1 /* 2 * Copyright (c) 1989, 1993 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\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95"; 42 #endif 43 static const char rcsid[] = 44 "$FreeBSD$"; 45 #endif /* not lint */ 46 47 #include <sys/capsicum.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <limits.h> 53 #include <locale.h> 54 #include <nl_types.h> 55 #include <stdint.h> 56 #define _WITH_GETLINE 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <termios.h> 61 #include <unistd.h> 62 #include <wchar.h> 63 #include <wctype.h> 64 65 static int cflag, dflag, uflag, iflag; 66 static int numchars, numfields, repeats; 67 68 static FILE *file(const char *, const char *); 69 static wchar_t *convert(const char *); 70 static int inlcmp(const char *, const char *); 71 static void show(FILE *, const char *); 72 static wchar_t *skip(wchar_t *); 73 static void obsolete(char *[]); 74 static void usage(void); 75 76 static void 77 strerror_init(void) 78 { 79 80 /* 81 * Cache NLS data before entering capability mode. 82 * XXXPJD: There should be strerror_init() and strsignal_init() in libc. 83 */ 84 (void)catopen("libc", NL_CAT_LOCALE); 85 } 86 87 int 88 main (int argc, char *argv[]) 89 { 90 wchar_t *tprev, *tthis; 91 FILE *ifp, *ofp; 92 int ch, comp; 93 size_t prevbuflen, thisbuflen, b1; 94 char *prevline, *thisline, *p; 95 const char *ifn; 96 cap_rights_t rights; 97 98 (void) setlocale(LC_ALL, ""); 99 100 obsolete(argv); 101 while ((ch = getopt(argc, argv, "cdif:s:u")) != -1) 102 switch (ch) { 103 case 'c': 104 cflag = 1; 105 break; 106 case 'd': 107 dflag = 1; 108 break; 109 case 'i': 110 iflag = 1; 111 break; 112 case 'f': 113 numfields = strtol(optarg, &p, 10); 114 if (numfields < 0 || *p) 115 errx(1, "illegal field skip value: %s", optarg); 116 break; 117 case 's': 118 numchars = strtol(optarg, &p, 10); 119 if (numchars < 0 || *p) 120 errx(1, "illegal character skip value: %s", optarg); 121 break; 122 case 'u': 123 uflag = 1; 124 break; 125 case '?': 126 default: 127 usage(); 128 } 129 130 argc -= optind; 131 argv += optind; 132 133 /* If no flags are set, default is -d -u. */ 134 if (cflag) { 135 if (dflag || uflag) 136 usage(); 137 } else if (!dflag && !uflag) 138 dflag = uflag = 1; 139 140 if (argc > 2) 141 usage(); 142 143 ifp = stdin; 144 ifn = "stdin"; 145 ofp = 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 (cap_rights_limit(fileno(ifp), &rights) < 0 && errno != ENOSYS) 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(argv[1], "w"); 154 else 155 cap_rights_set(&rights, CAP_IOCTL); 156 if (cap_rights_limit(fileno(ofp), &rights) < 0 && errno != ENOSYS) { 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 (cap_ioctls_limit(fileno(ofp), &cmd, 1) < 0 && 166 errno != ENOSYS) { 167 err(1, "unable to limit ioctls for %s", 168 argc > 1 ? argv[1] : "stdout"); 169 } 170 } 171 172 strerror_init(); 173 if (cap_enter() < 0 && errno != ENOSYS) 174 err(1, "unable to enter capability mode"); 175 176 prevbuflen = thisbuflen = 0; 177 prevline = thisline = NULL; 178 179 if (getline(&prevline, &prevbuflen, ifp) < 0) { 180 if (ferror(ifp)) 181 err(1, "%s", ifn); 182 exit(0); 183 } 184 tprev = convert(prevline); 185 186 if (!cflag && uflag && dflag) 187 show(ofp, prevline); 188 189 tthis = NULL; 190 while (getline(&thisline, &thisbuflen, ifp) >= 0) { 191 if (tthis != NULL) 192 free(tthis); 193 tthis = convert(thisline); 194 195 if (tthis == NULL && tprev == NULL) 196 comp = inlcmp(thisline, prevline); 197 else if (tthis == NULL || tprev == NULL) 198 comp = 1; 199 else 200 comp = wcscoll(tthis, tprev); 201 202 if (comp) { 203 /* If different, print; set previous to new value. */ 204 if (cflag || !dflag || !uflag) 205 show(ofp, prevline); 206 p = prevline; 207 b1 = prevbuflen; 208 prevline = thisline; 209 prevbuflen = thisbuflen; 210 if (tprev != NULL) 211 free(tprev); 212 tprev = tthis; 213 if (!cflag && uflag && dflag) 214 show(ofp, prevline); 215 thisline = p; 216 thisbuflen = b1; 217 tthis = NULL; 218 repeats = 0; 219 } else 220 ++repeats; 221 } 222 if (ferror(ifp)) 223 err(1, "%s", ifn); 224 if (cflag || !dflag || !uflag) 225 show(ofp, prevline); 226 exit(0); 227 } 228 229 static wchar_t * 230 convert(const char *str) 231 { 232 size_t n; 233 wchar_t *buf, *ret, *p; 234 235 if ((n = mbstowcs(NULL, str, 0)) == (size_t)-1) 236 return (NULL); 237 if (SIZE_MAX / sizeof(*buf) < n + 1) 238 errx(1, "conversion buffer length overflow"); 239 if ((buf = malloc((n + 1) * sizeof(*buf))) == NULL) 240 err(1, "malloc"); 241 if (mbstowcs(buf, str, n + 1) != n) 242 errx(1, "internal mbstowcs() error"); 243 /* The last line may not end with \n. */ 244 if (n > 0 && buf[n - 1] == L'\n') 245 buf[n - 1] = L'\0'; 246 247 /* If requested get the chosen fields + character offsets. */ 248 if (numfields || numchars) { 249 if ((ret = wcsdup(skip(buf))) == NULL) 250 err(1, "wcsdup"); 251 free(buf); 252 } else 253 ret = buf; 254 255 if (iflag) { 256 for (p = ret; *p != L'\0'; p++) 257 *p = towlower(*p); 258 } 259 260 return (ret); 261 } 262 263 static int 264 inlcmp(const char *s1, const char *s2) 265 { 266 int c1, c2; 267 268 while (*s1 == *s2++) 269 if (*s1++ == '\0') 270 return (0); 271 c1 = (unsigned char)*s1; 272 c2 = (unsigned char)*(s2 - 1); 273 /* The last line may not end with \n. */ 274 if (c1 == '\n') 275 c1 = '\0'; 276 if (c2 == '\n') 277 c2 = '\0'; 278 return (c1 - c2); 279 } 280 281 /* 282 * show -- 283 * Output a line depending on the flags and number of repetitions 284 * of the line. 285 */ 286 static void 287 show(FILE *ofp, const char *str) 288 { 289 290 if (cflag) 291 (void)fprintf(ofp, "%4d %s", repeats + 1, str); 292 if ((dflag && repeats) || (uflag && !repeats)) 293 (void)fprintf(ofp, "%s", str); 294 } 295 296 static wchar_t * 297 skip(wchar_t *str) 298 { 299 int nchars, nfields; 300 301 for (nfields = 0; *str != L'\0' && nfields++ != numfields; ) { 302 while (iswblank(*str)) 303 str++; 304 while (*str != L'\0' && !iswblank(*str)) 305 str++; 306 } 307 for (nchars = numchars; nchars-- && *str != L'\0'; ++str) 308 ; 309 return(str); 310 } 311 312 static FILE * 313 file(const char *name, const char *mode) 314 { 315 FILE *fp; 316 317 if ((fp = fopen(name, mode)) == NULL) 318 err(1, "%s", name); 319 return(fp); 320 } 321 322 static void 323 obsolete(char *argv[]) 324 { 325 int len; 326 char *ap, *p, *start; 327 328 while ((ap = *++argv)) { 329 /* Return if "--" or not an option of any form. */ 330 if (ap[0] != '-') { 331 if (ap[0] != '+') 332 return; 333 } else if (ap[1] == '-') 334 return; 335 if (!isdigit((unsigned char)ap[1])) 336 continue; 337 /* 338 * Digit signifies an old-style option. Malloc space for dash, 339 * new option and argument. 340 */ 341 len = strlen(ap); 342 if ((start = p = malloc(len + 3)) == NULL) 343 err(1, "malloc"); 344 *p++ = '-'; 345 *p++ = ap[0] == '+' ? 's' : 'f'; 346 (void)strcpy(p, ap + 1); 347 *argv = start; 348 } 349 } 350 351 static void 352 usage(void) 353 { 354 (void)fprintf(stderr, 355 "usage: uniq [-c | -d | -u] [-i] [-f fields] [-s chars] [input [output]]\n"); 356 exit(1); 357 } 358