libio/obprintf.c

   1 /* Print output of stream to given obstack.
   2    Copyright (C) 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21
  22 #ifdef __STDC__
  23 #include <stdlib.h>
  24 #endif
  25 #include "libioP.h"
  26 #include <assert.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <obstack.h>
  30 #include <stdarg.h>
  31 #include <stdio_ext.h>
  32
  33
  34 struct _IO_obstack_file
  35 {
  36   struct _IO_FILE_plus file;
  37   struct obstack *obstack;
  38 };
  39
  40
  41 static int
  42 _IO_obstack_overflow (_IO_FILE *fp, int c)
  43 {
  44   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  45   int size;
  46
  47   /* Make room for another character.  This might as well allocate a
  48      new chunk a memory and moves the old contents over.  */
  49   assert (c != EOF);
  50   obstack_1grow (obstack, c);
  51
  52   /* Setup the buffer pointers again.  */
  53   fp->_IO_write_base = obstack_base (obstack);
  54   fp->_IO_write_ptr = obstack_next_free (obstack);
  55   size = obstack_room (obstack);
  56   fp->_IO_write_end = fp->_IO_write_ptr + size;
  57   /* Now allocate the rest of the current chunk.  */
  58   obstack_blank_fast (obstack, size);
  59
  60   return c;
  61 }
  62
  63
  64 static _IO_size_t
  65 _IO_obstack_xsputn (_IO_FILE *fp, const void *data, _IO_size_t n)
  66 {
  67   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  68
  69   if (fp->_IO_write_ptr + n > fp->_IO_write_end)
  70     {
  71       int size;
  72
  73       /* We need some more memory.  First shrink the buffer to the
  74          space we really currently need.  */
  75       obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
  76
  77       /* Now grow for N bytes, and put the data there.  */
  78       obstack_grow (obstack, data, n);
  79
  80       /* Setup the buffer pointers again.  */
  81       fp->_IO_write_base = obstack_base (obstack);
  82       fp->_IO_write_ptr = obstack_next_free (obstack);
  83       size = obstack_room (obstack);
  84       fp->_IO_write_end = fp->_IO_write_ptr + size;
  85       /* Now allocate the rest of the current chunk.  */
  86       obstack_blank_fast (obstack, size);
  87     }
  88   else
  89     fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
  90
  91   return n;
  92 }
  93
  94
  95 /* the jump table.  */
  96 static struct _IO_jump_t _IO_obstack_jumps =
  97 {
  98   JUMP_INIT_DUMMY,
  99   JUMP_INIT(finish, NULL),
 100   JUMP_INIT(overflow, _IO_obstack_overflow),
 101   JUMP_INIT(underflow, NULL),
 102   JUMP_INIT(uflow, NULL),
 103   JUMP_INIT(pbackfail, NULL),
 104   JUMP_INIT(xsputn, _IO_obstack_xsputn),
 105   JUMP_INIT(xsgetn, NULL),
 106   JUMP_INIT(seekoff, NULL),
 107   JUMP_INIT(seekpos, NULL),
 108   JUMP_INIT(setbuf, NULL),
 109   JUMP_INIT(sync, NULL),
 110   JUMP_INIT(doallocate, NULL),
 111   JUMP_INIT(read, NULL),
 112   JUMP_INIT(write, NULL),
 113   JUMP_INIT(seek, NULL),
 114   JUMP_INIT(close, NULL),
 115   JUMP_INIT(stat, NULL),
 116   JUMP_INIT(showmanyc, NULL),
 117   JUMP_INIT(imbue, NULL)
 118 };
 119
 120
 121 int
 122 _IO_obstack_vprintf (struct obstack *obstack, const char *format, va_list args)
 123 {
 124   struct obstack_FILE
 125     {
 126       struct _IO_obstack_file ofile;
 127   } new_f;
 128   int result;
 129   int size;
 130   int room;
 131
 132 #ifdef _IO_MTSAFE_IO
 133   new_f.ofile.file.file._lock = NULL;
 134 #endif
 135
 136   _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);
 137   _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
 138   room = obstack_room (obstack);
 139   size = obstack_object_size (obstack) + room;
 140   if (size == 0)
 141     {
 142       /* We have to handle the allocation a bit different since the
 143          `_IO_str_init_static' function would handle a size of zero
 144          different from what we expect.  */
 145
 146       /* Get more memory.  */
 147       obstack_make_room (obstack, 64);
 148
 149       /* Recompute how much room we have.  */
 150       room = obstack_room (obstack);
 151       size = room;
 152
 153       assert (size != 0);
 154     }
 155
 156   _IO_str_init_static ((struct _IO_strfile_ *) &new_f.ofile,
 157                        obstack_base (obstack),
 158                        size, obstack_next_free (obstack));
 159   /* Now allocate the rest of the current chunk.  */
 160   assert (size == (new_f.ofile.file.file._IO_write_end
 161                    - new_f.ofile.file.file._IO_write_base));
 162   assert (new_f.ofile.file.file._IO_write_ptr
 163           == (new_f.ofile.file.file._IO_write_base
 164               + obstack_object_size (obstack)));
 165   obstack_blank_fast (obstack, room);
 166
 167   new_f.ofile.obstack = obstack;
 168
 169   result = _IO_vfprintf (&new_f.ofile.file.file, format, args);
 170
 171   /* Shrink the buffer to the space we really currently need.  */
 172   obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
 173                                 - new_f.ofile.file.file._IO_write_end));
 174
 175   return result;
 176 }
 177 #ifdef weak_alias
 178 weak_alias (_IO_obstack_vprintf, obstack_vprintf)
 179 #endif
 180
 181
 182 int
 183 _IO_obstack_printf (struct obstack *obstack, const char *format, ...)
 184 {
 185   int result;
 186   va_list ap;
 187   va_start (ap, format);
 188   result = _IO_obstack_vprintf (obstack, format, ap);
 189   va_end (ap);
 190   return result;
 191 }
 192 #ifdef weak_alias
 193 weak_alias (_IO_obstack_printf, obstack_printf)
 194 #endif