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 <err.h> 53 #include <limits.h> 54 #include <locale.h> 55 #include <stdint.h> 56 #define _WITH_GETLINE 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #include <wchar.h> 62 #include <wctype.h> 63 64 int iflag; 65 const char *tabs[] = { "", "\t", "\t\t" }; 66 67 FILE *file(const char *); 68 wchar_t *convert(const char *); 69 void show(FILE *, const char *, const char *, char **, size_t *); 70 static void usage(void); 71 72 int 73 main(int argc, char *argv[]) 74 { 75 int comp, read1, read2; 76 int ch, flag1, flag2, flag3; 77 FILE *fp1, *fp2; 78 const char *col1, *col2, *col3; 79 size_t line1len, line2len; 80 char *line1, *line2; 81 ssize_t n1, n2; 82 wchar_t *tline1, *tline2; 83 const char **p; 84 85 (void) setlocale(LC_ALL, ""); 86 87 flag1 = flag2 = flag3 = 1; 88 89 while ((ch = getopt(argc, argv, "123i")) != -1) 90 switch(ch) { 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 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 line1len = line2len = 0; 127 line1 = line2 = NULL; 128 n1 = n2 = -1; 129 130 for (read1 = read2 = 1;;) { 131 /* read next line, check for EOF */ 132 if (read1) { 133 n1 = getline(&line1, &line1len, fp1); 134 if (n1 < 0 && ferror(fp1)) 135 err(1, "%s", argv[0]); 136 if (n1 > 0 && line1[n1 - 1] == '\n') 137 line1[n1 - 1] = '\0'; 138 139 } 140 if (read2) { 141 n2 = getline(&line2, &line2len, fp2); 142 if (n2 < 0 && ferror(fp2)) 143 err(1, "%s", argv[1]); 144 if (n2 > 0 && line2[n2 - 1] == '\n') 145 line2[n2 - 1] = '\0'; 146 } 147 148 /* if one file done, display the rest of the other file */ 149 if (n1 < 0) { 150 if (n2 >= 0 && col2 != NULL) 151 show(fp2, argv[1], col2, &line2, &line2len); 152 break; 153 } 154 if (n2 < 0) { 155 if (n1 >= 0 && col1 != NULL) 156 show(fp1, argv[0], col1, &line1, &line1len); 157 break; 158 } 159 160 tline2 = NULL; 161 if ((tline1 = convert(line1)) != NULL) 162 tline2 = convert(line2); 163 if (tline1 == NULL || tline2 == NULL) 164 comp = strcmp(line1, line2); 165 else 166 comp = wcscoll(tline1, tline2); 167 if (tline1 != NULL) 168 free(tline1); 169 if (tline2 != NULL) 170 free(tline2); 171 172 /* lines are the same */ 173 if (!comp) { 174 read1 = read2 = 1; 175 if (col3 != NULL) 176 (void)printf("%s%s\n", col3, line1); 177 continue; 178 } 179 180 /* lines are different */ 181 if (comp < 0) { 182 read1 = 1; 183 read2 = 0; 184 if (col1 != NULL) 185 (void)printf("%s%s\n", col1, line1); 186 } else { 187 read1 = 0; 188 read2 = 1; 189 if (col2 != NULL) 190 (void)printf("%s%s\n", col2, line2); 191 } 192 } 193 exit(0); 194 } 195 196 wchar_t * 197 convert(const char *str) 198 { 199 size_t n; 200 wchar_t *buf, *p; 201 202 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 203 return (NULL); 204 if (SIZE_MAX / sizeof(*buf) < n + 1) 205 errx(1, "conversion buffer length overflow"); 206 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 207 err(1, "malloc"); 208 if (mbstowcs(buf, str, n + 1) != n) 209 errx(1, "internal mbstowcs() error"); 210 211 if (iflag) { 212 for (p = buf; *p != L'\0'; p++) 213 *p = towlower(*p); 214 } 215 216 return (buf); 217 } 218 219 void 220 show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp) 221 { 222 ssize_t n; 223 224 do { 225 (void)printf("%s%s\n", offset, *bufp); 226 if ((n = getline(bufp, buflenp, fp)) < 0) 227 break; 228 if (n > 0 && (*bufp)[n - 1] == '\n') 229 (*bufp)[n - 1] = '\0'; 230 } while (1); 231 if (ferror(fp)) 232 err(1, "%s", fn); 233 } 234 235 FILE * 236 file(const char *name) 237 { 238 FILE *fp; 239 240 if (!strcmp(name, "-")) 241 return (stdin); 242 if ((fp = fopen(name, "r")) == NULL) { 243 err(1, "%s", name); 244 } 245 return (fp); 246 } 247 248 static void 249 usage(void) 250 { 251 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 252 exit(1); 253 } 254