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