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/* Character set conversion support for GDB.

   Copyright (C) 2001, 2003, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   This file is part of GDB.

   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 of the License, 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "charset.h"

#include "gdbcmd.h"

#include "gdb_assert.h"

#include "gdb_obstack.h"

#include "gdb_wait.h"

#include "charset-list.h"

#include "vec.h"

#include "environ.h"

#include <stddef.h>

#include "gdb_string.h"

#include <ctype.h>

/* How GDB's character set support works

   GDB has three global settings:

   - The `current host character set' is the character set GDB should

     use in talking to the user, and which (hopefully) the user's

     terminal knows how to display properly.  Most users should not

     change this.

   - The `current target character set' is the character set the

     program being debugged uses.

   - The `current target wide character set' is the wide character set

     the program being debugged uses, that is, the encoding used for

     wchar_t.

   There are commands to set each of these, and mechanisms for

   choosing reasonable default values.  GDB has a global list of

   character sets that it can use as its host or target character

   sets.

   The header file `charset.h' declares various functions that

   different pieces of GDB need to perform tasks like:

   - printing target strings and characters to the user's terminal

     (mostly target->host conversions),

   - building target-appropriate representations of strings and

     characters the user enters in expressions (mostly host->target

     conversions),

     and so on.

   To avoid excessive code duplication and maintenance efforts,

   GDB simply requires a capable iconv function.  Users on platforms

   without a suitable iconv can use the GNU iconv library.  */

#ifdef PHONY_ICONV

/* Provide a phony iconv that does as little as possible.  Also,

   arrange for there to be a single available character set.  */

#undef GDB_DEFAULT_HOST_CHARSET

#define GDB_DEFAULT_HOST_CHARSET "ISO-8859-1"

#define GDB_DEFAULT_TARGET_CHARSET "ISO-8859-1"

#define GDB_DEFAULT_TARGET_WIDE_CHARSET "ISO-8859-1"

#undef DEFAULT_CHARSET_NAMES

#define DEFAULT_CHARSET_NAMES GDB_DEFAULT_HOST_CHARSET ,

#undef iconv_t

#define iconv_t int

#undef iconv_open

#undef iconv

#undef iconv_close

#undef ICONV_CONST

#define ICONV_CONST const

/* Some systems don't have EILSEQ, so we define it here, but not as

   EINVAL, because callers of `iconv' want to distinguish EINVAL and

   EILSEQ.  This is what iconv.h from libiconv does as well.  Note

   that wchar.h may also define EILSEQ, so this needs to be after we

   include wchar.h, which happens in defs.h through gdb_wchar.h.  */

#ifndef EILSEQ

#define EILSEQ ENOENT

#endif

iconv_t

iconv_open (const char *to, const char *from)

{

  /* We allow conversions from UTF-32BE, wchar_t, and the host charset.

     We allow conversions to wchar_t and the host charset.  */

  if (strcmp (from, "UTF-32BE") && strcmp (from, "wchar_t")

      && strcmp (from, GDB_DEFAULT_HOST_CHARSET))

    return -1;

  if (strcmp (to, "wchar_t") && strcmp (to, GDB_DEFAULT_HOST_CHARSET))

    return -1;

  /* Return 1 if we are converting from UTF-32BE, 0 otherwise.  This is

     used as a flag in calls to iconv.  */

  return !strcmp (from, "UTF-32BE");

}

int

iconv_close (iconv_t arg)

{

  return 0;

}

size_t

iconv (iconv_t utf_flag, const char **inbuf, size_t *inbytesleft,

       char **outbuf, size_t *outbytesleft)

{

  if (utf_flag)

    {

      while (*inbytesleft >= 4)

        {

          size_t j;

          unsigned long c = 0;

          for (j = 0; j < 4; ++j)

            {

              c <<= 8;

              c += (*inbuf)[j] & 0xff;

            }

          if (c >= 256)

            {

              errno = EILSEQ;

              return -1;

            }

          **outbuf = c & 0xff;

          ++*outbuf;

          --*outbytesleft;

          ++*inbuf;

          *inbytesleft -= 4;

        }

      if (*inbytesleft < 4)

        {

          errno = EINVAL;

          return -1;

        }

    }

  else

    {

      /* In all other cases we simply copy input bytes to the

         output.  */

      size_t amt = *inbytesleft;

      if (amt > *outbytesleft)

        amt = *outbytesleft;

      memcpy (*outbuf, *inbuf, amt);

      *inbuf += amt;

      *outbuf += amt;

      *inbytesleft -= amt;

      *outbytesleft -= amt;

    }

  if (*inbytesleft)

    {

      errno = E2BIG;

      return -1;

    }

  /* The number of non-reversible conversions -- but they were all

     reversible.  */

  return 0;

}

#endif

/* The global lists of character sets and translations.  */

#ifndef GDB_DEFAULT_TARGET_CHARSET

#define GDB_DEFAULT_TARGET_CHARSET "ISO-8859-1"

#endif

#ifndef GDB_DEFAULT_TARGET_WIDE_CHARSET

#define GDB_DEFAULT_TARGET_WIDE_CHARSET "UTF-32"

#endif

static const char *auto_host_charset_name = GDB_DEFAULT_HOST_CHARSET;

static const char *host_charset_name = "auto";

static void

show_host_charset_name (struct ui_file *file, int from_tty,

                        struct cmd_list_element *c,

                        const char *value)

{

  if (!strcmp (value, "auto"))

    fprintf_filtered (file,

                      _("The host character set is \"auto; currently %s\".\n"),

                      auto_host_charset_name);

  else

    fprintf_filtered (file, _("The host character set is \"%s\".\n"), value);

}

static const char *target_charset_name = GDB_DEFAULT_TARGET_CHARSET;

static void

show_target_charset_name (struct ui_file *file, int from_tty,

                          struct cmd_list_element *c, const char *value)

{

  fprintf_filtered (file, _("The target character set is \"%s\".\n"),

                    value);

}

static const char *target_wide_charset_name = GDB_DEFAULT_TARGET_WIDE_CHARSET;

static void

show_target_wide_charset_name (struct ui_file *file, int from_tty,

                               struct cmd_list_element *c, const char *value)

{

  fprintf_filtered (file, _("The target wide character set is \"%s\".\n"),

                    value);

}

static const char *default_charset_names[] =

{

  DEFAULT_CHARSET_NAMES

};

static const char **charset_enum;

/* If the target wide character set has big- or little-endian

   variants, these are the corresponding names.  */

static const char *target_wide_charset_be_name;

static const char *target_wide_charset_le_name;

/* A helper function for validate which sets the target wide big- and

   little-endian character set names, if possible.  */

static void

set_be_le_names (void)

{

  int i, len;

  target_wide_charset_le_name = NULL;

  target_wide_charset_be_name = NULL;

  len = strlen (target_wide_charset_name);

  for (i = 0; charset_enum[i]; ++i)

    {

      if (strncmp (target_wide_charset_name, charset_enum[i], len))

        continue;

      if ((charset_enum[i][len] == 'B'

           || charset_enum[i][len] == 'L')

          && charset_enum[i][len + 1] == 'E'

          && charset_enum[i][len + 2] == '\0')

        {

          if (charset_enum[i][len] == 'B')

            target_wide_charset_be_name = charset_enum[i];

          else

            target_wide_charset_le_name = charset_enum[i];

        }

    }

}

/* 'Set charset', 'set host-charset', 'set target-charset', 'set

   target-wide-charset', 'set charset' sfunc's.  */

static void

validate (void)

{

  iconv_t desc;

  const char *host_cset = host_charset ();

  desc = iconv_open (target_wide_charset_name, host_cset);

  if (desc == (iconv_t) -1)

    error ("Cannot convert between character sets `%s' and `%s'",

           target_wide_charset_name, host_cset);

  iconv_close (desc);

  desc = iconv_open (target_charset_name, host_cset);

  if (desc == (iconv_t) -1)

    error ("Cannot convert between character sets `%s' and `%s'",

           target_charset_name, host_cset);

  iconv_close (desc);

  set_be_le_names ();

}

/* This is the sfunc for the 'set charset' command.  */

static void

set_charset_sfunc (char *charset, int from_tty, struct cmd_list_element *c)

{

  /* CAREFUL: set the target charset here as well. */

  target_charset_name = host_charset_name;

  validate ();

}

/* 'set host-charset' command sfunc.  We need a wrapper here because

   the function needs to have a specific signature.  */

static void

set_host_charset_sfunc (char *charset, int from_tty,

                        struct cmd_list_element *c)

{

  validate ();

}

/* Wrapper for the 'set target-charset' command.  */

static void

set_target_charset_sfunc (char *charset, int from_tty,

                          struct cmd_list_element *c)

{

  validate ();

}

/* Wrapper for the 'set target-wide-charset' command.  */

static void

set_target_wide_charset_sfunc (char *charset, int from_tty,

                               struct cmd_list_element *c)

{

  validate ();

}

/* sfunc for the 'show charset' command.  */

static void

show_charset (struct ui_file *file, int from_tty, struct cmd_list_element *c,

              const char *name)

{

  show_host_charset_name (file, from_tty, c, host_charset_name);

  show_target_charset_name (file, from_tty, c, target_charset_name);

  show_target_wide_charset_name (file, from_tty, c, target_wide_charset_name);

}

/* Accessor functions.  */

const char *

host_charset (void)

{

  if (!strcmp (host_charset_name, "auto"))

    return auto_host_charset_name;

  return host_charset_name;

}

const char *

target_charset (void)

{

  return target_charset_name;

}

const char *

target_wide_charset (enum bfd_endian byte_order)

{

  if (byte_order == BFD_ENDIAN_BIG)

    {

      if (target_wide_charset_be_name)

        return target_wide_charset_be_name;

    }

  else

    {

      if (target_wide_charset_le_name)

        return target_wide_charset_le_name;

    }

  return target_wide_charset_name;

}

/* Host character set management.  For the time being, we assume that

   the host character set is some superset of ASCII.  */

char

host_letter_to_control_character (char c)

{

  if (c == '?')

    return 0177;

  return c & 0237;

}

/* Convert a host character, C, to its hex value.  C must already have

   been validated using isxdigit.  */

int

host_hex_value (char c)

{

  if (isdigit (c))

    return c - '0';

  if (c >= 'a' && c <= 'f')

    return 10 + c - 'a';

  gdb_assert (c >= 'A' && c <= 'F');

  return 10 + c - 'A';

}

/* Public character management functions.  */

/* A cleanup function which is run to close an iconv descriptor.  */

static void

cleanup_iconv (void *p)

{

  iconv_t *descp = p;

  iconv_close (*descp);

}

void

convert_between_encodings (const char *from, const char *to,

                           const gdb_byte *bytes, unsigned int num_bytes,

                           int width, struct obstack *output,

                           enum transliterations translit)

{

  iconv_t desc;

  struct cleanup *cleanups;

  size_t inleft;

  char *inp;

  unsigned int space_request;

  /* Often, the host and target charsets will be the same.  */

  if (!strcmp (from, to))

    {

      obstack_grow (output, bytes, num_bytes);

      return;

    }

  desc = iconv_open (to, from);

  if (desc == (iconv_t) -1)

    perror_with_name ("Converting character sets");

  cleanups = make_cleanup (cleanup_iconv, &desc);

  inleft = num_bytes;

  inp = (char *) bytes;

  space_request = num_bytes;

  while (inleft > 0)

    {

      char *outp;

      size_t outleft, r;

      int old_size;

      old_size = obstack_object_size (output);

      obstack_blank (output, space_request);

      outp = obstack_base (output) + old_size;

      outleft = space_request;

      r = iconv (desc, (ICONV_CONST char **) &inp, &inleft, &outp, &outleft);

      /* Now make sure that the object on the obstack only includes

         bytes we have converted.  */

      obstack_blank (output, - (int) outleft);

      if (r == (size_t) -1)

        {

          switch (errno)

            {

            case EILSEQ:

              {

                int i;

                /* Invalid input sequence.  */

                if (translit == translit_none)

                  error (_("Could not convert character to `%s' character set"),

                         to);

                /* We emit escape sequence for the bytes, skip them,

                   and try again.  */

                for (i = 0; i < width; ++i)

                  {

                    char octal[5];

                    sprintf (octal, "\\%.3o", *inp & 0xff);

                    obstack_grow_str (output, octal);

                    ++inp;

                    --inleft;

                  }

              }

              break;

            case E2BIG:

              /* We ran out of space in the output buffer.  Make it

                 bigger next time around.  */

              space_request *= 2;

              break;

            case EINVAL:

              /* Incomplete input sequence.  FIXME: ought to report this

                 to the caller somehow.  */

              inleft = 0;

              break;

            default:

              perror_with_name ("Internal error while converting character sets");

            }

        }

    }

  do_cleanups (cleanups);

}

/* An iterator that returns host wchar_t's from a target string.  */

struct wchar_iterator

{

  /* The underlying iconv descriptor.  */

  iconv_t desc;

  /* The input string.  This is updated as convert characters.  */

  char *input;

  /* The number of bytes remaining in the input.  */

  size_t bytes;

  /* The width of an input character.  */

  size_t width;

  /* The output buffer and its size.  */

  gdb_wchar_t *out;

  size_t out_size;

};

/* Create a new iterator.  */

struct wchar_iterator *

make_wchar_iterator (const gdb_byte *input, size_t bytes, const char *charset,

                     size_t width)

{

  struct wchar_iterator *result;

  iconv_t desc;

  desc = iconv_open (INTERMEDIATE_ENCODING, charset);

  if (desc == (iconv_t) -1)

    perror_with_name ("Converting character sets");

  result = XNEW (struct wchar_iterator);

  result->desc = desc;

  result->input = (char *) input;

  result->bytes = bytes;

  result->width = width;

  result->out = XNEW (gdb_wchar_t);

  result->out_size = 1;

  return result;

}

static void

do_cleanup_iterator (void *p)

{

  struct wchar_iterator *iter = p;

  iconv_close (iter->desc);

  xfree (iter->out);

  xfree (iter);

}

struct cleanup *

make_cleanup_wchar_iterator (struct wchar_iterator *iter)

{

  return make_cleanup (do_cleanup_iterator, iter);

}

int

wchar_iterate (struct wchar_iterator *iter,

               enum wchar_iterate_result *out_result,

               gdb_wchar_t **out_chars,

               const gdb_byte **ptr,

               size_t *len)

{

  size_t out_request;

  /* Try to convert some characters.  At first we try to convert just

     a single character.  The reason for this is that iconv does not

     necessarily update its outgoing arguments when it encounters an

     invalid input sequence -- but we want to reliably report this to

     our caller so it can emit an escape sequence.  */

  out_request = 1;

  while (iter->bytes > 0)

    {

      char *outptr = (char *) &iter->out[0];

      char *orig_inptr = iter->input;

      size_t orig_in = iter->bytes;

      size_t out_avail = out_request * sizeof (gdb_wchar_t);

      size_t num;

      gdb_wchar_t result;

      size_t r = iconv (iter->desc,

                        (ICONV_CONST char **) &iter->input, &iter->bytes,

                        &outptr, &out_avail);

      if (r == (size_t) -1)

        {

          switch (errno)

            {

            case EILSEQ:

              /* Invalid input sequence.  Skip it, and let the caller

                 know about it.  */

              *out_result = wchar_iterate_invalid;

              *ptr = iter->input;

              *len = iter->width;

              iter->input += iter->width;

              iter->bytes -= iter->width;

              return 0;

            case E2BIG:

              /* We ran out of space.  We still might have converted a

                 character; if so, return it.  Otherwise, grow the

                 buffer and try again.  */

              if (out_avail < out_request * sizeof (gdb_wchar_t))

                break;

              ++out_request;

              if (out_request > iter->out_size)

                {

                  iter->out_size = out_request;

                  iter->out = xrealloc (iter->out,

                                        out_request * sizeof (gdb_wchar_t));

                }

              continue;

            case EINVAL:

              /* Incomplete input sequence.  Let the caller know, and

                 arrange for future calls to see EOF.  */

              *out_result = wchar_iterate_incomplete;

              *ptr = iter->input;

              *len = iter->bytes;

              iter->bytes = 0;

              return 0;

            default:

              perror_with_name ("Internal error while converting character sets");

            }

        }

      /* We converted something.  */

      num = out_request - out_avail / sizeof (gdb_wchar_t);

      *out_result = wchar_iterate_ok;

      *out_chars = iter->out;

      *ptr = orig_inptr;

      *len = orig_in - iter->bytes;

      return num;

    }

  /* Really done.  */

  *out_result = wchar_iterate_eof;

  return -1;

}

/* The charset.c module initialization function.  */

extern initialize_file_ftype _initialize_charset; /* -Wmissing-prototype */

typedef char *char_ptr;

DEF_VEC_P (char_ptr);

static VEC (char_ptr) *charsets;

#ifdef PHONY_ICONV

static void

find_charset_names (void)

{

  VEC_safe_push (char_ptr, charsets, GDB_DEFAULT_HOST_CHARSET);

  VEC_safe_push (char_ptr, charsets, NULL);

}

#else /* PHONY_ICONV */

/* Sometimes, libiconv redefines iconvlist as libiconvlist -- but

   provides different symbols in the static and dynamic libraries.

   So, configure may see libiconvlist but not iconvlist.  But, calling

   iconvlist is the right thing to do and will work.  Hence we do a

   check here but unconditionally call iconvlist below.  */

#if defined (HAVE_ICONVLIST) || defined (HAVE_LIBICONVLIST)

/* A helper function that adds some character sets to the vector of

   all character sets.  This is a callback function for iconvlist.  */

static int

add_one (unsigned int count, const char *const *names, void *data)

{

  unsigned int i;

  for (i = 0; i < count; ++i)

    VEC_safe_push (char_ptr, charsets, xstrdup (names[i]));

  return 0;

}

static void

find_charset_names (void)

{

  iconvlist (add_one, NULL);

  VEC_safe_push (char_ptr, charsets, NULL);

}

#else

/* Return non-zero if LINE (output from iconv) should be ignored.

   Older iconv programs (e.g. 2.2.2) include the human readable

   introduction even when stdout is not a tty.  Newer versions omit

   the intro if stdout is not a tty.  */

static int

ignore_line_p (const char *line)

{

  /* This table is used to filter the output.  If this text appears

     anywhere in the line, it is ignored (strstr is used).  */

  static const char * const ignore_lines[] =

    {

      "The following",

      "not necessarily",