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Diffstat (limited to 'binutils-2.25/binutils/strings.c')
| -rw-r--r-- | binutils-2.25/binutils/strings.c | 655 |
1 files changed, 655 insertions, 0 deletions
diff --git a/binutils-2.25/binutils/strings.c b/binutils-2.25/binutils/strings.c new file mode 100644 index 00000000..d5916305 --- /dev/null +++ b/binutils-2.25/binutils/strings.c @@ -0,0 +1,655 @@ +/* strings -- print the strings of printable characters in files + Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, + 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 + Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA + 02110-1301, USA. */ + +/* Usage: strings [options] file... + + Options: + --all + -a + - Do not scan only the initialized data section of object files. + + --print-file-name + -f Print the name of the file before each string. + + --bytes=min-len + -n min-len + -min-len Print graphic char sequences, MIN-LEN or more bytes long, + that are followed by a NUL or a newline. Default is 4. + + --radix={o,x,d} + -t {o,x,d} Print the offset within the file before each string, + in octal/hex/decimal. + + -o Like -to. (Some other implementations have -o like -to, + others like -td. We chose one arbitrarily.) + + --encoding={s,S,b,l,B,L} + -e {s,S,b,l,B,L} + Select character encoding: 7-bit-character, 8-bit-character, + bigendian 16-bit, littleendian 16-bit, bigendian 32-bit, + littleendian 32-bit. + + --target=BFDNAME + -T {bfdname} + Specify a non-default object file format. + + --help + -h Print the usage message on the standard output. + + --version + -V + -v Print the program version number. + + Written by Richard Stallman <rms@gnu.ai.mit.edu> + and David MacKenzie <djm@gnu.ai.mit.edu>. */ + +#include "sysdep.h" +#include "bfd.h" +#include "getopt.h" +#include "libiberty.h" +#include "safe-ctype.h" +#include "bucomm.h" + +#define STRING_ISGRAPHIC(c) \ + ( (c) >= 0 \ + && (c) <= 255 \ + && ((c) == '\t' || ISPRINT (c) || (encoding == 'S' && (c) > 127))) + +#ifndef errno +extern int errno; +#endif + +/* The BFD section flags that identify an initialized data section. */ +#define DATA_FLAGS (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS) + +/* Radix for printing addresses (must be 8, 10 or 16). */ +static int address_radix; + +/* Minimum length of sequence of graphic chars to trigger output. */ +static int string_min; + +/* TRUE means print address within file for each string. */ +static bfd_boolean print_addresses; + +/* TRUE means print filename for each string. */ +static bfd_boolean print_filenames; + +/* TRUE means for object files scan only the data section. */ +static bfd_boolean datasection_only; + +/* TRUE if we found an initialized data section in the current file. */ +static bfd_boolean got_a_section; + +/* The BFD object file format. */ +static char *target; + +/* The character encoding format. */ +static char encoding; +static int encoding_bytes; + +static struct option long_options[] = +{ + {"all", no_argument, NULL, 'a'}, + {"print-file-name", no_argument, NULL, 'f'}, + {"bytes", required_argument, NULL, 'n'}, + {"radix", required_argument, NULL, 't'}, + {"encoding", required_argument, NULL, 'e'}, + {"target", required_argument, NULL, 'T'}, + {"help", no_argument, NULL, 'h'}, + {"version", no_argument, NULL, 'v'}, + {NULL, 0, NULL, 0} +}; + +/* Records the size of a named file so that we + do not repeatedly run bfd_stat() on it. */ + +typedef struct +{ + const char * filename; + bfd_size_type filesize; +} filename_and_size_t; + +static void strings_a_section (bfd *, asection *, void *); +static bfd_boolean strings_object_file (const char *); +static bfd_boolean strings_file (char *file); +static void print_strings (const char *, FILE *, file_ptr, int, int, char *); +static void usage (FILE *, int); +static long get_char (FILE *, file_ptr *, int *, char **); + +int main (int, char **); + +int +main (int argc, char **argv) +{ + int optc; + int exit_status = 0; + bfd_boolean files_given = FALSE; + char *s; + int numeric_opt = 0; + +#if defined (HAVE_SETLOCALE) + setlocale (LC_ALL, ""); +#endif + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + program_name = argv[0]; + xmalloc_set_program_name (program_name); + + expandargv (&argc, &argv); + + string_min = 4; + print_addresses = FALSE; + print_filenames = FALSE; + datasection_only = TRUE; + target = NULL; + encoding = 's'; + + while ((optc = getopt_long (argc, argv, "afhHn:ot:e:T:Vv0123456789", + long_options, (int *) 0)) != EOF) + { + switch (optc) + { + case 'a': + datasection_only = FALSE; + break; + + case 'f': + print_filenames = TRUE; + break; + + case 'H': + case 'h': + usage (stdout, 0); + + case 'n': + string_min = (int) strtoul (optarg, &s, 0); + if (s != NULL && *s != 0) + fatal (_("invalid integer argument %s"), optarg); + break; + + case 'o': + print_addresses = TRUE; + address_radix = 8; + break; + + case 't': + print_addresses = TRUE; + if (optarg[1] != '\0') + usage (stderr, 1); + switch (optarg[0]) + { + case 'o': + address_radix = 8; + break; + + case 'd': + address_radix = 10; + break; + + case 'x': + address_radix = 16; + break; + + default: + usage (stderr, 1); + } + break; + + case 'T': + target = optarg; + break; + + case 'e': + if (optarg[1] != '\0') + usage (stderr, 1); + encoding = optarg[0]; + break; + + case 'V': + case 'v': + print_version ("strings"); + break; + + case '?': + usage (stderr, 1); + + default: + numeric_opt = optind; + break; + } + } + + if (numeric_opt != 0) + { + string_min = (int) strtoul (argv[numeric_opt - 1] + 1, &s, 0); + if (s != NULL && *s != 0) + fatal (_("invalid integer argument %s"), argv[numeric_opt - 1] + 1); + } + if (string_min < 1) + fatal (_("invalid minimum string length %d"), string_min); + + switch (encoding) + { + case 'S': + case 's': + encoding_bytes = 1; + break; + case 'b': + case 'l': + encoding_bytes = 2; + break; + case 'B': + case 'L': + encoding_bytes = 4; + break; + default: + usage (stderr, 1); + } + + bfd_init (); + set_default_bfd_target (); + + if (optind >= argc) + { + datasection_only = FALSE; + SET_BINARY (fileno (stdin)); + print_strings ("{standard input}", stdin, 0, 0, 0, (char *) NULL); + files_given = TRUE; + } + else + { + for (; optind < argc; ++optind) + { + if (strcmp (argv[optind], "-") == 0) + datasection_only = FALSE; + else + { + files_given = TRUE; + exit_status |= strings_file (argv[optind]) == FALSE; + } + } + } + + if (!files_given) + usage (stderr, 1); + + return (exit_status); +} + +/* Scan section SECT of the file ABFD, whose printable name is in + ARG->filename and whose size might be in ARG->filesize. If it + contains initialized data set `got_a_section' and print the + strings in it. + + FIXME: We ought to be able to return error codes/messages for + certain conditions. */ + +static void +strings_a_section (bfd *abfd, asection *sect, void *arg) +{ + filename_and_size_t * filename_and_sizep; + bfd_size_type *filesizep; + bfd_size_type sectsize; + void *mem; + + if ((sect->flags & DATA_FLAGS) != DATA_FLAGS) + return; + + sectsize = bfd_get_section_size (sect); + + if (sectsize <= 0) + return; + + /* Get the size of the file. This might have been cached for us. */ + filename_and_sizep = (filename_and_size_t *) arg; + filesizep = & filename_and_sizep->filesize; + + if (*filesizep == 0) + { + struct stat st; + + if (bfd_stat (abfd, &st)) + return; + + /* Cache the result so that we do not repeatedly stat this file. */ + *filesizep = st.st_size; + } + + /* Compare the size of the section against the size of the file. + If the section is bigger then the file must be corrupt and + we should not try dumping it. */ + if (sectsize >= *filesizep) + return; + + mem = xmalloc (sectsize); + + if (bfd_get_section_contents (abfd, sect, mem, (file_ptr) 0, sectsize)) + { + got_a_section = TRUE; + + print_strings (filename_and_sizep->filename, NULL, sect->filepos, + 0, sectsize, (char *) mem); + } + + free (mem); +} + +/* Scan all of the sections in FILE, and print the strings + in the initialized data section(s). + + Return TRUE if successful, + FALSE if not (such as if FILE is not an object file). */ + +static bfd_boolean +strings_object_file (const char *file) +{ + filename_and_size_t filename_and_size; + bfd *abfd; + + abfd = bfd_openr (file, target); + + if (abfd == NULL) + /* Treat the file as a non-object file. */ + return FALSE; + + /* This call is mainly for its side effect of reading in the sections. + We follow the traditional behavior of `strings' in that we don't + complain if we don't recognize a file to be an object file. */ + if (!bfd_check_format (abfd, bfd_object)) + { + bfd_close (abfd); + return FALSE; + } + + got_a_section = FALSE; + filename_and_size.filename = file; + filename_and_size.filesize = 0; + bfd_map_over_sections (abfd, strings_a_section, & filename_and_size); + + if (!bfd_close (abfd)) + { + bfd_nonfatal (file); + return FALSE; + } + + return got_a_section; +} + +/* Print the strings in FILE. Return TRUE if ok, FALSE if an error occurs. */ + +static bfd_boolean +strings_file (char *file) +{ + struct stat st; + + /* get_file_size does not support non-S_ISREG files. */ + + if (stat (file, &st) < 0) + { + if (errno == ENOENT) + non_fatal (_("'%s': No such file"), file); + else + non_fatal (_("Warning: could not locate '%s'. reason: %s"), + file, strerror (errno)); + return FALSE; + } + + /* If we weren't told to scan the whole file, + try to open it as an object file and only look at + initialized data sections. If that fails, fall back to the + whole file. */ + if (!datasection_only || !strings_object_file (file)) + { + FILE *stream; + + stream = fopen (file, FOPEN_RB); + if (stream == NULL) + { + fprintf (stderr, "%s: ", program_name); + perror (file); + return FALSE; + } + + print_strings (file, stream, (file_ptr) 0, 0, 0, (char *) 0); + + if (fclose (stream) == EOF) + { + fprintf (stderr, "%s: ", program_name); + perror (file); + return FALSE; + } + } + + return TRUE; +} + +/* Read the next character, return EOF if none available. + Assume that STREAM is positioned so that the next byte read + is at address ADDRESS in the file. + + If STREAM is NULL, do not read from it. + The caller can supply a buffer of characters + to be processed before the data in STREAM. + MAGIC is the address of the buffer and + MAGICCOUNT is how many characters are in it. */ + +static long +get_char (FILE *stream, file_ptr *address, int *magiccount, char **magic) +{ + int c, i; + long r = 0; + + for (i = 0; i < encoding_bytes; i++) + { + if (*magiccount) + { + (*magiccount)--; + c = *(*magic)++; + } + else + { + if (stream == NULL) + return EOF; + + /* Only use getc_unlocked if we found a declaration for it. + Otherwise, libc is not thread safe by default, and we + should not use it. */ + +#if defined(HAVE_GETC_UNLOCKED) && HAVE_DECL_GETC_UNLOCKED + c = getc_unlocked (stream); +#else + c = getc (stream); +#endif + if (c == EOF) + return EOF; + } + + (*address)++; + r = (r << 8) | (c & 0xff); + } + + switch (encoding) + { + default: + break; + case 'l': + r = ((r & 0xff) << 8) | ((r & 0xff00) >> 8); + break; + case 'L': + r = (((r & 0xff) << 24) | ((r & 0xff00) << 8) + | ((r & 0xff0000) >> 8) | ((r & 0xff000000) >> 24)); + break; + } + + return r; +} + +/* Find the strings in file FILENAME, read from STREAM. + Assume that STREAM is positioned so that the next byte read + is at address ADDRESS in the file. + Stop reading at address STOP_POINT in the file, if nonzero. + + If STREAM is NULL, do not read from it. + The caller can supply a buffer of characters + to be processed before the data in STREAM. + MAGIC is the address of the buffer and + MAGICCOUNT is how many characters are in it. + Those characters come at address ADDRESS and the data in STREAM follow. */ + +static void +print_strings (const char *filename, FILE *stream, file_ptr address, + int stop_point, int magiccount, char *magic) +{ + char *buf = (char *) xmalloc (sizeof (char) * (string_min + 1)); + + while (1) + { + file_ptr start; + int i; + long c; + + /* See if the next `string_min' chars are all graphic chars. */ + tryline: + if (stop_point && address >= stop_point) + break; + start = address; + for (i = 0; i < string_min; i++) + { + c = get_char (stream, &address, &magiccount, &magic); + if (c == EOF) + { + free (buf); + return; + } + if (! STRING_ISGRAPHIC (c)) + /* Found a non-graphic. Try again starting with next char. */ + goto tryline; + buf[i] = c; + } + + /* We found a run of `string_min' graphic characters. Print up + to the next non-graphic character. */ + + if (print_filenames) + printf ("%s: ", filename); + if (print_addresses) + switch (address_radix) + { + case 8: +#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2) + if (sizeof (start) > sizeof (long)) + { +#ifndef __MSVCRT__ + printf ("%7llo ", (unsigned long long) start); +#else + printf ("%7I64o ", (unsigned long long) start); +#endif + } + else +#elif !BFD_HOST_64BIT_LONG + if (start != (unsigned long) start) + printf ("++%7lo ", (unsigned long) start); + else +#endif + printf ("%7lo ", (unsigned long) start); + break; + + case 10: +#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2) + if (sizeof (start) > sizeof (long)) + { +#ifndef __MSVCRT__ + printf ("%7lld ", (unsigned long long) start); +#else + printf ("%7I64d ", (unsigned long long) start); +#endif + } + else +#elif !BFD_HOST_64BIT_LONG + if (start != (unsigned long) start) + printf ("++%7ld ", (unsigned long) start); + else +#endif + printf ("%7ld ", (long) start); + break; + + case 16: +#if __STDC_VERSION__ >= 199901L || (defined(__GNUC__) && __GNUC__ >= 2) + if (sizeof (start) > sizeof (long)) + { +#ifndef __MSVCRT__ + printf ("%7llx ", (unsigned long long) start); +#else + printf ("%7I64x ", (unsigned long long) start); +#endif + } + else +#elif !BFD_HOST_64BIT_LONG + if (start != (unsigned long) start) + printf ("%lx%8.8lx ", (unsigned long) (start >> 32), + (unsigned long) (start & 0xffffffff)); + else +#endif + printf ("%7lx ", (unsigned long) start); + break; + } + + buf[i] = '\0'; + fputs (buf, stdout); + + while (1) + { + c = get_char (stream, &address, &magiccount, &magic); + if (c == EOF) + break; + if (! STRING_ISGRAPHIC (c)) + break; + putchar (c); + } + + putchar ('\n'); + } + free (buf); +} + +static void +usage (FILE *stream, int status) +{ + fprintf (stream, _("Usage: %s [option(s)] [file(s)]\n"), program_name); + fprintf (stream, _(" Display printable strings in [file(s)] (stdin by default)\n")); + fprintf (stream, _(" The options are:\n\ + -a - --all Scan the entire file, not just the data section\n\ + -f --print-file-name Print the name of the file before each string\n\ + -n --bytes=[number] Locate & print any NUL-terminated sequence of at\n\ + -<number> least [number] characters (default 4).\n\ + -t --radix={o,d,x} Print the location of the string in base 8, 10 or 16\n\ + -o An alias for --radix=o\n\ + -T --target=<BFDNAME> Specify the binary file format\n\ + -e --encoding={s,S,b,l,B,L} Select character size and endianness:\n\ + s = 7-bit, S = 8-bit, {b,l} = 16-bit, {B,L} = 32-bit\n\ + @<file> Read options from <file>\n\ + -h --help Display this information\n\ + -v -V --version Print the program's version number\n")); + list_supported_targets (program_name, stream); + if (REPORT_BUGS_TO[0] && status == 0) + fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO); + exit (status); +} |