Annotation of src/usr.bin/uniq/uniq.c, Revision 1.13
1.13 ! deraadt 1: /* $OpenBSD: uniq.c,v 1.12 2002/12/08 22:43:54 millert 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.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: static char copyright[] =
42: "@(#) Copyright (c) 1989, 1993\n\
43: The Regents of the University of California. All rights reserved.\n";
44: #endif /* not lint */
45:
46: #ifndef lint
47: #if 0
48: static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95";
49: #endif
1.13 ! deraadt 50: static char rcsid[] = "$OpenBSD: uniq.c,v 1.12 2002/12/08 22:43:54 millert Exp $";
1.1 deraadt 51: #endif /* not lint */
52:
53: #include <errno.h>
54: #include <stdio.h>
55: #include <ctype.h>
56: #include <stdlib.h>
57: #include <string.h>
58: #include <unistd.h>
1.5 mickey 59: #include <err.h>
1.1 deraadt 60:
61: #define MAXLINELEN (8 * 1024)
62:
63: int cflag, dflag, uflag;
64: int numchars, numfields, repeats;
65:
1.9 millert 66: FILE *file(char *, char *);
67: void show(FILE *, char *);
68: char *skip(char *);
69: void obsolete(char *[]);
70: void usage(void);
1.1 deraadt 71:
72: int
1.10 deraadt 73: main(int argc, char *argv[])
1.1 deraadt 74: {
1.8 mpech 75: char *t1, *t2;
1.10 deraadt 76: FILE *ifp = NULL, *ofp = NULL;
1.1 deraadt 77: int ch;
78: char *prevline, *thisline, *p;
79:
80: obsolete(argv);
1.11 millert 81: while ((ch = getopt(argc, argv, "cdf:s:u")) != -1)
1.1 deraadt 82: switch (ch) {
83: case 'c':
84: cflag = 1;
85: break;
86: case 'd':
87: dflag = 1;
88: break;
89: case 'f':
90: numfields = strtol(optarg, &p, 10);
91: if (numfields < 0 || *p)
1.5 mickey 92: errx(1, "illegal field skip value: %s", optarg);
1.1 deraadt 93: break;
94: case 's':
95: numchars = strtol(optarg, &p, 10);
96: if (numchars < 0 || *p)
1.5 mickey 97: errx(1, "illegal character skip value: %s", optarg);
1.1 deraadt 98: break;
99: case 'u':
100: uflag = 1;
101: break;
102: case '?':
103: default:
104: usage();
105: }
106:
1.11 millert 107: argc -= optind;
1.1 deraadt 108: argv +=optind;
109:
110: /* If no flags are set, default is -d -u. */
111: if (cflag) {
112: if (dflag || uflag)
113: usage();
114: } else if (!dflag && !uflag)
115: dflag = uflag = 1;
116:
117: switch(argc) {
118: case 0:
119: ifp = stdin;
120: ofp = stdout;
121: break;
122: case 1:
123: ifp = file(argv[0], "r");
124: ofp = stdout;
125: break;
126: case 2:
127: ifp = file(argv[0], "r");
128: ofp = file(argv[1], "w");
129: break;
130: default:
131: usage();
132: }
133:
134: prevline = malloc(MAXLINELEN);
135: thisline = malloc(MAXLINELEN);
136: if (prevline == NULL || thisline == NULL)
1.5 mickey 137: err(1, "malloc");
1.1 deraadt 138:
139: if (fgets(prevline, MAXLINELEN, ifp) == NULL)
140: exit(0);
141:
142: while (fgets(thisline, MAXLINELEN, ifp)) {
143: /* If requested get the chosen fields + character offsets. */
144: if (numfields || numchars) {
145: t1 = skip(thisline);
146: t2 = skip(prevline);
147: } else {
148: t1 = thisline;
149: t2 = prevline;
150: }
151:
152: /* If different, print; set previous to new value. */
153: if (strcmp(t1, t2)) {
154: show(ofp, prevline);
155: t1 = prevline;
156: prevline = thisline;
157: thisline = t1;
158: repeats = 0;
159: } else
160: ++repeats;
161: }
162: show(ofp, prevline);
163: exit(0);
164: }
165:
166: /*
167: * show --
168: * Output a line depending on the flags and number of repetitions
169: * of the line.
170: */
171: void
1.10 deraadt 172: show(FILE *ofp, char *str)
1.1 deraadt 173: {
174:
175: if (cflag && *str)
176: (void)fprintf(ofp, "%4d %s", repeats + 1, str);
177: if (dflag && repeats || uflag && !repeats)
178: (void)fprintf(ofp, "%s", str);
179: }
180:
181: char *
1.10 deraadt 182: skip(char *str)
1.1 deraadt 183: {
1.8 mpech 184: int infield, nchars, nfields;
1.1 deraadt 185:
186: for (nfields = numfields, infield = 0; nfields && *str; ++str)
187: if (isspace(*str)) {
188: if (infield) {
189: infield = 0;
190: --nfields;
191: }
192: } else if (!infield)
193: infield = 1;
194: for (nchars = numchars; nchars-- && *str; ++str);
195: return(str);
196: }
197:
198: FILE *
1.10 deraadt 199: file(char *name, char *mode)
1.1 deraadt 200: {
201: FILE *fp;
202:
1.12 millert 203: if (strcmp(name, "-") == 0)
204: return(*mode == 'r' ? stdin : stdout);
1.1 deraadt 205: if ((fp = fopen(name, mode)) == NULL)
1.6 millert 206: err(1, "%s", name);
1.1 deraadt 207: return(fp);
208: }
209:
210: void
1.10 deraadt 211: obsolete(char *argv[])
1.1 deraadt 212: {
213: int len;
214: char *ap, *p, *start;
215:
1.7 deraadt 216: while ((ap = *++argv)) {
1.1 deraadt 217: /* Return if "--" or not an option of any form. */
218: if (ap[0] != '-') {
219: if (ap[0] != '+')
220: return;
221: } else if (ap[1] == '-')
222: return;
223: if (!isdigit(ap[1]))
224: continue;
225: /*
226: * Digit signifies an old-style option. Malloc space for dash,
227: * new option and argument.
228: */
1.13 ! deraadt 229: len = strlen(ap) + 3;
! 230: if ((start = p = malloc(len)) == NULL)
1.5 mickey 231: err(1, "malloc");
1.1 deraadt 232: *p++ = '-';
233: *p++ = ap[0] == '+' ? 's' : 'f';
1.13 ! deraadt 234: (void)strlcpy(p, ap + 1, len - 2);
1.1 deraadt 235: *argv = start;
236: }
237: }
238:
239: void
1.10 deraadt 240: usage(void)
1.1 deraadt 241: {
242: (void)fprintf(stderr,
243: "usage: uniq [-c | -du] [-f fields] [-s chars] [input [output]]\n");
244: exit(1);
245: }
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