Commit | Line | Data |
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252b5132 | 1 | /* strings -- print the strings of printable characters in files |
8c2bc687 | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
37cc8ec1 | 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 | ||
5af11cab AM |
62 | /* Some platforms need to put stdin into binary mode, to read |
63 | binary files. */ | |
64 | #ifdef HAVE_SETMODE | |
65 | #ifndef O_BINARY | |
66 | #ifdef _O_BINARY | |
67 | #define O_BINARY _O_BINARY | |
68 | #define setmode _setmode | |
69 | #else | |
70 | #define O_BINARY 0 | |
71 | #endif | |
72 | #endif | |
73 | #if O_BINARY | |
74 | #include <io.h> | |
75 | #define SET_BINARY(f) do { if (!isatty(f)) setmode(f,O_BINARY); } while (0) | |
76 | #endif | |
77 | #endif | |
78 | ||
1c529ca6 NC |
79 | /* Not all printable characters have ASCII codes (depending upon the |
80 | LOCALE set) but on some older systems it is not safe to test isprint | |
81 | without first testing isascii... */ | |
82 | #if defined isascii && !defined HAVE_LOCALE_H | |
6b3bf560 | 83 | #define isgraphic(c) (isascii (c) && (isprint (c) || (c) == '\t')) |
252b5132 | 84 | #else |
6b3bf560 | 85 | #define isgraphic(c) (isprint (c) || (c) == '\t') |
252b5132 RH |
86 | #endif |
87 | ||
88 | #ifndef errno | |
89 | extern int errno; | |
90 | #endif | |
91 | ||
92 | /* The BFD section flags that identify an initialized data section. */ | |
93 | #define DATA_FLAGS (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS) | |
94 | ||
95 | /* Radix for printing addresses (must be 8, 10 or 16). */ | |
96 | static int address_radix; | |
97 | ||
98 | /* Minimum length of sequence of graphic chars to trigger output. */ | |
99 | static int string_min; | |
100 | ||
101 | /* true means print address within file for each string. */ | |
102 | static boolean print_addresses; | |
103 | ||
104 | /* true means print filename for each string. */ | |
105 | static boolean print_filenames; | |
106 | ||
107 | /* true means for object files scan only the data section. */ | |
108 | static boolean datasection_only; | |
109 | ||
110 | /* true if we found an initialized data section in the current file. */ | |
111 | static boolean got_a_section; | |
112 | ||
113 | /* The BFD object file format. */ | |
114 | static char *target; | |
115 | ||
116 | static struct option long_options[] = | |
117 | { | |
118 | {"all", no_argument, NULL, 'a'}, | |
119 | {"print-file-name", no_argument, NULL, 'f'}, | |
120 | {"bytes", required_argument, NULL, 'n'}, | |
121 | {"radix", required_argument, NULL, 't'}, | |
122 | {"target", required_argument, NULL, 'T'}, | |
123 | {"help", no_argument, NULL, 'h'}, | |
124 | {"version", no_argument, NULL, 'v'}, | |
125 | {NULL, 0, NULL, 0} | |
126 | }; | |
127 | ||
128 | static void strings_a_section PARAMS ((bfd *, asection *, PTR)); | |
129 | static boolean strings_object_file PARAMS ((const char *)); | |
130 | static boolean strings_file PARAMS ((char *file)); | |
131 | static int integer_arg PARAMS ((char *s)); | |
132 | static void print_strings PARAMS ((const char *filename, FILE *stream, | |
133 | file_ptr address, int stop_point, | |
134 | int magiccount, char *magic)); | |
135 | static void usage PARAMS ((FILE *stream, int status)); | |
136 | \f | |
137 | int | |
138 | main (argc, argv) | |
139 | int argc; | |
140 | char **argv; | |
141 | { | |
142 | int optc; | |
143 | int exit_status = 0; | |
144 | boolean files_given = false; | |
145 | ||
146 | #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) | |
1c529ca6 | 147 | setlocale (LC_ALL, ""); |
252b5132 RH |
148 | #endif |
149 | bindtextdomain (PACKAGE, LOCALEDIR); | |
150 | textdomain (PACKAGE); | |
151 | ||
152 | program_name = argv[0]; | |
153 | xmalloc_set_program_name (program_name); | |
154 | string_min = -1; | |
155 | print_addresses = false; | |
156 | print_filenames = false; | |
157 | datasection_only = true; | |
158 | target = NULL; | |
159 | ||
160 | while ((optc = getopt_long (argc, argv, "afn:ot:v0123456789", | |
161 | long_options, (int *) 0)) != EOF) | |
162 | { | |
163 | switch (optc) | |
164 | { | |
165 | case 'a': | |
166 | datasection_only = false; | |
167 | break; | |
168 | ||
169 | case 'f': | |
170 | print_filenames = true; | |
171 | break; | |
172 | ||
173 | case 'h': | |
174 | usage (stdout, 0); | |
175 | ||
176 | case 'n': | |
177 | string_min = integer_arg (optarg); | |
178 | if (string_min < 1) | |
179 | { | |
37cc8ec1 | 180 | fatal (_("invalid number %s"), optarg); |
252b5132 RH |
181 | } |
182 | break; | |
183 | ||
184 | case 'o': | |
185 | print_addresses = true; | |
186 | address_radix = 8; | |
187 | break; | |
188 | ||
189 | case 't': | |
190 | print_addresses = true; | |
191 | if (optarg[1] != '\0') | |
192 | usage (stderr, 1); | |
193 | switch (optarg[0]) | |
194 | { | |
195 | case 'o': | |
196 | address_radix = 8; | |
197 | break; | |
198 | ||
199 | case 'd': | |
200 | address_radix = 10; | |
201 | break; | |
202 | ||
203 | case 'x': | |
204 | address_radix = 16; | |
205 | break; | |
206 | ||
207 | default: | |
208 | usage (stderr, 1); | |
209 | } | |
210 | break; | |
211 | ||
212 | case 'T': | |
213 | target = optarg; | |
214 | break; | |
215 | ||
216 | case 'v': | |
217 | print_version ("strings"); | |
218 | break; | |
219 | ||
220 | case '?': | |
221 | usage (stderr, 1); | |
222 | ||
223 | default: | |
224 | if (string_min < 0) | |
221f77a9 | 225 | string_min = optc - '0'; |
252b5132 RH |
226 | else |
227 | string_min = string_min * 10 + optc - '0'; | |
228 | break; | |
229 | } | |
230 | } | |
231 | ||
232 | if (string_min < 0) | |
233 | string_min = 4; | |
234 | ||
235 | bfd_init (); | |
236 | set_default_bfd_target (); | |
237 | ||
238 | if (optind >= argc) | |
239 | { | |
240 | datasection_only = false; | |
5af11cab AM |
241 | #ifdef SET_BINARY |
242 | SET_BINARY (fileno (stdin)); | |
243 | #endif | |
252b5132 RH |
244 | print_strings ("{standard input}", stdin, 0, 0, 0, (char *) NULL); |
245 | files_given = true; | |
246 | } | |
247 | else | |
248 | { | |
249 | for (; optind < argc; ++optind) | |
250 | { | |
251 | if (strcmp (argv[optind], "-") == 0) | |
252 | datasection_only = false; | |
253 | else | |
254 | { | |
255 | files_given = true; | |
256 | exit_status |= (strings_file (argv[optind]) == false); | |
257 | } | |
258 | } | |
259 | } | |
260 | ||
261 | if (files_given == false) | |
262 | usage (stderr, 1); | |
263 | ||
264 | return (exit_status); | |
265 | } | |
266 | \f | |
267 | /* Scan section SECT of the file ABFD, whose printable name is FILE. | |
268 | If it contains initialized data, | |
269 | set `got_a_section' and print the strings in it. */ | |
270 | ||
271 | static void | |
272 | strings_a_section (abfd, sect, filearg) | |
273 | bfd *abfd; | |
274 | asection *sect; | |
275 | PTR filearg; | |
276 | { | |
277 | const char *file = (const char *) filearg; | |
278 | ||
279 | if ((sect->flags & DATA_FLAGS) == DATA_FLAGS) | |
280 | { | |
281 | bfd_size_type sz = bfd_get_section_size_before_reloc (sect); | |
282 | PTR mem = xmalloc (sz); | |
283 | if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sz)) | |
284 | { | |
285 | got_a_section = true; | |
286 | print_strings (file, (FILE *) NULL, sect->filepos, 0, sz, mem); | |
287 | } | |
288 | free (mem); | |
289 | } | |
290 | } | |
291 | ||
292 | /* Scan all of the sections in FILE, and print the strings | |
293 | in the initialized data section(s). | |
294 | ||
295 | Return true if successful, | |
296 | false if not (such as if FILE is not an object file). */ | |
297 | ||
298 | static boolean | |
299 | strings_object_file (file) | |
300 | const char *file; | |
301 | { | |
302 | bfd *abfd = bfd_openr (file, target); | |
303 | ||
304 | if (abfd == NULL) | |
305 | { | |
306 | /* Treat the file as a non-object file. */ | |
307 | return false; | |
308 | } | |
309 | ||
310 | /* This call is mainly for its side effect of reading in the sections. | |
311 | We follow the traditional behavior of `strings' in that we don't | |
312 | complain if we don't recognize a file to be an object file. */ | |
313 | if (bfd_check_format (abfd, bfd_object) == false) | |
314 | { | |
315 | bfd_close (abfd); | |
316 | return false; | |
317 | } | |
318 | ||
319 | got_a_section = false; | |
320 | bfd_map_over_sections (abfd, strings_a_section, (PTR) file); | |
321 | ||
322 | if (!bfd_close (abfd)) | |
323 | { | |
324 | bfd_nonfatal (file); | |
325 | return false; | |
326 | } | |
327 | ||
328 | return got_a_section; | |
329 | } | |
330 | ||
331 | /* Print the strings in FILE. Return true if ok, false if an error occurs. */ | |
332 | ||
333 | static boolean | |
334 | strings_file (file) | |
335 | char *file; | |
336 | { | |
337 | /* If we weren't told to scan the whole file, | |
338 | try to open it as an object file and only look at | |
339 | initialized data sections. If that fails, fall back to the | |
340 | whole file. */ | |
341 | if (!datasection_only || !strings_object_file (file)) | |
342 | { | |
343 | FILE *stream; | |
344 | ||
345 | stream = fopen (file, "rb"); | |
346 | /* Not all systems permit "rb", so try "r" if it failed. */ | |
347 | if (stream == NULL) | |
348 | stream = fopen (file, "r"); | |
349 | if (stream == NULL) | |
350 | { | |
351 | fprintf (stderr, "%s: ", program_name); | |
352 | perror (file); | |
353 | return false; | |
354 | } | |
355 | ||
356 | print_strings (file, stream, (file_ptr) 0, 0, 0, (char *) 0); | |
357 | ||
358 | if (fclose (stream) == EOF) | |
359 | { | |
360 | fprintf (stderr, "%s: ", program_name); | |
361 | perror (file); | |
362 | return false; | |
363 | } | |
364 | } | |
365 | ||
366 | return true; | |
367 | } | |
368 | \f | |
369 | /* Find the strings in file FILENAME, read from STREAM. | |
370 | Assume that STREAM is positioned so that the next byte read | |
371 | is at address ADDRESS in the file. | |
372 | Stop reading at address STOP_POINT in the file, if nonzero. | |
373 | ||
374 | If STREAM is NULL, do not read from it. | |
375 | The caller can supply a buffer of characters | |
376 | to be processed before the data in STREAM. | |
377 | MAGIC is the address of the buffer and | |
378 | MAGICCOUNT is how many characters are in it. | |
379 | Those characters come at address ADDRESS and the data in STREAM follow. */ | |
380 | ||
381 | static void | |
382 | print_strings (filename, stream, address, stop_point, magiccount, magic) | |
383 | const char *filename; | |
384 | FILE *stream; | |
385 | file_ptr address; | |
386 | int stop_point; | |
387 | int magiccount; | |
388 | char *magic; | |
389 | { | |
390 | char *buf = (char *) xmalloc (string_min + 1); | |
391 | ||
392 | while (1) | |
393 | { | |
394 | file_ptr start; | |
395 | int i; | |
396 | int c; | |
397 | ||
398 | /* See if the next `string_min' chars are all graphic chars. */ | |
399 | tryline: | |
400 | if (stop_point && address >= stop_point) | |
401 | break; | |
402 | start = address; | |
403 | for (i = 0; i < string_min; i++) | |
404 | { | |
405 | if (magiccount) | |
406 | { | |
407 | magiccount--; | |
408 | c = *magic++; | |
409 | } | |
410 | else | |
411 | { | |
412 | if (stream == NULL) | |
413 | return; | |
414 | c = getc (stream); | |
415 | if (c == EOF) | |
416 | return; | |
417 | } | |
418 | address++; | |
419 | if (!isgraphic (c)) | |
420 | /* Found a non-graphic. Try again starting with next char. */ | |
421 | goto tryline; | |
422 | buf[i] = c; | |
423 | } | |
424 | ||
425 | /* We found a run of `string_min' graphic characters. Print up | |
426 | to the next non-graphic character. */ | |
427 | ||
428 | if (print_filenames) | |
429 | printf ("%s: ", filename); | |
430 | if (print_addresses) | |
431 | switch (address_radix) | |
432 | { | |
433 | case 8: | |
434 | printf ("%7lo ", (unsigned long) start); | |
435 | break; | |
436 | ||
437 | case 10: | |
438 | printf ("%7ld ", (long) start); | |
439 | break; | |
440 | ||
441 | case 16: | |
442 | printf ("%7lx ", (unsigned long) start); | |
443 | break; | |
444 | } | |
445 | ||
446 | buf[i] = '\0'; | |
447 | fputs (buf, stdout); | |
448 | ||
449 | while (1) | |
450 | { | |
451 | if (magiccount) | |
452 | { | |
453 | magiccount--; | |
454 | c = *magic++; | |
455 | } | |
456 | else | |
457 | { | |
458 | if (stream == NULL) | |
459 | break; | |
460 | c = getc (stream); | |
461 | if (c == EOF) | |
462 | break; | |
463 | } | |
464 | address++; | |
465 | if (! isgraphic (c)) | |
466 | break; | |
467 | putchar (c); | |
468 | } | |
469 | ||
470 | putchar ('\n'); | |
471 | } | |
472 | } | |
473 | \f | |
474 | /* Parse string S as an integer, using decimal radix by default, | |
475 | but allowing octal and hex numbers as in C. */ | |
476 | ||
477 | static int | |
478 | integer_arg (s) | |
479 | char *s; | |
480 | { | |
481 | int value; | |
482 | int radix = 10; | |
483 | char *p = s; | |
484 | int c; | |
485 | ||
486 | if (*p != '0') | |
487 | radix = 10; | |
488 | else if (*++p == 'x') | |
489 | { | |
490 | radix = 16; | |
491 | p++; | |
492 | } | |
493 | else | |
494 | radix = 8; | |
495 | ||
496 | value = 0; | |
497 | while (((c = *p++) >= '0' && c <= '9') | |
498 | || (radix == 16 && (c & ~40) >= 'A' && (c & ~40) <= 'Z')) | |
499 | { | |
500 | value *= radix; | |
501 | if (c >= '0' && c <= '9') | |
502 | value += c - '0'; | |
503 | else | |
504 | value += (c & ~40) - 'A'; | |
505 | } | |
506 | ||
507 | if (c == 'b') | |
508 | value *= 512; | |
509 | else if (c == 'B') | |
510 | value *= 1024; | |
511 | else | |
512 | p--; | |
513 | ||
514 | if (*p) | |
515 | { | |
37cc8ec1 | 516 | fatal (_("invalid integer argument %s"), s); |
252b5132 RH |
517 | } |
518 | return value; | |
519 | } | |
520 | ||
521 | static void | |
522 | usage (stream, status) | |
523 | FILE *stream; | |
524 | int status; | |
525 | { | |
526 | fprintf (stream, _("\ | |
527 | Usage: %s [-afov] [-n min-len] [-min-len] [-t {o,x,d}] [-]\n\ | |
528 | [--all] [--print-file-name] [--bytes=min-len] [--radix={o,x,d}]\n\ | |
529 | [--target=bfdname] [--help] [--version] file...\n"), | |
530 | program_name); | |
531 | list_supported_targets (program_name, stream); | |
532 | if (status == 0) | |
8ad3436c | 533 | fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO); |
252b5132 RH |
534 | exit (status); |
535 | } |