Annotation of src/usr.bin/uniq/uniq.c, Revision 1.16
1.16 ! kili 1: /* $OpenBSD: uniq.c,v 1.15 2006/04/07 05:10:02 ray Exp $ */
1.1 deraadt 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.
1.14 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1989, 1993\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95";
45: #endif
1.16 ! kili 46: static char rcsid[] = "$OpenBSD: uniq.c,v 1.15 2006/04/07 05:10:02 ray Exp $";
1.1 deraadt 47: #endif /* not lint */
48:
1.15 ray 49: #include <ctype.h>
50: #include <err.h>
1.1 deraadt 51: #include <errno.h>
1.15 ray 52: #include <limits.h>
1.1 deraadt 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:
1.9 millert 63: FILE *file(char *, char *);
64: void show(FILE *, char *);
65: char *skip(char *);
66: void obsolete(char *[]);
1.15 ray 67: __dead void usage(void);
1.1 deraadt 68:
69: int
1.10 deraadt 70: main(int argc, char *argv[])
1.1 deraadt 71: {
1.8 mpech 72: char *t1, *t2;
1.10 deraadt 73: FILE *ifp = NULL, *ofp = NULL;
1.1 deraadt 74: int ch;
1.15 ray 75: char *prevline, *thisline;
1.1 deraadt 76:
77: obsolete(argv);
1.15 ray 78: while ((ch = getopt(argc, argv, "cdf:s:u")) != -1) {
79: const char *errstr;
80:
1.1 deraadt 81: switch (ch) {
82: case 'c':
83: cflag = 1;
84: break;
85: case 'd':
86: dflag = 1;
87: break;
88: case 'f':
1.15 ray 89: numfields = (int)strtonum(optarg, 0, INT_MAX,
90: &errstr);
91: if (errstr)
92: errx(1, "field skip value is %s: %s",
93: errstr, optarg);
1.1 deraadt 94: break;
95: case 's':
1.15 ray 96: numchars = (int)strtonum(optarg, 0, INT_MAX,
97: &errstr);
98: if (errstr)
99: errx(1,
100: "character skip value is %s: %s",
101: errstr, optarg);
1.1 deraadt 102: break;
103: case 'u':
104: uflag = 1;
105: break;
106: default:
107: usage();
1.15 ray 108: }
1.1 deraadt 109: }
110:
1.11 millert 111: argc -= optind;
1.15 ray 112: argv += optind;
1.1 deraadt 113:
1.16 ! kili 114: /* If neither -d nor -u are set, default is -d -u. */
! 115: if (!dflag && !uflag)
1.1 deraadt 116: dflag = uflag = 1;
117:
118: switch(argc) {
119: case 0:
120: ifp = stdin;
121: ofp = stdout;
122: break;
123: case 1:
124: ifp = file(argv[0], "r");
125: ofp = stdout;
126: break;
127: case 2:
128: ifp = file(argv[0], "r");
129: ofp = file(argv[1], "w");
130: break;
131: default:
132: usage();
133: }
134:
135: prevline = malloc(MAXLINELEN);
136: thisline = malloc(MAXLINELEN);
137: if (prevline == NULL || thisline == NULL)
1.5 mickey 138: err(1, "malloc");
1.1 deraadt 139:
140: if (fgets(prevline, MAXLINELEN, ifp) == NULL)
141: exit(0);
142:
143: while (fgets(thisline, MAXLINELEN, ifp)) {
144: /* If requested get the chosen fields + character offsets. */
145: if (numfields || numchars) {
146: t1 = skip(thisline);
147: t2 = skip(prevline);
148: } else {
149: t1 = thisline;
150: t2 = prevline;
151: }
152:
153: /* If different, print; set previous to new value. */
154: if (strcmp(t1, t2)) {
155: show(ofp, prevline);
156: t1 = prevline;
157: prevline = thisline;
158: thisline = t1;
159: repeats = 0;
160: } else
161: ++repeats;
162: }
163: show(ofp, prevline);
164: exit(0);
165: }
166:
167: /*
168: * show --
169: * Output a line depending on the flags and number of repetitions
170: * of the line.
171: */
172: void
1.10 deraadt 173: show(FILE *ofp, char *str)
1.1 deraadt 174: {
1.16 ! kili 175: if ((dflag && repeats) || (uflag && !repeats)) {
! 176: if (cflag)
! 177: (void)fprintf(ofp, "%4d %s", repeats + 1, str);
! 178: else
! 179: (void)fprintf(ofp, "%s", str);
! 180: }
1.1 deraadt 181: }
182:
183: char *
1.10 deraadt 184: skip(char *str)
1.1 deraadt 185: {
1.16 ! kili 186: int nchars, nfields;
1.1 deraadt 187:
1.16 ! kili 188: for (nfields = numfields; nfields && *str; nfields--) {
! 189: while (isblank(*str))
! 190: str++;
! 191: while (*str && !isblank(*str))
! 192: str++;
! 193: }
! 194: for (nchars = numchars; nchars-- && *str && *str != '\n'; ++str)
1.15 ray 195: ;
196: return (str);
1.1 deraadt 197: }
198:
199: FILE *
1.10 deraadt 200: file(char *name, char *mode)
1.1 deraadt 201: {
202: FILE *fp;
203:
1.12 millert 204: if (strcmp(name, "-") == 0)
205: return(*mode == 'r' ? stdin : stdout);
1.1 deraadt 206: if ((fp = fopen(name, mode)) == NULL)
1.6 millert 207: err(1, "%s", name);
1.15 ray 208: return (fp);
1.1 deraadt 209: }
210:
211: void
1.10 deraadt 212: obsolete(char *argv[])
1.1 deraadt 213: {
1.15 ray 214: size_t len;
1.1 deraadt 215: char *ap, *p, *start;
216:
1.7 deraadt 217: while ((ap = *++argv)) {
1.1 deraadt 218: /* Return if "--" or not an option of any form. */
219: if (ap[0] != '-') {
220: if (ap[0] != '+')
221: return;
222: } else if (ap[1] == '-')
223: return;
224: if (!isdigit(ap[1]))
225: continue;
226: /*
227: * Digit signifies an old-style option. Malloc space for dash,
228: * new option and argument.
229: */
1.13 deraadt 230: len = strlen(ap) + 3;
231: if ((start = p = malloc(len)) == NULL)
1.5 mickey 232: err(1, "malloc");
1.1 deraadt 233: *p++ = '-';
234: *p++ = ap[0] == '+' ? 's' : 'f';
1.13 deraadt 235: (void)strlcpy(p, ap + 1, len - 2);
1.1 deraadt 236: *argv = start;
237: }
238: }
239:
1.15 ray 240: __dead void
1.10 deraadt 241: usage(void)
1.1 deraadt 242: {
1.15 ray 243: extern char *__progname;
1.16 ! kili 244:
1.1 deraadt 245: (void)fprintf(stderr,
1.15 ray 246: "usage: %s [-c | -d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
247: __progname);
1.1 deraadt 248: exit(1);
249: }
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