libio/obprintf.c

   1 /* Print output of stream to given obstack.
   2    Copyright (C) 1996, 1997, 1999, 2000 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 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
  32
  33 struct _IO_obstack_file
  34 {
  35   struct _IO_FILE_plus file;
  36   struct obstack *obstack;
  37 };
  38
  39
  40 static int
  41 _IO_obstack_overflow (_IO_FILE *fp, int c)
  42 {
  43   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  44   int size;
  45
  46   /* Make room for another character.  This might as well allocate a
  47      new chunk a memory and moves the old contents over.  */
  48   assert (c != EOF);
  49   obstack_1grow (obstack, c);
  50
  51   /* Setup the buffer pointers again.  */
  52   fp->_IO_write_base = obstack_base (obstack);
  53   fp->_IO_write_ptr = obstack_next_free (obstack);
  54   size = obstack_room (obstack);
  55   fp->_IO_write_end = fp->_IO_write_ptr + size;
  56   /* Now allocate the rest of the current chunk.  */
  57   obstack_blank_fast (obstack, size);
  58
  59   return c;
  60 }
  61
  62
  63 static _IO_size_t
  64 _IO_obstack_xsputn (_IO_FILE *fp, const void *data, _IO_size_t n)
  65 {
  66   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  67
  68   if (fp->_IO_write_ptr + n > fp->_IO_write_end)
  69     {
  70       int size;
  71
  72       /* We need some more memory.  First shrink the buffer to the
  73          space we really currently need.  */
  74       obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
  75
  76       /* Now grow for N bytes, and put the data there.  */
  77       obstack_grow (obstack, data, n);
  78
  79       /* Setup the buffer pointers again.  */
  80       fp->_IO_write_base = obstack_base (obstack);
  81       fp->_IO_write_ptr = obstack_next_free (obstack);
  82       size = obstack_room (obstack);
  83       fp->_IO_write_end = fp->_IO_write_ptr + size;
  84       /* Now allocate the rest of the current chunk.  */
  85       obstack_blank_fast (obstack, size);
  86     }
  87   else
  88     fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
  89
  90   return n;
  91 }
  92
  93
  94 /* the jump table.  */
  95 static struct _IO_jump_t _IO_obstack_jumps =
  96 {
  97   JUMP_INIT_DUMMY,
  98   JUMP_INIT(finish, NULL),
  99   JUMP_INIT(overflow, _IO_obstack_overflow),
 100   JUMP_INIT(underflow, NULL),
 101   JUMP_INIT(uflow, NULL),
 102   JUMP_INIT(pbackfail, NULL),
 103   JUMP_INIT(xsputn, _IO_obstack_xsputn),
 104   JUMP_INIT(xsgetn, NULL),
 105   JUMP_INIT(seekoff, NULL),
 106   JUMP_INIT(seekpos, NULL),
 107   JUMP_INIT(setbuf, NULL),
 108   JUMP_INIT(sync, NULL),
 109   JUMP_INIT(doallocate, NULL),
 110   JUMP_INIT(read, NULL),
 111   JUMP_INIT(write, NULL),
 112   JUMP_INIT(seek, NULL),
 113   JUMP_INIT(close, NULL),
 114   JUMP_INIT(stat, NULL),
 115   JUMP_INIT(showmanyc, NULL),
 116   JUMP_INIT(imbue, NULL)
 117 };
 118
 119
 120 int
 121 _IO_obstack_vprintf (struct obstack *obstack, const char *format, va_list args)
 122 {
 123   struct obstack_FILE
 124     {
 125       struct _IO_obstack_file ofile;
 126 #ifdef _IO_MTSAFE_IO
 127       _IO_lock_t lock;
 128 #endif
 129   } new_f;
 130   int result;
 131   int size;
 132   int room;
 133
 134 #ifdef _IO_MTSAFE_IO
 135   new_f.ofile.file.file._lock = &new_f.lock;
 136 #endif
 137
 138   _IO_no_init (&new_f.ofile.file.file, 0, -1, NULL, NULL);
 139   _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
 140   room = obstack_room (obstack);
 141   size = obstack_object_size (obstack) + room;
 142   if (size == 0)
 143     {
 144       /* We have to handle the allocation a bit different since the
 145          `_IO_str_init_static' function would handle a size of zero
 146          different from what we expect.  */
 147
 148       /* Get more memory.  */
 149       obstack_make_room (obstack, 64);
 150
 151       /* Recompute how much room we have.  */
 152       room = obstack_room (obstack);
 153       size = room;
 154
 155       assert (size != 0);
 156     }
 157
 158   _IO_str_init_static ((struct _IO_strfile_ *) &new_f.ofile, obstack_base (obstack),
 159                        size, obstack_next_free (obstack));
 160   /* Now allocate the rest of the current chunk.  */
 161   assert (size == (new_f.ofile.file.file._IO_write_end
 162                    - new_f.ofile.file.file._IO_write_base));
 163   assert (new_f.ofile.file.file._IO_write_ptr
 164           == (new_f.ofile.file.file._IO_write_base
 165               + obstack_object_size (obstack)));
 166   obstack_blank_fast (obstack, room);
 167
 168   new_f.ofile.obstack = obstack;
 169
 170   result = _IO_vfprintf ((_IO_FILE *) &new_f.ofile.file, format, args);
 171
 172   /* Shrink the buffer to the space we really currently need.  */
 173   obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
 174                                 - new_f.ofile.file.file._IO_write_end));
 175
 176   return result;
 177 }
 178 #ifdef weak_alias
 179 weak_alias (_IO_obstack_vprintf, obstack_vprintf)
 180 #endif
 181
 182
 183 int
 184 _IO_obstack_printf (struct obstack *obstack, const char *format, ...)
 185 {
 186   int result;
 187   va_list ap;
 188   va_start (ap, format);
 189   result = _IO_obstack_vprintf (obstack, format, ap);
 190   va_end (ap);
 191   return result;
 192 }
 193 #ifdef weak_alias
 194 weak_alias (_IO_obstack_printf, obstack_printf)
 195 #endif