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1.15 ! deraadt 1: /* $OpenBSD: strings.c,v 1.14 2008/06/01 21:42:30 sobrado 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.
1.10 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/types.h>
34:
35: #include <a.out.h>
36: #include <ctype.h>
37: #include <errno.h>
38: #include <fcntl.h>
39: #include <stdio.h>
40: #include <stdlib.h>
41: #include <string.h>
42: #include <locale.h>
43: #include <unistd.h>
1.12 mickey 44: #include <err.h>
1.1 deraadt 45:
46: #define FORMAT_DEC "%07ld "
47: #define FORMAT_OCT "%07lo "
48: #define FORMAT_HEX "%07lx "
49:
50: #define DEF_LEN 4 /* default minimum string length */
51: #define ISSTR(ch) (isascii(ch) && (isprint(ch) || ch == '\t'))
52:
53: typedef struct exec EXEC; /* struct exec cast */
54:
55: static long foff; /* offset in the file */
56: static int hcnt, /* head count */
57: head_len, /* length of header */
58: read_len; /* length to read */
59: static u_char hbfr[sizeof(EXEC)]; /* buffer for struct exec */
60:
1.7 millert 61: static void usage(void);
62: int getch(void);
1.1 deraadt 63:
1.4 deraadt 64: int
1.11 deraadt 65: main(int argc, char *argv[])
1.1 deraadt 66: {
67: extern char *optarg;
68: extern int optind;
1.6 mpech 69: int ch, cnt;
70: u_char *C;
1.1 deraadt 71: EXEC *head;
1.5 provos 72: int exitcode, minlen, maxlen, bfrlen;
1.1 deraadt 73: short asdata, fflg;
74: u_char *bfr;
75: char *file, *p;
76: char *offset_format;
77:
78: setlocale(LC_ALL, "");
79:
80: /*
81: * for backward compatibility, allow '-' to specify 'a' flag; no
82: * longer documented in the man page or usage string.
83: */
84: asdata = exitcode = fflg = 0;
85: offset_format = NULL;
86: minlen = -1;
1.5 provos 87: maxlen = -1;
1.9 millert 88: while ((ch = getopt(argc, argv, "0123456789an:m:oft:-")) != -1)
1.1 deraadt 89: switch((char)ch) {
90: case '0': case '1': case '2': case '3': case '4':
91: case '5': case '6': case '7': case '8': case '9':
92: /*
93: * kludge: strings was originally designed to take
94: * a number after a dash.
95: */
96: if (minlen == -1) {
97: p = argv[optind - 1];
98: if (p[0] == '-' && p[1] == ch && !p[2])
99: minlen = atoi(++p);
100: else
101: minlen = atoi(argv[optind] + 1);
102: }
103: break;
104: case '-':
105: case 'a':
106: asdata = 1;
107: break;
108: case 'f':
109: fflg = 1;
110: break;
111: case 'n':
112: minlen = atoi(optarg);
113: break;
1.5 provos 114: case 'm':
115: maxlen = atoi(optarg);
116: break;
1.1 deraadt 117: case 'o':
118: offset_format = FORMAT_OCT;
119: break;
120: case 't':
121: switch (*optarg) {
122: case 'o':
123: offset_format = FORMAT_OCT;
124: break;
125: case 'd':
126: offset_format = FORMAT_DEC;
127: break;
128: case 'x':
129: offset_format = FORMAT_HEX;
130: break;
131: default:
132: usage();
133: /* NOTREACHED */
134: }
135: break;
136: case '?':
137: default:
138: usage();
139: }
140: argc -= optind;
141: argv += optind;
142:
143: if (minlen == -1)
144: minlen = DEF_LEN;
1.12 mickey 145: else if (minlen < 1)
146: errx(1, "length less than 1");
147: if (maxlen != -1 && maxlen < minlen)
148: errx(1, "max length less than min");
1.5 provos 149: bfrlen = maxlen == -1 ? minlen : maxlen;
150: bfr = malloc(bfrlen + 1);
1.12 mickey 151: if (!bfr)
152: err(1, "malloc");
1.5 provos 153: bfr[bfrlen] = '\0';
1.1 deraadt 154: file = "stdin";
155: do {
156: if (*argv) {
157: file = *argv++;
158: if (!freopen(file, "r", stdin)) {
1.12 mickey 159: warn("%s", file);
1.1 deraadt 160: exitcode = 1;
161: goto nextfile;
162: }
163: }
164: foff = 0;
165: #define DO_EVERYTHING() {read_len = -1; head_len = 0; goto start;}
166: read_len = -1;
167: if (asdata)
168: DO_EVERYTHING()
169: else {
170: head = (EXEC *)hbfr;
171: if ((head_len =
172: read(fileno(stdin), head, sizeof(EXEC))) == -1)
173: DO_EVERYTHING()
174: if (head_len == sizeof(EXEC) && !N_BADMAG(*head)) {
175: foff = N_TXTOFF(*head);
176: if (fseek(stdin, foff, SEEK_SET) == -1)
177: DO_EVERYTHING()
178: read_len = head->a_text + head->a_data;
179: head_len = 0;
180: }
181: else
182: hcnt = 0;
183: }
184: start:
1.13 ray 185: for (cnt = 0, C = bfr; (ch = getch()) != EOF;) {
1.1 deraadt 186: if (ISSTR(ch)) {
187: *C++ = ch;
188: if (++cnt < minlen)
189: continue;
1.5 provos 190: if (maxlen != -1) {
191: while ((ch = getch()) != EOF &&
192: ISSTR(ch) && cnt++ < maxlen)
193: *C++ = ch;
194: if (ch == EOF ||
195: (ch != 0 && ch != '\n')) {
196: /* get all of too big string */
197: while ((ch = getch()) != EOF &&
198: ISSTR(ch))
199: ;
200: ungetc(ch, stdin);
201: goto out;
202: }
203: *C = 0;
204: }
1.1 deraadt 205:
206: if (fflg)
207: printf("%s:", file);
208:
209: if (offset_format)
210: printf(offset_format, foff - minlen);
211:
212: printf("%s", bfr);
1.5 provos 213:
214: if (maxlen == -1)
215: while ((ch = getch()) != EOF &&
216: ISSTR(ch))
217: putchar((char)ch);
1.1 deraadt 218: putchar('\n');
1.5 provos 219: out:
1.8 millert 220: ;
1.1 deraadt 221: }
222: cnt = 0;
1.13 ray 223: C = bfr;
1.1 deraadt 224: }
225: nextfile: ;
226: } while (*argv);
227: exit(exitcode);
228: }
229:
230: /*
231: * getch --
232: * get next character from wherever
233: */
1.4 deraadt 234: int
1.11 deraadt 235: getch(void)
1.1 deraadt 236: {
237: ++foff;
238: if (head_len) {
239: if (hcnt < head_len)
240: return((int)hbfr[hcnt++]);
241: head_len = 0;
242: }
243: if (read_len == -1 || read_len-- > 0)
244: return(getchar());
245: return(EOF);
246: }
247:
248: static void
1.11 deraadt 249: usage(void)
1.1 deraadt 250: {
251: (void)fprintf(stderr,
1.14 sobrado 252: "usage: strings [-afo] [-m number] [-n number] [-t radix] [file ...]\n");
1.1 deraadt 253: exit(1);
254: }