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1.2 ! deraadt 1: /* $OpenBSD: strings.c,v 1.7 1995/02/15 15:49:19 jtc Exp $ */
1.1 deraadt 2: /* $NetBSD: strings.c,v 1.7 1995/02/15 15:49:19 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1980, 1987, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1980, 1987, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)strings.c 8.2 (Berkeley) 1/28/94";
46: #endif
1.2 ! deraadt 47: static char rcsid[] = "$OpenBSD: strings.c,v 1.7 1995/02/15 15:49:19 jtc Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: #include <sys/types.h>
51:
52: #include <a.out.h>
53: #include <ctype.h>
54: #include <errno.h>
55: #include <fcntl.h>
56: #include <stdio.h>
57: #include <stdlib.h>
58: #include <string.h>
59: #include <locale.h>
60: #include <unistd.h>
61:
62: #define FORMAT_DEC "%07ld "
63: #define FORMAT_OCT "%07lo "
64: #define FORMAT_HEX "%07lx "
65:
66: #define DEF_LEN 4 /* default minimum string length */
67: #define ISSTR(ch) (isascii(ch) && (isprint(ch) || ch == '\t'))
68:
69: typedef struct exec EXEC; /* struct exec cast */
70:
71: static long foff; /* offset in the file */
72: static int hcnt, /* head count */
73: head_len, /* length of header */
74: read_len; /* length to read */
75: static u_char hbfr[sizeof(EXEC)]; /* buffer for struct exec */
76:
77: static void usage();
78:
79: main(argc, argv)
80: int argc;
81: char **argv;
82: {
83: extern char *optarg;
84: extern int optind;
85: register int ch, cnt;
86: register u_char *C;
87: EXEC *head;
88: int exitcode, minlen;
89: short asdata, fflg;
90: u_char *bfr;
91: char *file, *p;
92: char *offset_format;
93:
94: setlocale(LC_ALL, "");
95:
96: /*
97: * for backward compatibility, allow '-' to specify 'a' flag; no
98: * longer documented in the man page or usage string.
99: */
100: asdata = exitcode = fflg = 0;
101: offset_format = NULL;
102: minlen = -1;
103: while ((ch = getopt(argc, argv, "-0123456789an:oft:")) != -1)
104: switch((char)ch) {
105: case '0': case '1': case '2': case '3': case '4':
106: case '5': case '6': case '7': case '8': case '9':
107: /*
108: * kludge: strings was originally designed to take
109: * a number after a dash.
110: */
111: if (minlen == -1) {
112: p = argv[optind - 1];
113: if (p[0] == '-' && p[1] == ch && !p[2])
114: minlen = atoi(++p);
115: else
116: minlen = atoi(argv[optind] + 1);
117: }
118: break;
119: case '-':
120: case 'a':
121: asdata = 1;
122: break;
123: case 'f':
124: fflg = 1;
125: break;
126: case 'n':
127: minlen = atoi(optarg);
128: break;
129: case 'o':
130: offset_format = FORMAT_OCT;
131: break;
132: case 't':
133: switch (*optarg) {
134: case 'o':
135: offset_format = FORMAT_OCT;
136: break;
137: case 'd':
138: offset_format = FORMAT_DEC;
139: break;
140: case 'x':
141: offset_format = FORMAT_HEX;
142: break;
143: default:
144: usage();
145: /* NOTREACHED */
146: }
147: break;
148: case '?':
149: default:
150: usage();
151: }
152: argc -= optind;
153: argv += optind;
154:
155: if (minlen == -1)
156: minlen = DEF_LEN;
157: else if (minlen < 1) {
158: (void)fprintf(stderr, "strings: length less than 1\n");
159: exit (1);
160: }
161:
162: if (!(bfr = malloc(minlen))) {
163: (void)fprintf(stderr, "strings: %s\n", strerror(errno));
164: exit(1);
165: }
166: bfr[minlen] = '\0';
167: file = "stdin";
168: do {
169: if (*argv) {
170: file = *argv++;
171: if (!freopen(file, "r", stdin)) {
172: (void)fprintf(stderr,
173: "strings: %s: %s\n", file, strerror(errno));
174: exitcode = 1;
175: goto nextfile;
176: }
177: }
178: foff = 0;
179: #define DO_EVERYTHING() {read_len = -1; head_len = 0; goto start;}
180: read_len = -1;
181: if (asdata)
182: DO_EVERYTHING()
183: else {
184: head = (EXEC *)hbfr;
185: if ((head_len =
186: read(fileno(stdin), head, sizeof(EXEC))) == -1)
187: DO_EVERYTHING()
188: if (head_len == sizeof(EXEC) && !N_BADMAG(*head)) {
189: foff = N_TXTOFF(*head);
190: if (fseek(stdin, foff, SEEK_SET) == -1)
191: DO_EVERYTHING()
192: read_len = head->a_text + head->a_data;
193: head_len = 0;
194: }
195: else
196: hcnt = 0;
197: }
198: start:
199: for (cnt = 0; (ch = getch()) != EOF;) {
200: if (ISSTR(ch)) {
201: if (!cnt)
202: C = bfr;
203: *C++ = ch;
204: if (++cnt < minlen)
205: continue;
206:
207: if (fflg)
208: printf("%s:", file);
209:
210: if (offset_format)
211: printf(offset_format, foff - minlen);
212:
213: printf("%s", bfr);
214:
215: while ((ch = getch()) != EOF && ISSTR(ch))
216: putchar((char)ch);
217: putchar('\n');
218: }
219: cnt = 0;
220: }
221: nextfile: ;
222: } while (*argv);
223: exit(exitcode);
224: }
225:
226: /*
227: * getch --
228: * get next character from wherever
229: */
230: getch()
231: {
232: ++foff;
233: if (head_len) {
234: if (hcnt < head_len)
235: return((int)hbfr[hcnt++]);
236: head_len = 0;
237: }
238: if (read_len == -1 || read_len-- > 0)
239: return(getchar());
240: return(EOF);
241: }
242:
243: static void
244: usage()
245: {
246: (void)fprintf(stderr,
247: "usage: strings [-afo] [-n length] [-t {o,d,x}] [file ... ]\n");
248: exit(1);
249: }