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 <errno.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 char *tabs[] = { "", "\t", "\t\t" }; 64 65 FILE *file __P((char *)); 66 void show __P((FILE *, char *, char *)); 67 int stricoll __P((char *, char *)); 68 static void usage __P((void)); 69 70 int 71 main(argc, argv) 72 int argc; 73 char *argv[]; 74 { 75 int comp, file1done = 0, file2done = 0, read1, read2; 76 int ch, flag1, flag2, flag3, iflag; 77 FILE *fp1, *fp2; 78 char *col1, *col2, *col3; 79 char **p, line1[MAXLINELEN], line2[MAXLINELEN]; 80 81 flag1 = flag2 = flag3 = 1; 82 iflag = 0; 83 84 (void) setlocale(LC_CTYPE, ""); 85 86 while ((ch = getopt(argc, argv, "-123i")) != -1) 87 switch(ch) { 88 case '-': 89 --optind; 90 goto done; 91 case '1': 92 flag1 = 0; 93 break; 94 case '2': 95 flag2 = 0; 96 break; 97 case '3': 98 flag3 = 0; 99 break; 100 case 'i': 101 iflag = 1; 102 break; 103 case '?': 104 default: 105 usage(); 106 } 107 done: argc -= optind; 108 argv += optind; 109 110 if (argc != 2) 111 usage(); 112 113 fp1 = file(argv[0]); 114 fp2 = file(argv[1]); 115 116 /* for each column printed, add another tab offset */ 117 p = tabs; 118 col1 = col2 = col3 = NULL; 119 if (flag1) 120 col1 = *p++; 121 if (flag2) 122 col2 = *p++; 123 if (flag3) 124 col3 = *p; 125 126 for (read1 = read2 = 1;;) { 127 /* read next line, check for EOF */ 128 if (read1) 129 file1done = !fgets(line1, MAXLINELEN, fp1); 130 if (read2) 131 file2done = !fgets(line2, MAXLINELEN, fp2); 132 133 /* if one file done, display the rest of the other file */ 134 if (file1done) { 135 if (!file2done && col2) 136 show(fp2, col2, line2); 137 break; 138 } 139 if (file2done) { 140 if (!file1done && col1) 141 show(fp1, col1, line1); 142 break; 143 } 144 145 /* lines are the same */ 146 if(iflag) 147 comp = stricoll(line1, line2); 148 else 149 comp = strcoll(line1, line2); 150 151 if (!comp) { 152 read1 = read2 = 1; 153 if (col3) 154 (void)printf("%s%s", col3, line1); 155 continue; 156 } 157 158 /* lines are different */ 159 if (comp < 0) { 160 read1 = 1; 161 read2 = 0; 162 if (col1) 163 (void)printf("%s%s", col1, line1); 164 } else { 165 read1 = 0; 166 read2 = 1; 167 if (col2) 168 (void)printf("%s%s", col2, line2); 169 } 170 } 171 exit(0); 172 } 173 174 void 175 show(fp, offset, buf) 176 FILE *fp; 177 char *offset, *buf; 178 { 179 180 do { 181 (void)printf("%s%s", offset, buf); 182 } while (fgets(buf, MAXLINELEN, fp)); 183 } 184 185 FILE * 186 file(name) 187 char *name; 188 { 189 FILE *fp; 190 191 if (!strcmp(name, "-")) 192 return (stdin); 193 if ((fp = fopen(name, "r")) == NULL) { 194 err(1, "%s", name); 195 } 196 return (fp); 197 } 198 199 static void 200 usage() 201 { 202 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 203 exit(1); 204 } 205 206 int 207 stricoll(s1, s2) 208 char *s1, *s2; 209 { 210 char *p, line1[MAXLINELEN], line2[MAXLINELEN]; 211 212 for (p = line1; *s1; s1++) 213 *p++ = tolower((unsigned char)*s1); 214 *p = '\0'; 215 for (p = line2; *s2; s2++) 216 *p++ = tolower((unsigned char)*s2); 217 *p = '\0'; 218 return strcoll(line1, line2); 219 } 220