Annotation of src/usr.bin/uniq/uniq.c, Revision 1.19
1.19 ! deraadt 1: /* $OpenBSD: uniq.c,v 1.18 2009/10/27 23:59:46 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:
64: obsolete(argv);
1.15 ray 65: while ((ch = getopt(argc, argv, "cdf:s:u")) != -1) {
66: const char *errstr;
67:
1.1 deraadt 68: switch (ch) {
69: case 'c':
70: cflag = 1;
71: break;
72: case 'd':
73: dflag = 1;
74: break;
75: case 'f':
1.15 ray 76: numfields = (int)strtonum(optarg, 0, INT_MAX,
77: &errstr);
78: if (errstr)
79: errx(1, "field skip value is %s: %s",
80: errstr, optarg);
1.1 deraadt 81: break;
82: case 's':
1.15 ray 83: numchars = (int)strtonum(optarg, 0, INT_MAX,
84: &errstr);
85: if (errstr)
86: errx(1,
87: "character skip value is %s: %s",
88: errstr, optarg);
1.1 deraadt 89: break;
90: case 'u':
91: uflag = 1;
92: break;
93: default:
94: usage();
1.15 ray 95: }
1.1 deraadt 96: }
97:
1.11 millert 98: argc -= optind;
1.15 ray 99: argv += optind;
1.1 deraadt 100:
1.16 kili 101: /* If neither -d nor -u are set, default is -d -u. */
102: if (!dflag && !uflag)
1.1 deraadt 103: dflag = uflag = 1;
104:
105: switch(argc) {
106: case 0:
107: ifp = stdin;
108: ofp = stdout;
109: break;
110: case 1:
111: ifp = file(argv[0], "r");
112: ofp = stdout;
113: break;
114: case 2:
115: ifp = file(argv[0], "r");
116: ofp = file(argv[1], "w");
117: break;
118: default:
119: usage();
120: }
121:
122: prevline = malloc(MAXLINELEN);
123: thisline = malloc(MAXLINELEN);
124: if (prevline == NULL || thisline == NULL)
1.5 mickey 125: err(1, "malloc");
1.1 deraadt 126:
127: if (fgets(prevline, MAXLINELEN, ifp) == NULL)
128: exit(0);
129:
130: while (fgets(thisline, MAXLINELEN, ifp)) {
131: /* If requested get the chosen fields + character offsets. */
132: if (numfields || numchars) {
133: t1 = skip(thisline);
134: t2 = skip(prevline);
135: } else {
136: t1 = thisline;
137: t2 = prevline;
138: }
139:
140: /* If different, print; set previous to new value. */
141: if (strcmp(t1, t2)) {
142: show(ofp, prevline);
143: t1 = prevline;
144: prevline = thisline;
145: thisline = t1;
146: repeats = 0;
147: } else
148: ++repeats;
149: }
150: show(ofp, prevline);
151: exit(0);
152: }
153:
154: /*
155: * show --
156: * Output a line depending on the flags and number of repetitions
157: * of the line.
158: */
159: void
1.10 deraadt 160: show(FILE *ofp, char *str)
1.1 deraadt 161: {
1.16 kili 162: if ((dflag && repeats) || (uflag && !repeats)) {
163: if (cflag)
164: (void)fprintf(ofp, "%4d %s", repeats + 1, str);
165: else
166: (void)fprintf(ofp, "%s", str);
167: }
1.1 deraadt 168: }
169:
170: char *
1.10 deraadt 171: skip(char *str)
1.1 deraadt 172: {
1.16 kili 173: int nchars, nfields;
1.1 deraadt 174:
1.16 kili 175: for (nfields = numfields; nfields && *str; nfields--) {
1.19 ! deraadt 176: while (isblank((unsigned char)*str))
1.16 kili 177: str++;
1.19 ! deraadt 178: while (*str && !isblank((unsigned char)*str))
1.16 kili 179: str++;
180: }
181: for (nchars = numchars; nchars-- && *str && *str != '\n'; ++str)
1.15 ray 182: ;
183: return (str);
1.1 deraadt 184: }
185:
186: FILE *
1.10 deraadt 187: file(char *name, char *mode)
1.1 deraadt 188: {
189: FILE *fp;
190:
1.12 millert 191: if (strcmp(name, "-") == 0)
192: return(*mode == 'r' ? stdin : stdout);
1.1 deraadt 193: if ((fp = fopen(name, mode)) == NULL)
1.6 millert 194: err(1, "%s", name);
1.15 ray 195: return (fp);
1.1 deraadt 196: }
197:
198: void
1.10 deraadt 199: obsolete(char *argv[])
1.1 deraadt 200: {
1.15 ray 201: size_t len;
1.1 deraadt 202: char *ap, *p, *start;
203:
1.7 deraadt 204: while ((ap = *++argv)) {
1.1 deraadt 205: /* Return if "--" or not an option of any form. */
206: if (ap[0] != '-') {
207: if (ap[0] != '+')
208: return;
209: } else if (ap[1] == '-')
210: return;
211: if (!isdigit(ap[1]))
212: continue;
213: /*
214: * Digit signifies an old-style option. Malloc space for dash,
215: * new option and argument.
216: */
1.13 deraadt 217: len = strlen(ap) + 3;
218: if ((start = p = malloc(len)) == NULL)
1.5 mickey 219: err(1, "malloc");
1.1 deraadt 220: *p++ = '-';
221: *p++ = ap[0] == '+' ? 's' : 'f';
1.13 deraadt 222: (void)strlcpy(p, ap + 1, len - 2);
1.1 deraadt 223: *argv = start;
224: }
225: }
226:
1.15 ray 227: __dead void
1.10 deraadt 228: usage(void)
1.1 deraadt 229: {
1.15 ray 230: extern char *__progname;
1.16 kili 231:
1.1 deraadt 232: (void)fprintf(stderr,
1.17 kili 233: "usage: %s [-c] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
1.15 ray 234: __progname);
1.1 deraadt 235: exit(1);
236: }
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