gdb/ui-file.c

   1 /* UI_FILE - a generic STDIO like output stream.
   2
   3    Copyright (C) 1999-2018 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Implement the ``struct ui_file'' object.  */
  21
  22 #include "defs.h"
  23 #include "ui-file.h"
  24 #include "gdb_obstack.h"
  25 #include "gdb_select.h"
  26 #include "filestuff.h"
  27
  28 null_file null_stream;
  29
  30 ui_file::ui_file ()
  31 {}
  32
  33 ui_file::~ui_file ()
  34 {}
  35
  36 void
  37 ui_file::printf (const char *format, ...)
  38 {
  39   va_list args;
  40
  41   va_start (args, format);
  42   vfprintf_unfiltered (this, format, args);
  43   va_end (args);
  44 }
  45
  46 void
  47 ui_file::putstr (const char *str, int quoter)
  48 {
  49   fputstr_unfiltered (str, quoter, this);
  50 }
  51
  52 void
  53 ui_file::putstrn (const char *str, int n, int quoter)
  54 {
  55   fputstrn_unfiltered (str, n, quoter, this);
  56 }
  57
  58 int
  59 ui_file::putc (int c)
  60 {
  61   return fputc_unfiltered (c, this);
  62 }
  63
  64 void
  65 ui_file::vprintf (const char *format, va_list args)
  66 {
  67   vfprintf_unfiltered (this, format, args);
  68 }
  69
  70 \f
  71
  72 void
  73 null_file::write (const char *buf, long sizeof_buf)
  74 {
  75   /* Discard the request.  */
  76 }
  77
  78 void
  79 null_file::puts (const char *)
  80 {
  81   /* Discard the request.  */
  82 }
  83
  84 void
  85 null_file::write_async_safe (const char *buf, long sizeof_buf)
  86 {
  87   /* Discard the request.  */
  88 }
  89
  90 \f
  91
  92 void
  93 gdb_flush (struct ui_file *file)
  94 {
  95   file->flush ();
  96 }
  97
  98 int
  99 ui_file_isatty (struct ui_file *file)
 100 {
 101   return file->isatty ();
 102 }
 103
 104 void
 105 ui_file_write (struct ui_file *file,
 106                 const char *buf,
 107                 long length_buf)
 108 {
 109   file->write (buf, length_buf);
 110 }
 111
 112 void
 113 ui_file_write_async_safe (struct ui_file *file,
 114                           const char *buf,
 115                           long length_buf)
 116 {
 117   file->write_async_safe (buf, length_buf);
 118 }
 119
 120 long
 121 ui_file_read (struct ui_file *file, char *buf, long length_buf)
 122 {
 123   return file->read (buf, length_buf);
 124 }
 125
 126 void
 127 fputs_unfiltered (const char *buf, struct ui_file *file)
 128 {
 129   file->puts (buf);
 130 }
 131
 132 \f
 133
 134 string_file::~string_file ()
 135 {}
 136
 137 void
 138 string_file::write (const char *buf, long length_buf)
 139 {
 140   m_string.append (buf, length_buf);
 141 }
 142
 143 \f
 144
 145 stdio_file::stdio_file (FILE *file, bool close_p)
 146 {
 147   set_stream (file);
 148   m_close_p = close_p;
 149 }
 150
 151 stdio_file::stdio_file ()
 152   : m_file (NULL),
 153     m_fd (-1),
 154     m_close_p (false)
 155 {}
 156
 157 stdio_file::~stdio_file ()
 158 {
 159   if (m_close_p)
 160     fclose (m_file);
 161 }
 162
 163 void
 164 stdio_file::set_stream (FILE *file)
 165 {
 166   m_file = file;
 167   m_fd = fileno (file);
 168 }
 169
 170 bool
 171 stdio_file::open (const char *name, const char *mode)
 172 {
 173   /* Close the previous stream, if we own it.  */
 174   if (m_close_p)
 175     {
 176       fclose (m_file);
 177       m_close_p = false;
 178     }
 179
 180   gdb_file_up f = gdb_fopen_cloexec (name, mode);
 181
 182   if (f == NULL)
 183     return false;
 184
 185   set_stream (f.release ());
 186   m_close_p = true;
 187
 188   return true;
 189 }
 190
 191 void
 192 stdio_file::flush ()
 193 {
 194   fflush (m_file);
 195 }
 196
 197 long
 198 stdio_file::read (char *buf, long length_buf)
 199 {
 200   /* Wait until at least one byte of data is available, or we get
 201      interrupted with Control-C.  */
 202   {
 203     fd_set readfds;
 204
 205     FD_ZERO (&readfds);
 206     FD_SET (m_fd, &readfds);
 207     if (interruptible_select (m_fd + 1, &readfds, NULL, NULL, NULL) == -1)
 208       return -1;
 209   }
 210
 211   return ::read (m_fd, buf, length_buf);
 212 }
 213
 214 void
 215 stdio_file::write (const char *buf, long length_buf)
 216 {
 217   /* Calling error crashes when we are called from the exception framework.  */
 218   if (fwrite (buf, length_buf, 1, m_file))
 219     {
 220       /* Nothing.  */
 221     }
 222 }
 223
 224 void
 225 stdio_file::write_async_safe (const char *buf, long length_buf)
 226 {
 227   /* This is written the way it is to avoid a warning from gcc about not using the
 228      result of write (since it can be declared with attribute warn_unused_result).
 229      Alas casting to void doesn't work for this.  */
 230   if (::write (m_fd, buf, length_buf))
 231     {
 232       /* Nothing.  */
 233     }
 234 }
 235
 236 void
 237 stdio_file::puts (const char *linebuffer)
 238 {
 239   /* Calling error crashes when we are called from the exception framework.  */
 240   if (fputs (linebuffer, m_file))
 241     {
 242       /* Nothing.  */
 243     }
 244 }
 245
 246 bool
 247 stdio_file::isatty ()
 248 {
 249   return ::isatty (m_fd);
 250 }
 251
 252 \f
 253
 254 /* This is the implementation of ui_file method 'write' for stderr.
 255    gdb_stdout is flushed before writing to gdb_stderr.  */
 256
 257 void
 258 stderr_file::write (const char *buf, long length_buf)
 259 {
 260   gdb_flush (gdb_stdout);
 261   stdio_file::write (buf, length_buf);
 262 }
 263
 264 /* This is the implementation of ui_file method 'puts' for stderr.
 265    gdb_stdout is flushed before writing to gdb_stderr.  */
 266
 267 void
 268 stderr_file::puts (const char *linebuffer)
 269 {
 270   gdb_flush (gdb_stdout);
 271   stdio_file::puts (linebuffer);
 272 }
 273
 274 stderr_file::stderr_file (FILE *stream)
 275   : stdio_file (stream)
 276 {}
 277
 278 \f
 279
 280 tee_file::tee_file (ui_file *one, bool close_one,
 281                     ui_file *two, bool close_two)
 282   : m_one (one),
 283     m_two (two),
 284     m_close_one (close_one),
 285     m_close_two (close_two)
 286 {}
 287
 288 tee_file::~tee_file ()
 289 {
 290   if (m_close_one)
 291     delete m_one;
 292   if (m_close_two)
 293     delete m_two;
 294 }
 295
 296 void
 297 tee_file::flush ()
 298 {
 299   m_one->flush ();
 300   m_two->flush ();
 301 }
 302
 303 void
 304 tee_file::write (const char *buf, long length_buf)
 305 {
 306   m_one->write (buf, length_buf);
 307   m_two->write (buf, length_buf);
 308 }
 309
 310 void
 311 tee_file::write_async_safe (const char *buf, long length_buf)
 312 {
 313   m_one->write_async_safe (buf, length_buf);
 314   m_two->write_async_safe (buf, length_buf);
 315 }
 316
 317 void
 318 tee_file::puts (const char *linebuffer)
 319 {
 320   m_one->puts (linebuffer);
 321   m_two->puts (linebuffer);
 322 }
 323
 324 bool
 325 tee_file::isatty ()
 326 {
 327   return m_one->isatty ();
 328 }