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 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved. 33 * @(#)comm.c 8.4 (Berkeley) 5/4/95 34 * $FreeBSD: head/usr.bin/comm/comm.c 303526 2016-07-30 01:07:47Z bapt $ 35 */ 36 37 #include <err.h> 38 #include <limits.h> 39 #include <locale.h> 40 #include <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <wchar.h> 46 #include <wctype.h> 47 48 static int iflag; 49 static const char *tabs[] = { "", "\t", "\t\t" }; 50 51 static FILE *file(const char *); 52 static wchar_t *convert(const char *); 53 static void show(FILE *, const char *, const char *, char **, size_t *); 54 static void usage(void); 55 56 int 57 main(int argc, char *argv[]) 58 { 59 int comp, read1, read2; 60 int ch, flag1, flag2, flag3; 61 FILE *fp1, *fp2; 62 const char *col1, *col2, *col3; 63 size_t line1len, line2len; 64 char *line1, *line2; 65 ssize_t n1, n2; 66 wchar_t *tline1, *tline2; 67 const char **p; 68 69 (void) setlocale(LC_ALL, ""); 70 71 flag1 = flag2 = flag3 = 1; 72 73 while ((ch = getopt(argc, argv, "123i")) != -1) 74 switch(ch) { 75 case '1': 76 flag1 = 0; 77 break; 78 case '2': 79 flag2 = 0; 80 break; 81 case '3': 82 flag3 = 0; 83 break; 84 case 'i': 85 iflag = 1; 86 break; 87 case '?': 88 default: 89 usage(); 90 } 91 argc -= optind; 92 argv += optind; 93 94 if (argc != 2) 95 usage(); 96 97 fp1 = file(argv[0]); 98 fp2 = file(argv[1]); 99 100 /* for each column printed, add another tab offset */ 101 p = tabs; 102 col1 = col2 = col3 = NULL; 103 if (flag1) 104 col1 = *p++; 105 if (flag2) 106 col2 = *p++; 107 if (flag3) 108 col3 = *p; 109 110 line1len = line2len = 0; 111 line1 = line2 = NULL; 112 n1 = n2 = -1; 113 114 for (read1 = read2 = 1;;) { 115 /* read next line, check for EOF */ 116 if (read1) { 117 n1 = getline(&line1, &line1len, fp1); 118 if (n1 < 0 && ferror(fp1)) 119 err(1, "%s", argv[0]); 120 if (n1 > 0 && line1[n1 - 1] == '\n') 121 line1[n1 - 1] = '\0'; 122 123 } 124 if (read2) { 125 n2 = getline(&line2, &line2len, fp2); 126 if (n2 < 0 && ferror(fp2)) 127 err(1, "%s", argv[1]); 128 if (n2 > 0 && line2[n2 - 1] == '\n') 129 line2[n2 - 1] = '\0'; 130 } 131 132 /* if one file done, display the rest of the other file */ 133 if (n1 < 0) { 134 if (n2 >= 0 && col2 != NULL) 135 show(fp2, argv[1], col2, &line2, &line2len); 136 break; 137 } 138 if (n2 < 0) { 139 if (n1 >= 0 && col1 != NULL) 140 show(fp1, argv[0], col1, &line1, &line1len); 141 break; 142 } 143 144 tline2 = NULL; 145 if ((tline1 = convert(line1)) != NULL) 146 tline2 = convert(line2); 147 if (tline1 == NULL || tline2 == NULL) 148 comp = strcmp(line1, line2); 149 else 150 comp = wcscoll(tline1, tline2); 151 if (tline1 != NULL) 152 free(tline1); 153 if (tline2 != NULL) 154 free(tline2); 155 156 /* lines are the same */ 157 if (!comp) { 158 read1 = read2 = 1; 159 if (col3 != NULL) 160 (void)printf("%s%s\n", col3, line1); 161 continue; 162 } 163 164 /* lines are different */ 165 if (comp < 0) { 166 read1 = 1; 167 read2 = 0; 168 if (col1 != NULL) 169 (void)printf("%s%s\n", col1, line1); 170 } else { 171 read1 = 0; 172 read2 = 1; 173 if (col2 != NULL) 174 (void)printf("%s%s\n", col2, line2); 175 } 176 } 177 exit(0); 178 } 179 180 static wchar_t * 181 convert(const char *str) 182 { 183 size_t n; 184 wchar_t *buf, *p; 185 186 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 187 return (NULL); 188 if (SIZE_MAX / sizeof(*buf) < n + 1) 189 errx(1, "conversion buffer length overflow"); 190 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 191 err(1, "malloc"); 192 if (mbstowcs(buf, str, n + 1) != n) 193 errx(1, "internal mbstowcs() error"); 194 195 if (iflag) { 196 for (p = buf; *p != L'\0'; p++) 197 *p = towlower(*p); 198 } 199 200 return (buf); 201 } 202 203 static void 204 show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp) 205 { 206 ssize_t n; 207 208 do { 209 (void)printf("%s%s\n", offset, *bufp); 210 if ((n = getline(bufp, buflenp, fp)) < 0) 211 break; 212 if (n > 0 && (*bufp)[n - 1] == '\n') 213 (*bufp)[n - 1] = '\0'; 214 } while (1); 215 if (ferror(fp)) 216 err(1, "%s", fn); 217 } 218 219 static FILE * 220 file(const char *name) 221 { 222 FILE *fp; 223 224 if (!strcmp(name, "-")) 225 return (stdin); 226 if ((fp = fopen(name, "r")) == NULL) { 227 err(1, "%s", name); 228 } 229 return (fp); 230 } 231 232 static void 233 usage(void) 234 { 235 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 236 exit(1); 237 } 238