1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Case Larsen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/capsicum.h> 36 37 #include <capsicum_helpers.h> 38 #include <ctype.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <getopt.h> 42 #include <limits.h> 43 #include <locale.h> 44 #include <nl_types.h> 45 #include <stdbool.h> 46 #include <stdint.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <termios.h> 51 #include <unistd.h> 52 #include <wchar.h> 53 #include <wctype.h> 54 55 static enum { DF_NONE, DF_NOSEP, DF_PRESEP, DF_POSTSEP } Dflag; 56 static bool cflag, dflag, uflag, iflag; 57 static long long numchars, numfields, repeats; 58 59 static const struct option long_opts[] = 60 { 61 {"all-repeated",optional_argument, NULL, 'D'}, 62 {"count", no_argument, NULL, 'c'}, 63 {"repeated", no_argument, NULL, 'd'}, 64 {"skip-fields", required_argument, NULL, 'f'}, 65 {"ignore-case", no_argument, NULL, 'i'}, 66 {"skip-chars", required_argument, NULL, 's'}, 67 {"unique", no_argument, NULL, 'u'}, 68 {NULL, no_argument, NULL, 0} 69 }; 70 71 static FILE *file(const char *, const char *); 72 static wchar_t *convert(const char *); 73 static int inlcmp(const char *, const char *); 74 static void show(FILE *, const char *); 75 static wchar_t *skip(wchar_t *); 76 static void obsolete(char *[]); 77 static void usage(void); 78 79 int 80 main (int argc, char *argv[]) 81 { 82 wchar_t *tprev, *tthis; 83 FILE *ifp, *ofp; 84 int ch, comp; 85 size_t prevbuflen, thisbuflen, b1; 86 char *prevline, *thisline, *p; 87 const char *errstr, *ifn, *ofn; 88 cap_rights_t rights; 89 90 (void) setlocale(LC_ALL, ""); 91 92 obsolete(argv); 93 while ((ch = getopt_long(argc, argv, "+D::cdif:s:u", long_opts, 94 NULL)) != -1) 95 switch (ch) { 96 case 'D': 97 if (optarg == NULL || strcasecmp(optarg, "none") == 0) 98 Dflag = DF_NOSEP; 99 else if (strcasecmp(optarg, "prepend") == 0) 100 Dflag = DF_PRESEP; 101 else if (strcasecmp(optarg, "separate") == 0) 102 Dflag = DF_POSTSEP; 103 else 104 usage(); 105 break; 106 case 'c': 107 cflag = true; 108 break; 109 case 'd': 110 dflag = true; 111 break; 112 case 'i': 113 iflag = true; 114 break; 115 case 'f': 116 numfields = strtonum(optarg, 0, INT_MAX, &errstr); 117 if (errstr) 118 errx(1, "field skip value is %s: %s", errstr, optarg); 119 break; 120 case 's': 121 numchars = strtonum(optarg, 0, INT_MAX, &errstr); 122 if (errstr != NULL) 123 errx(1, "character skip value is %s: %s", errstr, optarg); 124 break; 125 case 'u': 126 uflag = true; 127 break; 128 case '?': 129 default: 130 usage(); 131 } 132 133 argc -= optind; 134 argv += optind; 135 136 if (argc > 2) 137 usage(); 138 139 if (Dflag && dflag) 140 dflag = false; 141 142 ifp = stdin; 143 ifn = "stdin"; 144 ofp = stdout; 145 ofn = "stdout"; 146 if (argc > 0 && strcmp(argv[0], "-") != 0) 147 ifp = file(ifn = argv[0], "r"); 148 cap_rights_init(&rights, CAP_FSTAT, CAP_READ); 149 if (caph_rights_limit(fileno(ifp), &rights) < 0) 150 err(1, "unable to limit rights for %s", ifn); 151 cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE); 152 if (argc > 1) 153 ofp = file(ofn = argv[1], "w"); 154 else 155 cap_rights_set(&rights, CAP_IOCTL); 156 if (caph_rights_limit(fileno(ofp), &rights) < 0) { 157 err(1, "unable to limit rights for %s", 158 argc > 1 ? argv[1] : "stdout"); 159 } 160 if (cap_rights_is_set(&rights, CAP_IOCTL)) { 161 unsigned long cmd; 162 163 cmd = TIOCGETA; /* required by isatty(3) in printf(3) */ 164 165 if (caph_ioctls_limit(fileno(ofp), &cmd, 1) < 0) { 166 err(1, "unable to limit ioctls for %s", 167 argc > 1 ? argv[1] : "stdout"); 168 } 169 } 170 171 caph_cache_catpages(); 172 if (caph_enter() < 0) 173 err(1, "unable to enter capability mode"); 174 175 prevbuflen = thisbuflen = 0; 176 prevline = thisline = NULL; 177 178 if (getline(&prevline, &prevbuflen, ifp) < 0) { 179 if (ferror(ifp)) 180 err(1, "%s", ifn); 181 exit(0); 182 } 183 if (!cflag && !Dflag && !dflag && !uflag) 184 show(ofp, prevline); 185 tprev = convert(prevline); 186 187 tthis = NULL; 188 while (getline(&thisline, &thisbuflen, ifp) >= 0) { 189 if (tthis != NULL) 190 free(tthis); 191 tthis = convert(thisline); 192 193 if (tthis == NULL && tprev == NULL) 194 comp = inlcmp(thisline, prevline); 195 else if (tthis == NULL || tprev == NULL) 196 comp = 1; 197 else 198 comp = wcscoll(tthis, tprev); 199 200 if (comp) { 201 /* If different, print; set previous to new value. */ 202 if (Dflag == DF_POSTSEP && repeats > 0) 203 fputc('\n', ofp); 204 if (!cflag && !Dflag && !dflag && !uflag) 205 show(ofp, thisline); 206 else if (!Dflag && 207 (!dflag || (cflag && repeats > 0)) && 208 (!uflag || repeats == 0)) 209 show(ofp, prevline); 210 p = prevline; 211 b1 = prevbuflen; 212 prevline = thisline; 213 prevbuflen = thisbuflen; 214 if (tprev != NULL) 215 free(tprev); 216 tprev = tthis; 217 thisline = p; 218 thisbuflen = b1; 219 tthis = NULL; 220 repeats = 0; 221 } else { 222 if (Dflag) { 223 if (repeats == 0) { 224 if (Dflag == DF_PRESEP) 225 fputc('\n', ofp); 226 show(ofp, prevline); 227 } 228 show(ofp, thisline); 229 } else if (dflag && !cflag) { 230 if (repeats == 0) 231 show(ofp, prevline); 232 } 233 ++repeats; 234 } 235 } 236 if (ferror(ifp)) 237 err(1, "%s", ifn); 238 if (!cflag && !Dflag && !dflag && !uflag) 239 /* already printed */ ; 240 else if (!Dflag && 241 (!dflag || (cflag && repeats > 0)) && 242 (!uflag || repeats == 0)) 243 show(ofp, prevline); 244 if (fflush(ofp) != 0) 245 err(1, "%s", ofn); 246 exit(0); 247 } 248 249 static wchar_t * 250 convert(const char *str) 251 { 252 size_t n; 253 wchar_t *buf, *ret, *p; 254 255 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 256 return (NULL); 257 if (SIZE_MAX / sizeof(*buf) < n + 1) 258 errx(1, "conversion buffer length overflow"); 259 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 260 err(1, "malloc"); 261 if (mbstowcs(buf, str, n + 1) != n) 262 errx(1, "internal mbstowcs() error"); 263 /* The last line may not end with \n. */ 264 if (n > 0 && buf[n - 1] == L'\n') 265 buf[n - 1] = L'\0'; 266 267 /* If requested get the chosen fields + character offsets. */ 268 if (numfields || numchars) { 269 if ((ret = wcsdup(skip(buf))) == NULL) 270 err(1, "wcsdup"); 271 free(buf); 272 } else 273 ret = buf; 274 275 if (iflag) { 276 for (p = ret; *p != L'\0'; p++) 277 *p = towlower(*p); 278 } 279 280 return (ret); 281 } 282 283 static int 284 inlcmp(const char *s1, const char *s2) 285 { 286 int c1, c2; 287 288 while (*s1 == *s2++) 289 if (*s1++ == '\0') 290 return (0); 291 c1 = (unsigned char)*s1; 292 c2 = (unsigned char)*(s2 - 1); 293 /* The last line may not end with \n. */ 294 if (c1 == '\n') 295 c1 = '\0'; 296 if (c2 == '\n') 297 c2 = '\0'; 298 return (c1 - c2); 299 } 300 301 /* 302 * show -- 303 * Output a line depending on the flags and number of repetitions 304 * of the line. 305 */ 306 static void 307 show(FILE *ofp, const char *str) 308 { 309 if (cflag) 310 (void)fprintf(ofp, "%4lld %s", repeats + 1, str); 311 else 312 (void)fprintf(ofp, "%s", str); 313 } 314 315 static wchar_t * 316 skip(wchar_t *str) 317 { 318 long long nchars, nfields; 319 320 for (nfields = 0; *str != L'\0' && nfields++ != numfields; ) { 321 while (iswblank(*str)) 322 str++; 323 while (*str != L'\0' && !iswblank(*str)) 324 str++; 325 } 326 for (nchars = numchars; nchars-- && *str != L'\0'; ++str) 327 ; 328 return(str); 329 } 330 331 static FILE * 332 file(const char *name, const char *mode) 333 { 334 FILE *fp; 335 336 if ((fp = fopen(name, mode)) == NULL) 337 err(1, "%s", name); 338 return(fp); 339 } 340 341 static void 342 obsolete(char *argv[]) 343 { 344 char *ap, *p; 345 346 while ((ap = *++argv)) { 347 /* Return if "--" or not an option of any form. */ 348 if (ap[0] != '-') { 349 if (ap[0] != '+') 350 return; 351 } else if (ap[1] == '-') { 352 return; 353 } 354 if (!isdigit((unsigned char)ap[1])) 355 continue; 356 /* 357 * Digit signifies an old-style option. Malloc space for dash, 358 * new option and argument. 359 */ 360 if (asprintf(&p, "-%c%s", ap[0] == '+' ? 's' : 'f', ap + 1) < 0) 361 err(1, "malloc"); 362 *argv = p; 363 } 364 } 365 366 static void 367 usage(void) 368 { 369 (void)fprintf(stderr, 370 "usage: uniq [-c | -d | -D | -u] [-i] [-f fields] [-s chars] [input [output]]\n"); 371 exit(1); 372 } 373