1 /* $NetBSD: comm.c,v 1.18 2009/11/28 03:56:38 darcy Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Case Larsen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\ 38 The Regents of the University of California. All rights reserved."); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)comm.c 8.4 (Berkeley) 5/4/95"; 44 #endif 45 __RCSID("$NetBSD: comm.c,v 1.18 2009/11/28 03:56:38 darcy Exp $"); 46 #endif /* not lint */ 47 48 #include <err.h> 49 #include <limits.h> 50 #include <locale.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #define MAXLINELEN (LINE_MAX + 1) 57 58 const char *tabs[] = { "", "\t", "\t\t" }; 59 60 FILE *file(const char *); 61 void show(FILE *, const char *, char *); 62 void usage(void); 63 char *getnextln(char *buf, FILE *); 64 65 int 66 main(int argc, char **argv) 67 { 68 int comp, file1done, file2done, read1, read2; 69 int ch, flag1, flag2, flag3; 70 FILE *fp1, *fp2; 71 const char *col1, *col2, *col3, **p; 72 char line1[MAXLINELEN], line2[MAXLINELEN]; 73 int (*compare)(const char*,const char*); 74 75 (void)setlocale(LC_ALL, ""); 76 77 file1done = file2done = 0; 78 flag1 = flag2 = flag3 = 1; 79 compare = strcoll; 80 while ((ch = getopt(argc, argv, "123f")) != -1) 81 switch(ch) { 82 case '1': 83 flag1 = 0; 84 break; 85 case '2': 86 flag2 = 0; 87 break; 88 case '3': 89 flag3 = 0; 90 break; 91 case 'f': 92 compare = strcasecmp; 93 break; 94 case '?': 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if (argc != 2) 102 usage(); 103 104 fp1 = file(argv[0]); 105 fp2 = file(argv[1]); 106 107 /* for each column printed, add another tab offset */ 108 p = tabs; 109 col1 = col2 = col3 = NULL; 110 if (flag1) 111 col1 = *p++; 112 if (flag2) 113 col2 = *p++; 114 if (flag3) 115 col3 = *p; 116 117 for (read1 = read2 = 1;;) { 118 /* read next line, check for EOF */ 119 if (read1) 120 file1done = !getnextln(line1, fp1); 121 if (read2) 122 file2done = !getnextln(line2, fp2); 123 124 /* if one file done, display the rest of the other file */ 125 if (file1done) { 126 if (!file2done && col2) 127 show(fp2, col2, line2); 128 break; 129 } 130 if (file2done) { 131 if (!file1done && col1) 132 show(fp1, col1, line1); 133 break; 134 } 135 136 /* lines are the same */ 137 if (!(comp = compare(line1, line2))) { 138 read1 = read2 = 1; 139 if (col3) 140 if (printf("%s%s\n", col3, line1) < 0) 141 break; 142 continue; 143 } 144 145 /* lines are different */ 146 if (comp < 0) { 147 read1 = 1; 148 read2 = 0; 149 if (col1) 150 if (printf("%s%s\n", col1, line1) < 0) 151 break; 152 } else { 153 read1 = 0; 154 read2 = 1; 155 if (col2) 156 if (printf("%s%s\n", col2, line2) < 0) 157 break; 158 } 159 } 160 161 if (ferror (stdout) || fclose (stdout) == EOF) 162 err(1, "stdout"); 163 164 exit(0); 165 } 166 167 void 168 show(FILE *fp, const char *offset, char *buf) 169 { 170 while (printf("%s%s\n", offset, buf) >= 0 && getnextln(buf, fp)) 171 ; 172 } 173 174 FILE * 175 file(const char *name) 176 { 177 FILE *fp; 178 179 if (!strcmp(name, "-")) 180 return (stdin); 181 if ((fp = fopen(name, "r")) == NULL) 182 err(1, "%s", name); 183 return (fp); 184 } 185 186 void 187 usage(void) 188 { 189 190 (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n"); 191 exit(1); 192 } 193 194 char * 195 getnextln(char *buf, FILE *fp) 196 { 197 size_t i = 0; 198 int c; 199 200 while ((c = fgetc(fp)) != '\n' && c != EOF) { 201 buf[i++] = c; 202 203 if (i >= MAXLINELEN) 204 i--; /* consumes extra characters till newline */ 205 } 206 207 if (c == EOF && !i) 208 return NULL; 209 210 buf[i] = 0; 211 return buf; 212 } 213 214