Annotation of src/usr.bin/uniq/uniq.c, Revision 1.25
1.25 ! tb 1: /* $OpenBSD: uniq.c,v 1.24 2015/12/19 10:21:01 schwarze 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>
1.24 schwarze 40: #include <locale.h>
1.1 deraadt 41: #include <stdio.h>
42: #include <stdlib.h>
43: #include <string.h>
44: #include <unistd.h>
1.24 schwarze 45: #include <wchar.h>
46: #include <wctype.h>
1.1 deraadt 47:
48: #define MAXLINELEN (8 * 1024)
49:
1.25 ! tb 50: int cflag, dflag, iflag, uflag;
1.1 deraadt 51: int numchars, numfields, repeats;
52:
1.9 millert 53: FILE *file(char *, char *);
54: void show(FILE *, char *);
55: char *skip(char *);
56: void obsolete(char *[]);
1.15 ray 57: __dead void usage(void);
1.1 deraadt 58:
59: int
1.10 deraadt 60: main(int argc, char *argv[])
1.1 deraadt 61: {
1.8 mpech 62: char *t1, *t2;
1.10 deraadt 63: FILE *ifp = NULL, *ofp = NULL;
1.1 deraadt 64: int ch;
1.15 ray 65: char *prevline, *thisline;
1.1 deraadt 66:
1.24 schwarze 67: setlocale(LC_CTYPE, "");
68:
1.22 deraadt 69: if (pledge("stdio rpath wpath cpath", NULL) == -1)
70: err(1, "pledge");
1.20 deraadt 71:
1.1 deraadt 72: obsolete(argv);
1.25 ! tb 73: while ((ch = getopt(argc, argv, "cdf:is:u")) != -1) {
1.15 ray 74: const char *errstr;
75:
1.1 deraadt 76: switch (ch) {
77: case 'c':
78: cflag = 1;
79: break;
80: case 'd':
81: dflag = 1;
82: break;
83: case 'f':
1.15 ray 84: numfields = (int)strtonum(optarg, 0, INT_MAX,
85: &errstr);
86: if (errstr)
87: errx(1, "field skip value is %s: %s",
88: errstr, optarg);
1.1 deraadt 89: break;
1.25 ! tb 90: case 'i':
! 91: iflag = 1;
! 92: break;
1.1 deraadt 93: case 's':
1.15 ray 94: numchars = (int)strtonum(optarg, 0, INT_MAX,
95: &errstr);
96: if (errstr)
97: errx(1,
98: "character skip value is %s: %s",
99: errstr, optarg);
1.1 deraadt 100: break;
101: case 'u':
102: uflag = 1;
103: break;
104: default:
105: usage();
1.15 ray 106: }
1.1 deraadt 107: }
108:
1.11 millert 109: argc -= optind;
1.15 ray 110: argv += optind;
1.1 deraadt 111:
1.16 kili 112: /* If neither -d nor -u are set, default is -d -u. */
113: if (!dflag && !uflag)
1.1 deraadt 114: dflag = uflag = 1;
115:
116: switch(argc) {
117: case 0:
118: ifp = stdin;
119: ofp = stdout;
120: break;
121: case 1:
122: ifp = file(argv[0], "r");
123: ofp = stdout;
124: break;
125: case 2:
126: ifp = file(argv[0], "r");
127: ofp = file(argv[1], "w");
128: break;
129: default:
130: usage();
131: }
1.20 deraadt 132:
1.22 deraadt 133: if (pledge("stdio", NULL) == -1)
134: err(1, "pledge");
1.1 deraadt 135:
136: prevline = malloc(MAXLINELEN);
137: thisline = malloc(MAXLINELEN);
138: if (prevline == NULL || thisline == NULL)
1.5 mickey 139: err(1, "malloc");
1.1 deraadt 140:
141: if (fgets(prevline, MAXLINELEN, ifp) == NULL)
142: exit(0);
143:
144: while (fgets(thisline, MAXLINELEN, ifp)) {
145: /* If requested get the chosen fields + character offsets. */
146: if (numfields || numchars) {
147: t1 = skip(thisline);
148: t2 = skip(prevline);
149: } else {
150: t1 = thisline;
151: t2 = prevline;
152: }
153:
154: /* If different, print; set previous to new value. */
1.25 ! tb 155: if ((!iflag && strcmp(t1, t2)) || strcasecmp(t1, t2)) {
1.1 deraadt 156: show(ofp, prevline);
157: t1 = prevline;
158: prevline = thisline;
159: thisline = t1;
160: repeats = 0;
161: } else
162: ++repeats;
163: }
164: show(ofp, prevline);
165: exit(0);
166: }
167:
168: /*
169: * show --
170: * Output a line depending on the flags and number of repetitions
171: * of the line.
172: */
173: void
1.10 deraadt 174: show(FILE *ofp, char *str)
1.1 deraadt 175: {
1.16 kili 176: if ((dflag && repeats) || (uflag && !repeats)) {
177: if (cflag)
178: (void)fprintf(ofp, "%4d %s", repeats + 1, str);
179: else
180: (void)fprintf(ofp, "%s", str);
181: }
1.1 deraadt 182: }
183:
184: char *
1.10 deraadt 185: skip(char *str)
1.1 deraadt 186: {
1.24 schwarze 187: wchar_t wc;
1.16 kili 188: int nchars, nfields;
1.24 schwarze 189: int len;
190: int field_started;
1.1 deraadt 191:
1.16 kili 192: for (nfields = numfields; nfields && *str; nfields--) {
1.24 schwarze 193: /* Skip one field, including preceding blanks. */
194: for (field_started = 0; *str != '\0'; str += len) {
195: if ((len = mbtowc(&wc, str, MB_CUR_MAX)) == -1) {
196: (void)mbtowc(NULL, NULL, MB_CUR_MAX);
197: wc = L'?';
198: len = 1;
199: }
200: if (iswblank(wc)) {
201: if (field_started)
202: break;
203: } else
204: field_started = 1;
205: }
1.16 kili 206: }
1.24 schwarze 207:
208: /* Skip some additional characters. */
209: for (nchars = numchars; nchars-- && *str != '\0'; str += len)
210: if ((len = mblen(str, MB_CUR_MAX)) == -1)
211: len = 1;
212:
1.15 ray 213: return (str);
1.1 deraadt 214: }
215:
216: FILE *
1.10 deraadt 217: file(char *name, char *mode)
1.1 deraadt 218: {
219: FILE *fp;
220:
1.12 millert 221: if (strcmp(name, "-") == 0)
222: return(*mode == 'r' ? stdin : stdout);
1.1 deraadt 223: if ((fp = fopen(name, mode)) == NULL)
1.6 millert 224: err(1, "%s", name);
1.15 ray 225: return (fp);
1.1 deraadt 226: }
227:
228: void
1.10 deraadt 229: obsolete(char *argv[])
1.1 deraadt 230: {
1.15 ray 231: size_t len;
1.1 deraadt 232: char *ap, *p, *start;
233:
1.7 deraadt 234: while ((ap = *++argv)) {
1.1 deraadt 235: /* Return if "--" or not an option of any form. */
236: if (ap[0] != '-') {
237: if (ap[0] != '+')
238: return;
239: } else if (ap[1] == '-')
240: return;
1.23 mmcc 241: if (!isdigit((unsigned char)ap[1]))
1.1 deraadt 242: continue;
243: /*
244: * Digit signifies an old-style option. Malloc space for dash,
245: * new option and argument.
246: */
1.13 deraadt 247: len = strlen(ap) + 3;
248: if ((start = p = malloc(len)) == NULL)
1.5 mickey 249: err(1, "malloc");
1.1 deraadt 250: *p++ = '-';
251: *p++ = ap[0] == '+' ? 's' : 'f';
1.13 deraadt 252: (void)strlcpy(p, ap + 1, len - 2);
1.1 deraadt 253: *argv = start;
254: }
255: }
256:
1.15 ray 257: __dead void
1.10 deraadt 258: usage(void)
1.1 deraadt 259: {
1.15 ray 260: extern char *__progname;
1.16 kili 261:
1.1 deraadt 262: (void)fprintf(stderr,
1.25 ! tb 263: "usage: %s [-ci] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
1.15 ray 264: __progname);
1.1 deraadt 265: exit(1);
266: }
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