Annotation of src/usr.bin/uniq/uniq.c, Revision 1.21
1.21 ! deraadt 1: /* $OpenBSD: uniq.c,v 1.20 2015/10/03 02:18:20 deraadt 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:
1.15 ray 36: #include <ctype.h>
37: #include <err.h>
1.1 deraadt 38: #include <errno.h>
1.15 ray 39: #include <limits.h>
1.1 deraadt 40: #include <stdio.h>
41: #include <stdlib.h>
42: #include <string.h>
43: #include <unistd.h>
44:
45: #define MAXLINELEN (8 * 1024)
46:
47: int cflag, dflag, uflag;
48: int numchars, numfields, repeats;
49:
1.9 millert 50: FILE *file(char *, char *);
51: void show(FILE *, char *);
52: char *skip(char *);
53: void obsolete(char *[]);
1.15 ray 54: __dead void usage(void);
1.1 deraadt 55:
56: int
1.10 deraadt 57: main(int argc, char *argv[])
1.1 deraadt 58: {
1.8 mpech 59: char *t1, *t2;
1.10 deraadt 60: FILE *ifp = NULL, *ofp = NULL;
1.1 deraadt 61: int ch;
1.15 ray 62: char *prevline, *thisline;
1.1 deraadt 63:
1.20 deraadt 64: if (tame("stdio rpath wpath cpath", NULL) == -1)
65: err(1, "tame");
66:
1.1 deraadt 67: obsolete(argv);
1.15 ray 68: while ((ch = getopt(argc, argv, "cdf:s:u")) != -1) {
69: const char *errstr;
70:
1.1 deraadt 71: switch (ch) {
72: case 'c':
73: cflag = 1;
74: break;
75: case 'd':
76: dflag = 1;
77: break;
78: case 'f':
1.15 ray 79: numfields = (int)strtonum(optarg, 0, INT_MAX,
80: &errstr);
81: if (errstr)
82: errx(1, "field skip value is %s: %s",
83: errstr, optarg);
1.1 deraadt 84: break;
85: case 's':
1.15 ray 86: numchars = (int)strtonum(optarg, 0, INT_MAX,
87: &errstr);
88: if (errstr)
89: errx(1,
90: "character skip value is %s: %s",
91: errstr, optarg);
1.1 deraadt 92: break;
93: case 'u':
94: uflag = 1;
95: break;
96: default:
97: usage();
1.15 ray 98: }
1.1 deraadt 99: }
100:
1.11 millert 101: argc -= optind;
1.15 ray 102: argv += optind;
1.1 deraadt 103:
1.16 kili 104: /* If neither -d nor -u are set, default is -d -u. */
105: if (!dflag && !uflag)
1.1 deraadt 106: dflag = uflag = 1;
107:
108: switch(argc) {
109: case 0:
110: ifp = stdin;
111: ofp = stdout;
112: break;
113: case 1:
114: ifp = file(argv[0], "r");
115: ofp = stdout;
116: break;
117: case 2:
118: ifp = file(argv[0], "r");
119: ofp = file(argv[1], "w");
120: break;
121: default:
122: usage();
123: }
1.20 deraadt 124:
1.21 ! deraadt 125: if (tame("stdio", NULL) == -1)
1.20 deraadt 126: err(1, "tame");
1.1 deraadt 127:
128: prevline = malloc(MAXLINELEN);
129: thisline = malloc(MAXLINELEN);
130: if (prevline == NULL || thisline == NULL)
1.5 mickey 131: err(1, "malloc");
1.1 deraadt 132:
133: if (fgets(prevline, MAXLINELEN, ifp) == NULL)
134: exit(0);
135:
136: while (fgets(thisline, MAXLINELEN, ifp)) {
137: /* If requested get the chosen fields + character offsets. */
138: if (numfields || numchars) {
139: t1 = skip(thisline);
140: t2 = skip(prevline);
141: } else {
142: t1 = thisline;
143: t2 = prevline;
144: }
145:
146: /* If different, print; set previous to new value. */
147: if (strcmp(t1, t2)) {
148: show(ofp, prevline);
149: t1 = prevline;
150: prevline = thisline;
151: thisline = t1;
152: repeats = 0;
153: } else
154: ++repeats;
155: }
156: show(ofp, prevline);
157: exit(0);
158: }
159:
160: /*
161: * show --
162: * Output a line depending on the flags and number of repetitions
163: * of the line.
164: */
165: void
1.10 deraadt 166: show(FILE *ofp, char *str)
1.1 deraadt 167: {
1.16 kili 168: if ((dflag && repeats) || (uflag && !repeats)) {
169: if (cflag)
170: (void)fprintf(ofp, "%4d %s", repeats + 1, str);
171: else
172: (void)fprintf(ofp, "%s", str);
173: }
1.1 deraadt 174: }
175:
176: char *
1.10 deraadt 177: skip(char *str)
1.1 deraadt 178: {
1.16 kili 179: int nchars, nfields;
1.1 deraadt 180:
1.16 kili 181: for (nfields = numfields; nfields && *str; nfields--) {
1.19 deraadt 182: while (isblank((unsigned char)*str))
1.16 kili 183: str++;
1.19 deraadt 184: while (*str && !isblank((unsigned char)*str))
1.16 kili 185: str++;
186: }
187: for (nchars = numchars; nchars-- && *str && *str != '\n'; ++str)
1.15 ray 188: ;
189: return (str);
1.1 deraadt 190: }
191:
192: FILE *
1.10 deraadt 193: file(char *name, char *mode)
1.1 deraadt 194: {
195: FILE *fp;
196:
1.12 millert 197: if (strcmp(name, "-") == 0)
198: return(*mode == 'r' ? stdin : stdout);
1.1 deraadt 199: if ((fp = fopen(name, mode)) == NULL)
1.6 millert 200: err(1, "%s", name);
1.15 ray 201: return (fp);
1.1 deraadt 202: }
203:
204: void
1.10 deraadt 205: obsolete(char *argv[])
1.1 deraadt 206: {
1.15 ray 207: size_t len;
1.1 deraadt 208: char *ap, *p, *start;
209:
1.7 deraadt 210: while ((ap = *++argv)) {
1.1 deraadt 211: /* Return if "--" or not an option of any form. */
212: if (ap[0] != '-') {
213: if (ap[0] != '+')
214: return;
215: } else if (ap[1] == '-')
216: return;
217: if (!isdigit(ap[1]))
218: continue;
219: /*
220: * Digit signifies an old-style option. Malloc space for dash,
221: * new option and argument.
222: */
1.13 deraadt 223: len = strlen(ap) + 3;
224: if ((start = p = malloc(len)) == NULL)
1.5 mickey 225: err(1, "malloc");
1.1 deraadt 226: *p++ = '-';
227: *p++ = ap[0] == '+' ? 's' : 'f';
1.13 deraadt 228: (void)strlcpy(p, ap + 1, len - 2);
1.1 deraadt 229: *argv = start;
230: }
231: }
232:
1.15 ray 233: __dead void
1.10 deraadt 234: usage(void)
1.1 deraadt 235: {
1.15 ray 236: extern char *__progname;
1.16 kili 237:
1.1 deraadt 238: (void)fprintf(stderr,
1.17 kili 239: "usage: %s [-c] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
1.15 ray 240: __progname);
1.1 deraadt 241: exit(1);
242: }
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