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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1989, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif 38 39 #if 0 40 #ifndef lint 41 static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95"; 42 #endif 43 #endif 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <err.h> 49 #include <limits.h> 50 #include <locale.h> 51 #include <stdint.h> 52 #define _WITH_GETLINE 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <wchar.h> 58 #include <wctype.h> 59 60 static int iflag; 61 static const char *tabs[] = { "", "\t", "\t\t" }; 62 63 static FILE *file(const char *); 64 static wchar_t *convert(const char *); 65 static void show(FILE *, const char *, const char *, char **, size_t *); 66 static void usage(void); 67 68 int 69 main(int argc, char *argv[]) 70 { 71 int comp, read1, read2; 72 int ch, flag1, flag2, flag3; 73 FILE *fp1, *fp2; 74 const char *col1, *col2, *col3; 75 size_t line1len, line2len; 76 char *line1, *line2; 77 ssize_t n1, n2; 78 wchar_t *tline1, *tline2; 79 const char **p; 80 81 (void) setlocale(LC_ALL, ""); 82 83 flag1 = flag2 = flag3 = 1; 84 85 while ((ch = getopt(argc, argv, "123i")) != -1) 86 switch(ch) { 87 case '1': 88 flag1 = 0; 89 break; 90 case '2': 91 flag2 = 0; 92 break; 93 case '3': 94 flag3 = 0; 95 break; 96 case 'i': 97 iflag = 1; 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (argc != 2) 107 usage(); 108 109 fp1 = file(argv[0]); 110 fp2 = file(argv[1]); 111 112 /* for each column printed, add another tab offset */ 113 p = tabs; 114 col1 = col2 = col3 = NULL; 115 if (flag1) 116 col1 = *p++; 117 if (flag2) 118 col2 = *p++; 119 if (flag3) 120 col3 = *p; 121 122 line1len = line2len = 0; 123 line1 = line2 = NULL; 124 n1 = n2 = -1; 125 126 for (read1 = read2 = 1;;) { 127 /* read next line, check for EOF */ 128 if (read1) { 129 n1 = getline(&line1, &line1len, fp1); 130 if (n1 < 0 && ferror(fp1)) 131 err(1, "%s", argv[0]); 132 if (n1 > 0 && line1[n1 - 1] == '\n') 133 line1[n1 - 1] = '\0'; 134 135 } 136 if (read2) { 137 n2 = getline(&line2, &line2len, fp2); 138 if (n2 < 0 && ferror(fp2)) 139 err(1, "%s", argv[1]); 140 if (n2 > 0 && line2[n2 - 1] == '\n') 141 line2[n2 - 1] = '\0'; 142 } 143 144 /* if one file done, display the rest of the other file */ 145 if (n1 < 0) { 146 if (n2 >= 0 && col2 != NULL) 147 show(fp2, argv[1], col2, &line2, &line2len); 148 break; 149 } 150 if (n2 < 0) { 151 if (n1 >= 0 && col1 != NULL) 152 show(fp1, argv[0], col1, &line1, &line1len); 153 break; 154 } 155 156 tline2 = NULL; 157 if ((tline1 = convert(line1)) != NULL) 158 tline2 = convert(line2); 159 if (tline1 == NULL || tline2 == NULL) 160 comp = strcmp(line1, line2); 161 else 162 comp = wcscoll(tline1, tline2); 163 if (tline1 != NULL) 164 free(tline1); 165 if (tline2 != NULL) 166 free(tline2); 167 168 /* lines are the same */ 169 if (!comp) { 170 read1 = read2 = 1; 171 if (col3 != NULL) 172 (void)printf("%s%s\n", col3, line1); 173 continue; 174 } 175 176 /* lines are different */ 177 if (comp < 0) { 178 read1 = 1; 179 read2 = 0; 180 if (col1 != NULL) 181 (void)printf("%s%s\n", col1, line1); 182 } else { 183 read1 = 0; 184 read2 = 1; 185 if (col2 != NULL) 186 (void)printf("%s%s\n", col2, line2); 187 } 188 } 189 exit(0); 190 } 191 192 static wchar_t * 193 convert(const char *str) 194 { 195 size_t n; 196 wchar_t *buf, *p; 197 198 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 199 return (NULL); 200 if (SIZE_MAX / sizeof(*buf) < n + 1) 201 errx(1, "conversion buffer length overflow"); 202 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 203 err(1, "malloc"); 204 if (mbstowcs(buf, str, n + 1) != n) 205 errx(1, "internal mbstowcs() error"); 206 207 if (iflag) { 208 for (p = buf; *p != L'\0'; p++) 209 *p = towlower(*p); 210 } 211 212 return (buf); 213 } 214 215 static void 216 show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp) 217 { 218 ssize_t n; 219 220 do { 221 (void)printf("%s%s\n", offset, *bufp); 222 if ((n = getline(bufp, buflenp, fp)) < 0) 223 break; 224 if (n > 0 && (*bufp)[n - 1] == '\n') 225 (*bufp)[n - 1] = '\0'; 226 } while (1); 227 if (ferror(fp)) 228 err(1, "%s", fn); 229 } 230 231 static FILE * 232 file(const char *name) 233 { 234 FILE *fp; 235 236 if (!strcmp(name, "-")) 237 return (stdin); 238 if ((fp = fopen(name, "r")) == NULL) { 239 err(1, "%s", name); 240 } 241 return (fp); 242 } 243 244 static void 245 usage(void) 246 { 247 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 248 exit(1); 249 } 250