507 lines
11 KiB
C
507 lines
11 KiB
C
/* strings -- print the strings of printable characters in files
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Copyright (C) 1993 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Usage: strings [options] file...
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Options:
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--all
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-a
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- Do not scan only the initialized data section of object files.
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--print-file-name
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-f Print the name of the file before each string.
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--bytes=min-len
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-n min-len
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-min-len Print graphic char sequences, MIN-LEN or more bytes long,
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that are followed by a NUL or a newline. Default is 4.
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--radix={o,x,d}
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-t {o,x,d} Print the offset within the file before each string,
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in octal/hex/decimal.
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-o Like -to. (Some other implementations have -o like -to,
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others like -td. We chose one arbitrarily.)
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--help
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-h Print the usage message on the standard output.
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--version
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-v Print the program version number.
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Written by Richard Stallman <rms@gnu.ai.mit.edu>
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and David MacKenzie <djm@gnu.ai.mit.edu>. */
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#include <stdio.h>
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#include <getopt.h>
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#include <ctype.h>
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#include <errno.h>
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#include <bfd.h>
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#ifdef isascii
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#define isgraphic(c) (isascii (c) && isprint (c))
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#else
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#define isgraphic(c) (isprint (c))
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#endif
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#ifndef errno
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extern int errno;
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#endif
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/* The BFD section flags that identify an initialized data section. */
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#define DATA_FLAGS (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS)
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/* Radix for printing addresses (must be 8, 10 or 16). */
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static int address_radix;
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/* Minimum length of sequence of graphic chars to trigger output. */
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static int string_min;
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/* true means print address within file for each string. */
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static boolean print_addresses;
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/* true means print filename for each string. */
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static boolean print_filenames;
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/* true means for object files scan only the data section. */
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static boolean datasection_only;
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/* true if we found an initialized data section in the current file. */
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static boolean got_a_section;
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/* Opened to /dev/null for reading from a BFD. */
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static FILE *devnull;
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extern char *program_name;
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extern char *program_version;
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static struct option long_options[] =
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{
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{"all", no_argument, NULL, 'a'},
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{"print-file-name", no_argument, NULL, 'f'},
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{"bytes", required_argument, NULL, 'n'},
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{"radix", required_argument, NULL, 't'},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'v'},
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{NULL, 0, NULL, 0}
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};
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char *xmalloc ();
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char *xrealloc ();
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static boolean strings_file ();
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static int integer_arg ();
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static void dump_strings ();
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static void usage ();
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void
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main (argc, argv)
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int argc;
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char **argv;
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{
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int optc;
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int exit_status = 0;
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boolean files_given = false;
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program_name = argv[0];
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string_min = -1;
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print_addresses = false;
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print_filenames = false;
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datasection_only = true;
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while ((optc = getopt_long (argc, argv, "afhn:ot:v0123456789",
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long_options, (int *) 0)) != EOF)
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{
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switch (optc)
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{
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case 'a':
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datasection_only = false;
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break;
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case 'f':
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print_filenames = true;
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break;
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case 'h':
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usage (stdout);
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exit (0);
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case 'n':
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string_min = integer_arg (optarg);
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if (string_min < 1)
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{
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fprintf (stderr, "%s: invalid number %s\n",
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program_name, optarg);
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exit (1);
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}
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break;
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case 'o':
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print_addresses = true;
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address_radix = 8;
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break;
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case 't':
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print_addresses = true;
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if (optarg[1] != '\0')
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usage ();
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switch (optarg[0])
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{
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case 'o':
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address_radix = 8;
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break;
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case 'd':
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address_radix = 10;
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break;
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case 'x':
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address_radix = 16;
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break;
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default:
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usage ();
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}
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break;
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case 'v':
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printf ("%s version %s\n", program_name, program_version);
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exit (0);
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case '?':
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usage (stderr);
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default:
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if (string_min < 0)
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string_min = optc;
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else
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string_min = string_min * 10 + optc - '0';
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break;
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}
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}
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if (string_min < 0)
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string_min = 4;
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bfd_init ();
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devnull = fopen ("/dev/null", "r");
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if (devnull == NULL)
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{
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fprintf (stderr, "%s: ", program_name);
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perror ("/dev/null");
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exit (1);
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}
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for (; optind < argc; ++optind)
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{
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if (!strcmp (argv[optind], "-"))
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datasection_only = false;
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else
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{
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files_given = true;
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exit_status |= (strings_file (argv[optind]) == false);
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}
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}
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if (files_given == false)
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usage (stderr);
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exit (exit_status);
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}
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/* Scan the sections of the file ABFD, whose printable name is FILE.
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If any of them contain initialized data,
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set `got_a_section' and print the strings in them. */
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static void
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strings_a_section (abfd, sect, file)
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bfd *abfd;
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asection *sect;
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PTR file;
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{
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if ((sect->flags & DATA_FLAGS) == DATA_FLAGS)
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{
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bfd_size_type sz = bfd_get_section_size_before_reloc (sect);
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PTR mem = xmalloc (sz);
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if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sz))
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{
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got_a_section = true;
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dump_strings (file, devnull, sect->filepos, 0, sz, mem);
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}
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free (mem);
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}
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}
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/* Print the strings in the initialized data section of FILE.
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Return true if successful,
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false if not (such as if FILE is not an object file). */
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static boolean
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strings_object_file (file)
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char *file;
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{
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bfd *abfd = bfd_openr (file, NULL);
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if (abfd == NULL)
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{
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if (bfd_error != system_call_error)
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{
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/* Out of memory, or an invalid target is specified by the
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GNUTARGET environment variable. */
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fprintf (stderr, "%s: ", program_name);
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bfd_perror (file);
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}
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return false;
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}
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/* For some reason, without this call, the BFD has no sections.
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This call is only for the side effect of reading in the sections. */
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bfd_check_format (abfd, bfd_object);
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got_a_section = false;
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bfd_map_over_sections (abfd, strings_a_section, file);
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if (!bfd_close (abfd))
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{
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fprintf (stderr, "%s: ", program_name);
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bfd_perror (file);
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return false;
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}
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return got_a_section;
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}
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/* Print the strings in FILE. Return true if ok, false if an error occurs. */
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static boolean
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strings_file (file)
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char *file;
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{
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/* If we weren't told to scan the whole file,
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try to open it as an object file and only look at
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initialized data sections. If that fails, fall back to the
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whole file. */
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if (!datasection_only || !strings_object_file (file))
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{
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FILE *stream;
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stream = fopen (file, "r");
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if (stream == NULL)
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{
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fprintf (stderr, "%s: ", program_name);
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perror (file);
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return false;
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}
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dump_strings (file, stream, (file_ptr) 0, 0, 0, (char *) 0);
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if (fclose (stream) == EOF)
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{
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fprintf (stderr, "%s: ", program_name);
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perror (file);
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return false;
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}
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}
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return true;
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}
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/* Find the strings in file FILENAME, read from STREAM.
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Assume that STREAM is positioned so that the next byte read
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is at address ADDRESS in the file.
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Stop reading at address STOP_POINT in the file, if nonzero.
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Optionally the caller can supply a buffer of characters
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to be processed before the data in STREAM.
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MAGIC is the address of the buffer and
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MAGICCOUNT is how many characters are in it.
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Those characters come at address ADDRESS and the data in STREAM follow. */
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static void
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dump_strings (filename, stream, address, stop_point, magiccount, magic)
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char *filename;
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FILE *stream;
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file_ptr address;
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int stop_point;
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int magiccount;
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char *magic;
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{
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int bufsize = 100;
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char *buf = (char *) xmalloc (bufsize);
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while (1)
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{
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int i;
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int c;
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/* See if the next `string_min' chars are all graphic chars. */
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tryline:
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if (stop_point && address >= stop_point)
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break;
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for (i = 0; i < string_min; i++)
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{
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if (magiccount)
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{
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magiccount--;
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c = *magic++;
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}
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else
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{
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c = getc (stream);
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if (c < 0)
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return;
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}
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address++;
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if (!isgraphic (c))
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/* Found a non-graphic. Try again starting with next char. */
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goto tryline;
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buf[i] = c;
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}
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/* We found a run of `string_min' graphic characters.
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Now see if it is terminated with a NUL byte or a newline. */
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while (1)
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{
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if (i == bufsize)
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{
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bufsize *= 2;
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buf = (char *) xrealloc (buf, bufsize);
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}
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if (magiccount)
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{
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magiccount--;
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c = *magic++;
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}
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else
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{
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c = getc (stream);
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if (c < 0)
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return;
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}
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address++;
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if (c == '\0' || c == '\n')
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break; /* It is; print this string. */
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if (!isgraphic (c))
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goto tryline; /* It isn't; give up on this string. */
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buf[i++] = c; /* The string continues; store it all. */
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}
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/* If we get here, the string is all graphics and properly terminated,
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so print it. It is all in `buf' and `i' is its length. */
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buf[i] = '\0';
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if (print_filenames)
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printf ("%s: ", filename);
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if (print_addresses)
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switch (address_radix)
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{
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case 8:
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printf ("%7lo ", address - i - 1);
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break;
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case 10:
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printf ("%7ld ", address - i - 1);
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break;
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case 16:
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printf ("%7lx ", address - i - 1);
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break;
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}
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for (i = 0; (c = buf[i]) != '\0'; i++)
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switch (c)
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{
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case '\n':
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printf ("\\n");
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break;
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case '\t':
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printf ("\\t");
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break;
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case '\f':
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printf ("\\f");
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break;
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case '\b':
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printf ("\\b");
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break;
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case '\r':
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printf ("\\r");
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break;
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default:
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putchar (c);
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}
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putchar ('\n');
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}
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}
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/* Parse string S as an integer, using decimal radix by default,
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but allowing octal and hex numbers as in C. */
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static int
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integer_arg (s)
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char *s;
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{
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int value;
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int radix = 10;
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char *p = s;
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int c;
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if (*p != '0')
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radix = 10;
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else if (*++p == 'x')
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{
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radix = 16;
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p++;
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}
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else
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radix = 8;
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value = 0;
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while (((c = *p++) >= '0' && c <= '9')
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|| (radix == 16 && (c & ~40) >= 'A' && (c & ~40) <= 'Z'))
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{
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value *= radix;
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if (c >= '0' && c <= '9')
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value += c - '0';
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else
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value += (c & ~40) - 'A';
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}
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if (c == 'b')
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value *= 512;
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else if (c == 'B')
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value *= 1024;
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else
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p--;
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if (*p)
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{
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fprintf (stderr, "%s: invalid integer argument %s\n", program_name, s);
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exit (1);
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}
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return value;
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}
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static void
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usage (stream)
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FILE *stream;
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{
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fprintf (stream, "\
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Usage: %s [-afhov] [-n min-len] [-min-len] [-t {o,x,d}] [-]\n\
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[--all] [--print-file-name] [--bytes=min-len] [--radix={o,x,d}]\n\
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[--help] [--version] file...\n",
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program_name);
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exit (1);
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}
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