| File: | src/usr.bin/uniq/uniq.c |
| Warning: | line 156, column 4 Value stored to 't' is never read |
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| 1 | /* $OpenBSD: uniq.c,v 1.33 2022/01/01 18:20:52 cheloha Exp $ */ |
| 2 | /* $NetBSD: uniq.c,v 1.7 1995/08/31 22:03:48 jtc Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1989, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * This code is derived from software contributed to Berkeley by |
| 9 | * Case Larsen. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * 3. Neither the name of the University nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | #include <ctype.h> |
| 37 | #include <err.h> |
| 38 | #include <limits.h> |
| 39 | #include <locale.h> |
| 40 | #include <stdio.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <string.h> |
| 43 | #include <strings.h> |
| 44 | #include <unistd.h> |
| 45 | #include <wchar.h> |
| 46 | #include <wctype.h> |
| 47 | |
| 48 | long long numchars, numfields; |
| 49 | unsigned long long repeats; |
| 50 | int cflag, dflag, iflag, uflag; |
| 51 | |
| 52 | void show(const char *); |
| 53 | char *skip(char *); |
| 54 | void obsolete(char *[]); |
| 55 | __dead__attribute__((__noreturn__)) void usage(void); |
| 56 | |
| 57 | int |
| 58 | main(int argc, char *argv[]) |
| 59 | { |
| 60 | const char *errstr; |
| 61 | char *p, *prevline, *t, *thisline, *tmp; |
| 62 | size_t prevsize, thissize, tmpsize; |
| 63 | ssize_t len; |
| 64 | int ch; |
| 65 | |
| 66 | setlocale(LC_CTYPE2, ""); |
| 67 | |
| 68 | if (pledge("stdio rpath wpath cpath", NULL((void *)0)) == -1) |
| 69 | err(1, "pledge"); |
| 70 | |
| 71 | obsolete(argv); |
| 72 | while ((ch = getopt(argc, argv, "cdf:is:u")) != -1) { |
| 73 | switch (ch) { |
| 74 | case 'c': |
| 75 | cflag = 1; |
| 76 | break; |
| 77 | case 'd': |
| 78 | dflag = 1; |
| 79 | break; |
| 80 | case 'f': |
| 81 | numfields = strtonum(optarg, 0, LLONG_MAX9223372036854775807LL, &errstr); |
| 82 | if (errstr) |
| 83 | errx(1, "fields is %s: %s", errstr, optarg); |
| 84 | break; |
| 85 | case 'i': |
| 86 | iflag = 1; |
| 87 | break; |
| 88 | case 's': |
| 89 | numchars = strtonum(optarg, 0, LLONG_MAX9223372036854775807LL, &errstr); |
| 90 | if (errstr) |
| 91 | errx(1, "chars is %s: %s", errstr, optarg); |
| 92 | break; |
| 93 | case 'u': |
| 94 | uflag = 1; |
| 95 | break; |
| 96 | default: |
| 97 | usage(); |
| 98 | } |
| 99 | } |
| 100 | argc -= optind; |
| 101 | argv += optind; |
| 102 | |
| 103 | /* If neither -d nor -u are set, default is -d -u. */ |
| 104 | if (!dflag && !uflag) |
| 105 | dflag = uflag = 1; |
| 106 | |
| 107 | if (argc > 2) |
| 108 | usage(); |
| 109 | if (argc >= 1 && strcmp(argv[0], "-") != 0) { |
| 110 | if (freopen(argv[0], "r", stdin(&__sF[0])) == NULL((void *)0)) |
| 111 | err(1, "%s", argv[0]); |
| 112 | } |
| 113 | if (argc == 2 && strcmp(argv[1], "-") != 0) { |
| 114 | if (freopen(argv[1], "w", stdout(&__sF[1])) == NULL((void *)0)) |
| 115 | err(1, "%s", argv[1]); |
| 116 | } |
| 117 | |
| 118 | if (pledge("stdio", NULL((void *)0)) == -1) |
| 119 | err(1, "pledge"); |
| 120 | |
| 121 | prevsize = 0; |
| 122 | prevline = NULL((void *)0); |
| 123 | if ((len = getline(&prevline, &prevsize, stdin(&__sF[0]))) == -1) { |
| 124 | free(prevline); |
| 125 | if (ferror(stdin)(!__isthreaded ? ((((&__sF[0]))->_flags & 0x0040) != 0) : (ferror)((&__sF[0])))) |
| 126 | err(1, "getline"); |
| 127 | return 0; |
| 128 | } |
| 129 | if (prevline[len - 1] == '\n') |
| 130 | prevline[len - 1] = '\0'; |
| 131 | if (numfields || numchars) |
| 132 | p = skip(prevline); |
| 133 | else |
| 134 | p = prevline; |
| 135 | |
| 136 | thissize = 0; |
| 137 | thisline = NULL((void *)0); |
| 138 | while ((len = getline(&thisline, &thissize, stdin(&__sF[0]))) != -1) { |
| 139 | if (thisline[len - 1] == '\n') |
| 140 | thisline[len - 1] = '\0'; |
| 141 | |
| 142 | /* If requested get the chosen fields + character offsets. */ |
| 143 | if (numfields || numchars) |
| 144 | t = skip(thisline); |
| 145 | else |
| 146 | t = thisline; |
| 147 | |
| 148 | /* If different, print; set previous to new value. */ |
| 149 | if ((iflag ? strcasecmp : strcmp)(p, t)) { |
| 150 | show(prevline); |
| 151 | tmp = prevline; |
| 152 | prevline = thisline; |
| 153 | thisline = tmp; |
| 154 | tmp = p; |
| 155 | p = t; |
| 156 | t = tmp; |
Value stored to 't' is never read | |
| 157 | tmpsize = prevsize; |
| 158 | prevsize = thissize; |
| 159 | thissize = tmpsize; |
| 160 | repeats = 0; |
| 161 | } else |
| 162 | ++repeats; |
| 163 | } |
| 164 | free(thisline); |
| 165 | if (ferror(stdin)(!__isthreaded ? ((((&__sF[0]))->_flags & 0x0040) != 0) : (ferror)((&__sF[0])))) |
| 166 | err(1, "getline"); |
| 167 | |
| 168 | show(prevline); |
| 169 | free(prevline); |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * show -- |
| 176 | * Output a line depending on the flags and number of repetitions |
| 177 | * of the line. |
| 178 | */ |
| 179 | void |
| 180 | show(const char *str) |
| 181 | { |
| 182 | if ((dflag && repeats) || (uflag && !repeats)) { |
| 183 | if (cflag) |
| 184 | printf("%4llu %s\n", repeats + 1, str); |
| 185 | else |
| 186 | printf("%s\n", str); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | char * |
| 191 | skip(char *str) |
| 192 | { |
| 193 | long long nchars, nfields; |
| 194 | wchar_t wc; |
| 195 | int len; |
| 196 | int field_started; |
| 197 | |
| 198 | for (nfields = numfields; nfields && *str; nfields--) { |
| 199 | /* Skip one field, including preceding blanks. */ |
| 200 | for (field_started = 0; *str != '\0'; str += len) { |
| 201 | if ((len = mbtowc(&wc, str, MB_CUR_MAX__mb_cur_max())) == -1) { |
| 202 | (void)mbtowc(NULL((void *)0), NULL((void *)0), MB_CUR_MAX__mb_cur_max()); |
| 203 | wc = L'?'; |
| 204 | len = 1; |
| 205 | } |
| 206 | if (iswblank(wc)) { |
| 207 | if (field_started) |
| 208 | break; |
| 209 | } else |
| 210 | field_started = 1; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | /* Skip some additional characters. */ |
| 215 | for (nchars = numchars; nchars-- && *str != '\0'; str += len) |
| 216 | if ((len = mblen(str, MB_CUR_MAX__mb_cur_max())) == -1) |
| 217 | len = 1; |
| 218 | |
| 219 | return (str); |
| 220 | } |
| 221 | |
| 222 | void |
| 223 | obsolete(char *argv[]) |
| 224 | { |
| 225 | size_t len; |
| 226 | char *ap, *p, *start; |
| 227 | |
| 228 | while ((ap = *++argv)) { |
| 229 | /* Return if "--" or not an option of any form. */ |
| 230 | if (ap[0] != '-') { |
| 231 | if (ap[0] != '+') |
| 232 | return; |
| 233 | } else if (ap[1] == '-') |
| 234 | return; |
| 235 | if (!isdigit((unsigned char)ap[1])) |
| 236 | continue; |
| 237 | /* |
| 238 | * Digit signifies an old-style option. Malloc space for dash, |
| 239 | * new option and argument. |
| 240 | */ |
| 241 | len = strlen(ap) + 3; |
| 242 | if ((start = p = malloc(len)) == NULL((void *)0)) |
| 243 | err(1, "malloc"); |
| 244 | *p++ = '-'; |
| 245 | *p++ = ap[0] == '+' ? 's' : 'f'; |
| 246 | (void)strlcpy(p, ap + 1, len - 2); |
| 247 | *argv = start; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | __dead__attribute__((__noreturn__)) void |
| 252 | usage(void) |
| 253 | { |
| 254 | fprintf(stderr(&__sF[2]), |
| 255 | "usage: %s [-ci] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n", |
| 256 | getprogname()); |
| 257 | exit(1); |
| 258 | } |