 80 flag1 = flag2 = flag3 = 1; 81 iflag = 0; 82 83 (void) setlocale(LC_CTYPE, ""); 84 85 while ((ch = getopt(argc, argv, "-123i")) != -1) 86 switch(ch) { 87 case '-': 88 --optind; 89 goto done; 90 case '1': 91 flag1 = 0; 92 break; 93 case '2': 94 flag2 = 0; 95 break; 96 case '3': 97 flag3 = 0; 98 break; 99 case 'i': 100 iflag = 1; 101 break; 102 case '?': 103 default: 104 usage(); 105 } 106 done: argc -= optind; 107 argv += optind; 108 109 if (argc != 2) 110 usage(); 111 112 fp1 = file(argv[0]); 113 fp2 = file(argv[1]); 114 115 /* for each column printed, add another tab offset */ 116 p = tabs; 117 col1 = col2 = col3 = NULL; 118 if (flag1) 119 col1 = *p++; 120 if (flag2) 121 col2 = *p++; 122 if (flag3) 123 col3 = *p; 124 125 for (read1 = read2 = 1;;) { 126 /* read next line, check for EOF */ 127 if (read1) 128 file1done = !fgets(line1, MAXLINELEN, fp1); 129 if (read2) 130 file2done = !fgets(line2, MAXLINELEN, fp2); 131 132 /* if one file done, display the rest of the other file */ 133 if (file1done) { 134 if (!file2done && col2) 135 show(fp2, col2, line2); 136 break; 137 } 138 if (file2done) { 139 if (!file1done && col1) 140 show(fp1, col1, line1); 141 break; 142 } 143 144 /* lines are the same */ 145 if(iflag) 146 comp = stricoll(line1, line2); 147 else 148 comp = strcoll(line1, line2); 149 150 if (!comp) { 151 read1 = read2 = 1; 152 if (col3) 153 (void)printf("%s%s", col3, line1); 154 continue; 155 } 156 157 /* lines are different */ 158 if (comp < 0) { 159 read1 = 1; 160 read2 = 0; 161 if (col1) 162 (void)printf("%s%s", col1, line1); 163 } else { 164 read1 = 0; 165 read2 = 1; 166 if (col2) 167 (void)printf("%s%s", col2, line2); 168 } 169 } 170 exit(0); 171 } 172 173 void 174 show(fp, offset, buf) 175 FILE *fp; 176 char *offset, *buf; 177 { 178 179 do { 180 (void)printf("%s%s", offset, buf); 181 } while (fgets(buf, MAXLINELEN, fp)); 182 } 183 184 FILE * 185 file(name) 186 char *name; 187 { 188 FILE *fp; 189 190 if (!strcmp(name, "-")) 191 return (stdin); 192 if ((fp = fopen(name, "r")) == NULL) { 193 err(1, "%s", name); 194 } 195 return (fp); 196 } 197 198 static void 199 usage() 200 { 201 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 202 exit(1); 203 } 204 205 int 206 stricoll(s1, s2) 207 char *s1, *s2; 208 { 209 char *p, line1[MAXLINELEN], line2[MAXLINELEN]; 210 211 for (p = line1; *s1; s1++) 212 *p++ = tolower((unsigned char)*s1); 213 *p = '\0'; 214 for (p = line2; *s2; s2++) 215 *p++ = tolower((unsigned char)*s2); 216 *p = '\0'; 217 return strcoll(line1, line2); 218 } 219