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 227235 2011-11-06 18:49:10Z ed $ 35 */ 36 37 #include <err.h> 38 #include <limits.h> 39 #include <locale.h> 40 #include <stdint.h> 41 #define _WITH_GETLINE 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <wchar.h> 47 #include <wctype.h> 48 49 static int iflag; 50 static const char *tabs[] = { "", "\t", "\t\t" }; 51 52 static FILE *file(const char *); 53 static wchar_t *convert(const char *); 54 static void show(FILE *, const char *, const char *, char **, size_t *); 55 static void usage(void); 56 57 int 58 main(int argc, char *argv[]) 59 { 60 int comp, read1, read2; 61 int ch, flag1, flag2, flag3; 62 FILE *fp1, *fp2; 63 const char *col1, *col2, *col3; 64 size_t line1len, line2len; 65 char *line1, *line2; 66 ssize_t n1, n2; 67 wchar_t *tline1, *tline2; 68 const char **p; 69 70 (void) setlocale(LC_ALL, ""); 71 72 flag1 = flag2 = flag3 = 1; 73 74 while ((ch = getopt(argc, argv, "123i")) != -1) 75 switch(ch) { 76 case '1': 77 flag1 = 0; 78 break; 79 case '2': 80 flag2 = 0; 81 break; 82 case '3': 83 flag3 = 0; 84 break; 85 case 'i': 86 iflag = 1; 87 break; 88 case '?': 89 default: 90 usage(); 91 } 92 argc -= optind; 93 argv += optind; 94 95 if (argc != 2) 96 usage(); 97 98 fp1 = file(argv[0]); 99 fp2 = file(argv[1]); 100 101 /* for each column printed, add another tab offset */ 102 p = tabs; 103 col1 = col2 = col3 = NULL; 104 if (flag1) 105 col1 = *p++; 106 if (flag2) 107 col2 = *p++; 108 if (flag3) 109 col3 = *p; 110 111 line1len = line2len = 0; 112 line1 = line2 = NULL; 113 n1 = n2 = -1; 114 115 for (read1 = read2 = 1;;) { 116 /* read next line, check for EOF */ 117 if (read1) { 118 n1 = getline(&line1, &line1len, fp1); 119 if (n1 < 0 && ferror(fp1)) 120 err(1, "%s", argv[0]); 121 if (n1 > 0 && line1[n1 - 1] == '\n') 122 line1[n1 - 1] = '\0'; 123 124 } 125 if (read2) { 126 n2 = getline(&line2, &line2len, fp2); 127 if (n2 < 0 && ferror(fp2)) 128 err(1, "%s", argv[1]); 129 if (n2 > 0 && line2[n2 - 1] == '\n') 130 line2[n2 - 1] = '\0'; 131 } 132 133 /* if one file done, display the rest of the other file */ 134 if (n1 < 0) { 135 if (n2 >= 0 && col2 != NULL) 136 show(fp2, argv[1], col2, &line2, &line2len); 137 break; 138 } 139 if (n2 < 0) { 140 if (n1 >= 0 && col1 != NULL) 141 show(fp1, argv[0], col1, &line1, &line1len); 142 break; 143 } 144 145 tline2 = NULL; 146 if ((tline1 = convert(line1)) != NULL) 147 tline2 = convert(line2); 148 if (tline1 == NULL || tline2 == NULL) 149 comp = strcmp(line1, line2); 150 else 151 comp = wcscoll(tline1, tline2); 152 if (tline1 != NULL) 153 free(tline1); 154 if (tline2 != NULL) 155 free(tline2); 156 157 /* lines are the same */ 158 if (!comp) { 159 read1 = read2 = 1; 160 if (col3 != NULL) 161 (void)printf("%s%s\n", col3, line1); 162 continue; 163 } 164 165 /* lines are different */ 166 if (comp < 0) { 167 read1 = 1; 168 read2 = 0; 169 if (col1 != NULL) 170 (void)printf("%s%s\n", col1, line1); 171 } else { 172 read1 = 0; 173 read2 = 1; 174 if (col2 != NULL) 175 (void)printf("%s%s\n", col2, line2); 176 } 177 } 178 exit(0); 179 } 180 181 static wchar_t * 182 convert(const char *str) 183 { 184 size_t n; 185 wchar_t *buf, *p; 186 187 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 188 return (NULL); 189 if (SIZE_MAX / sizeof(*buf) < n + 1) 190 errx(1, "conversion buffer length overflow"); 191 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 192 err(1, "malloc"); 193 if (mbstowcs(buf, str, n + 1) != n) 194 errx(1, "internal mbstowcs() error"); 195 196 if (iflag) { 197 for (p = buf; *p != L'\0'; p++) 198 *p = towlower(*p); 199 } 200 201 return (buf); 202 } 203 204 static void 205 show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp) 206 { 207 ssize_t n; 208 209 do { 210 (void)printf("%s%s\n", offset, *bufp); 211 if ((n = getline(bufp, buflenp, fp)) < 0) 212 break; 213 if (n > 0 && (*bufp)[n - 1] == '\n') 214 (*bufp)[n - 1] = '\0'; 215 } while (1); 216 if (ferror(fp)) 217 err(1, "%s", fn); 218 } 219 220 static FILE * 221 file(const char *name) 222 { 223 FILE *fp; 224 225 if (!strcmp(name, "-")) 226 return (stdin); 227 if ((fp = fopen(name, "r")) == NULL) { 228 err(1, "%s", name); 229 } 230 return (fp); 231 } 232 233 static void 234 usage(void) 235 { 236 (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n"); 237 exit(1); 238 } 239