libio/obprintf.c

   1 /* Print output of stream to given obstack.
   2    Copyright (C) 1996, 1997, 1999 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 <string.h>
  27 #include <errno.h>
  28 #include <obstack.h>
  29 #include <stdarg.h>
  30
  31
  32 struct _IO_obstack_file
  33 {
  34   struct _IO_FILE_plus file;
  35   struct obstack *obstack;
  36 };
  37
  38
  39 static int
  40 _IO_obstack_overflow (_IO_FILE *fp, int c)
  41 {
  42   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  43
  44   /* Make room for another character.  This might as well allocate a
  45      new chunk a memory and moves the old contents over.  */
  46   if (c != EOF)
  47     obstack_1grow (obstack, c);
  48
  49   /* Setup the buffer pointers again.  */
  50   fp->_IO_write_base = obstack_base (obstack);
  51   fp->_IO_write_ptr = obstack_next_free (obstack);
  52   fp->_IO_write_end = fp->_IO_write_ptr + obstack_room (obstack);
  53   /* Now allocate the rest of the current chunk.  */
  54   obstack_blank_fast (obstack, fp->_IO_write_end - fp->_IO_write_ptr);
  55
  56   return c;
  57 }
  58
  59
  60 static _IO_size_t
  61 _IO_obstack_xsputn (_IO_FILE *fp, const void *data, _IO_size_t n)
  62 {
  63   struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
  64
  65   if (fp->_IO_write_ptr + n > fp->_IO_write_end)
  66     {
  67       /* We need some more memory.  First shrink the buffer to the
  68          space we really currently need.  */
  69       obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
  70
  71       /* Now grow for N bytes, and put the data there.  */
  72       obstack_grow (obstack, data, n);
  73
  74       /* Setup the buffer pointers again.  */
  75       fp->_IO_write_base = obstack_base (obstack);
  76       fp->_IO_write_ptr = obstack_next_free (obstack);
  77       fp->_IO_write_end = (fp->_IO_write_ptr + obstack_room (obstack));
  78       /* Now allocate the rest of the current chunk.  */
  79       obstack_blank_fast (obstack, fp->_IO_write_end - fp->_IO_write_ptr);
  80     }
  81   else
  82     fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
  83
  84   return n;
  85 }
  86
  87
  88 /* the jump table.  */
  89 static struct _IO_jump_t _IO_obstack_jumps =
  90 {
  91   JUMP_INIT_DUMMY,
  92   JUMP_INIT(finish, NULL),
  93   JUMP_INIT(overflow, _IO_obstack_overflow),
  94   JUMP_INIT(underflow, NULL),
  95   JUMP_INIT(uflow, NULL),
  96   JUMP_INIT(pbackfail, NULL),
  97   JUMP_INIT(xsputn, _IO_obstack_xsputn),
  98   JUMP_INIT(xsgetn, NULL),
  99   JUMP_INIT(seekoff, NULL),
 100   JUMP_INIT(seekpos, NULL),
 101   JUMP_INIT(setbuf, NULL),
 102   JUMP_INIT(sync, NULL),
 103   JUMP_INIT(doallocate, NULL),
 104   JUMP_INIT(read, NULL),
 105   JUMP_INIT(write, NULL),
 106   JUMP_INIT(seek, NULL),
 107   JUMP_INIT(close, NULL),
 108   JUMP_INIT(stat, NULL),
 109   JUMP_INIT(showmanyc, NULL),
 110   JUMP_INIT(imbue, NULL)
 111 };
 112
 113
 114 int
 115 _IO_obstack_vprintf (struct obstack *obstack, const char *format, va_list args)
 116 {
 117   struct obstack_FILE
 118     {
 119       struct _IO_obstack_file ofile;
 120 #ifdef _IO_MTSAFE_IO
 121       _IO_lock_t lock;
 122 #endif
 123   } new_f;
 124   int result;
 125
 126 #ifdef _IO_MTSAFE_IO
 127   new_f.ofile.file.file._lock = &new_f.lock;
 128 #endif
 129
 130   _IO_no_init (&new_f.ofile.file.file, 0, -1, NULL, NULL);
 131   _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
 132   _IO_str_init_static (&new_f.ofile.file.file, obstack_base (obstack),
 133                        (obstack_object_size (obstack) +
 134                         obstack_room (obstack)), obstack_next_free (obstack));
 135   /* Now allocate the rest of the current chunk.  */
 136   obstack_blank_fast (obstack,
 137                       (new_f.ofile.file.file._IO_write_end
 138                        - new_f.ofile.file.file._IO_write_ptr));
 139   new_f.ofile.obstack = obstack;
 140
 141   result = _IO_vfprintf (&new_f.ofile.file.file, format, args);
 142
 143   /* Shrink the buffer to the space we really currently need.  */
 144   obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
 145                                 - new_f.ofile.file.file._IO_write_end));
 146
 147   return result;
 148 }
 149 #ifdef weak_alias
 150 weak_alias (_IO_obstack_vprintf, obstack_vprintf)
 151 #endif
 152
 153
 154 int
 155 _IO_obstack_printf (struct obstack *obstack, const char *format, ...)
 156 {
 157   int result;
 158   va_list ap;
 159   va_start (ap, format);
 160   result = _IO_obstack_vprintf (obstack, format, ap);
 161   va_end (ap);
 162   return result;
 163 }
 164 #ifdef weak_alias
 165 weak_alias (_IO_obstack_printf, obstack_printf)
 166 #endif