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252b5132 | 1 | /* strings -- print the strings of printable characters in files |
37cc8ec1 AM |
2 | Copyright (C) 1993, 94, 95, 96, 97, 98, 99, 2000 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
18 | 02111-1307, USA. */ | |
19 | \f | |
20 | /* Usage: strings [options] file... | |
21 | ||
22 | Options: | |
23 | --all | |
24 | -a | |
25 | - Do not scan only the initialized data section of object files. | |
26 | ||
27 | --print-file-name | |
28 | -f Print the name of the file before each string. | |
29 | ||
30 | --bytes=min-len | |
31 | -n min-len | |
32 | -min-len Print graphic char sequences, MIN-LEN or more bytes long, | |
33 | that are followed by a NUL or a newline. Default is 4. | |
34 | ||
35 | --radix={o,x,d} | |
36 | -t {o,x,d} Print the offset within the file before each string, | |
37 | in octal/hex/decimal. | |
38 | ||
39 | -o Like -to. (Some other implementations have -o like -to, | |
40 | others like -td. We chose one arbitrarily.) | |
41 | ||
42 | --target=BFDNAME | |
43 | Specify a non-default object file format. | |
44 | ||
45 | --help | |
46 | -h Print the usage message on the standard output. | |
47 | ||
48 | --version | |
49 | -v Print the program version number. | |
50 | ||
51 | Written by Richard Stallman <rms@gnu.ai.mit.edu> | |
52 | and David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
53 | ||
54 | #include "bfd.h" | |
55 | #include <stdio.h> | |
56 | #include <getopt.h> | |
57 | #include <ctype.h> | |
58 | #include <errno.h> | |
59 | #include "bucomm.h" | |
60 | #include "libiberty.h" | |
61 | ||
62 | #ifdef isascii | |
63 | #define isgraphic(c) (isascii (c) && isprint (c)) | |
64 | #else | |
65 | #define isgraphic(c) (isprint (c)) | |
66 | #endif | |
67 | ||
68 | #ifndef errno | |
69 | extern int errno; | |
70 | #endif | |
71 | ||
72 | /* The BFD section flags that identify an initialized data section. */ | |
73 | #define DATA_FLAGS (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS) | |
74 | ||
75 | /* Radix for printing addresses (must be 8, 10 or 16). */ | |
76 | static int address_radix; | |
77 | ||
78 | /* Minimum length of sequence of graphic chars to trigger output. */ | |
79 | static int string_min; | |
80 | ||
81 | /* true means print address within file for each string. */ | |
82 | static boolean print_addresses; | |
83 | ||
84 | /* true means print filename for each string. */ | |
85 | static boolean print_filenames; | |
86 | ||
87 | /* true means for object files scan only the data section. */ | |
88 | static boolean datasection_only; | |
89 | ||
90 | /* true if we found an initialized data section in the current file. */ | |
91 | static boolean got_a_section; | |
92 | ||
93 | /* The BFD object file format. */ | |
94 | static char *target; | |
95 | ||
96 | static struct option long_options[] = | |
97 | { | |
98 | {"all", no_argument, NULL, 'a'}, | |
99 | {"print-file-name", no_argument, NULL, 'f'}, | |
100 | {"bytes", required_argument, NULL, 'n'}, | |
101 | {"radix", required_argument, NULL, 't'}, | |
102 | {"target", required_argument, NULL, 'T'}, | |
103 | {"help", no_argument, NULL, 'h'}, | |
104 | {"version", no_argument, NULL, 'v'}, | |
105 | {NULL, 0, NULL, 0} | |
106 | }; | |
107 | ||
108 | static void strings_a_section PARAMS ((bfd *, asection *, PTR)); | |
109 | static boolean strings_object_file PARAMS ((const char *)); | |
110 | static boolean strings_file PARAMS ((char *file)); | |
111 | static int integer_arg PARAMS ((char *s)); | |
112 | static void print_strings PARAMS ((const char *filename, FILE *stream, | |
113 | file_ptr address, int stop_point, | |
114 | int magiccount, char *magic)); | |
115 | static void usage PARAMS ((FILE *stream, int status)); | |
116 | \f | |
117 | int | |
118 | main (argc, argv) | |
119 | int argc; | |
120 | char **argv; | |
121 | { | |
122 | int optc; | |
123 | int exit_status = 0; | |
124 | boolean files_given = false; | |
125 | ||
126 | #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) | |
127 | setlocale (LC_MESSAGES, ""); | |
128 | #endif | |
129 | bindtextdomain (PACKAGE, LOCALEDIR); | |
130 | textdomain (PACKAGE); | |
131 | ||
132 | program_name = argv[0]; | |
133 | xmalloc_set_program_name (program_name); | |
134 | string_min = -1; | |
135 | print_addresses = false; | |
136 | print_filenames = false; | |
137 | datasection_only = true; | |
138 | target = NULL; | |
139 | ||
140 | while ((optc = getopt_long (argc, argv, "afn:ot:v0123456789", | |
141 | long_options, (int *) 0)) != EOF) | |
142 | { | |
143 | switch (optc) | |
144 | { | |
145 | case 'a': | |
146 | datasection_only = false; | |
147 | break; | |
148 | ||
149 | case 'f': | |
150 | print_filenames = true; | |
151 | break; | |
152 | ||
153 | case 'h': | |
154 | usage (stdout, 0); | |
155 | ||
156 | case 'n': | |
157 | string_min = integer_arg (optarg); | |
158 | if (string_min < 1) | |
159 | { | |
37cc8ec1 | 160 | fatal (_("invalid number %s"), optarg); |
252b5132 RH |
161 | } |
162 | break; | |
163 | ||
164 | case 'o': | |
165 | print_addresses = true; | |
166 | address_radix = 8; | |
167 | break; | |
168 | ||
169 | case 't': | |
170 | print_addresses = true; | |
171 | if (optarg[1] != '\0') | |
172 | usage (stderr, 1); | |
173 | switch (optarg[0]) | |
174 | { | |
175 | case 'o': | |
176 | address_radix = 8; | |
177 | break; | |
178 | ||
179 | case 'd': | |
180 | address_radix = 10; | |
181 | break; | |
182 | ||
183 | case 'x': | |
184 | address_radix = 16; | |
185 | break; | |
186 | ||
187 | default: | |
188 | usage (stderr, 1); | |
189 | } | |
190 | break; | |
191 | ||
192 | case 'T': | |
193 | target = optarg; | |
194 | break; | |
195 | ||
196 | case 'v': | |
197 | print_version ("strings"); | |
198 | break; | |
199 | ||
200 | case '?': | |
201 | usage (stderr, 1); | |
202 | ||
203 | default: | |
204 | if (string_min < 0) | |
221f77a9 | 205 | string_min = optc - '0'; |
252b5132 RH |
206 | else |
207 | string_min = string_min * 10 + optc - '0'; | |
208 | break; | |
209 | } | |
210 | } | |
211 | ||
212 | if (string_min < 0) | |
213 | string_min = 4; | |
214 | ||
215 | bfd_init (); | |
216 | set_default_bfd_target (); | |
217 | ||
218 | if (optind >= argc) | |
219 | { | |
220 | datasection_only = false; | |
221 | print_strings ("{standard input}", stdin, 0, 0, 0, (char *) NULL); | |
222 | files_given = true; | |
223 | } | |
224 | else | |
225 | { | |
226 | for (; optind < argc; ++optind) | |
227 | { | |
228 | if (strcmp (argv[optind], "-") == 0) | |
229 | datasection_only = false; | |
230 | else | |
231 | { | |
232 | files_given = true; | |
233 | exit_status |= (strings_file (argv[optind]) == false); | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | if (files_given == false) | |
239 | usage (stderr, 1); | |
240 | ||
241 | return (exit_status); | |
242 | } | |
243 | \f | |
244 | /* Scan section SECT of the file ABFD, whose printable name is FILE. | |
245 | If it contains initialized data, | |
246 | set `got_a_section' and print the strings in it. */ | |
247 | ||
248 | static void | |
249 | strings_a_section (abfd, sect, filearg) | |
250 | bfd *abfd; | |
251 | asection *sect; | |
252 | PTR filearg; | |
253 | { | |
254 | const char *file = (const char *) filearg; | |
255 | ||
256 | if ((sect->flags & DATA_FLAGS) == DATA_FLAGS) | |
257 | { | |
258 | bfd_size_type sz = bfd_get_section_size_before_reloc (sect); | |
259 | PTR mem = xmalloc (sz); | |
260 | if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sz)) | |
261 | { | |
262 | got_a_section = true; | |
263 | print_strings (file, (FILE *) NULL, sect->filepos, 0, sz, mem); | |
264 | } | |
265 | free (mem); | |
266 | } | |
267 | } | |
268 | ||
269 | /* Scan all of the sections in FILE, and print the strings | |
270 | in the initialized data section(s). | |
271 | ||
272 | Return true if successful, | |
273 | false if not (such as if FILE is not an object file). */ | |
274 | ||
275 | static boolean | |
276 | strings_object_file (file) | |
277 | const char *file; | |
278 | { | |
279 | bfd *abfd = bfd_openr (file, target); | |
280 | ||
281 | if (abfd == NULL) | |
282 | { | |
283 | /* Treat the file as a non-object file. */ | |
284 | return false; | |
285 | } | |
286 | ||
287 | /* This call is mainly for its side effect of reading in the sections. | |
288 | We follow the traditional behavior of `strings' in that we don't | |
289 | complain if we don't recognize a file to be an object file. */ | |
290 | if (bfd_check_format (abfd, bfd_object) == false) | |
291 | { | |
292 | bfd_close (abfd); | |
293 | return false; | |
294 | } | |
295 | ||
296 | got_a_section = false; | |
297 | bfd_map_over_sections (abfd, strings_a_section, (PTR) file); | |
298 | ||
299 | if (!bfd_close (abfd)) | |
300 | { | |
301 | bfd_nonfatal (file); | |
302 | return false; | |
303 | } | |
304 | ||
305 | return got_a_section; | |
306 | } | |
307 | ||
308 | /* Print the strings in FILE. Return true if ok, false if an error occurs. */ | |
309 | ||
310 | static boolean | |
311 | strings_file (file) | |
312 | char *file; | |
313 | { | |
314 | /* If we weren't told to scan the whole file, | |
315 | try to open it as an object file and only look at | |
316 | initialized data sections. If that fails, fall back to the | |
317 | whole file. */ | |
318 | if (!datasection_only || !strings_object_file (file)) | |
319 | { | |
320 | FILE *stream; | |
321 | ||
322 | stream = fopen (file, "rb"); | |
323 | /* Not all systems permit "rb", so try "r" if it failed. */ | |
324 | if (stream == NULL) | |
325 | stream = fopen (file, "r"); | |
326 | if (stream == NULL) | |
327 | { | |
328 | fprintf (stderr, "%s: ", program_name); | |
329 | perror (file); | |
330 | return false; | |
331 | } | |
332 | ||
333 | print_strings (file, stream, (file_ptr) 0, 0, 0, (char *) 0); | |
334 | ||
335 | if (fclose (stream) == EOF) | |
336 | { | |
337 | fprintf (stderr, "%s: ", program_name); | |
338 | perror (file); | |
339 | return false; | |
340 | } | |
341 | } | |
342 | ||
343 | return true; | |
344 | } | |
345 | \f | |
346 | /* Find the strings in file FILENAME, read from STREAM. | |
347 | Assume that STREAM is positioned so that the next byte read | |
348 | is at address ADDRESS in the file. | |
349 | Stop reading at address STOP_POINT in the file, if nonzero. | |
350 | ||
351 | If STREAM is NULL, do not read from it. | |
352 | The caller can supply a buffer of characters | |
353 | to be processed before the data in STREAM. | |
354 | MAGIC is the address of the buffer and | |
355 | MAGICCOUNT is how many characters are in it. | |
356 | Those characters come at address ADDRESS and the data in STREAM follow. */ | |
357 | ||
358 | static void | |
359 | print_strings (filename, stream, address, stop_point, magiccount, magic) | |
360 | const char *filename; | |
361 | FILE *stream; | |
362 | file_ptr address; | |
363 | int stop_point; | |
364 | int magiccount; | |
365 | char *magic; | |
366 | { | |
367 | char *buf = (char *) xmalloc (string_min + 1); | |
368 | ||
369 | while (1) | |
370 | { | |
371 | file_ptr start; | |
372 | int i; | |
373 | int c; | |
374 | ||
375 | /* See if the next `string_min' chars are all graphic chars. */ | |
376 | tryline: | |
377 | if (stop_point && address >= stop_point) | |
378 | break; | |
379 | start = address; | |
380 | for (i = 0; i < string_min; i++) | |
381 | { | |
382 | if (magiccount) | |
383 | { | |
384 | magiccount--; | |
385 | c = *magic++; | |
386 | } | |
387 | else | |
388 | { | |
389 | if (stream == NULL) | |
390 | return; | |
391 | c = getc (stream); | |
392 | if (c == EOF) | |
393 | return; | |
394 | } | |
395 | address++; | |
396 | if (!isgraphic (c)) | |
397 | /* Found a non-graphic. Try again starting with next char. */ | |
398 | goto tryline; | |
399 | buf[i] = c; | |
400 | } | |
401 | ||
402 | /* We found a run of `string_min' graphic characters. Print up | |
403 | to the next non-graphic character. */ | |
404 | ||
405 | if (print_filenames) | |
406 | printf ("%s: ", filename); | |
407 | if (print_addresses) | |
408 | switch (address_radix) | |
409 | { | |
410 | case 8: | |
411 | printf ("%7lo ", (unsigned long) start); | |
412 | break; | |
413 | ||
414 | case 10: | |
415 | printf ("%7ld ", (long) start); | |
416 | break; | |
417 | ||
418 | case 16: | |
419 | printf ("%7lx ", (unsigned long) start); | |
420 | break; | |
421 | } | |
422 | ||
423 | buf[i] = '\0'; | |
424 | fputs (buf, stdout); | |
425 | ||
426 | while (1) | |
427 | { | |
428 | if (magiccount) | |
429 | { | |
430 | magiccount--; | |
431 | c = *magic++; | |
432 | } | |
433 | else | |
434 | { | |
435 | if (stream == NULL) | |
436 | break; | |
437 | c = getc (stream); | |
438 | if (c == EOF) | |
439 | break; | |
440 | } | |
441 | address++; | |
442 | if (! isgraphic (c)) | |
443 | break; | |
444 | putchar (c); | |
445 | } | |
446 | ||
447 | putchar ('\n'); | |
448 | } | |
449 | } | |
450 | \f | |
451 | /* Parse string S as an integer, using decimal radix by default, | |
452 | but allowing octal and hex numbers as in C. */ | |
453 | ||
454 | static int | |
455 | integer_arg (s) | |
456 | char *s; | |
457 | { | |
458 | int value; | |
459 | int radix = 10; | |
460 | char *p = s; | |
461 | int c; | |
462 | ||
463 | if (*p != '0') | |
464 | radix = 10; | |
465 | else if (*++p == 'x') | |
466 | { | |
467 | radix = 16; | |
468 | p++; | |
469 | } | |
470 | else | |
471 | radix = 8; | |
472 | ||
473 | value = 0; | |
474 | while (((c = *p++) >= '0' && c <= '9') | |
475 | || (radix == 16 && (c & ~40) >= 'A' && (c & ~40) <= 'Z')) | |
476 | { | |
477 | value *= radix; | |
478 | if (c >= '0' && c <= '9') | |
479 | value += c - '0'; | |
480 | else | |
481 | value += (c & ~40) - 'A'; | |
482 | } | |
483 | ||
484 | if (c == 'b') | |
485 | value *= 512; | |
486 | else if (c == 'B') | |
487 | value *= 1024; | |
488 | else | |
489 | p--; | |
490 | ||
491 | if (*p) | |
492 | { | |
37cc8ec1 | 493 | fatal (_("invalid integer argument %s"), s); |
252b5132 RH |
494 | } |
495 | return value; | |
496 | } | |
497 | ||
498 | static void | |
499 | usage (stream, status) | |
500 | FILE *stream; | |
501 | int status; | |
502 | { | |
503 | fprintf (stream, _("\ | |
504 | Usage: %s [-afov] [-n min-len] [-min-len] [-t {o,x,d}] [-]\n\ | |
505 | [--all] [--print-file-name] [--bytes=min-len] [--radix={o,x,d}]\n\ | |
506 | [--target=bfdname] [--help] [--version] file...\n"), | |
507 | program_name); | |
508 | list_supported_targets (program_name, stream); | |
509 | if (status == 0) | |
8ad3436c | 510 | fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO); |
252b5132 RH |
511 | exit (status); |
512 | } |