2 * Copyright (c) 1980, 1987, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static char copyright[] =
36 "@(#) Copyright (c) 1980, 1987, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
41 static char sccsid[] = "@(#)strings.c 8.2 (Berkeley) 1/28/94";
44 #include <sys/types.h>
55 #define DEF_LEN 4 /* default minimum string length */
56 #define ISSTR(ch) (isascii(ch) && (isprint(ch) || ch == '\t'))
58 typedef struct exec EXEC; /* struct exec cast */
60 static long foff; /* offset in the file */
61 static int hcnt, /* head count */
62 head_len, /* length of header */
63 read_len; /* length to read */
64 static u_char hbfr[sizeof(EXEC)]; /* buffer for struct exec */
78 short asdata, oflg, fflg;
83 * for backward compatibility, allow '-' to specify 'a' flag; no
84 * longer documented in the man page or usage string.
86 asdata = exitcode = fflg = oflg = 0;
88 while ((ch = getopt(argc, argv, "-0123456789an:of")) != EOF)
90 case '0': case '1': case '2': case '3': case '4':
91 case '5': case '6': case '7': case '8': case '9':
93 * kludge: strings was originally designed to take
94 * a number after a dash.
98 if (p[0] == '-' && p[1] == ch && !p[2])
101 minlen = atoi(argv[optind] + 1);
112 minlen = atoi(optarg);
127 (void)fprintf(stderr, "strings: length less than 1\n");
131 if (!(bfr = malloc((u_int)minlen))) {
132 (void)fprintf(stderr, "strings: %s\n", strerror(errno));
140 if (!freopen(file, "r", stdin)) {
141 (void)fprintf(stderr,
142 "strings: %s: %s\n", file, strerror(errno));
148 #define DO_EVERYTHING() {read_len = -1; head_len = 0; goto start;}
155 read(fileno(stdin), head, sizeof(EXEC))) == -1)
157 if (head_len == sizeof(EXEC) && !N_BADMAG(*head)) {
158 foff = N_TXTOFF(*head);
159 if (fseek(stdin, foff, SEEK_SET) == -1)
161 read_len = head->a_text + head->a_data;
168 for (cnt = 0; (ch = getch()) != EOF;) {
179 foff - minlen, (char *)bfr);
182 while ((ch = getch()) != EOF && ISSTR(ch))
195 * get next character from wherever
202 return((int)hbfr[hcnt++]);
205 if (read_len == -1 || read_len-- > 0)
213 (void)fprintf(stderr,
214 "usage: strings [-afo] [-n length] [file ... ]\n");