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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static const char copyright[] = 39 "@(#) Copyright (c) 1989, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95"; 46 #endif 47 static const char rcsid[] = 48 "$Id: uniq.c,v 1.3 1997/08/21 06:51:10 charnier Exp $"; 49 #endif /* not lint */ 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #define MAXLINELEN (8 * 1024) 59 60 int cflag, dflag, uflag; 61 int numchars, numfields, repeats; 62 63 FILE *file __P((char *, char *)); 64 void show __P((FILE *, char *)); 65 char *skip __P((char *)); 66 void obsolete __P((char *[])); 67 static void usage __P((void)); 68 69 int 70 main (argc, argv) 71 int argc; 72 char *argv[]; 73 { 74 register char *t1, *t2; 75 FILE *ifp, *ofp; 76 int ch; 77 char *prevline, *thisline, *p; 78 int iflag = 0, comp; 79 80 obsolete(argv); 81 while ((ch = getopt(argc, argv, "-cdif:s:u")) != -1) 82 switch (ch) { 83 case '-': 84 --optind; 85 goto done; 86 case 'c': 87 cflag = 1; 88 break; 89 case 'd': 90 dflag = 1; 91 break; 92 case 'i': 93 iflag = 1; 94 break; 95 case 'f': 96 numfields = strtol(optarg, &p, 10); 97 if (numfields < 0 || *p) 98 errx(1, "illegal field skip value: %s", optarg); 99 break; 100 case 's': 101 numchars = strtol(optarg, &p, 10); 102 if (numchars < 0 || *p) 103 errx(1, "illegal character skip value: %s", optarg); 104 break; 105 case 'u': 106 uflag = 1; 107 break; 108 case '?': 109 default: 110 usage(); 111 } 112 113 done: argc -= optind; 114 argv +=optind; 115 116 /* If no flags are set, default is -d -u. */ 117 if (cflag) { 118 if (dflag || uflag) 119 usage(); 120 } else if (!dflag && !uflag) 121 dflag = uflag = 1; 122 123 switch(argc) { 124 case 0: 125 ifp = stdin; 126 ofp = stdout; 127 break; 128 case 1: 129 ifp = file(argv[0], "r"); 130 ofp = stdout; 131 break; 132 case 2: 133 ifp = file(argv[0], "r"); 134 ofp = file(argv[1], "w"); 135 break; 136 default: 137 usage(); 138 } 139 140 prevline = malloc(MAXLINELEN); 141 thisline = malloc(MAXLINELEN); 142 if (prevline == NULL || thisline == NULL) 143 errx(1, "malloc"); 144 145 if (fgets(prevline, MAXLINELEN, ifp) == NULL) 146 exit(0); 147 148 while (fgets(thisline, MAXLINELEN, ifp)) { 149 /* If requested get the chosen fields + character offsets. */ 150 if (numfields || numchars) { 151 t1 = skip(thisline); 152 t2 = skip(prevline); 153 } else { 154 t1 = thisline; 155 t2 = prevline; 156 } 157 158 /* If different, print; set previous to new value. */ 159 if (iflag) 160 comp = strcasecmp(t1, t2); 161 else 162 comp = strcmp(t1, t2); 163 164 if (comp) { 165 show(ofp, prevline); 166 t1 = prevline; 167 prevline = thisline; 168 thisline = t1; 169 repeats = 0; 170 } else 171 ++repeats; 172 } 173 show(ofp, prevline); 174 exit(0); 175 } 176 177 /* 178 * show -- 179 * Output a line depending on the flags and number of repetitions 180 * of the line. 181 */ 182 void 183 show(ofp, str) 184 FILE *ofp; 185 char *str; 186 { 187 188 if (cflag && *str) 189 (void)fprintf(ofp, "%4d %s", repeats + 1, str); 190 if ((dflag && repeats) || (uflag && !repeats)) 191 (void)fprintf(ofp, "%s", str); 192 } 193 194 char * 195 skip(str) 196 register char *str; 197 { 198 register int infield, nchars, nfields; 199 200 for (nfields = numfields, infield = 0; nfields && *str; ++str) 201 if (isspace(*str)) { 202 if (infield) { 203 infield = 0; 204 --nfields; 205 } 206 } else if (!infield) 207 infield = 1; 208 for (nchars = numchars; nchars-- && *str; ++str); 209 return(str); 210 } 211 212 FILE * 213 file(name, mode) 214 char *name, *mode; 215 { 216 FILE *fp; 217 218 if ((fp = fopen(name, mode)) == NULL) 219 err(1, "%s", name); 220 return(fp); 221 } 222 223 void 224 obsolete(argv) 225 char *argv[]; 226 { 227 int len; 228 char *ap, *p, *start; 229 230 while ((ap = *++argv)) { 231 /* Return if "--" or not an option of any form. */ 232 if (ap[0] != '-') { 233 if (ap[0] != '+') 234 return; 235 } else if (ap[1] == '-') 236 return; 237 if (!isdigit(ap[1])) 238 continue; 239 /* 240 * Digit signifies an old-style option. Malloc space for dash, 241 * new option and argument. 242 */ 243 len = strlen(ap); 244 if ((start = p = malloc(len + 3)) == NULL) 245 errx(1, "malloc"); 246 *p++ = '-'; 247 *p++ = ap[0] == '+' ? 's' : 'f'; 248 (void)strcpy(p, ap + 1); 249 *argv = start; 250 } 251 } 252 253 static void 254 usage() 255 { 256 (void)fprintf(stderr, 257 "usage: uniq [-c | -du | -i] [-f fields] [-s chars] [input [output]]\n"); 258 exit(1); 259 } 260