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832 lines
20 KiB
C
832 lines
20 KiB
C
/* UI_FILE - a generic STDIO like output stream.
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Copyright (C) 1999-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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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 3 of the License, or
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(at your option) 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, see <http://www.gnu.org/licenses/>. */
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/* Implement the ``struct ui_file'' object. */
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#include "defs.h"
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#include "ui-file.h"
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#include "gdb_obstack.h"
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#include "gdb_select.h"
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#include "filestuff.h"
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static ui_file_isatty_ftype null_file_isatty;
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static ui_file_write_ftype null_file_write;
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static ui_file_write_ftype null_file_write_async_safe;
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static ui_file_fputs_ftype null_file_fputs;
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static ui_file_read_ftype null_file_read;
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static ui_file_flush_ftype null_file_flush;
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static ui_file_delete_ftype null_file_delete;
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static ui_file_rewind_ftype null_file_rewind;
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static ui_file_put_ftype null_file_put;
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static ui_file_fseek_ftype null_file_fseek;
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struct ui_file
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{
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int *magic;
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ui_file_flush_ftype *to_flush;
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ui_file_write_ftype *to_write;
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ui_file_write_async_safe_ftype *to_write_async_safe;
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ui_file_fputs_ftype *to_fputs;
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ui_file_read_ftype *to_read;
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ui_file_delete_ftype *to_delete;
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ui_file_isatty_ftype *to_isatty;
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ui_file_rewind_ftype *to_rewind;
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ui_file_put_ftype *to_put;
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ui_file_fseek_ftype *to_fseek;
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void *to_data;
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};
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int ui_file_magic;
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struct ui_file *
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ui_file_new (void)
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{
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struct ui_file *file = xmalloc (sizeof (struct ui_file));
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file->magic = &ui_file_magic;
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set_ui_file_data (file, NULL, null_file_delete);
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set_ui_file_flush (file, null_file_flush);
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set_ui_file_write (file, null_file_write);
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set_ui_file_write_async_safe (file, null_file_write_async_safe);
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set_ui_file_fputs (file, null_file_fputs);
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set_ui_file_read (file, null_file_read);
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set_ui_file_isatty (file, null_file_isatty);
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set_ui_file_rewind (file, null_file_rewind);
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set_ui_file_put (file, null_file_put);
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set_ui_file_fseek (file, null_file_fseek);
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return file;
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}
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void
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ui_file_delete (struct ui_file *file)
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{
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file->to_delete (file);
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xfree (file);
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}
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static int
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null_file_isatty (struct ui_file *file)
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{
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return 0;
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}
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static void
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null_file_rewind (struct ui_file *file)
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{
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return;
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}
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static void
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null_file_put (struct ui_file *file,
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ui_file_put_method_ftype *write,
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void *dest)
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{
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return;
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}
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static void
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null_file_flush (struct ui_file *file)
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{
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return;
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}
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static void
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null_file_write (struct ui_file *file,
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const char *buf,
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long sizeof_buf)
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{
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if (file->to_fputs == null_file_fputs)
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/* Both the write and fputs methods are null. Discard the
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request. */
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return;
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else
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{
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/* The fputs method isn't null, slowly pass the write request
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onto that. FYI, this isn't as bad as it may look - the
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current (as of 1999-11-07) printf_* function calls fputc and
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fputc does exactly the below. By having a write function it
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is possible to clean up that code. */
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int i;
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char b[2];
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b[1] = '\0';
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for (i = 0; i < sizeof_buf; i++)
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{
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b[0] = buf[i];
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file->to_fputs (b, file);
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}
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return;
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}
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}
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static long
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null_file_read (struct ui_file *file,
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char *buf,
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long sizeof_buf)
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{
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errno = EBADF;
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return 0;
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}
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static void
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null_file_fputs (const char *buf, struct ui_file *file)
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{
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if (file->to_write == null_file_write)
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/* Both the write and fputs methods are null. Discard the
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request. */
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return;
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else
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{
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/* The write method was implemented, use that. */
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file->to_write (file, buf, strlen (buf));
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}
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}
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static void
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null_file_write_async_safe (struct ui_file *file,
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const char *buf,
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long sizeof_buf)
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{
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return;
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}
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static void
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null_file_delete (struct ui_file *file)
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{
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return;
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}
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static int
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null_file_fseek (struct ui_file *stream, long offset, int whence)
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{
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errno = EBADF;
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return -1;
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}
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void *
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ui_file_data (struct ui_file *file)
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{
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if (file->magic != &ui_file_magic)
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internal_error (__FILE__, __LINE__,
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_("ui_file_data: bad magic number"));
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return file->to_data;
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}
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void
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gdb_flush (struct ui_file *file)
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{
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file->to_flush (file);
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}
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int
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ui_file_isatty (struct ui_file *file)
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{
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return file->to_isatty (file);
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}
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void
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ui_file_rewind (struct ui_file *file)
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{
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file->to_rewind (file);
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}
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void
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ui_file_put (struct ui_file *file,
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ui_file_put_method_ftype *write,
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void *dest)
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{
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file->to_put (file, write, dest);
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}
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void
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ui_file_write (struct ui_file *file,
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const char *buf,
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long length_buf)
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{
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file->to_write (file, buf, length_buf);
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}
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void
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ui_file_write_for_put (void *data, const char *buffer, long length_buffer)
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{
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ui_file_write (data, buffer, length_buffer);
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}
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void
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ui_file_write_async_safe (struct ui_file *file,
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const char *buf,
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long length_buf)
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{
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file->to_write_async_safe (file, buf, length_buf);
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}
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long
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ui_file_read (struct ui_file *file, char *buf, long length_buf)
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{
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return file->to_read (file, buf, length_buf);
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}
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int
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ui_file_fseek (struct ui_file *file, long offset, int whence)
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{
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return file->to_fseek (file, offset, whence);
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}
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void
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fputs_unfiltered (const char *buf, struct ui_file *file)
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{
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file->to_fputs (buf, file);
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}
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void
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set_ui_file_flush (struct ui_file *file, ui_file_flush_ftype *flush_ptr)
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{
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file->to_flush = flush_ptr;
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}
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void
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set_ui_file_isatty (struct ui_file *file, ui_file_isatty_ftype *isatty_ptr)
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{
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file->to_isatty = isatty_ptr;
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}
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void
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set_ui_file_rewind (struct ui_file *file, ui_file_rewind_ftype *rewind_ptr)
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{
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file->to_rewind = rewind_ptr;
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}
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void
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set_ui_file_put (struct ui_file *file, ui_file_put_ftype *put_ptr)
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{
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file->to_put = put_ptr;
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}
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void
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set_ui_file_write (struct ui_file *file,
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ui_file_write_ftype *write_ptr)
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{
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file->to_write = write_ptr;
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}
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void
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set_ui_file_write_async_safe (struct ui_file *file,
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ui_file_write_async_safe_ftype *write_async_safe_ptr)
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{
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file->to_write_async_safe = write_async_safe_ptr;
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}
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void
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set_ui_file_read (struct ui_file *file, ui_file_read_ftype *read_ptr)
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{
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file->to_read = read_ptr;
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}
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void
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set_ui_file_fputs (struct ui_file *file, ui_file_fputs_ftype *fputs_ptr)
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{
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file->to_fputs = fputs_ptr;
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}
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void
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set_ui_file_fseek (struct ui_file *file, ui_file_fseek_ftype *fseek_ptr)
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{
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file->to_fseek = fseek_ptr;
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}
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void
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set_ui_file_data (struct ui_file *file, void *data,
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ui_file_delete_ftype *delete_ptr)
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{
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file->to_data = data;
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file->to_delete = delete_ptr;
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}
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/* ui_file utility function for converting a ``struct ui_file'' into
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a memory buffer. */
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struct accumulated_ui_file
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{
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char *buffer;
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long length;
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};
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static void
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do_ui_file_xstrdup (void *context, const char *buffer, long length)
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{
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struct accumulated_ui_file *acc = context;
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if (acc->buffer == NULL)
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acc->buffer = xmalloc (length + 1);
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else
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acc->buffer = xrealloc (acc->buffer, acc->length + length + 1);
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memcpy (acc->buffer + acc->length, buffer, length);
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acc->length += length;
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acc->buffer[acc->length] = '\0';
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}
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char *
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ui_file_xstrdup (struct ui_file *file, long *length)
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{
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struct accumulated_ui_file acc;
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acc.buffer = NULL;
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acc.length = 0;
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ui_file_put (file, do_ui_file_xstrdup, &acc);
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if (acc.buffer == NULL)
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acc.buffer = xstrdup ("");
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if (length != NULL)
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*length = acc.length;
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return acc.buffer;
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}
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static void
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do_ui_file_obsavestring (void *context, const char *buffer, long length)
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{
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struct obstack *obstack = (struct obstack *) context;
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obstack_grow (obstack, buffer, length);
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}
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char *
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ui_file_obsavestring (struct ui_file *file, struct obstack *obstack,
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long *length)
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{
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ui_file_put (file, do_ui_file_obsavestring, obstack);
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*length = obstack_object_size (obstack);
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obstack_1grow (obstack, '\0');
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return obstack_finish (obstack);
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}
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/* A pure memory based ``struct ui_file'' that can be used an output
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buffer. The buffers accumulated contents are available via
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ui_file_put(). */
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struct mem_file
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{
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int *magic;
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char *buffer;
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int sizeof_buffer;
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int length_buffer;
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};
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static ui_file_rewind_ftype mem_file_rewind;
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static ui_file_put_ftype mem_file_put;
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static ui_file_write_ftype mem_file_write;
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static ui_file_delete_ftype mem_file_delete;
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static struct ui_file *mem_file_new (void);
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static int mem_file_magic;
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static struct ui_file *
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mem_file_new (void)
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{
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struct mem_file *stream = XNEW (struct mem_file);
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struct ui_file *file = ui_file_new ();
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set_ui_file_data (file, stream, mem_file_delete);
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set_ui_file_rewind (file, mem_file_rewind);
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set_ui_file_put (file, mem_file_put);
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set_ui_file_write (file, mem_file_write);
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stream->magic = &mem_file_magic;
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stream->buffer = NULL;
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stream->sizeof_buffer = 0;
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stream->length_buffer = 0;
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return file;
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}
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static void
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mem_file_delete (struct ui_file *file)
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{
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struct mem_file *stream = ui_file_data (file);
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if (stream->magic != &mem_file_magic)
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internal_error (__FILE__, __LINE__,
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_("mem_file_delete: bad magic number"));
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if (stream->buffer != NULL)
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xfree (stream->buffer);
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xfree (stream);
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}
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struct ui_file *
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mem_fileopen (void)
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{
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return mem_file_new ();
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}
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static void
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mem_file_rewind (struct ui_file *file)
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{
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struct mem_file *stream = ui_file_data (file);
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if (stream->magic != &mem_file_magic)
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internal_error (__FILE__, __LINE__,
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_("mem_file_rewind: bad magic number"));
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stream->length_buffer = 0;
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}
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static void
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mem_file_put (struct ui_file *file,
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ui_file_put_method_ftype *write,
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void *dest)
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{
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struct mem_file *stream = ui_file_data (file);
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if (stream->magic != &mem_file_magic)
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internal_error (__FILE__, __LINE__,
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_("mem_file_put: bad magic number"));
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if (stream->length_buffer > 0)
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write (dest, stream->buffer, stream->length_buffer);
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}
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void
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mem_file_write (struct ui_file *file,
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const char *buffer,
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long length_buffer)
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{
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struct mem_file *stream = ui_file_data (file);
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if (stream->magic != &mem_file_magic)
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internal_error (__FILE__, __LINE__,
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_("mem_file_write: bad magic number"));
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if (stream->buffer == NULL)
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{
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stream->length_buffer = length_buffer;
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stream->sizeof_buffer = length_buffer;
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stream->buffer = xmalloc (stream->sizeof_buffer);
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memcpy (stream->buffer, buffer, length_buffer);
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}
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else
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{
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int new_length = stream->length_buffer + length_buffer;
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if (new_length >= stream->sizeof_buffer)
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{
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stream->sizeof_buffer = new_length;
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stream->buffer = xrealloc (stream->buffer, stream->sizeof_buffer);
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}
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memcpy (stream->buffer + stream->length_buffer, buffer, length_buffer);
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stream->length_buffer = new_length;
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}
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}
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/* ``struct ui_file'' implementation that maps directly onto
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<stdio.h>'s FILE. */
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static ui_file_write_ftype stdio_file_write;
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static ui_file_write_async_safe_ftype stdio_file_write_async_safe;
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static ui_file_fputs_ftype stdio_file_fputs;
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static ui_file_read_ftype stdio_file_read;
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static ui_file_isatty_ftype stdio_file_isatty;
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static ui_file_delete_ftype stdio_file_delete;
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static struct ui_file *stdio_file_new (FILE *file, int close_p);
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static ui_file_flush_ftype stdio_file_flush;
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static ui_file_fseek_ftype stdio_file_fseek;
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static int stdio_file_magic;
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struct stdio_file
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{
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int *magic;
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FILE *file;
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/* The associated file descriptor is extracted ahead of time for
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stdio_file_write_async_safe's benefit, in case fileno isn't async-safe. */
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int fd;
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int close_p;
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};
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static struct ui_file *
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stdio_file_new (FILE *file, int close_p)
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{
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struct ui_file *ui_file = ui_file_new ();
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struct stdio_file *stdio = xmalloc (sizeof (struct stdio_file));
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stdio->magic = &stdio_file_magic;
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stdio->file = file;
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stdio->fd = fileno (file);
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stdio->close_p = close_p;
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set_ui_file_data (ui_file, stdio, stdio_file_delete);
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set_ui_file_flush (ui_file, stdio_file_flush);
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set_ui_file_write (ui_file, stdio_file_write);
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set_ui_file_write_async_safe (ui_file, stdio_file_write_async_safe);
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set_ui_file_fputs (ui_file, stdio_file_fputs);
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set_ui_file_read (ui_file, stdio_file_read);
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set_ui_file_isatty (ui_file, stdio_file_isatty);
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set_ui_file_fseek (ui_file, stdio_file_fseek);
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return ui_file;
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}
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static void
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stdio_file_delete (struct ui_file *file)
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{
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struct stdio_file *stdio = ui_file_data (file);
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if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_delete: bad magic number"));
|
||
if (stdio->close_p)
|
||
{
|
||
fclose (stdio->file);
|
||
}
|
||
xfree (stdio);
|
||
}
|
||
|
||
static void
|
||
stdio_file_flush (struct ui_file *file)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_flush: bad magic number"));
|
||
fflush (stdio->file);
|
||
}
|
||
|
||
static long
|
||
stdio_file_read (struct ui_file *file, char *buf, long length_buf)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_read: bad magic number"));
|
||
|
||
/* For the benefit of Windows, call gdb_select before reading from
|
||
the file. Wait until at least one byte of data is available.
|
||
Control-C can interrupt gdb_select, but not read. */
|
||
{
|
||
fd_set readfds;
|
||
FD_ZERO (&readfds);
|
||
FD_SET (stdio->fd, &readfds);
|
||
if (gdb_select (stdio->fd + 1, &readfds, NULL, NULL, NULL) == -1)
|
||
return -1;
|
||
}
|
||
|
||
return read (stdio->fd, buf, length_buf);
|
||
}
|
||
|
||
static void
|
||
stdio_file_write (struct ui_file *file, const char *buf, long length_buf)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_write: bad magic number"));
|
||
/* Calling error crashes when we are called from the exception framework. */
|
||
if (fwrite (buf, length_buf, 1, stdio->file))
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
}
|
||
|
||
static void
|
||
stdio_file_write_async_safe (struct ui_file *file,
|
||
const char *buf, long length_buf)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
{
|
||
/* gettext isn't necessarily async safe, so we can't use _("error message") here.
|
||
We could extract the correct translation ahead of time, but this is an extremely
|
||
rare event, and one of the other stdio_file_* routines will presumably catch
|
||
the problem anyway. For now keep it simple and ignore the error here. */
|
||
return;
|
||
}
|
||
|
||
/* This is written the way it is to avoid a warning from gcc about not using the
|
||
result of write (since it can be declared with attribute warn_unused_result).
|
||
Alas casting to void doesn't work for this. */
|
||
if (write (stdio->fd, buf, length_buf))
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
}
|
||
|
||
static void
|
||
stdio_file_fputs (const char *linebuffer, struct ui_file *file)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_fputs: bad magic number"));
|
||
/* Calling error crashes when we are called from the exception framework. */
|
||
if (fputs (linebuffer, stdio->file))
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
}
|
||
|
||
static int
|
||
stdio_file_isatty (struct ui_file *file)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_isatty: bad magic number"));
|
||
return (isatty (stdio->fd));
|
||
}
|
||
|
||
static int
|
||
stdio_file_fseek (struct ui_file *file, long offset, int whence)
|
||
{
|
||
struct stdio_file *stdio = ui_file_data (file);
|
||
|
||
if (stdio->magic != &stdio_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("stdio_file_fseek: bad magic number"));
|
||
|
||
return fseek (stdio->file, offset, whence);
|
||
}
|
||
|
||
#ifdef __MINGW32__
|
||
/* This is the implementation of ui_file method to_write for stderr.
|
||
gdb_stdout is flushed before writing to gdb_stderr. */
|
||
|
||
static void
|
||
stderr_file_write (struct ui_file *file, const char *buf, long length_buf)
|
||
{
|
||
gdb_flush (gdb_stdout);
|
||
stdio_file_write (file, buf, length_buf);
|
||
}
|
||
|
||
/* This is the implementation of ui_file method to_fputs for stderr.
|
||
gdb_stdout is flushed before writing to gdb_stderr. */
|
||
|
||
static void
|
||
stderr_file_fputs (const char *linebuffer, struct ui_file *file)
|
||
{
|
||
gdb_flush (gdb_stdout);
|
||
stdio_file_fputs (linebuffer, file);
|
||
}
|
||
#endif
|
||
|
||
struct ui_file *
|
||
stderr_fileopen (void)
|
||
{
|
||
struct ui_file *ui_file = stdio_fileopen (stderr);
|
||
|
||
#ifdef __MINGW32__
|
||
/* There is no real line-buffering on Windows, see
|
||
http://msdn.microsoft.com/en-us/library/86cebhfs%28v=vs.71%29.aspx
|
||
so the stdout is either fully-buffered or non-buffered. We can't
|
||
make stdout non-buffered, because of two concerns,
|
||
1. non-buffering hurts performance,
|
||
2. non-buffering may change GDB's behavior when it is interacting
|
||
with front-end, such as Emacs.
|
||
|
||
We decided to leave stdout as fully buffered, but flush it first
|
||
when something is written to stderr. */
|
||
|
||
/* Method 'to_write_async_safe' is not overwritten, because there's
|
||
no way to flush a stream in an async-safe manner. Fortunately,
|
||
it doesn't really matter, because:
|
||
- that method is only used for printing internal debug output
|
||
from signal handlers.
|
||
- Windows hosts don't have a concept of async-safeness. Signal
|
||
handlers run in a separate thread, so they can call
|
||
the regular non-async-safe output routines freely. */
|
||
set_ui_file_write (ui_file, stderr_file_write);
|
||
set_ui_file_fputs (ui_file, stderr_file_fputs);
|
||
#endif
|
||
|
||
return ui_file;
|
||
}
|
||
|
||
/* Like fdopen(). Create a ui_file from a previously opened FILE. */
|
||
|
||
struct ui_file *
|
||
stdio_fileopen (FILE *file)
|
||
{
|
||
return stdio_file_new (file, 0);
|
||
}
|
||
|
||
struct ui_file *
|
||
gdb_fopen (const char *name, const char *mode)
|
||
{
|
||
FILE *f = gdb_fopen_cloexec (name, mode);
|
||
|
||
if (f == NULL)
|
||
return NULL;
|
||
return stdio_file_new (f, 1);
|
||
}
|
||
|
||
/* ``struct ui_file'' implementation that maps onto two ui-file objects. */
|
||
|
||
static ui_file_write_ftype tee_file_write;
|
||
static ui_file_fputs_ftype tee_file_fputs;
|
||
static ui_file_isatty_ftype tee_file_isatty;
|
||
static ui_file_delete_ftype tee_file_delete;
|
||
static ui_file_flush_ftype tee_file_flush;
|
||
|
||
static int tee_file_magic;
|
||
|
||
struct tee_file
|
||
{
|
||
int *magic;
|
||
struct ui_file *one, *two;
|
||
int close_one, close_two;
|
||
};
|
||
|
||
struct ui_file *
|
||
tee_file_new (struct ui_file *one, int close_one,
|
||
struct ui_file *two, int close_two)
|
||
{
|
||
struct ui_file *ui_file = ui_file_new ();
|
||
struct tee_file *tee = xmalloc (sizeof (struct tee_file));
|
||
|
||
tee->magic = &tee_file_magic;
|
||
tee->one = one;
|
||
tee->two = two;
|
||
tee->close_one = close_one;
|
||
tee->close_two = close_two;
|
||
set_ui_file_data (ui_file, tee, tee_file_delete);
|
||
set_ui_file_flush (ui_file, tee_file_flush);
|
||
set_ui_file_write (ui_file, tee_file_write);
|
||
set_ui_file_fputs (ui_file, tee_file_fputs);
|
||
set_ui_file_isatty (ui_file, tee_file_isatty);
|
||
return ui_file;
|
||
}
|
||
|
||
static void
|
||
tee_file_delete (struct ui_file *file)
|
||
{
|
||
struct tee_file *tee = ui_file_data (file);
|
||
|
||
if (tee->magic != &tee_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("tee_file_delete: bad magic number"));
|
||
if (tee->close_one)
|
||
ui_file_delete (tee->one);
|
||
if (tee->close_two)
|
||
ui_file_delete (tee->two);
|
||
|
||
xfree (tee);
|
||
}
|
||
|
||
static void
|
||
tee_file_flush (struct ui_file *file)
|
||
{
|
||
struct tee_file *tee = ui_file_data (file);
|
||
|
||
if (tee->magic != &tee_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("tee_file_flush: bad magic number"));
|
||
tee->one->to_flush (tee->one);
|
||
tee->two->to_flush (tee->two);
|
||
}
|
||
|
||
static void
|
||
tee_file_write (struct ui_file *file, const char *buf, long length_buf)
|
||
{
|
||
struct tee_file *tee = ui_file_data (file);
|
||
|
||
if (tee->magic != &tee_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("tee_file_write: bad magic number"));
|
||
ui_file_write (tee->one, buf, length_buf);
|
||
ui_file_write (tee->two, buf, length_buf);
|
||
}
|
||
|
||
static void
|
||
tee_file_fputs (const char *linebuffer, struct ui_file *file)
|
||
{
|
||
struct tee_file *tee = ui_file_data (file);
|
||
|
||
if (tee->magic != &tee_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("tee_file_fputs: bad magic number"));
|
||
tee->one->to_fputs (linebuffer, tee->one);
|
||
tee->two->to_fputs (linebuffer, tee->two);
|
||
}
|
||
|
||
static int
|
||
tee_file_isatty (struct ui_file *file)
|
||
{
|
||
struct tee_file *tee = ui_file_data (file);
|
||
|
||
if (tee->magic != &tee_file_magic)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("tee_file_isatty: bad magic number"));
|
||
|
||
return ui_file_isatty (tee->one);
|
||
}
|