1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #ifndef lint 36 static const char copyright[] = 37 "@(#) Copyright (c) 1989, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif 40 41 #if 0 42 #ifndef lint 43 static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95"; 44 #endif 45 #endif 46 47 #include <sys/cdefs.h> 48 __FBSDID("$FreeBSD$"); 49 50 #include <err.h> 51 #include <limits.h> 52 #include <locale.h> 53 #include <stdint.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 #include <wchar.h> 59 #include <wctype.h> 60 61 static int iflag; 62 static const char *tabs[] = { "", "\t", "\t\t" }; 63 64 static FILE *file(const char *); 65 static wchar_t *convert(const char *); 66 static void show(FILE *, const char *, const char *, char **, size_t *); 67 static void usage(void); 68 69 int 70 main(int argc, char *argv[]) 71 { 72 int comp, read1, read2; 73 int ch, flag1, flag2, flag3; 74 FILE *fp1, *fp2; 75 const char *col1, *col2, *col3; 76 size_t line1len, line2len; 77 char *line1, *line2; 78 ssize_t n1, n2; 79 wchar_t *tline1, *tline2; 80 const char **p; 81 82 (void) setlocale(LC_ALL, ""); 83 84 flag1 = flag2 = flag3 = 1; 85 86 while ((ch = getopt(argc, argv, "123i")) != -1) 87 switch(ch) { 88 case '1': 89 flag1 = 0; 90 break; 91 case '2': 92 flag2 = 0; 93 break; 94 case '3': 95 flag3 = 0; 96 break; 97 case 'i': 98 iflag = 1; 99 break; 100 case '?': 101 default: 102 usage(); 103 } 104 argc -= optind; 105 argv += optind; 106 107 if (argc != 2) 108 usage(); 109 110 fp1 = file(argv[0]); 111 fp2 = file(argv[1]); 112 113 /* for each column printed, add another tab offset */ 114 p = tabs; 115 col1 = col2 = col3 = NULL; 116 if (flag1) 117 col1 = *p++; 118 if (flag2) 119 col2 = *p++; 120 if (flag3) 121 col3 = *p; 122 123 line1len = line2len = 0; 124 line1 = line2 = NULL; 125 n1 = n2 = -1; 126 127 for (read1 = read2 = 1;;) { 128 /* read next line, check for EOF */ 129 if (read1) { 130 n1 = getline(&line1, &line1len, fp1); 131 if (n1 < 0 && ferror(fp1)) 132 err(1, "%s", argv[0]); 133 if (n1 > 0 && line1[n1 - 1] == '\n') 134 line1[n1 - 1] = '\0'; 135 136 } 137 if (read2) { 138 n2 = getline(&line2, &line2len, fp2); 139 if (n2 < 0 && ferror(fp2)) 140 err(1, "%s", argv[1]); 141 if (n2 > 0 && line2[n2 - 1] == '\n') 142 line2[n2 - 1] = '\0'; 143 } 144 145 /* if one file done, display the rest of the other file */ 146 if (n1 < 0) { 147 if (n2 >= 0 && col2 != NULL) 148 show(fp2, argv[1], col2, &line2, &line2len); 149 break; 150 } 151 if (n2 < 0) { 152 if (n1 >= 0 && col1 != NULL) 153 show(fp1, argv[0], col1, &line1, &line1len); 154 break; 155 } 156 157 tline2 = NULL; 158 if ((tline1 = convert(line1)) != NULL) 159 tline2 = convert(line2); 160 if (tline1 == NULL || tline2 == NULL) 161 comp = strcmp(line1, line2); 162 else 163 comp = wcscoll(tline1, tline2); 164 if (tline1 != NULL) 165 free(tline1); 166 if (tline2 != NULL) 167 free(tline2); 168 169 /* lines are the same */ 170 if (!comp) { 171 read1 = read2 = 1; 172 if (col3 != NULL) 173 (void)printf("%s%s\n", col3, line1); 174 continue; 175 } 176 177 /* lines are different */ 178 if (comp < 0) { 179 read1 = 1; 180 read2 = 0; 181 if (col1 != NULL) 182 (void)printf("%s%s\n", col1, line1); 183 } else { 184 read1 = 0; 185 read2 = 1; 186 if (col2 != NULL) 187 (void)printf("%s%s\n", col2, line2); 188 } 189 } 190 exit(0); 191 } 192 193 static wchar_t * 194 convert(const char *str) 195 { 196 size_t n; 197 wchar_t *buf, *p; 198 199 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 200 return (NULL); 201 if (SIZE_MAX / sizeof(*buf) < n + 1) 202 errx(1, "conversion buffer length overflow"); 203 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 204 err(1, "malloc"); 205 if (mbstowcs(buf, str, n + 1) != n) 206 errx(1, "internal mbstowcs() error"); 207 208 if (iflag) { 209 for (p = buf; *p != L'\0'; p++) 210 *p = towlower(*p); 211 } 212 213 return (buf); 214 } 215 216 static void 217 show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp) 218 { 219 ssize_t n; 220 221 do { 222 (void)printf("%s%s\n", offset, *bufp); 223 if ((n = getline(bufp, buflenp, fp)) < 0) 224 break; 225 if (n > 0 && (*bufp)[n - 1] == '\n') 226 (*bufp)[n - 1] = '\0'; 227 } while (1); 228 if (ferror(fp)) 229 err(1, "%s", fn); 230 } 231 232 static FILE * 233 file(const char *name) 234 { 235 FILE *fp; 236 237 if (!strcmp(name, "-")) 238 return (stdin); 239 if ((fp = fopen(name, "r")) == NULL) { 240 err(1, "%s", name); 241 } 242 return (fp); 243 } 244 245 static void 246 usage(void) 247 { 248 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 249 exit(1); 250 } 251